WO2011109975A1 - 白光led照明装置 - Google Patents

白光led照明装置 Download PDF

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Publication number
WO2011109975A1
WO2011109975A1 PCT/CN2010/075081 CN2010075081W WO2011109975A1 WO 2011109975 A1 WO2011109975 A1 WO 2011109975A1 CN 2010075081 W CN2010075081 W CN 2010075081W WO 2011109975 A1 WO2011109975 A1 WO 2011109975A1
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Prior art keywords
luminescent material
lighting device
blue
led lighting
white led
Prior art date
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Ceased
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PCT/CN2010/075081
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English (en)
French (fr)
Inventor
张明
赵昆
李东明
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Sichuan Sunfor Light Co Ltd
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Sichuan Sunfor Light Co Ltd
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Priority to AU2010348288A priority Critical patent/AU2010348288B2/en
Priority to JP2012557372A priority patent/JP5833582B2/ja
Priority to CA2792186A priority patent/CA2792186C/en
Priority to US13/583,428 priority patent/US8710519B2/en
Priority to KR1020147023283A priority patent/KR20140112568A/ko
Priority to RU2012142235/04A priority patent/RU2524690C2/ru
Priority to EP10847233.3A priority patent/EP2546895B1/en
Priority to BR112012022903A priority patent/BR112012022903A2/pt
Priority to ES10847233.3T priority patent/ES2605360T3/es
Priority to SG2012066502A priority patent/SG183964A1/en
Application filed by Sichuan Sunfor Light Co Ltd filed Critical Sichuan Sunfor Light Co Ltd
Priority to KR1020127023829A priority patent/KR20120123552A/ko
Priority to CN2010800653559A priority patent/CN102870240A/zh
Publication of WO2011109975A1 publication Critical patent/WO2011109975A1/zh
Priority to ZA2012/06539A priority patent/ZA201206539B/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/851—Wavelength conversion means
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    • C09K11/00—Luminescent materials, e.g. electroluminescent or chemiluminescent
    • C09K11/08—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials
    • C09K11/77—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals
    • C09K11/7783—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals one of which being europium
    • C09K11/7792—Aluminates
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    • C09K11/00—Luminescent materials, e.g. electroluminescent or chemiluminescent
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    • C09K11/58—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing copper, silver or gold
    • C09K11/582—Chalcogenides
    • C09K11/586—Chalcogenides with alkaline earth metals
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    • C09K11/00—Luminescent materials, e.g. electroluminescent or chemiluminescent
    • C09K11/08—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials
    • C09K11/74—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing arsenic, antimony or bismuth
    • C09K11/7407—Chalcogenides
    • C09K11/7421—Chalcogenides with alkaline earth metals
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C09K11/00—Luminescent materials, e.g. electroluminescent or chemiluminescent
    • C09K11/08—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials
    • C09K11/77—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals
    • C09K11/7701—Chalogenides
    • C09K11/7703—Chalogenides with alkaline earth metals
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C09K11/00—Luminescent materials, e.g. electroluminescent or chemiluminescent
    • C09K11/08—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials
    • C09K11/77—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals
    • C09K11/7759—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals containing samarium
    • C09K11/776—Chalcogenides
    • C09K11/7761—Chalcogenides with alkaline earth metals
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    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent materials, e.g. electroluminescent or chemiluminescent
    • C09K11/08—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials
    • C09K11/77—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals
    • C09K11/7766—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
    • C09K11/7774—Aluminates
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C09K11/00—Luminescent materials, e.g. electroluminescent or chemiluminescent
    • C09K11/08—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials
    • C09K11/77—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals
    • C09K11/7766—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
    • C09K11/77744—Aluminosilicates
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent materials, e.g. electroluminescent or chemiluminescent
    • C09K11/08—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials
    • C09K11/77—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals
    • C09K11/7783—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals one of which being europium
    • C09K11/77922—Silicates
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K9/00—Tenebrescent materials, i.e. materials for which the range of wavelengths for energy absorption is changed as a result of excitation by some form of energy
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/851—Wavelength conversion means
    • H10H20/8511—Wavelength conversion means characterised by their material, e.g. binder
    • H10H20/8512—Wavelength conversion materials
    • H10H20/8513—Wavelength conversion materials having two or more wavelength conversion materials
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent materials, e.g. electroluminescent or chemiluminescent
    • C09K11/08—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Definitions

  • the invention relates to an alternating current LED white light illumination device and a manufacturing method thereof, and belongs to the field of LED manufacturing. More specifically, it relates to a method of preparing an AC LED white light illumination device using a blue afterglow luminescent material and a yellow luminescent material.
