WO2020052257A1 - 发光装置 - Google Patents

发光装置 Download PDF

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Publication number
WO2020052257A1
WO2020052257A1 PCT/CN2019/086935 CN2019086935W WO2020052257A1 WO 2020052257 A1 WO2020052257 A1 WO 2020052257A1 CN 2019086935 W CN2019086935 W CN 2019086935W WO 2020052257 A1 WO2020052257 A1 WO 2020052257A1
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WIPO (PCT)
Prior art keywords
light
wavelength conversion
conversion element
emitting device
substrate
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Ceased
Application number
PCT/CN2019/086935
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English (en)
French (fr)
Inventor
陈雨叁
刘莹莹
简帅
许颜正
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YLX Inc
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YLX Inc
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Publication of WO2020052257A1 publication Critical patent/WO2020052257A1/zh
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/02—Structural details or components not essential to laser action
    • H01S5/022—Mountings; Housings
    • H01S5/0225—Out-coupling of light
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/64—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/68—Details of reflectors forming part of the light source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/40—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/02—Structural details or components not essential to laser action
    • H01S5/024—Arrangements for thermal management
    • H01S5/02469—Passive cooling, e.g. where heat is removed by the housing as a whole or by a heat pipe without any active cooling element like a TEC

Definitions

  • the invention relates to the technical field of optics and lighting, and in particular to a light emitting device.
  • the technical problem to be solved by the present invention is to provide a light-emitting device capable of emitting high-brightness light and a manufacturing method thereof in view of the shortcomings of the prior art.
  • a light emitting device includes a transparent light guide element including a first end, a second end opposite to the first end, and a receiving groove connecting the first end and the second end, wherein the size of the first end is smaller than that of the second end. size;
  • the substrate includes a first part connected to the second end and a light source disposed on the first part, and the light source is configured to emit excitation light to the transparent light guide element;
  • the wavelength conversion element is disposed in the receiving groove and is used for generating a laser beam under the excitation of the excitation light;
  • a first reflective layer disposed between the wavelength conversion element and the first portion of the substrate
  • the surface of the transparent light guide element facing away from the receiving groove is provided with a total reflection film, and a filter film is provided between the wavelength conversion element and the transparent light guide element.
  • the light source is located between the receiving groove and the outer surface of the transparent light guide element, and the excitation light emitted by the light source is reflected by the total reflection film and enters the wavelength conversion element.
  • an included angle between the surface of the transparent light guide element facing away from the receiving groove and the substrate is 45 °, and the excitation light emitted by the light source is reflected by the total reflection film and enters the wavelength conversion element perpendicularly.
  • the transparent light guide element has a circular truncated cone shape
  • the receiving groove has a cylindrical shape
  • the wavelength conversion element has a cylindrical shape
  • the shape of the transparent light guiding element is a semicircular mesa.
  • the transparent light guiding element further includes a first surface connecting the first end and the second end and perpendicular to the first portion of the substrate.
  • the receiving groove is opened at The first surface, the wavelength conversion element is semi-cylindrical, and is embedded in the receiving groove;
  • the substrate further includes a second portion perpendicular to the first portion, the second portion is connected to the first surface of the transparent light guide element, and a second reflective layer is provided between the wavelength conversion element and the second portion.
  • the light source is composed of a plurality of lasers, and the plurality of lasers are distributed on a plurality of concentric circles with a center of the second end as a center and a different diameter, and the distance from the wavelength conversion element close to the wavelength conversion element In the direction, the density of multiple lasers gradually decreases.
  • the wavelength conversion element is formed by splicing a plurality of sections of fluorescent ceramics, and the wavelength conversion element includes an orange-light ceramic layer, a yellow-light ceramic layer, and green light in this order from an end near the substrate to an end far from the substrate. Ceramic layer segment.
  • the light source is composed of a plurality of lasers, and the plurality of lasers are distributed on three concentric circles with different diameters at the center of the second end, and the lasers on the different concentric circles are respectively irradiated with green light.
  • the wavelength conversion element is a YAG: Ce fluorescent ceramic, and includes a plurality of layers in which the cerium ion concentration gradually decreases from the end near the substrate to the end far from the substrate.
  • the light source is composed of a plurality of lasers, and the plurality of lasers are distributed on a plurality of concentric circles with a center of the second end as a center and different diameters. On different levels.
  • the light emitting device further includes a scattering layer disposed near the first end of the wavelength conversion element.
  • the present invention provides a light-emitting device.
  • the light-emitting device effectively irradiates the excitation light emitted by each laser in a light source at different positions of a wavelength conversion element, thereby effectively avoiding the problem of a decrease in the efficiency of the wavelength conversion element. Make sure to emit high-intensity light.
  • FIG. 1 is a schematic diagram of an overall structure of a light emitting device according to a first embodiment of the present invention
  • FIG. 2 is a schematic plan view of a substrate according to a first embodiment of the present invention.
  • FIG. 3 is a schematic diagram of an overall structure of a transparent light guide element component according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of an overall structure of a light emitting device according to a second embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a third wavelength conversion element according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a four-wavelength conversion element according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a fifth wavelength conversion element according to an embodiment of the present invention.
  • FIG. 8 is a flowchart of a method for manufacturing a light emitting device according to a sixth embodiment of the present invention.
  • FIG. 9 is a flowchart of a method for manufacturing a light emitting device according to a seventh embodiment of the present invention.
  • FIG. 1 is a schematic diagram of the overall structure of the light-emitting device according to the first embodiment of the present invention
  • FIG. 2 is a schematic plan view of the substrate of the first embodiment of the present invention
  • FIG. 3 is a transparent light guide of the first embodiment of the present invention.
  • the light emitting device includes a light source 101, a transparent light guide element 102, a wavelength conversion element 103, a first reflection layer 104, and a substrate 105.
  • the transparent light guide element 102 includes a first end 1021, a second end 1022 opposite to the first end 1021, and a receiving slot 1023 that communicates the first end 1021 and the second end 1022.
  • the size is smaller than the size of the second end 1022.
  • the transparent light guide element 102 is made of sapphire.
  • the transparent light guide element includes an upper end surface, a lower end surface, and a side surface located between the upper and lower end surfaces and disposed around the upper and lower end surfaces.
  • a middle portion of the transparent light guide element is provided with a receiving cavity.
  • the openings are located at the upper and lower end faces, respectively, wherein the size of the upper end face is smaller than the size of the lower end face.
  • the substrate 105 includes a first portion 1051 connected to the second end 1022 of the transparent light guide element 102.
