EP3031302A1 - Substances luminescentes - Google Patents

Substances luminescentes

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Publication number
EP3031302A1
EP3031302A1 EP14739677.4A EP14739677A EP3031302A1 EP 3031302 A1 EP3031302 A1 EP 3031302A1 EP 14739677 A EP14739677 A EP 14739677A EP 3031302 A1 EP3031302 A1 EP 3031302A1
Authority
EP
European Patent Office
Prior art keywords
formula
compounds
mmol
phosphor
formulas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP14739677.4A
Other languages
German (de)
English (en)
Inventor
Holger Winkler
Thomas Juestel
Arturas Katelnikovas
Tobias DIERKES
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Merck Patent GmbH
Original Assignee
Merck Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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Priority to EP14739677.4A priority Critical patent/EP3031302A1/fr
Publication of EP3031302A1 publication Critical patent/EP3031302A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/12—Light sources with substantially two-dimensional [2D] radiating surfaces
    • H05B33/14—Light sources with substantially two-dimensional [2D] radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
    • 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
    • C09K11/77928—Silicon Aluminium Nitrides or Silicon Aluminium Oxynitrides
    • 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

Definitions

  • inorganic phosphors have been developed to spectrally adapt emissive screens, X-ray amplifiers and radiation or light sources to optimally meet the requirements of the respective field of application while using as little energy as possible.
  • new phosphors are constantly being developed in order to further increase energy efficiency, color rendering and stability.
  • These phosphors are used in particular as conversion phosphors for phosphor converted LEDs, in short pc LEDs.
  • yellow or green and red emitting phosphors are needed when the primary energy source is a blue emitting semiconductor.
  • the luminescent screen must contain either an RGB phosphor mixture or a dichroic mixture of a blue-cyan and a yellow-orange emitting phosphor.
  • the second variant gives a higher lumen equivalent, provided broadband emitters are used in all cases.
  • Another advantage of a dichromatic phosphor mixture is the lower spectral interaction and the associated higher "package gain.” This is also the reason why dichromatic white LEDs based on a blue-emitting semiconductor and a YAG: Ce phosphor as Luminescent screen with respect to the lumen equivalent and the associated lumen efficiency have very good properties and are widely used.
  • the biggest disadvantage of dichromatic (blue-yellow) LEDs is their high color temperature (> 4000 K) and the low color rendering in the red spectral range.
  • trichromatic LEDs based on a blue semiconductor and a green and a red-emitting phosphor have significant advantages. For this purpose, the search for improved red and green emitting phosphors continues.
  • conversion phosphor materials systems such as alkaline earth orthosilicates, thiogallates, garnets, nitrides, oxy nitrides and ⁇ -SiAION'e, each doped with Ce 3+ or Eu 2+ .
  • T. Kurushima et al. J. Electrochem.Soc., 2010, 157 (3), J64-J68 disclose a strontium-yttrium-aluminum-silicooxynitride obtained in a solid state synthesis using ammonium chloride as a flux. The use of this compound as a phosphor in a phosphor converted LED is not disclosed.
  • the present invention is a compound of the following formula (1):
  • EA is selected from the group consisting of Mg, Ca, Sr, Ba or a mixture of two or more of the elements Mg, Ca, Sr and Ba;
  • M is selected from the group consisting of Y, Lu or one
  • Sr and M stands for Y
  • EA is other than Sr when M is Y.
  • EA is a mixture of two or more of the elements Mg, Ca, Sr or Ba and / or M is a mixture of Y and Lu. It is thus preferably a compound of the following formula (2),
  • Preferred embodiments of the compounds of the formula (2) are compounds in which simultaneously Ca and Sr, Sr and Ba or Y and Lu are present. Preference is thus given to the compounds of the following formulas (2a) to (2n),
  • the ratio of the alkaline earth metals to each other or the metals M to each other is arbitrary and fully adjustable. Depending on this ratio, the emission color of the compounds according to the invention can be adjusted.
  • the ratio of Mg: Ca, Mg: Sr, Ca: Sr, Ca: Ba or Sr: Ba is based on the amounts of substance, ie the ratio of a: b, a: c, b: c , b: d or c: d, in the formulas (2a) to (2j) between 50: 1 and 1:50, particularly preferably between 20: 1 and 1:20, very particularly preferably between 10: 1 and 1: 10th
  • the ratio of Y: Lu, based on the molar amounts, ie the ratio of e: f, in the formulas (2k) to (2n) between 50: 1 and 1:50, is particularly preferred between 20: 1 and 1:20, most preferably between 10: 1 and 1:10, in particular between 5: 1 and 1: 5.