  • LED is used in the fields of illumination, display and backlight, and it has attracted extensive attention as the most promising next-generation lighting method with its advantages of energy saving, durability and pollution-free.
  • white LEDs blue LED chips and yellow phosphors are used to achieve white light emission. It is the most mature technical solution for preparing white LEDs.
  • Appl. Phys. Lett., Vol. 01, p. 53 reports the luminescent material Y 3 A1 5 0 12 : Ce 3+ , which has yellow luminescence, the strongest luminescence wavelength is 550 nm, and the lifetime is less than 100 nal. second.
  • CN1004641 1 1C discloses an AC LED lamp which uses LED chips of different illuminating colors in parallel in an AC power source, mainly describes LED chips of different colors to form white light together, and specific circuits thereof, such as red, green and blue light-emitting chips. Without involving luminescent powder.
  • U.S. Patent No. 7,489,086, B2 discloses an AC LED driver and an illumination device using the same.
  • the patent also focuses on the composition of the circuit, and no innovation has been reported for the luminescent powder, still using the conventional Y 3 A1 5 0 12 : Ce 3+ luminescent powder.
  • the inventors of the present invention have studied Y 2 (VAl 2 (VSi0 2 : Ce-B-Na-P luminescent material) and a white LED illuminating device using the same (Chinese Patent Application No. 200910307357. 3)
  • Blue LED chip or ultraviolet chip + blue afterglow luminescent material A + yellow luminescent material B the weight ratio of the blue afterglow luminescent material A to the yellow luminescent material B is 10 - 70 wt%: 30 to 90 wt% o. Preferably: 20 ⁇ 50wt%: 50 ⁇ 80wt%.
  • the blue afterglow luminescent material A has an emission wavelength peak of between 440 and 490 nm.
  • the blue afterglow luminescent material A is Sr 4 Al 14 0 25 :Eu 2+ , Dy 3+ , Sr 2 MgSi 2 0 7 :Eu 2+ , Dy 3 ⁇
  • CaS at least one of Bi 3+ , Na + , CaS: Cu + , Na + or CaSrS:Bi 3+ .
  • the yellow luminescent material B has an emission wavelength peak between 520 and 580 nm.
  • the yellow luminescent material B is a luminescent material having an afterglow phenomenon, a yellow luminescent material having no afterglow, or a mixture of the two.
  • the yellow luminescent material B is: Y 2 0 3 *Al 2 0 3 *Si0 2 : Ce*B'Na*P, Y 2 0 2 S : Mg, Ti, Sr 3 Si0 5 : Eu 2+ , Dy 3+ , C3 ⁇ 4MgSi 2 0 7 : Eu 2+ , Dy ⁇ CaS: at least one of Sm 3+ , YAG : Ce or TAG: Ce.
  • the white light emission of the LED white light illumination device of the invention comes from the blue light emitted by the blue afterglow luminescent powder under the excitation of the blue LED chip or the ultraviolet chip, and the yellow light emitted by the yellow luminescent powder and the light of the chip are combined into white light.
  • the above-mentioned luminescent powder can also be excited by the violet light and the ultraviolet LED chip, and the same effect is produced.
  • the luminescent material coating of the present invention may employ a mixed luminescent coating of blue afterglow luminescent material A + yellow luminescent material B.
  • the blue afterglow luminescent material A may be applied to the chip and then the yellow luminescent material B may be coated on the blue afterglow luminescent material A.
  • the principle of the AC white light illumination device of the invention is as follows:
  • the illumination of the LED based on the module also has a periodicity of light and dark changes, that is, strobe, This affects the use of the device.
  • the illuminating can be maintained when the excitation light source disappears.