  • the light source 101 is disposed on the first portion 1051 and is embedded in the substrate 105 by, for example, welding.
  • the light source 101 is located between the receiving groove 1023 and the outer surface 102 a of the transparent light guide element 102, and is configured to emit the excitation light L1 to the transparent light guide element 102.
  • the outer surface 102a refers to the oblique side of the transparent light guide element 102 facing away from the receiving groove 1023.
  • the substrate 105 is a metal substrate, and is preferably a copper substrate.
  • a heat sink 106 is further provided below the substrate 105. The heat generated by the wavelength conversion element 103 and the light source 101 can be diffused through the transparent light guide element 102, the substrate 105, and the heat sink 106.
  • the wavelength conversion element 103 is disposed in the receiving groove 1023, and is configured to generate the received laser light L2 under the excitation of the excitation light L1.
  • the first reflective layer 104 is disposed between the wavelength conversion element 103 and the first portion 1051 of the substrate 105.
  • the first reflection layer 104 is a specular total reflection layer formed of a dielectric film or a metal film, which is plated on the end of the wavelength conversion element 103 near the substrate 105.
  • the first reflection layer may also be It is a diffuse reflection layer made of silica gel and diffuse reflection particles, or glass and diffuse reflection particles form a diffuse reflection layer, but a dielectric film is preferably used as the reflection layer.
  • the role of the first reflection layer 104 is to reflect the light emitted from the wavelength conversion element 103 toward the substrate 105 from the laser light received by the wavelength conversion element 103, and to cause this part of the light to be emitted toward the end of the wavelength conversion element 103 away from the substrate 105.
  • the wavelength conversion element matches the shape of the receiving cavity and is placed in the receiving cavity to convert the incident excitation light into a receiving laser light, which is emitted from the surface of the wavelength converting element on the upper end surface.
  • the outer surface 102a of the transparent light guiding element 102 facing away from the receiving groove 1023 is plated with a total reflection film 1024 for guiding the light emitted from the light source 101 to the transparent light guiding element 102, so that when the light source 101 illuminates the transparent light guiding element 102, The excitation light L1 is totally reflected on the surface of the wavelength conversion element 103.
  • a filter film 1025 is provided between the wavelength conversion element 103 and the transparent light guide element 102. The filter film 1025 can transmit the excitation light L1 and reflect the received laser light L2.
  • the light source 101 is a blue laser
  • the excitation light L1 emitted by the light source 101 is blue light
  • the filter film 1025 is a blue light transmission film, which is used to transmit blue light with an incident angle ⁇ 17 °, and reflect non-blue light and Blue light with an incident angle> 17 °.
  • the angle between the outer surface 102a of the transparent light guide element 102 facing away from the receiving groove 1023 and the substrate 105 is 45 °. In this way, the excitation light L1 emitted from the light source 101 is reflected by the total reflection film 1024.
  • the wavelength conversion element 103 can be incident perpendicularly.
  • the wavelength conversion element 103 is a multi-phase fluorescent ceramic, which has more scattering phases inside, and it is difficult for light to be conducted inside, and the blue light absorption rate is between 85% and 95%.
  • the multi-phase fluorescent ceramic may be YAG: Ce + Al2O3 or LuAG: Ce, preferably YAG: Ce + Al2O3.
  • the transparent light guide element 102 has a circular truncated cone shape
  • the receiving groove 1023 has a cylindrical shape
  • the wavelength conversion element 103 has a cylindrical shape, and is embedded in the receiving groove 1023.
  • the central axis of the wavelength conversion element 103 and the central axis of the receiving groove 1023 are the same as the central axis of the transparent light guide element 102.
  • the height of the transparent light guide element 102 is in a range of 5mm-20mm
  • the diameter of the first end 1021 is in a range of 0.5mm-3mm
  • the diameter of the second end 1022 is in a range of 10mm-40mm.
  • the wavelength conversion element 103 has a diameter in a range of 0.5 mm-3 mm and a height in a range of 5 mm-20 mm.
  • the substrate 105 is disc-shaped and has a diameter in a range of 10 mm to 40 mm.
  • the height of the wavelength conversion element 103 is the same as that of the transparent light guide element 102, the diameter of the wavelength conversion element 103 is the same as the diameter of the first end 1021, and the diameter of the substrate 105 is the same as the diameter of the second end 1022.
  • the cylindrical shape can be used in addition to the cylindrical shape of the wavelength conversion element 103, and can also be designed into other shapes according to actual needs.
  • the wavelength conversion element 103 can also be a square pillar.
  • the transparent light guide element 102 can be a prism shape. .
  • the specific shapes of the wavelength conversion element and the transparent light guide element can be selected according to needs in practical applications.
  • the light source 101 embedded in the substrate 105 is composed of a plurality of lasers, and the plurality of lasers are distributed on a plurality of concentric circles with different diameters around the center of the second end 1022 as a center and surround the periphery of the wavelength conversion element 103. As shown in FIG. 2, multiple lasers are distributed on concentric circles A, B, and C, and three concentric circles are arranged at equal intervals. Among them, the diameter of the concentric circle A is the smallest, and the diameters of the concentric circles B and C are increased sequentially.
  • the number of lasers 1011 arranged on the concentric circle A is 15, the number of lasers 1012 arranged on the concentric circle B is 12, and the number of lasers 1013 arranged on the concentric circle C is eight. That is, the number of lasers on the innermost concentric circle A near the wavelength conversion element 103 is close, the middle concentric circle B is the second, and the number of lasers on the outermost concentric circle C is the least.
  • the setting density of the laser gradually decreases, and it has a gradient distribution.
  • the specific number of laser settings can be selected according to actual needs and is not limited to the number shown in FIG. 2.
  • the above arrangement of the light source 101 mainly solves the problem of blue light transmittance.
  • the laser light emitted by a laser farther from the wavelength conversion element 103 passes through the transparent light guide element 102. Reflects and excites the lower end of the wavelength conversion element 103, and the optical path from the light exit port (the top of the wavelength conversion element 103) is far away.
  • the blue laser light is easily absorbed and converted into the received laser light, so the blue light loss is large.
  • the laser light emitted by a laser closer to the wavelength conversion element 103 excites the upper end of the wavelength conversion element 103 through the reflection of the transparent light guide element 102.
  • the optical path to the light exit here is relatively short, and the blue light loss is small. Based on the above principle, by adjusting the number of lasers on different concentric circles, the amount of blue light in the light finally emitted by the light emitting device can be controlled.