  • the alkaline earth metal EA is Ba or equal to Ca or equal to Mg. It is therefore preferably a compound of the following formula (3), (4) or (5) Formula (3) Ca 1 .yMSi-x Alx N 7 .x O x: y Eu 2+ Formula (4) Ba 1 .yMSi 4-x Alx N 7 .x O x: y Eu 2+ Formula (5) wherein the symbols and indices used are those mentioned above
  • Preferred embodiments of the compounds of the formula (3), (4) and (5) are the compounds of the following formulas (3a), (3b), (4a), (4b), (5a) and (5b)
  • the metal M is lutetium. It is therefore preferably a compound of the following formula (6),
  • Preferred embodiments of the compounds of the formula (6) are the compounds of the following formulas (6a), (6b) and (6c),
  • the compounds according to formula (1) to (6) or formula (2a) to (2n) or formula (3a) or (3b) or formula (4a) or (4b) or (5a) or (5b) or formula (6a) to (6c) applies to the index x, that 0.5 ⁇ x 2.0, particularly preferably 1, 1 ⁇ x ⁇ 1, 8, particularly preferably 1, 3 ⁇ x ⁇ 1, 7.
  • the compounds according to formula (1) to (6) or formula (2a) to (2n) or formula (3a) or (3b) or formula (4a) or (4b) or (5a ) or (5b) or formula (6a) to (6c) applies to the index y, that 0 ⁇ y ⁇ 0.20, particularly preferably 0.02 ⁇ y ⁇ 0.16.
  • the value of y, ie the proportion of Eu can set the emission color of the phosphor over a certain range.
  • the compounds according to the invention contain not only Mg as alkaline earth metal, ie H. that they either contain only Ca, Sr and / or Ba as alkaline earth metals, or that, if they contain Mg, they contain this in admixture with Ca and / or Sr, in particular in admixture with Ca. If Mg is present in admixture with Ca and / or Sr, then Ca or Sr is preferably present in this mixture at least 30 at%, more preferably at least 50 at%.
  • the compounds according to the invention contain no Mg at all, ie. H. in compounds of the formula (2) and the preferred embodiments, the index a is preferably 0.
  • Another object of the present invention is a process for preparing the compounds of the invention, comprising the following steps: a) preparing a mixture of a Mg, Ca, Sr and / or Ba compound, a Y and / or Lu compound, an Si compound, an Al compound and an Eu compound, at least one of which is in the form of a nitride and at least one of these compounds is in the form of an oxide; and b) calcining the mixture under non-oxidizing conditions.
  • Suitable Ca, Sr or Ba compounds are, in particular, the corresponding nitrides, oxides and carbonates. Preference is given to the nitrides, ie Calcium nitride (Ca 3 N 2), strontium nitride (Sr3N 2), barium nitride (Ba3N2) and mixtures thereof.
  • Suitable Y or Lu compounds are, in particular, the corresponding oxides, ie Y 2 O 3 and Lu 2 O 3 and mixtures thereof, but also the corresponding nitrides YN or LuN and mixtures thereof.
  • Silicon compounds are in particular silicon nitride and
  • Silica and mixtures thereof Preference is given to silicon nitride (Si 3 N 4 ).
  • Suitable aluminum compounds are in particular aluminum nitride and aluminum oxide and mixtures thereof. Preference is given to aluminum nitride (AIN).
  • europium compounds are europium oxide (especially Eu 2 O 3 ) and europium nitride (EuN) and mixtures thereof.
  • the educts used in step a) of the process according to the invention are preferably used in a ratio to one another such that the atomic number of alkaline earth metal, of lutetium and / or yttrium, of silicon, of aluminum, of europium, of nitrogen and of oxygen to the desired ratio Product of the above
  • the starting materials are preferably chosen so that the ratio of nitrogen to oxygen in the starting materials corresponds to the ratio in the product. So whether the starting material is used in the form of the nitride and / or the oxide, also decides on the basis of the desired nitrogen-oxygen ratio in the product.
  • the mixture in step a) of the process according to the invention is preferably prepared by processing the starting compounds into a homogeneous mixture, ie they are in powder form used and processed together, for example by a mortar to a homogeneous mixture.