  • the blue afterglow material emits blue afterglow when the current period changes. It plays the role of compensating for blue light and exciting yellow luminescent powder, thereby overcoming the influence of the stroboscopic flash of the LED chip on the illumination device caused by the fluctuation of the alternating current, so that the light output of the device during the alternating current period is stable.
  • the LED chip does not work for half a cycle during the AC cycle, its thermal effect is reduced, which helps to overcome the series of problems caused by the chip heat generated by the existing LED white light illumination device.
  • Figure 1 is a schematic diagram of the basic module of the AC LED lighting device
  • Figure 2 shows the Sr 4 Al 14 0 25: E U 2+ , Dy 3+ afterglow spectrum
  • Figure 3 shows the afterglow spectrum of Sr 2 MgSi 2 0 7: Eu 2+ and Dy 3+
  • Figure 4 is a photoluminescence spectrum of Y 2 (VAl 2 (VSi0 2 : Ce-B-Na-P)
  • Figure 5 is a schematic diagram of the composition of the LED lighting unit
  • Figure 5 1 is a blue afterglow luminescent material A+ yellow luminescent material B mixed luminescent coating; 2 is a blue, violet or ultraviolet LED chip; 3 is a lens.
  • Figure 5-2 2 is a blue, violet or ultraviolet LED chip; 3 is a lens, 5 is a coating of blue afterglow material A, and 4 is a coating of yellow luminescent material B.
  • 3 is a lens
  • 5 is a coating of blue afterglow material A
  • 4 is a coating of yellow luminescent material B.
  • a new LED white light illumination device consists of a blue LED chip + blue afterglow luminescent material A + yellow luminescent material B.
  • the weight ratio of the blue afterglow luminescent material A to the yellow luminescent material B is 10 - 70 wt%: 30-90 wt% o is preferably: 20-50 wt%: 50-80 wt%.
  • the blue afterglow luminescent material A has a peak wavelength of 440-490 nm, such as: Sr 4 Al 14 0 25 :Eu 2+ , Dy 3+ , Sr 2 MgSi 2 0 7 :Eu 2+ , Dy 3 + , CaS: Bi 3+ , Na + , CaS: Cu + , Na + , CaSrS: Bi 3+ . It may be a combination of one or more blue afterglow luminescent materials.
  • the yellow luminescent material B may be a luminescent material having an afterglow phenomenon, a yellow luminescent material having no afterglow, or a mixture of the two. Its emission wavelength peaks between 520 and 580 nanometers.
  • the white light emission of the LED white light illumination device of the present invention comes from the blue light emitted by the blue afterglow luminescent powder excited by the blue LED chip, and the yellow light emitted by the yellow luminescent powder and the light of the chip are combined into white light.
  • the AC LED white light illumination device of the present invention can realize AC input by connecting two reverse LEDs or a bridge circuit in parallel.
  • the illumination of the LEDs based on the two modules also has a periodicity of light and dark variations, that is, strobes, which affect the use of the device.
  • the illuminating can be maintained when the excitation light source disappears.
  • the blue afterglow material emits blue afterglow when the current period changes. , to compensate for the blue light and stimulate the yellow luminescent powder, thereby overcoming the LED chip caused by the fluctuation of the alternating current
  • the effect of the stroboscopic strobe on the illumination device stabilizes the light output of the device during the AC cycle.
  • the LED chip does not work for half a cycle in the AC cycle, its thermal effect is reduced, which helps to overcome the series of problems caused by the chip heating encountered in the use of the existing LED white light illumination device.
  • the preparation method is as follows: The luminescent materials A and B are passed through a 500 mesh sieve, and then in the embodiment 1 18 The ratio described is that the A and B materials are uniformly mixed and then packaged using an LED chip having a power of 0.1 W to form a basic unit such as the AC LED white light illumination device of FIG.
  • Test Example 1 Light-emitting characteristics of the AC LED lighting device of the present invention
  • Table 2 shows the commercial power of the LED chip given in the embodiment 1-18.
  • Direct buck but not straight
  • the illuminating brightness of the power supply, as shown in the module of Fig. 1, is measured within 20 milliseconds of a high speed camera that takes 300 pictures per second.