  • the number of lasers in each of the multiple turns can also be set to be the same, that is, non-gradient distribution. According to the above principle, as long as the number of lasers close to the wavelength conversion element 103 is ensured, Enough is enough.
  • the light emitting device of the present invention irradiates the excitation light emitted by each laser in the light source at different positions of the wavelength conversion element, thereby effectively avoiding the problem of the decrease in the efficiency of the wavelength conversion element and ensuring the emission of high brightness light.
  • FIG. 4 is a schematic diagram of the overall structure of the light emitting device according to the second embodiment of the present invention.
  • the light emitting device includes a transparent light guide element 202, a wavelength conversion element 203, a substrate 205 in which the light source 201 is embedded, and a heat sink 206.
  • the substrate 205 also includes a second portion 2052 that is perpendicular to the first portion 2051.
  • the shape of the transparent light guiding element 202 is a semicircular mesa.
  • the transparent light guiding element 202 includes a first end 2021, a second end 2022, a receiving groove 2023 that communicates the first end 2021 and the second end 2022, and a connection between the first end 2021 and The second end 2022 is perpendicular to the first surface 202 b of the first portion 2051 of the substrate 205.
  • the receiving groove 2023 is opened on the first surface 202b.
  • the wavelength conversion element 203 is semi-cylindrical and is embedded in the receiving groove 2023.
  • a filter film 2025 is provided between the wavelength conversion element 203 and the transparent light guide element 202.
  • a first reflection layer 204 is provided between the wavelength conversion element 203 and the first portion 2051 of the substrate 205.
  • the second portion 2052 is connected to the first surface 202b of the transparent light guide element 202, and a second reflective layer 207 is provided between the wavelength conversion element 203 and the second portion 2052.
  • the excitation light emitted from the light source 201 passes through the filter film 2025 and enters the wavelength conversion element 203.
  • the received laser light generated by the wavelength conversion element 203 is reflected at the filter film 2025, the first reflection layer 204, and the second reflection layer 207.
  • the wavelength conversion element body 203 generates laser light that is finally emitted toward the top of the wavelength conversion element 203.
  • the light emitting device of this embodiment has a better heat dissipation effect than the light emitting device of the first embodiment.
  • the wavelength conversion element 203 is in direct contact with the second portion 2052, it is more conducive to the heat dissipation of the wavelength conversion element 203, so that the wavelength conversion element of this embodiment can withstand the irradiation of a light source with a higher power, which is beneficial to improving the brightness of the light emitting device .
  • the above two embodiments are different examples of the overall structure of the light emitting device.
  • the following three embodiments only describe the different structures of the wavelength conversion element one by one, and any one of the following three embodiments can be applied to the above two embodiments.
  • the light emitting device of the embodiment In the light emitting device of the embodiment.
  • FIG. 5 is a schematic structural diagram of a third wavelength conversion element according to an embodiment of the present invention.
  • the wavelength conversion element 103 is formed by splicing a plurality of sections of fluorescent ceramics.
  • the wavelength conversion element 103 includes a green light ceramic layer section 103a, an orange light ceramic layer section 103c, a yellow light ceramic layer section 103b, and an orange light ceramic layer section from the end near the light outlet to the end far from the light outlet. Yellow light ceramic with reddish main wavelength.
  • the height of the ceramic layer segment is not limited, as long as the total height matches the height of the transparent light guide element 102.
  • the light source is composed of multiple lasers, which are distributed on three concentric circles with increasing diameters in sequence.
  • the laser located on the concentric circle with the smallest diameter irradiates the green ceramic layer segment 103a and is located in the middle concentric
  • the laser on the circle irradiates the yellow ceramic layer segment 103b, and the laser on the concentric circle with the largest diameter irradiates the orange ceramic layer segment 103c.
  • Each ceramic layer segment can generate laser light of the corresponding color under the irradiation of blue excitation light.
  • the orange light generated by the orange ceramic layer 103c will not be absorbed by the yellow ceramic layer 103b and the green ceramic layer 103a, the yellow The yellow light generated by the photoceramic layer 103b will not be absorbed by the green ceramic layer 103a. Therefore, by adjusting the distribution of the laser in the light source 101, the number of beams of the excitation light irradiated on different ceramic layers can be controlled to obtain the required The proportion of emitted light is red. The length ratio of the green ceramic layer 103a, the yellow ceramic layer 103b, and the orange ceramic layer 103c can be adjusted according to the required color index of the emitted light.
  • the spectrum of the emitted light can be adjusted.
  • the laser receiving of the wavelength conversion element segment corresponding to the exciting light can be adjusted, so that the laser receiving of different colors
  • the ratio can be adjusted, and the wavelength of the final mixed light can be changed. For example, if all the inner lasers are lit, the blue light component of the last emitted light is more, the inner laser is only half lighted, and the blue light components of the last emitted light are less than when all the lights are lit.
  • the emitted light in the foregoing embodiment is white light, but the light-emitting device of the present invention may also emit light other than white light, such as green light.
  • white light such as green light. Since the transparency and blue light absorption of the wavelength conversion element are related to the density of the fluorescent particles in the wavelength conversion element, in the case of emitting green light, the density of the green fluorescent particles in the wavelength conversion element is high, resulting in low transparency of the wavelength conversion element and blue light absorption. The rate is high and most of the blue light is absorbed, so the emitted light is mainly fluorescent colors.
  • FIG. 6 is a schematic structural diagram of a four-wavelength conversion element according to an embodiment of the present invention.
  • the wavelength conversion element is a YAG: Ce fluorescent ceramic, which includes a plurality of layers in which the concentration of cerium (Ce) ions gradually decreases from the end near the light exit to the end remote from the light exit. . That is, from top to bottom, the upper layer 103a 'having the lowest cerium ion concentration, the lower layer 103c' having the highest cerium ion concentration, and the middle layer 103b 'and the middle layer 103b' provided between the upper layer 103a 'and the lower layer 103c' are sequentially numbered. It can be ⁇ 1, and is not limited to the number of segments shown in FIG. 6.
  • the height of each layer is not limited, and the total height and the height of the transparent light guide element should match. The length ratio of each segment is adjusted according to the product color index requirements.
  • the light source is composed of multiple lasers.
  • the multiple lasers are distributed on multiple concentric circles with different diameters.
  • the number of concentric circles is the same as the number of segments of the wavelength conversion element.
  • the lasers on different concentric circles irradiate the different wavelength conversion elements.
  • the fluorescent ceramic with a lower cerium ion concentration is selected near the light exit because the laser capable of irradiating the layer 103a 'is located closer to the wavelength conversion element and is more dense. When the cerium ion concentration is low, the thermal energy of the fluorescent ceramic is low. It has better stability, less temperature quenching, and less heat generation.