  • the calcining step, ie step b) of the process according to the invention is carried out under non-oxidizing conditions.
  • Non-oxidizing conditions are understood as meaning any conceivable non-oxidizing atmospheres, in particular largely or completely oxygen-free atmospheres, ie an atmosphere whose maximum oxygen content is ⁇ 100 ppm, in particular ⁇ 10 ppm.
  • a non-oxidizing atmosphere can be generated, for example, by the use of inert gas, in particular nitrogen or argon.
  • a preferred non-oxidizing atmosphere is a reducing atmosphere.
  • the reducing atmosphere is defined as containing a reducing gas. Which gases have a reducing effect is known to the person skilled in the art.
  • Suitable reducing gases are hydrogen, carbon monoxide, ammonia or ethylene, more preferably hydrogen, which gases may also be mixed with other non-oxidizing gases.
  • the reducing atmosphere is particularly preferably prepared by a mixture of nitrogen and hydrogen, preferably in the ratio H 2 : N 2 of 10:50 to 33:30, in each case based on the volume.
  • the calcining step, ie step b) of the process according to the invention is preferably carried out at a temperature in the range from 1200 ° C. to 2000 ° C., more preferably in the range from 1400 ° C. to 1900 ° C. and very particularly preferably in the range from 1500 ° C. to 1700 ° C performed. It can be dispensed with the use of a flux.
  • the temperatures given above apply in particular to the preparation of compounds which contain only one alkaline earth metal. When using a mixture of several alkaline earth metals, lower calcination temperatures may also be preferred.
  • the period of calcination is preferably 1 to 48 hours, more preferably 5 to 24 hours, and most preferably 8 to 12 hours. Although this is not necessarily required in the process according to the invention, since the compounds can be prepared very well even without the addition of a flux at temperatures of about 1600 ° C., it is still possible to use a flux. With additional use of a flux and lower calcination temperatures may be preferred.
  • the calcining is preferably carried out in each case such that the resulting mixtures are introduced, for example, in a vessel made of boron nitride in a high-temperature furnace.
  • the high-temperature furnace for example, a tube furnace containing a support plate made of molybdenum foil.
  • the phosphor thus obtained is aftertreated, for example by mixing it with an alkaline earth metal nitride and again calcining this mixture.
  • the phosphors can be worked up by washing, for example by washing with dilute acid, such as. B. dilute HCl.
  • another calcining step is carried out, which is usually carried out at comparable temperatures as the first calcining step.
  • This further calcination step is preferably carried out under a reducing atmosphere. This can lead to better crystallinity of the product.
  • the compounds of the invention may be coated.
  • the stability to air and water can be improved by the coating.
  • Suitable for this purpose are all coating methods, as known to the person skilled in the art according to the prior art and used for phosphors.
  • Suitable materials for the coating are in particular metal oxides and nitrides, in particular earth metal oxides, such as Al 2 O 3 , and Erdmetallnitride, such as AIN, and Si0 2 , B 2 0 3 or BN.
  • the coating can tion, for example, from solution or by fluidized bed process. Further suitable coating methods are known from JP 04-304290, WO 91/10715, WO 99/27033, US 2007/0298250, WO 2009/065480 and WO 2010/075908.
  • Another object of the present invention is the use of the compound of the formula (1) or the above-mentioned preferred compounds according to the invention as a phosphor, in particular as a conversion phosphor.
  • the term “conversion luminescent material” is understood to mean a material which absorbs radiation in a specific wavelength range of the electromagnetic spectrum, preferably in the blue, violet or UV spectral range, and in another wavelength range of the electromagnetic spectrum, preferably in the red,
  • the term “radiation-induced emission efficiency” is to be understood, ie the conversion phosphor absorbs radiation in a certain wavelength range and emits radiation in another wavelength range with a certain efficiency.
  • a further subject of the present invention is an emission-converting material comprising the compound of the formula (1) according to the invention or the preferred embodiments.
  • the emission converting material may consist of the compound of the invention and in this case would be of the term defined above
  • the emission-converting material according to the invention contains, in addition to the compound according to the invention, further conversion phosphors.
  • the emission-converting material according to the invention contains a mixture of at least two conversion phosphors, one of which is a compound of the formula (1) or of the preferred embodiments according to the invention.