  • the reference sample is an AC LED lighting device composed of a white LED chip of a yellow luminescent material on a commercially available blue chip package in the same manner.
  • the brightness data in Table 2 is the relative brightness of the test of the instrument, dimensionless.
  • Example 2 2760 2930 2710 2000 1852 1783
  • Example 3 2686 2763 2615 1947 1832
  • Example 4 2800 2915 2875 2111 1995 1863
  • Example 5 2532 2621 2512 1869 1814 1711
  • Example 6 2611 2774 2649 2001 1931 1801
  • Example 7 2300 2423 2400 1604 1542 1488
  • Example 8 2800 2958 2889 2100 2004 1950
  • Example 9 2700 2860 2700 1999 1900 1746
  • Example 10 2333 2621 2536 1900 1632 1423
  • Example 11 2597 2741 2635 1815 1763 1600
  • Example 13 2633 2777 2654 1757 1583 1489
  • Example 14 2763 2810 2777 1997 1835 1711
  • Example 15 2343 2661 2532 1870 1732 1554
  • Example 18 2683 2797 2701 1857 1665 The data of Table 1 illustrates the invention in alternating current
  • the illumination in the cycle is relatively stable, and the illumination obtained by the white LED illumination device using the commercially available blue chip package on the yellow luminescent material is unstable, and does not emit light due to the voltage reversal in the negative half cycle of the alternating current.
  • Test Example 2 Light fading of the alternating current LED illuminating device of the present invention
  • Table 3 gives the light decay data for Example 1 18 and the reference.
  • the reference is a lighting device in which a white LED chip on which a commercially available blue chip is packaged with a yellow luminescent material is installed in a current general-purpose DC power supply mode.
  • the test method is as follows: Will be implemented The illuminating brightness of the alternating current LED lighting device and the reference sample according to the examples 1 to 18 is measured at a certain interval time after being energized, and the results are shown in Table 3.
  • the data in Table 3 is relative brightness, normalized to the original data.