  • the layer 103c 'far from the light exit port is selected to dope fluorescent ceramics with a higher cerium ion concentration because the blue light absorption is stronger when the cerium ion concentration is higher. After the blue laser light reaches the light exit port through a longer optical path, the remaining blue light is relatively low. Since the number of lasers turned on can be adjusted, a wavelength conversion element with adjustable blue light transmittance can be manufactured.
  • FIG. 7 is a schematic structural diagram of a fifth wavelength conversion element according to an embodiment of the present invention.
  • a translucent scattering layer 108 is added to the uppermost layer of the wavelength conversion element 103.
  • the thickness of the scattering layer 108 is less than 1 mm, and the thickness preferably ranges from 0.5 mm to 1 mm.
  • the scattering layer 108 may play a role of uniform light.
  • FIG. 8 is a flowchart of a method for manufacturing a light emitting device according to Embodiment 6 of the present invention. The method includes the following steps:
  • a transparent light guide element is prepared.
  • the transparent light guide element includes a first end, a second end, and a receiving groove connecting the first end and the second end.
  • the size of the first end is smaller than the size of the second end.
  • a wavelength conversion element is prepared, and the shape of the wavelength conversion element is consistent with the shape of the receiving groove.
  • the wavelength conversion element is formed by splicing a plurality of sections of fluorescent ceramic, and the wavelength conversion element includes an orange-light ceramic layer, a yellow-light ceramic layer, and a green-light ceramic layer in order from bottom to top.
  • the wavelength conversion element may be a YAG: Ce fluorescent ceramic.
  • a first reflection layer is provided on one end of the wavelength conversion element near the second end of the transparent light guide element.
  • a filter film is coated on the surface of the wavelength conversion element, or a filter film is coated on the surface of the receiving groove.
  • the filter film is a blue light transmission film, and is used to transmit blue light with an incident angle ⁇ 17 °, and reflect non-blue light and blue light with an incident angle> 17 °.
  • the wavelength conversion element is embedded in the receiving groove of the transparent light guide element.
  • the angle between the surface of the transparent light guide element facing away from the receiving groove and the substrate is 45 °, so that the excitation light emitted by the laser is reflected by the total reflection film and then enters the wavelength conversion element vertically.
  • the transparent light guide element has a circular truncated cone shape, and the wavelength conversion element has a cylindrical shape.
  • the step S101 of preparing the transparent light guide element includes: preparing two semicircular truncated cone shapes; and a step of embedding the wavelength conversion element into the receiving groove of the transparent light guide element.
  • S113 includes: fixing the wavelength conversion element in a receiving groove of one of the two semicircular stage-shaped transparent light guide elements, and then gluing the two semicircular stage-shaped transparent light guide elements to make the two semicircular stage-shaped transparent light guide elements Combined with the wavelength conversion element, it has a circular truncated cone shape.
  • the method for manufacturing a light emitting device further includes: providing a scattering layer on a side of the wavelength conversion element near the first end.
  • step S115 of preparing a substrate may be before step S101 of preparing a transparent light guide element.
  • FIG. 9 is a flowchart of a method for manufacturing a light emitting device according to Embodiment 7 of the present invention. The method includes the following steps:
  • a transparent light guide element is prepared.
  • the transparent light guide element includes a first end, a second end, and a receiving groove connecting the first end and the second end.
  • the size of the first end is smaller than the size of the second end.
  • a wavelength conversion element is prepared, and the shape of the wavelength conversion element is consistent with the receiving groove.
  • the wavelength conversion element is a YAG: Ce fluorescent ceramic, and includes a plurality of layers in which the cerium ion concentration gradually decreases from bottom to top.
  • a first reflection layer is provided at one end of the wavelength conversion element near the second end of the transparent light guide element;
  • a filter film is coated on the surface of the wavelength conversion element, or a filter film is coated on the surface of the receiving groove.
  • the filter film is a blue light transmission film, and is used to transmit blue light with an incident angle ⁇ 17 °, and reflect non-blue light and blue light with an incident angle> 17 °.
  • the wavelength conversion element is embedded in the receiving groove of the transparent light guide element.
  • the transparent light guide element has a semicircular stage shape
  • the wavelength conversion element has a semi-cylindrical shape
  • the substrate includes a first portion connected to the second end of the transparent light guide element and a second portion perpendicular to the first portion.
  • the method for manufacturing a light emitting device further includes: providing a second reflective layer between the second portion and the wavelength conversion element.
  • Step S213 of embedding the wavelength conversion element in the receiving groove of the transparent light guide element includes: using a low refractive index glue to glue the wavelength conversion element into the transparent light guide element.
  • Step S215 of fixing the substrate to the second end of the transparent light guide element includes: gluing the second end of the transparent light guide element to the first portion of the substrate, and gluing the vertical surface of the transparent light guide element to the second portion of the substrate. .
  • the wavelength conversion elements are set in sections, for example: the wavelength conversion elements are green light ceramics, yellow light ceramics, and orange light ceramics from top to bottom, or YAG with gradually increasing cerium ion concentration from top to bottom: Ce fluorescent ceramics can obtain a light beam with a relatively high proportion of red light, and finally obtain white light with high brightness.
  • the heat generated by the laser-excited wavelength conversion element can be quickly diffused through the sapphire transparent light guide element, the metal substrate, and the heat sink, which is beneficial to the heat dissipation of the wavelength conversion element.