  • the at least two conversion Phosphors are phosphors that emit light of different wavelengths. Since the compound of the formula (1) or the preferred embodiments according to the invention are green or yellow emitting phosphors, these are preferably used in combination with an orange or red emitting phosphor and optionally additionally with a cyan or blue emitting phosphor. It may thus be preferred that the conversion phosphor according to the invention is used in combination with one or more further conversion phosphors in the emission-converting material according to the invention, which then together preferably emit white light.
  • blue light is defined as light whose emission maximum lies between 400 and 459 nm, cyan light whose emission maximum is between 460 and 505 nm, green light whose emission maximum lies between 506 and 545 nm , as yellow light such, whose emission maximum lies between 546 and 565 nm, as orange light such, whose
  • Emission maximum between 566 and 600 nm and is such as red light whose emission maximum is between 601 and 670 nm.
  • BaSrMgSi 2 0 7 Eu 2+ , BaTiP 2 0 7 , (Ba, Ti) 2 P 2 O 7 : Ti, Ba 3 WO 6 : U,
  • BaY 2 F 8 Er 3+ , Yb + , Be 2 Si0 4 : Mn 2+ , Bi 4 Ge 3 0 12 , CaAl 2 0 4 : Ce 3+ , CaLa 4 0 7 : Ce 3+ , CaAl 2 O: Eu 2+ , CaAl 2 O 4 : Mn 2+ , CaAl 4 O 7 : Pb 2+ , Mn 2+ , CaAl 2 O 4 : Tb 3+ ,
  • Ca3AI 2 Si 3 0i 2 Ce 3+
  • Ca3AI 2 Si 3 0i 2 Ce 3+
  • Ca 2 B 5 O 9 Br Eu 2+
  • CA2B 5 0 9 CI Eu 2+
  • Ca 2 B 5 O 9 CI Pb 2+
  • CaB 2 O 4 Mn 2+
  • Ca 2 B 2 O 5 Mn 2+
  • CaB 2 O 4 Pb 2 ⁇ CaB 2 P 2 0 9: Eu 2+, Ca 5 B 2 SiOio: Eu 3+,
  • Ca 2 Ba 3 (P0 4 ) 3 Cl Eu 2+ , CaBr 2 : Eu 2+ in Si0 2l
  • CaCl 2 Eu 2+ in Si0 2
  • CaCl 2 Eu 2+ , Mn 2+ in Si0 2
  • CaF 2 Eu 2+
  • CaF 2 : U CaGa 2 O 4 : Mn 2+ ,
  • CaGa 0 7 Mn 2+
  • CaGa 2 S 4 Ce 3+
  • CaGa 2 S 4 Eu 2+
  • CaGa 2 S Mn 2+
  • CaGa 2 S 4 Pb 2 ⁇ CaGe0 3 : Mn 2+ , Cal 2 : Eu + in Si0 2 , Cal 2 : Eu 2+ , Mn + in Si0 2> CaLaB0 4 : Eu J + , CaLaB 3 0 7 : Ce J + , Mrr, Ca 2 La 2 B0 6 .