  • the data of Table 2-3 shows that the AC LED white light illumination device prepared by using the blue afterglow luminescent material and the yellow luminescent material of the invention has the advantages of stable illumination and low light decay during AC power supply, and has the advantages of the existing LED illumination device. Obvious novelty and creativity.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Luminescent Compositions (AREA)
  • Led Device Packages (AREA)

Description

白光 LED照明装置 技术领域
本发明涉及一种交流 LED白光照明装置及其制造方法， 属于 LED制造领域。更具体的说， 涉及一种使用蓝色余辉发光材料和黄色发光材料制备交流 LED白光照明装置的方法。
背景技术
目前， LED用于照明、 显示和背光源等领域， 并以其节能、 耐用、 无污染等优点作为最 有希望的下一代照明方式而引起广泛的重视。 实现白光 LED有多种方案,其中采用蓝光 LED 芯片和黄色荧光粉组合来实现白光发射，是当前制备白光 LED最为成熟的技术方案。 1967年 《Appl . Phys. Lett.》第 1 1卷第 53页报道了发光材料 Y3A15012 : Ce3+， 该材料具有黄色发光， 最强发光波长在 550纳米， 寿命小于 100纳秒。 1997年《App l . Phys. Α»第 64期 417页报道 了利用 Y3Al5012 : Ce3+的黄色发光和蓝光氮化镓实现了 LED白光发射，此技术是当前制备白光 LED 最为成熟的技术方案。 但在实际应用中，随着工作中器件温度的升高，蓝光 LED芯片和荧光粉 的发光强度都会下降，而且荧光粉的发光强度下降更为显著， 这就影响了 LED 的使用。 传统 LED 都用直流电做为驱动能源， 然而目前不论是家庭、 工商业或公共用电， 大多以交流电的 方式提供， 因此在使用 LED作为照明等用途时必须附带整流变压器将交流 /直流转换，才能确 保 LED的正常运作。 但在交流 /直流转换的过程中， 有高达 15〜30%的电力耗损， 同时转换设 备成本也很可观， 在安装上也费工费时， 效率不高。 CN1004641 1 1C公布了一种利用不同发光 颜色的 LED芯片并联在交流电源中的交流 LED灯， 主要描述不同颜色的 LED芯片在一起构成 白光，及其具体电路，如红、绿和蓝色发光芯片，而没有涉及发光粉。美国专利 US 7， 489， 086， B2 公布了一种交流 LED驱动装置及使用它的照明器件该专利也着重于电路的组成， 而对发光粉 未见创新报道，仍然是使用传统 Y3A15012 : Ce3+发光粉。 本发明的发明人研究了一种具有黄色长 余辉现象的 Y2(VAl2(VSi02 : Ce-B-Na-P发光材料及使用它的白光 LED照明装置（中国专利申请 200910307357. 3 )„
目前， 仍然需要进行交流 LED白光照明装置的研究， 以克服温度淬灭效应和交流电流方 向改变给交流 LED白光照明装置带来的影响， 为 LED白光照明领域提供更多选择。
发明内容
本发明的目的是提供一种新的 LED白光照明装置。
本发明的技术方案： 蓝光 LED芯片或紫外芯片 +蓝色余辉发光材料 A+黄色发光材料 B。其 中，蓝色余辉发光材料 A与黄色发光材料 B的重量配比为 10 - 70wt%： 30~90wt%o优选的是： 20~50wt%: 50~80wt%。
进一步地， 所述蓝色余辉发光材料 A的发光波长峰值在 440-490纳米之间。
进一步地， 所述蓝色余辉发光材料 A 为 Sr4Al14025:Eu2+,Dy3+、 Sr2MgSi207:Eu2+,Dy3\
CaS:Bi3+,Na+、 CaS:Cu+,Na+或 CaSrS:Bi3+中的至少一种。
所述黄色发光材料 B的发光波长峰值在 520— 580纳米之间。
进一步地， 黄色发光材料 B是具有余辉现象的发光材料、 不具有余辉的黄色发光材料， 或二者混合。
进一步地， 黄色发光材料 B是： Y203*Al203*Si02 : Ce*B'Na*P、 Y202S : Mg，Ti、 Sr3Si05 : Eu2+, Dy3+、 C¾MgSi207 : Eu2+, Dy \ CaS:Sm3+、 YAG : Ce或 TAG: Ce中的至少一种。