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  • Physics & Mathematics (AREA)
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  • General Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
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Abstract

本发明提供一种发光装置，包括：透明导光元件，包括第一端、与第一端相对的第二端、连通第一、第二端的收容槽，第一端的尺寸小于第二端的尺寸；基板，包括与第二端相连的第一部分和设置于第一部分的光源；波长转换元件，设置于收容槽内；第一反射层，设置于波长转换元件和基板的第一部分之间；透明导光元件背离收容槽的外表面设有全反射膜，波长转换元件和透明导光元件之间设有滤光膜。本发明通过使光源中的每个激光器所发出的激发光照射在波长转换元件的不同位置，有效避免了波长转换元件效率下降的问题，确保出射高亮度的光。

Description

发光装置 技术领域
本发明涉及光学、照明技术领域，尤其涉及一种发光装置。
背景技术
近年来，激光光源的应用越来越广泛，以激光为激发光激发荧光材料的发光装置具有转换效率高、无效率骤降、亮度高、体积小以及可控性好等诸多优势。目前，常用的激光照明技术是将激光汇聚成一个高亮度的激光光斑照射荧光材料，使荧光材料受激发而发出的受激光与激发光混合，从而得到白光。但是，在需要高亮度的出射光的情况下，如果提高激光功率，会由于激光光斑的光功率密度过高，导致荧光材料因局部过热而引起效率下降，因此无法提高出射光的亮度。
发明内容
本发明所要解决的技术问题在于针对现有技术的不足，提供一种可以发出高亮度光的发光装置及其制造方法。
本发明所要解决的技术问题是通过如下技术方案实现的：
一种发光装置，包括：透明导光元件，包括第一端、与第一端相对的第二端、以及连通第一端和第二端的收容槽，其中，第一端的尺寸小于第二端的尺寸；
基板，包括与第二端相连的第一部分和设置于第一部分的光源，光源用于向透明导光元件发出激发光；
波长转换元件，设置于收容槽内，用于在激发光的激励下产生受激光；
第一反射层，设置于波长转换元件和基板的第一部分之间；
其中，透明导光元件的背离收容槽的表面设有全反射膜，波长转换元件和透明导光元件之间设有滤光膜。
在本发明的一个实施例中，光源位于收容槽与透明导光元件的外表面之间，光源发出的激发光经过全反射膜的反射后入射波长转换元件。
在本发明的一个实施例中，透明导光元件的背离收容槽的表面与基板之间的夹角为45°，光源发出的激发光经全反射膜反射，垂直入射波长转换元件。
在本发明的一个实施例中，透明导光元件为圆台形，收容槽为圆筒形，波长转换元件为圆柱形，且嵌在收容槽内，波长转换元件的中心轴、收容槽的中心轴与透明导光元件的中心轴相同。
在本发明的一个实施例中，透明导光元件的形状为半圆台形，透明导光元件还包括连接第一端和第二端，且垂直于基板的第一部分的第一表面，收容槽开设于第一表面，波长转换元件为半圆柱形，且嵌在收容槽内；
在本发明的一个实施例中，基板还包括垂直于第一部分的第二部分，第二部分与透明导光元件的第一表面相连，波长转换元件与第二部分之间设有第二反射层。
在本发明的一个实施例中，光源由多个激光器组成，多个激光器分布在多个以第二端的圆心为圆心，直径不同的同心圆上，且从靠近波长转换元件到远离波长转换元件的方向上，多个激光器的密度逐渐减小。
在本发明的一个实施例中，波长转换元件由多段荧光陶瓷拼接而成，波长转换元件自靠近基板的一端向远离基板的一端，依次包括橙光陶瓷层段、黄光陶瓷层段和绿光陶瓷层段。
在本发明的一个实施例中，光源由多个激光器组成，多个激光器分布在三个以第二端的圆心为圆心的，直径不同的同心圆上，不同同心圆上的激光器分别照射在绿光陶瓷层段、黄光陶瓷层段或橙光陶瓷层段上。
在本发明的一个实施例中，波长转换元件为YAG:Ce荧光陶瓷，自靠近基板的一端向远离基板的一端，依次包括铈离子浓度逐渐降低的多个层段。
在本发明的一个实施例中，光源由多个激光器组成，多个激光器分布在多个以第二端的圆心为圆心，直径不同的同心圆上，不同同心圆上的激光器分别照射在波长转换元件的不同层段上。
在本发明的一个实施例中，发光装置还包括设置于波长转换元件的靠近第一端的散射层。
综上所述，本发明提供一种发光装置，该发光装置通过使光源中的每个激光器所发出的激发光照射在波长转换元件的不同位置，从而有效避免了波长转换元件效率下降的问题，确保发出高亮度的光。
下面结合附图和具体实施例，对本发明的技术方案进行详细地说明。
附图说明
图1为本发明实施例一发光装置的整体结构示意图；
图2为本发明实施例一基板俯视结构示意图；
图3为本发明实施例一透明导光元件部件的整体结构示意图；
图4为本发明实施例二发光装置的整体结构示意图；
图5为本发明实施例三波长转换元件结构示意图；
图6为本发明实施例四波长转换元件结构示意图；
图7为本发明实施例五波长转换元件结构示意图；
图8为本发明实施例六的发光装置制造方法的流程图；
图9为本发明实施例七的发光装置制造方法的流程图。
附图标记说明：
101、201-光源；
102、202-透明导光元件；
1021、2021-第一端；
1022、2022-第二端；
102a、202a-外表面；
1023、2023-收容槽；
103、203、103’-波长转换元件；
103a-绿光陶瓷层段；
103b-黄光陶瓷层段；
103c-橙光陶瓷层段；
103a’-上层；
103b’-中层；
103c’-下层；
108、208-散射层；
104、204-第一反射层；
207-第二反射层；
1024、2024-全反射膜；
1025、2025-滤光膜；
1051、2051-第一部分；
2052-第二部分；
202b-第一表面；
105、205-基板；
106、206-散热器；
1011、1012、1013-激光器；
A、B、C-同心圆；
L1-激发光；
L2-受激光。
具体实施方式
实施例一
本发明提供一种高亮度的发光装置，图1为本发明实施例一发光装置的整体结构示意图，图2为本发明实施例一基板俯视结构示意图，图3为本发明实施例一透明导光元件部件的整体结构示意图。如图1至图3所示，发光装置包括光源101、透明导光元件102、波长转换元件103、第一反射层104和基板105。