  • Ca 2 P 2 O 7 Ce 3+ , ⁇ -Ca 3 (PO 4 ) 2 : Ce 3+ , ⁇ -Ca 3 (PO 4 ) 2 : Ce 3+ , Ca 5 (PO 4 ) 3 CI: Eu 2 + , Ca 5 (P0 4 ) 3 Cl: Sb 3+ , Ca 5 (PO 4 ) 3 Cl: Sn 2+ ,
  • beta-Ca 3 (PO 4) 2 Eu 2+, Mn 2+, Ca 5 (P0 4) 3 F: Mn 2+, Ca s (PO 4) 3 F: Sb 3+, Ca s (P0 4) 3 F: Sn a-Ca 3 (PO 4 ) 2 : Eu 2+ , ⁇ -Ca 3 (PO 4 ) 2 : Eu 2+ , Ca 2 P 2 O 7 : Eu 2+ , Ca 2 P 2 O 7 : Eu 2+, Mn 2 ⁇ CaP 2 0 6: Mn 2+, a-Ca 3 (P0 4) 2: Pb 2+, a-Ca 3 (PO 4) 2: Sn 2+, beta-Ca 3 (P0 4 ) 2 : Sn 2+ , ⁇ -Ca 2 P 2 O 7 : Sn, Mn, ⁇ -Ca 3 (PO 4 ) 2 : Tr, CaS: Bi 3+ , CaS: Bi 3+ , Na, CaS: Ce 3
  • CaTi0 3 Eu 3 ⁇ CaTi0 3 : Pr 3+ ( Ca 5 (V0 4 ) 3 Cl, CaW0 4> CaWO 4 : Pb 2+ , CaW0 4 : W, Ca 3 W0 6 : U, CaYAI0 4 : Eu 3+ , CaYBO 4: Bi 3+, CaYB0 4: Eu 3+, CaYB 0 8 O 3 .7. Eu 3+, CaY 2 Zr0 6: Eu 3 ⁇ (Ca, Zn, Mg) 3 (PO 4) 2: Sn, CeF 3 , (Ce.MgJBaAl OiaiCe,
  • GdNb0 4 Bi 3+ , Gd 2 0 2 S: Eu 3+ , Gd 2 0 2 Pr 3+ , Gd 2 0 2 S: Pr, Ce, F, Gd 2 O 2 S: Tb 3+ , Gd 2 Si0 5 : Ce 3+ , KAIn 0 17 : TI + , KGa 0 17 : Mn 2+ , K 2 La 2 Ti 3 O 10 : Eu, KMgF 3 : Eu + , KMgF 3 : Mn 2+ , K 2 SiF 6 : Mn + , LaAl 3 B 4 O 12 : Eu 3+ , LaAIB 2 0 6 : Eu 3+ , LaAIO 3 : Eu 3+ , LaAlO 3 : Sm 3+ , LaAsO 4 : Eu 3+ , LaBr 3 : Ce 3+ , LaB0 3 : Eu 3+ , (La, Ce, Tb) PO 4 : Ce: Tb
  • LiAIF Mn 2+ , LiAl 5 O 8 : Fe 3+ , LiAlO 2 : Fe 3+ , LiAlO 2 : Mn 2+ , LiAl 5 O 8 : Mn 2+ ,
  • Li 2 CaP 2 O 7 Ce 3+ , Mn 2+ , LiCeBa 4 Si 4 O 14 : Mn 2+ , LiCeSrBa 3 Si 4 O 1 : Mn 2+ .
  • Mg 2 Ca (SO 4 ) 3 Eu 2+ , Mn 2 , MgCeAl n O 19 : Tb 3+ , Mg 4 (F) GeO 6 : Mn 2+ ,
  • SrB 4 0 7 Eu 2+ (F, CI, Br), SrB 4 0 7 : Pb 2+ , SrB 4 0 7 : Pb 2+ , Mn 2+ , SrB 8 0 13 : Sm 2+ , Sr x Ba y CI 2 Al 2 O 4- z ⁇ : Mn 2+ , Ce 3+ , SrBaSiO 4 : Eu 2+ , Sr (CI, Br, I) 2 : Eu 2+ in SiO 2 , SrCl 2 : Eu 2+ in Si0 2 , Sr 5 Cl (PO 4 ) 3: Eu, Sr w F x B 4 O 6.5 : Eu 2+ , Sr w F x B y O z : Eu 2+ , Sm 2+ , SrF 2 : Eu 2+ , SrGa 12 O 9 : Mn 2+ , SrGa 2 S 4 : Ce 3+ , SrGa
  • Sr 5 (PO 4 ) 3 F Sb 3+ , Mn 2+ , Sr 5 (PO 4 ) 3 F: Sn 2+ , Sr 2 P 2 O 7 : Sn 2+ , ⁇ -Sr 3 (PO 4 ) 2 : Sn 2+ , ⁇ -Sr 3 (PO 4 ) 2 : Sn 2+ , Mn 2+ (Al), SrS: Ce 3+ , SrS: Eu 2+ , SrS: Mn 2+ , SrS: Cu + , Na , SrS0 4 : Bi, SrS0 4 : Ce 3+ , SrSO 4 : Eu 2+ , SrS0 4 : Eu 2+ , Mn 2+ , Sr 5 Si 4 0 1 oC!