本发明 LED白光照明装置的白光发射来自于在蓝光 LED芯片或紫外芯片的激发下， 蓝色 余辉发光粉发射的蓝光， 黄色发光粉发射的黄光与芯片的光组合成白光。
用紫光和紫外 LED芯片也能激发上述发光粉， 产生同样的效果。
本发明发光材料涂层可以采用蓝色余辉发光材料 A+黄色发光材料 B的混合发光涂层。 也可以先将蓝色余辉发光材料 A涂在芯片上后再在蓝色余辉发光材料 A涂层上黄色发光材料 B。
本发明交流 LED白光照明装置原理如下：
通过附图 1中所示的交流 LED照明装置的基本模块示意图可以看出， 由于交流电的周期 性特性， 所以基于此模块的 LED的发光也会具有明暗变化的周期性， 亦即发光频闪， 从而影 响器件的使用。
本发明由于采用具有余辉特性的发光材料， 在激发光源消失时能维持发光， 这样， 在基 于本发明方案的交流 LED白光照明装置中， 当电流周期变化时， 蓝色余辉材料会发射蓝色余 辉， 起到了弥补蓝光和激发黄色发光粉的作用， 从而克服了由于交流电波动导致的 LED芯片 的发光频闪对照明器件的影响， 使器件在交流周期的光输出保持稳定。 另外， 由于在交流周 期内 LED芯片有半个周期不工作， 使得其热效应下降， 这样有助于克服现有 LED白光照明装 置使用中碰到的芯片发热带来的系列难题。
说明书附图
图 1为交流 LED发光装置 LED基本模块示意图
图 2为 Sr4Al14025:EU 2+,Dy3+余辉光谱
图 3为 Sr2MgSi207:Eu2+,Dy3+余辉光谱
图 4为 Y2(VAl2(VSi02： Ce-B-Na-P的光致发光光谱 图 5为 LED发光单元组成示意图
图 5— 1， 1为蓝色余辉发光材料 A+黄色发光材料 B的混合发光涂层； 2为蓝光、 紫光 或紫外 LED芯片； 3为透镜。
图 5— 2， 2为蓝光、紫光或紫外 LED芯片； 3为透镜， 5为蓝色余辉发光材料 A的涂层，4 为黄色发光材料 B的涂层。 以下通过实施例形式的具体实施方式， 对本发明的上述内容再作进一歩的详细说明。 但 不应将此理解为本发明上述主题的范围仅限于以下的实例， 凡基于本发明上述内容所实现的 技术均属于本发明的范围。 特别是在基本电路组成上， 本发明的实施例仅给出了最简单的单 向串联式电路， 但本发明的交流 LED照明装置的电路并不局限于此， 还包括如反向串并联式 电路和桥式电路。 实施例中， 蓝光 LED芯片的发射波长为 460纳米， 紫光 LED芯片的发射 波长为 400nm, 紫外 LED芯片的发射波长为 365nm。
具体实施方式
一种新的 LED白光照明装置， 它是由蓝光 LED芯片 +蓝色余辉发光材料 A+黄色发光材料 B组成。 其中， 蓝色余辉发光材料 A与黄色发光材料 B的重量配比为 10 - 70wt%： 30-90wt%o 优选的是： 20-50wt% : 50_80wt%。
其中，蓝色余辉发光材料 A的发光波长峰值在 440-490纳米之间，如： Sr4Al14025:Eu2+,Dy3+、 Sr2MgSi207:Eu2+,Dy3+、 CaS:Bi3+,Na+、 CaS:Cu+,Na+、 CaSrS:Bi3+。可以是一种或一种以上蓝色 余辉发光材料的组合。
黄色发光材料 B可以是具有余辉现象的发光材料，也可以是不具有余辉的黄色发光材料， 或是二者混合。 其发光波长峰值在 520— 580纳米之间。 具有余辉现象的发光材料： Ce激活 的具有余辉现象的 Y203.Al203.Si02 : Ce.B.Na.P、 Y202S:Mg,Ti、 Sr3Si05:Eu2+， Dy3+、 Ca2MgSi207:Eu2+，Dy3+、 CaS: Sm3+ ; 不具有余辉的黄色发光材料 YAG : Ce和 TAG: Ce。
本发明 LED白光照明装置的白光发射来自于在蓝光 LED芯片激发下， 蓝色余辉发光粉发 射的蓝光， 黄色发光粉发射的黄光与芯片的光组合成白光。
本发明交流 LED白光照明装置通过并联两个反向的 LED或桥式电路可以实现交流输入。 但是由于交流电的周期性特性， 所以基于此两个模块的 LED的发光也会具有明暗变化的周期 性， 亦即发光频闪， 从而影响器件的使用。
本发明由于采用具有余辉特性的发光材料， 在激发光源消失时能维持发光， 这样， 在基 于本发明方案的交流 LED白光照明装置中， 当电流周期变化时， 蓝色余辉材料会发射蓝色余 辉， 起到了弥补蓝光和激发黄色发光粉的作用， 从而克服了由于交流电波动导致的 LED芯片 的发光频闪对照明器件的影响， 使器件在交流周期的光输出保持稳定。 另外， 由于在交流周 期内 LED芯片有半个周期不工作， 使得其热效应下降， 这样有助于克服现有 LED白光照明装 置使用中碰到的芯片发热带来的系列难题。