具体来说，透明导光元件102包括第一端1021、与第一端1021相对的第二端1022、以及连通第一端1021和第二端1022的收容槽 1023，其中，第一端1021的尺寸小于第二端1022的尺寸。本实施例中，透明导光元件102由蓝宝石制成。
换句话说，透明导光元件包括上端面、下端面及位于上端面和下端面之间且围绕上端面和下端面设置的侧面，透明导光元件的中间部位设置有一收容腔，收容腔的两个开口分别位于上端面和下端面，其中，上端面的尺寸小于下端面的尺寸。
基板105包括与透明导光元件102的第二端1022相连的第一部分1051。光源101设置于第一部分1051上，例如通过焊接等方式嵌入到基板105中。光源101位于所述收容槽1023与所述透明导光元件102的外表面102a之间，用于向透明导光元件102发出激发光L1。本实施例中，外表面102a是指透明导光元件102的背离收容槽1023的斜侧面。基板105为金属基板，优选为铜基板。为了方便散热，在基板105的下方还设有散热器106，波长转换元件103和光源101产生的热量可以通过透明导光元件102、基板105及散热器106扩散出去。
波长转换元件103设置于收容槽1023内，用于在激发光L1的激励下产生受激光L2。第一反射层104设置于波长转换元件103和基板105的第一部分1051之间。本实施例中，第一反射层104是在波长转换元件103的靠近基板105的一端镀制的由介质膜或者金属膜形成的镜面全反射层，在其他实施例中，第一反射层也可以是硅胶和漫反射粒子制成的漫反射层，或者是玻璃和漫反射粒子形成漫反射层，但优选的是用介质膜作反射层。第一反射层104的作用，是将波长转换元件103产生的受激光中的，往朝向基板105的方向出射的光反射，使这部分光往波长转换元件103的远离基板105的一端出射。
也就是说，波长转换元件，与收容腔的形状相匹配，置于收容腔内，用于将入射的激发光转换为受激光，受激光从波长转换元件位于上端面的面出射。
透明导光元件102的背离收容槽1023的外表面102a上镀一层全反射膜1024，用于引导光源101发出的光射向透明导光元件102，使得光源101照射透明导光元件102时，激发光L1被全部反射到波长转换元件103的表面上。波长转换元件103和透明导光元件102之间设 有滤光膜1025，滤光膜1025可以透射激发光L1并反射受激光L2。
本实施例中，光源101为蓝色激光器，其发出的激发光L1为蓝色光，滤光膜1025为蓝光透射膜，用于透射入射角度≤17°的蓝色光，反射非蓝色的光和入射角度＞17°的蓝色光。为了达到更好的效果，透明导光元件102的背离该收容槽1023的外表面102a与基板105之间的夹角为45°，这样，光源101发出的激发光L1经全反射膜1024反射，能够垂直入射波长转换元件103。
波长转换元件103为复相荧光陶瓷，其内部具有较多的散射相，光线很难在其内部进行传导，蓝光吸收率在85％-95％之间。复相荧光陶瓷可以是YAG:Ce+Al2O3或LuAG:Ce，优选是YAG:Ce+Al2O3。
本实施例中，透明导光元件102为圆台形，收容槽1023为圆筒形，波长转换元件103为圆柱形，且嵌在收容槽1023内。波长转换元件103的中心轴、收容槽1023的中心轴与透明导光元件102的中心轴相同。
圆柱形具体地，透明导光元件102的高度在5mm-20mm的范围内，第一端1021的直径在0.5mm-3mm的范围内，第二端1022的直径在10mm-40mm的范围内。波长转换元件103的直径在0.5mm-3mm的范围内，高度在5mm-20mm的范围内。基板105为圆盘形，且直径在10mm-40mm的范围内。波长转换元件103的高度与透明导光元件102的高度相同，波长转换元件103的直径与第一端1021的直径相同，基板105的直径与第二端1022的直径相同。
圆柱形可以理解，波长转换元件103除了可以采用的圆柱形，也可以根据实际需要设计成其他形状，例如，波长转换元件103还可以为方柱，则此时透明导光元件102可以是棱台形。只要能满足激发光以大致垂直的角度入射波长转换元件的要求，波长转换元件和透明导光元件的具体形状，在实际应用中可以根据需要进行选择。
嵌设在基板105中的光源101由多个激光器组成，该多个激光器分布在若干个以第二端1022的圆心为圆心，直径不同的同心圆上，环绕在波长转换元件103的外周。如图2所示，多个激光器分布在同心圆A、B和C上，三个同心圆等间距设置。其中，同心圆A的直径最小，同心圆B和同心圆C的直径依次增大。设置在同心圆A上的激光器1011 的数量为15个，设置在同心圆B上的激光器1012的数量为12个，而设置在同心圆C上的激光器1013的数量则为8个。也就是说，靠近波长转换元件103的最内侧的同心圆A上的激光器设置数量紧密，中间的同心圆B次之，最外面的同心圆C一圈上的激光器设置数量最少。显然，从靠近波长转换元件103到远离波长转换元件103的方向上，激光器的设置密度逐渐减小，呈梯度分布。在实际应用中，激光器的具体设置数量可以根据实际需要进行选择，并不受限于图2中所示的数量。
光源101的上述设置方式主要解决的是蓝光透过率的问题，具体来说，结合图1和图2，距离波长转换元件103较远的激光器所发射出的激光，通过透明导光元件102的反射，激发波长转换元件103的下端，此处到出光口(波长转换元件103的顶部)的光程较远，蓝激光易被吸收转换为受激光，因此蓝光损失较多。而距离波长转换元件103较近的激光器所发射出的激光，通过透明导光元件102的反射，激发波长转换元件103的上端，此处到出光口的光程较近，蓝光损失较少。基于上述原理，通过调整不同同心圆上的激光器的个数，就可以控制发光装置最终出射的光中的蓝光的量。
可以理解，除上述的激光器设置方式外，也可以设置成多圈中的每一圈的激光器数量相同，即：非梯度分布，根据上述原理，只要保证距离波长转换元件103较近的激光器的数量足够多即可。
本发明的发光装置通过使光源中的每个激光器所发出的激发光照射在波长转换元件的不同位置，从而有效避免了波长转换元件效率下降的问题，确保发出高亮度的光。
实施例二
图4为本发明实施例二发光装置的整体结构示意图。在本实施例中，发光装置包括透明导光元件202、波长转换元件203、嵌设有光源201的基板205和散热器206。