  • Th0 2 Eu 3+
  • Th0 2 Pr 3+
  • Th0 2 Tb 3+
  • YAl 3 B 4 0i 2 Bi 3+
  • YAl 3 B 4 0 12 Ce 3+
  • YAl 3 B 4 O 12 Ce 3+ , Mn
  • YAl 3 B 4 Oi 2 Ce 3+ , Tb 3+
  • YAl 3 B 4 Oi 2 Eu 3+
  • YAl 3 B 4 O 12 Eu 3 ⁇ Cr 3 ⁇ YAI 3 B 4 O 12 : Th + , Ce 3+ , Mn 2+ , YAlO 3 : Ce 3+ , Y 3 Al 5 0 12 : Ce 3+ , Y3AI 5 0 12: Cr 3+, YAlO 3: Eu 3+, Y3AI 5 0 12: Eu 3r, Y4AI 2 0 9: Eu 3+, Y3AI 5 0 12: Mn +, YAI0 3: Sm 3+, YAI0 3: Tb 3+ , Y 3 Al 5 O 2 : Tb 3+ , YAsO 4 : Eu 3+ , YB0 3 : Ce 3+ , YB0 3 : Eu 3+ , YF 3 : Mn 2+ , YF 3 : Mn 2+ , Th + , YF 3 : Tm 3+ , Yb 3+ , (Y
  • YOCI Eu 3 ⁇ YOF: Eu 3+ , YOF: Tb 3+ , Y 2 0 3 : Ho 3+ , Y 2 0 2 S: Eu 3 ⁇ Y 2 0 2 S: Pr 3+ , Y 2 0 2 S Tb 3+ , Y 2 O 3 : Tb 3+ , YPO 4 : Ce 3+ , YPO 4 : Ce 3+ , Tb 3+ , YPO 4 : Eu 3+ ,
  • YPO 4 Mn 2+ , Th + , YPO 4 : V 5+ , Y (P, V) O 4 : Eu, Y 2 SiO 5 : Ce 3+ , YTaO 4 , YTaO 4 : Nb 5+ , YV0 4: Dy 3+, YV0: Eu 3+, ZnAl 2 O 4: Mn z +, ZnB 2 O 4: Mn +, ZnBa 2 S 3: Mn ⁇ +,
  • (Zn, Cd) S Cu, ZnF 2 : Mn 2+ , ZnGa 2 O, ZnGa 2 O 4 : Mn 2+ , ZnGa 2 S: Mn 2+ ,
  • Zn 2 GeO 4 Mn 2+ , (Zn, Mg) F 2 : Mn 2+ , ZnMg 2 (P0 4 ) 2 : Mn 2+ , (Zn, Mg) 3 (PO 4 ) 2 : Mn 2+ , ZnO : Al 3+ , Ga 3+ , ZnO: Bi 3+ , ZnO: Ga 3+ , ZnO: Ga, ZnO-CdO: Ga, ZnO: S, ZnO: Se, ZnO: Zn, ZnS: Ag + , Cl " , ZnS: Ag, Cu, Cl, ZnS.Ag.Ni, ZnS: Au, In, ZnS-CdS (25-75), ZnS-CdS (50-50), ZnS-CdS (75-25), ZnS- CdS: Ag, Br, Ni, ZnS-CdS: Ag + , Cl, ZnS-CdS: Cu, Br, Zn
  • ZnS Te, Mn, ZnS-ZnTe: Mn 2+ , ZnSe: Cu + , Cl or ZnWO 4 .
  • Particularly suitable phosphors which can be combined with the compound according to the invention are the phosphors listed in the table below.
  • the emission-converting material according to the invention is used in a light source.
  • the light source is an LED, in particular a phosphor-converted LED, in short pc-LED.
  • the emission-converting material in addition to the Conversion luminescent material according to the invention comprises at least one further conversion luminescent material, in particular so that the light source emits white light or light with a specific color point (color-on-demand principle).
  • Color-on-demand principle means the realization of light of a particular color point with a pc-LED using one or more conversion phosphors.
  • Another object of the present invention is thus a light source, the primary light source and the emission-converting
  • the emission-converting material in addition to the conversion phosphor according to the invention comprises at least one further conversion luminescent material, so that the light source preferably emits white light or light with a specific color point.
  • the light source according to the invention is preferably a pc-LED.
  • a pc-LED usually contains a primary light source and an emission converting material.
  • the emission-converting material according to the invention can either be dispersed in a resin (for example epoxy or silicone resin) or, with suitable size ratios, directly on the primary light source or, depending on the application, remotely located therefrom (the latter arrangement also includes "Remote Phosphor Technology " with a).