以下是具体实施例。 实施例 1-18
表 1
Figure imgf000006_0001
10%Sr2MgSi207:Eu2+, Dy3+
10 紫光 55%Tb3Al5012:Ce
+ 35%Sr4Al14025 :Eu2+, Dy3+
5%Sr2MgSi207 :Eu2+, Dy3+ 25%Y203»Al203*Si02:Ce»B»Na'P
11 紫光 + 25%Sr4Al14025 :Eu2+, Dy3+ +20%Sr3Si05:Eu2+, Dy3+
+15%CaS:Bi3+, Na+ +10%C¾MgSi207:Eu2+, Dy +
10%Sr2MgSi207： Eu2+, Dy3+
+10%CaSrS:Bi+
10%Y202S:Mg, Ti
12 紫光 +35%Sr4Al14025:Eu2+, Dy+
+25 %Y203*Al203'Si¾： Ce'B.Na'P +5%CaS:Bi3+, Na+
+5%CaS:Cu+, Na+
13 紫外 40%Sr2MgSi207:Eu2+, Dy3+ 60%Y3Al5012:Ce
14 紫外 30%Sr4Al14025 :Eu2+, Dy3+ 70%Tb3Al5012:Ce
20%Sr2MgSi207:Eu2+, Dy3+
15 紫外 45%Y203»Al203*Si02:Ce»B»Na'P
+ 35%Sr4Al14025 :Eu2+, Dy3+
10 Sr2MgSi207:Eu2+, Dy3+ 30 Y203*Al203*Si02:Ce*B*Na*P
16 紫外 + 25%Sr4Al14025 :Eu2+, Dy3+ +15%Sr3Si05:Eu2+, Dy3+
+5%CaS:Bi3+, Na+ +15%C¾MgSi207:Eu2+, Dy3+
15%Sr2MgSi207:Eu2+, Dy3+
+5% CaSrS:Bi3+
20%Y202S:Mg, Ti
17 紫外 +10%Sr4Al14025:Eu2+, Dy3+
+40 %Y203*Al203'Si02： Ce.B.Na'P +5%CaS:Bi+, Na+
+5%CaS:Cu+, Na+
10%Sr2MgSi207： Eu2+, Dy+ 15%Sr3Si05:Eu2+, Dy+
18 紫外 +5%CaSrS:Bi3+ +15 C¾MgSi207:Eu2+, Dy3+
+35%Sr4Al14025:Eu2+, Dy3+ + 20%Y3Al5012:Ce 制备方法如下： 将发光材料 A和 B过 500目筛， 然后按实施例 1 18中所描述的比例将 A和 B材料混合均匀后使用功率为 0.1W的 LED芯片封装， 做成基本单元如图 1的交流 LED白 光照明装置。
试验例 1 本发明交流 LED发光装置发光特性
由于常用交流电的频率为 50赫兹， 也就是周期为 20亳秒， 方向不变而电流大小变化为 半周期 10亳秒， 表 2给出了实施例 1一 18所给出的 LED芯片用市电直接降压但未经过交直 变换供电的、如图一模块所示的发光器件用每秒拍 300张照片的高速摄像机测试的 20毫秒内 的发光亮度。 参比样为市售蓝光芯片封装上黄色发光材料的白光 LED芯片按同一方式组成的 交流 LED照明装置。 表 2中亮度数据为仪器的测试相对亮度， 无量纲。
表 2
3. 33 6. 66 13. 32
时间 毫秒 毫秒 禾少
参比样亮度 2856 3266 2900 0 0 0 实施例 1亮度 2786 2878 2735 2087 1900 1816
实施例 2 2760 2930 2710 2000 1852 1783 实施例 3 2686 2763 2615 1947 1832 1700 实施例 4 2800 2915 2875 2111 1995 1863
秦
实施例 5 2532 2621 2512 1869 1814 1711 实施例 6 2611 2774 2649 2001 1931 1801 实施例 7 2300 2423 2400 1604 1542 1488 实施例 8 2800 2958 2889 2100 2004 1950
鞭
实施例 9 2700 2860 2700 1999 1900 1746 实施例 10 2333 2621 2536 1900 1632 1423 实施例 11 2597 2741 2635 1815 1763 1600 实施例 12 2122 2429 2235 1522 1400 1283 实施例 13 2633 2777 2654 1757 1583 1489 实施例 14 2763 2810 2777 1997 1835 1711 实施例 15 2343 2661 2532 1870 1732 1554 实施例 16 2637 2788 2700 1800 1712 1611 实施例 17 2322 2529 2435 1612 1506 1383 实施例 18 2683 2797 2701 1857 1665 1500 从表 1的数据说明本发明在交流电周期中的发光较为稳定， 而使用现有市售蓝光芯片封 装上黄色发光材料的白光 LED照明装置获得的发光不稳定， 且在交流电负半周期内由于电压 反向不发光。