基板205除了包括第一部分2051之外，还包括垂直于该第一部分2051的第二部分2052。透明导光元件202的形状为半圆台形，该透明 导光元件202包括第一端2021、第二端2022、连通第一端2021和第二端2022的收容槽2023，以及连接第一端2021和第二端2022，且垂直于基板205的第一部分2051的第一表面202b。收容槽2023开设于该第一表面202b，波长转换元件203为半圆柱形，且嵌在收容槽2023内。
波长转换元件203和透明导光元件202之间设有滤光膜2025。波长转换元件203和基板205的第一部分2051之间设有第一反射层204。第二部分2052与透明导光元件202的第一表面202b相连，波长转换元件203与第二部分2052之间设有第二反射层207。
光源201发出的激发光透过滤光膜2025入射波长转换元件203，波长转换元件203产生的受激光在滤光膜2025、第一反射层204和第二反射层207处发生反射，这样，可以使波长转换元件体203产生受激光最终往波长转换元件203的顶部出射。
由于基板205的第一部分2051和第二部分2052都可以散热，本实施例的发光装置具有比实施例一的发光装置更好的散热效果。而且，由于波长转换元件203与第二部分2052直接接触，更有利于波长转换元件203的散热，使得本实施例的波长转换元件能够承受更大功率的光源的照射，有利于提高发光装置的亮度。
以上两个实施例为发光装置的整体结构的不同实例，以下三个实施例仅对波长转换元件的不同结构逐一进行说明，且以下三个实施例中的任何一个实施例均可以应用在上述两个实施例的发光装置中。
实施例三
图5为本发明实施例三波长转换元件结构示意图。如图5所示，在本实施例中，波长转换元件103由多段荧光陶瓷拼接而成。该波长转换元件103自靠近出光口的一端向远离出光口的一端，依次包括绿光陶瓷层段103a橙光陶瓷层段103c、黄光陶瓷层段103b和，其中的橙光陶瓷层段也可以采用主波长偏红的黄光陶瓷。陶瓷层段的高度不限，只要总高度与透明导光元件102的高度相吻合即可。
本实施例中，光源由多个激光器组成，该多个激光器分布在直径 依次增大的三个同心圆上，位于直径最小的同心圆上的激光器照射绿光陶瓷层段103a，位于中间的同心圆上的激光器照射黄光陶瓷层段103b，位于直径最大的同心圆上的激光器照射橙光陶瓷层段103c。各陶瓷层段在蓝色激发光的照射下可以产生对应颜色的受激光，由于橙光陶瓷层段103c产生的橙光不会被黄光陶瓷层段103b和绿光陶瓷层段103a吸收，黄光陶瓷层段103b产生的黄光不会被绿光陶瓷层段103a吸收，因此可通过调整光源101中激光器的分布来控制照射在不同陶瓷层段上的激发光的光束数量，从而得到所需的红光占比的出射光。绿光陶瓷层段103a、黄光陶瓷层段103b和橙光陶瓷层段103c的长度比例，可以依照所需的出射光的颜色指标要求调整。
由于波长转换元件分段设计，配合多个激光器的分布，容易获得红光占比较高的出射光，实现高亮度的白光照明。
同时，通过调整照射在不同颜色的陶瓷层段上的光束，可以调整出射光的光谱。具体地，通过控制某一圈激光器的功率，或者控制点亮的激光器的个数，从而调整激发光功率，可以调整该激发光对应的波长转换元件段的受激光，使得不同颜色的受激光的比例可以调整，最终混合光的波长可以改变。例如，内圈激光器全部点亮，则最后出射光的蓝光成分比较多，内圈激光器只点亮一半，最后出射光的蓝光成分比全部点亮时要少。
可以理解，上述实施例的出射光为白光，但本发明的发光装置也可以出射白光以外的光，例如出射绿光。由于波长转换元件的透明度和蓝光吸收率与波长转换元件中的荧光颗粒密度有关，在出射绿光的情况下，波长转换元件中的绿色荧光颗粒密度很高，导致波长转换元件透明度低，蓝光吸收率高，蓝光大部分被吸收了，所以出射的光主要是荧光的颜色。
实施例四
图6为本发明实施例四波长转换元件结构示意图。如图6所示，在本实施例中，波长转换元件为YAG:Ce荧光陶瓷，自靠近出光口的一 端向远离出光口的一端，依次包括铈(Ce)离子浓度逐渐降低的多个层段。也就是说，从上至下依次为铈离子浓度最低的上层103a’、铈离子浓度最高的下层103c’以及设置于上层103a’和和下层103c’之间的中层103b’，中层103b’的段数可以≥1，不仅限于图6中所示的段数。各层段的高度不限，总高度和透明导光元件的高度相吻合即可。各段的长度比例，依照产品颜色指标要求调整。
光源由多个激光器组成，该多个激光器分布在多个直径不同的同心圆上，同心圆的个数与波长转换元件的段数相同，不同同心圆上的激光器分别照射在该波长转换元件的不同层段上。靠近出光口处选择铈离子浓度较低的荧光陶瓷，是由于能够照射到层段103a’的激光器是处于距离波长转换元件较近的地方且比较密集，铈离子浓度较低时，荧光陶瓷的热稳定性较好，温度猝灭也较少，产生的热量较少。远离出光口的层段103c’选择掺杂铈离子浓度较高的荧光陶瓷，是因为铈离子浓度较高时对蓝光的吸收较强，蓝激光通过较长的光程到达出光口后剩余蓝光较少，因此通过调整开启的激光器的个数，可制成蓝光透过率可调的波长转换元件。
实施例五
图7为本发明实施例五波长转换元件结构示意图。如图7所示，本实施例是在波长转换元件103最上层增加了半透明的散射层108。通常情况下，该散射层108的厚度小于1mm，优选厚度范围是0.5mm-1mm。散射层108可以起到均光的作用。
实施例六
本发明还提供一种发光装置的制造方法，图8为本发明实施例六的发光装置制造方法的流程图，该方法包括如下步骤：
S101，制备透明导光元件，其中，透明导光元件包括第一端、第二端以及连通第一端和第二端的收容槽，第一端的尺寸小于第二端的尺寸。
S103，在透明导光元件的背离该收容槽的表面上镀全反射膜。
S105，制备波长转换元件，该波长转换元件的形状与收容槽的形状一致。本实施例中，波长转换元件由多段荧光陶瓷拼接而成，该波长转换元件自下而上依次包括橙光陶瓷层段、黄光陶瓷层段和绿光陶瓷层段。在其他实施例中，波长转换元件也可以为YAG:Ce荧光陶瓷。
S107，在波长转换元件的靠近透明导光元件的第二端的一端设置第一反射层。
S109，在波长转换元件的表面镀滤光膜，或者在收容槽的表面镀滤光膜。其中，滤光膜为蓝光透射膜，用于透射入射角度≤17°的蓝色光，反射非蓝色的光和入射角度＞17°的蓝色光。
S111，将波长转换元件嵌入透明导光元件的收容槽中。
S113，制备设有多个激光器的基板，其中，多个激光器分布在多个以该第二端的圆心为圆心，直径不同的同心圆上，使得不同同心圆上的激光器分别照射在该波长转换元件的不同层段上。
S115，将基板固定于该透明导光元件的第二端。
本实施例中，透明导光元件的背离收容槽的表面与基板之间的夹角为45°，使得激光器发出的激发光经全反射膜反射后，垂直入射波长转换元件。