  • the primary light source may be a semiconductor chip, a luminescent light source such as ZnO, a so-called transparent conducting oxide, a ZnSe or SiC based device, an organic light emitting layer based device (OLED), or a plasma or discharge source, most preferably semiconductor chip.
  • a luminescent light source such as ZnO, a so-called transparent conducting oxide, a ZnSe or SiC based device, an organic light emitting layer based device (OLED), or a plasma or discharge source, most preferably semiconductor chip.
  • the primary light source is a semiconductor chip, it is preferably a luminescent indium-aluminum-gallium nitride (InAIGaN), as known in the art.
  • InAIGaN luminescent indium-aluminum-gallium nitride
  • the primary light source When the primary light source emits blue light, it emits
  • Emission converting material prefers green and orange or red light.
  • the emission converting material preferably emits cyan and yellow or orange light, or more preferably blue, green and orange or red light.
  • the emission-converting material according to the invention can be converted for use in light sources, in particular pc LEDs, into any shapes such as spherical particles, platelets and structured materials and ceramics. These forms are summarized under the term "shaped body". Consequently, the moldings are emission-converting moldings. These are another object of the present invention.
  • Yet another object of the invention is a ceramic containing at least one compound of the invention or
  • the ceramic can only consist of the compound according to the invention. But it can also be matrix materials and / or more
  • Phosphors included. Suitable matrix materials are, for example, SiO 2 , Y 2 O 3 or Al 2 O 3 .
  • Another subject of the invention is a lighting unit which contains at least one light source according to the invention.
  • Lighting units are mainly used in display devices, in particular liquid crystal display devices (LC display) with a backlight. Therefore, such a display device is the subject of the present invention.
  • LCD display liquid crystal display devices
  • Coupling between the emission-converting material and the Primary light source also take place by a light-conducting arrangement.
  • the primary light source to be installed at a central location and to be optically coupled to the emission-converting material by means of light-conducting devices, such as, for example, photoconductive fibers.
  • the illumination requirements adapted lights consisting of one or more different conversion phosphors, which may be arranged to a fluorescent screen, and a light guide, which is coupled to the primary light source realize.
  • This makes it possible to place a strong primary light source in a convenient location for the electrical installation and to install without further electrical wiring, only by laying fiber optics at any location, lights of emission-converting materials, which are coupled to the light guide.
  • the compounds emit green or yellow light having a broad emission spectrum and a high quantum efficiency. They are therefore particularly suitable for lighting applications.
  • the compounds are very synthetically accessible.
  • the compounds of the invention comprise a mixture of two or more alkaline earth metals, they can be made energy efficient at a lower calcination temperature.
  • in the synthesis of these compounds can be completely dispensed with the use of a flux. This represents a considerable technical advantage, since the high corrosivity of the flux, in particular of fluorine-containing compounds, makes high technical demands on the process.
  • FIG. 1 X-ray powder diffractogram of SrLuAl1.5Si2.5N5.5O1 5: 0.5%
  • Example 1 (against BaSO 4 as white standard).
  • FIG. 3 Excitation spectrum of SrLuAl1.5Si2.5N5.5O1 5: 0.5% Eu 2+
  • FIG. 5 X-ray powder diffractogram of SrLuAl1.5Si2.5N5.5O1 5: 16%
  • FIG. 6 Emission spectrum of SrLuAl1.5Si2.5N5.5O1 5: 16% Eu 2+
  • FIG. 7 X-ray powder diffractogram of BaLuAI 1.5Si 2.5 N 5.5 O 1.5: 0.5%
  • FIG. 9 X-ray powder diffractogram of BaLuAI 1.5Si 2 .5 N 5 .5 O 1 5: 16%
  • FIG. 10 Emission spectrum of BaLuAli. 5 Si2.5N 5.5 Oi.5: 16% Eu 2+
  • FIG. 11 X-ray powder diffractogram of Sro.9Cao.1LuAlL5Si2.5N5.5O1.5: 1% Eu 2+ from example 5.
  • FIG. 13 X-ray powder diffractogram of Sro.9Bao.1LuAlL5Si2.5N5.5OL5
  • FIG. 15 X-ray powder diffractogram of SrYo.5Luo.5AI1.5Si2.5N5.5O1 5:
  • FIG. 17 X-ray powder diffractogram of FIG :
  • Figure 19 X-ray powder diffractogram of SrLuo.sYo.sAl sS ⁇ .sNs sOi.s:
  • FIG. 21 X-ray powder diffractogram of SrLuo, 75Yo, 25Ali, 5812.5 ⁇ , 501.5:
  • FIG. 23 X-ray powder diffractogram of FIG : 10% Eu 2+ from example 11.