试验例 2 本发明交流 LED发光装置的光衰
表 3给出了实施例 1 18和参比样的光衰数据。 参比样为将市售蓝光芯片封装上黄色发 光材料的白光 LED芯片按目前通用的直流供电方式安装的照明装置。 测试方法如下： 将实施 例 1一 18所述交流 LED照明装置和参比样通电后在一定间隔时间内测其发光亮度， 结果如表 3所示。 表 3中数据为相对亮度， 以最初数据归一化。
表 3
时间 1小时 1000小时 1500小时 2500小时
参比样亮度 100 98 97 94 实施例 1亮度 100 99. 8 99. 3 99. 2 实施例 2 100 99. 5 99. 2 99 实施例 3 100 99. 5 99 98 实施例 4 100 99. 7 99. 3 99 实施例 5 100 99. 8 99. 4 98. 6 实施例 6 100 99. 5 99 98 实施例 7 100 99. 4 99 98. 3 实施例 8 100 99. 7 99. 2 99 实施例 9 100 99. 5 99 98 实施例 10 100 99. 6 99 98. 6 实施例 11 100 99. 5 99 98 实施例 12 100 99. 3 99 98. 2 实施例 13 100 99. 5 99 98 实施例 14 100 99. 6 99. 1 98 实施例 15 100 99. 5 99 98 实施例 16 100 99. 8 99. 2 99 实施例 17 100 99. 4 99. 1 98. 5 实施例 18 100 99. 5 99. 3 98. 4 从表 3的数据可以看出本发明的交流白光 LED照明装置的亮度衰减要小于采用现有方式 的 LED照明装置。
表 2— 3的数据说明，本发明的使用蓝光余辉发光材料和黄色发光材料制备的交流 LED白 光照明装置具有在交流供电时发光稳定以及光衰小的优点， 与现有 LED照明装置相比具有明 显的新颖性和创造性。

Claims

权利要求书
1、 白光 LED照明装置， 其特征在于： 所述白光 LED照明装置内部封装的芯片为蓝光、 紫 光或紫外 LED芯片， 其发光涂层采用的发光材料为蓝色余辉发光材料 A与黄色发光材料 B的 组合， 其中， 蓝色余辉发光材料 A与黄色发光材料 B的重量配比为 10~70wt%： 30〜90wt%。
2、 根据权利要求 1所述的白光 LED照明装置， 其特征在于： 蓝色余辉发光材料 A与黄色 发光材料 B的重量配比为： 20~50wt%： 50~80wt%„
3、根据权利要求 1或 2所述的白光 LED照明装置， 其特征在于： 所述蓝色余辉发光材料 A的发光波长峰值在 440~490纳米之间。
4、根据权利要求 3所述的白光 LED照明装置， 其特征在于： 所述蓝色余辉发光材料 A为 Sr4Al14025:Eu2+，Dy3+、 Sr2MgSi207:Eu2+,Dy3+、 CaS:Bi3+,Na+、 CaS:Cu+，Na+或 CaSrS:Bi3+中的至 少一种。
5、根据权利要求 1或 2所述的白光 LED照明装置， 其特征在于： 黄色发光材料 B的发光 波长峰值在 520~580纳米之间
6、根据权利要求 5所述的白光 LED照明装置， 其特征在于： 黄色发光材料 B是具有余辉 现象的发光材料、 不具有余辉的黄色发光材料， 或二者混合。
7、 根据权利要求 5 所述的白光 LED 照明装置， 其特征在于： 黄色发光材料 B 是： Y203*Al203*Si02 : Ce*B*Na'P、 Y202S :Mg，Ti、 Sr3Si05 : Eu2+, Dy3+、 C¾MgSi207 : Eu2+， Dy3+、 CaS:Sm3+、
YAG : Ce或 TAG: Ce中的至少一种。
8、 根据权利要求 1~7任一项所述的白光 LED照明装置， 其特征在于： 所述发光涂层为 蓝色余辉发光材料 A与黄色发光材料 B混合后的涂层。
9、 根据权利要求 1~7任一项所述的白光 LED照明装置， 其特征在于： 所述发光涂层为 蓝色余辉发光材料 A的涂层， 黄色发光材料 B的涂层。
10、 根据权利要求 1~9任一项所述的白光 LED照明装置， 其特征在于： 所述的白光 LED 照明装置的供电频率不小于 50赫兹。
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