透明导光元件为圆台形，波长转换元件为圆柱形，为了方便镀膜，制备透明导光元件的步骤S101包括：制备两个半圆台形状；将波长转换元件嵌入透明导光元件的收容槽的步骤S113包括：将波长转换元件固定于两个半圆台形状的透明导光元件之一的收容槽中，然后胶合两个半圆台形状的透明导光元件，使两个半圆台形状的透明导光元件与波长转换元件合并呈圆台形。
在一个实施例中，发光装置的制造方法还包括：在波长转换元件靠近第一端的一面设置散射层。
可以理解，上述步骤的顺序不唯一，例如制备基板的步骤S115可以在制备透明导光元件的步骤S101之前。
实施例七
图9为本发明实施例七的发光装置制造方法的流程图，该方法包括如下步骤：
S201，制备透明导光元件，其中，透明导光元件包括第一端、第二端以及连通第一端和第二端的收容槽，第一端的尺寸小于第二端的尺寸。
S203，在透明导光元件的背离收容槽的表面上镀全反射膜；
S205，制备波长转换元件，波长转换元件的形状与收容槽一致。在本实施例中，波长转换元件为YAG:Ce荧光陶瓷，自下而上依次包括铈离子浓度逐渐降低的多个层段。
S207，在波长转换元件的靠近透明导光元件的第二端的一端设置第一反射层；
S209，在波长转换元件的表面镀滤光膜，或者在收容槽的表面镀滤光膜。其中，滤光膜为蓝光透射膜，用于透射入射角度≤17°的蓝色光，反射非蓝色的光和入射角度＞17°的蓝色光。
S211，将波长转换元件嵌入透明导光元件的收容槽中。
S213，制备设有多个激光器的基板，其中，多个激光器分布在多个以该第二端的圆心为圆心，直径不同的同心圆上，使得不同同心圆上的激光器分别照射在该波长转换元件的不同层段上。
S215，将基板固定于该透明导光元件的第二端。
在本实施例中，透明导光元件为半圆台形状，波长转换元件为半圆柱形，基板包括与透明导光元件的第二端相连的第一部分和垂直于第一部分的第二部分。发光装置制造方法还包括：在第二部分和波长转换元件之间设置第二反射层。
将波长转换元件嵌入透明导光元件的收容槽的步骤S213包括：利用低折射率胶水，将波长转换元件胶合到透明导光元件中。
将基板固定于该透明导光元件的第二端的步骤S215包括：将透明导光元件的第二端胶合于基板的第一部分，将透明导光元件的竖直面胶合于基板的第二部分。。
本发明提供的发光装置及其制造方法具有如下有益效果：
(1)不同的激光器分别照射波长转换元件的不同位置，有效地避免了激光光功率密度过高引起的波长转换元件效率下降。
(2)波长转换元件分段设置，比如：波长转换元件从上至下分别为绿光陶瓷、黄光陶瓷、和橙光陶瓷，或者从上至下分别为铈离子浓度逐渐升高的YAG:Ce荧光陶瓷，能得到红光占比较高的光束，最后得到亮度较高的白光。
(3)光源的多个激光器可分别控制，配合多段式波长转换元件使用，可实现不同波长光的转换。
(4)激光激发波长转换元件产生的热量可通过蓝宝石的透明导光元件、金属基板以及散热器快速扩散出去，有利于波长转换元件的散热。
以上所述仅为本发明的实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (11)

  1. 一种发光装置，其特征在于，包括：透明导光元件，包括第一端、与所述第一端相对的第二端、以及连通所述第一端和所述第二端的收容槽，其中，所述第一端的尺寸小于所述第二端的尺寸；
    基板，包括与所述第二端相连的第一部分和设置于所述第一部分的光源，所述光源用于向所述透明导光元件发出激发光；
    波长转换元件，设置于所述收容槽内，用于在所述激发光的激励下产生受激光；
    第一反射层，设置于所述波长转换元件和所述基板的第一部分之间；
    其中，所述透明导光元件的背离所述收容槽的外表面设有全反射膜，所述波长转换元件和所述透明导光元件之间设有滤光膜。
  2. 如权利要求1所述的发光装置，其特征在于，所述光源位于所述收容槽与所述透明导光元件的外表面之间，所述光源发出的激发光经过所述全反射膜的反射后入射所述波长转换元件。
  3. 如权利要求2所述的发光装置，其特征在于，所述透明导光元件的背离所述收容槽的外表面与所述基板之间的夹角为45°，所述光源发出的激发光经所述全反射膜反射，垂直入射所述波长转换元件。
  4. 如权利要求3所述的发光装置，其特征在于，所述透明导光元件为圆台形，所述收容槽为圆筒形，所述波长转换元件为圆柱形，且嵌在所述收容槽内，所述波长转换元件的中心轴、所述收容槽的中心轴与所述透明导光元件的中心轴相同。
  5. 如权利要求3所述的发光装置，其特征在于，所述透明导光元件的形状为半圆台形，所述透明导光元件还包括连接所述第一端和所述第二端，且垂直于所述基板的第一部分的第一表面，所述收容槽开设于所述第一表面，所述波长转换元件为半圆柱形，且嵌在所述收容 槽内；
    所述基板还包括垂直于所述第一部分的第二部分，所述第二部分与所述透明导光元件的第一表面相连，所述波长转换元件与所述第二部分之间设有第二反射层。
  6. 如权利要求2所述的发光装置，其特征在于，所述光源由多个激光器组成，所述多个激光器分布在多个以所述第二端的圆心为圆心，直径不同的同心圆上，且从靠近所述波长转换元件到远离所述波长转换元件的方向上，所述多个激光器的密度逐渐减小。
  7. 如权利要求2所述的发光装置，其特征在于，所述波长转换元件由多段荧光陶瓷拼接而成，所述波长转换元件自靠近所述基板的一端向远离所述基板的一端，依次包括橙光陶瓷层段、黄光陶瓷层段(103b)和绿光陶瓷层段。
  8. 如权利要求7所述的发光装置，其特征在于，所述光源由多个激光器组成，所述多个激光器分布在三个以所述第二端的圆心为圆心的，直径不同的同心圆上，不同同心圆上的激光器分别照射在所述绿光陶瓷层段、黄光陶瓷层段或橙光陶瓷层段上。
  9. 如权利要求2所述的发光装置，其特征在于，所述波长转换元件为YAG:Ce荧光陶瓷，自靠近所述基板的一端向远离所述基板的一端，依次包括铈离子浓度逐渐降低的多个层段。
  10. 如权利要求9所述的发光装置，其特征在于，所述光源由多个激光器组成，所述多个激光器分布在多个以所述第二端的圆心为圆心，直径不同的同心圆上，不同同心圆上的激光器分别照射在所述波长转换元件的不同层段上。
  11. 如权利要求1所述的发光装置，其特征在于，还包括设置于 所述波长转换元件的靠近所述第一端的散射层。
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