  • FIG. 24 Emission spectrum of BaLuAh, 5 Si 2 , 5N5.5Oi, 5 :10% Eu 2+
  • FIG. 25 X-ray powder diffractogram of SrLuAl 0 , 5Si3.5N 6 , 50o , 5: 10%
  • Figure 27 X-ray powder of Bal_uAlo, 5Si3 i5 N6, 5 0o, 5: 10%
  • FIG. 29 X-ray powder diffraction pattern of SrYAl 3 SiN 4 O 3 : 10% Eu 2+
  • FIG. 30 Emission spectrum of SrYAl 3 SiN 4 O 3 : 10% Eu 2+ from example 14
  • FIG. 31 X-ray powder diffractogram of SrYA 16% Eu 2+ from example 15.
  • FIG. 32 Emission spectrum of SrYAl 1 , 5Si 2 , 5N5 , 5Oi, 5 : 16% Eu 2+
  • FIG. 33 LED spectrum of the LED from Example 17 with the phosphor
  • FIG. 34 LED spectrum of the LED from Example 18 with the phosphor
  • FIG. 35 LED spectrum of the LED from Example 19 with the phosphor Sro.84YSi2.5AI1.5N5.5O1. 5 : Eu 2+ (16%).
  • FIG. 36 LED spectrum of the LED from example 20 with the phosphor
  • FIG. 37 LED spectrum of the LED from Example 21 with the phosphor
  • FIG. 38 LED spectrum of the LED from Example 22 with the phosphor
  • Powder emission spectra are measured by the following general procedure: A phosphor powder bed having a depth of 5 mm, the surface of which is smoothed with a glass slide, is placed in the integration sphere of an Edinburgh Instruments FL 920 fluorescence spectrometer with a xenon lamp as the excitation light source at a wavelength of Irradiated 450 nm and the intensity of the emitted fluorescence radiation in a range of 465 nm to 800 nm in 1 nm steps measured.
  • Example 8 SrLuo ⁇ sYo sAli.sSi ⁇ sNs.sOi.s: ⁇ Eu 2+
  • X-ray powder diffractograms show that the specified compounds are formed in phase-pure form.
  • Example 16 Measurement of the Luminescence Properties of the Phosphors of Examples 1 to 15
  • the thermal quenching TQ is the temperature at which the intensity of the luminescence has decreased by half compared to the luminescence intensity extrapolated to 0 K.
  • the resulting silicone-phosphor mixture is applied by means of an automatic dispenser on the chip of a blue semiconductor LED and cured with heat.
  • the blue semiconductor LEDs used in the present example for the LED characterization have an emission wavelength of 450 nm and are operated at 350 mA current.
  • the light-technical characterization of the LED is carried out with a spectrometer from the company Instrument Systems - spectrometer CAS 140 and an associated integrating sphere ISP 250.
  • the LED is characterized by determining the wavelength-dependent spectral power density.
  • the spectrum thus obtained of the light emitted by the LED is used to calculate the color point coordinates CIE x and y.
  • Example 18 Preparation of a pc-LED using a phosphor of the composition : Eu 2+ (16%) 0.95 g of the phosphor with the composition
  • BaLuAI1.5Si2.5N5.5O1 5: Eu 2+ (16%) from Example 4 are mixed with 9.05 g of an optically transparent silicone and then in a
  • the resulting silicone-phosphor mixture is applied by means of an automatic dispenser on the chip of a near-UV semiconductor LED and cured with heat.
  • the near-UV semiconductor LEDs used in this example for LED characterization have an emission wavelength of 395 nm and are operated at 350 mA current.
  • the light-technical characterization of the LED is carried out with a spectrometer from the company Instrument Systems - spectrometer CAS 140 and an associated integrating sphere ISP 250.
  • the LED is characterized by determining the wavelength-dependent spectral power density.
  • the spectrum thus obtained of the light emitted by the LED is used to calculate the color point coordinates CIE x and y.
  • Example 19 Production of a pc-LED Using a Phosphor of the Composition Sro.8 YSi2.5AI1.sN5.5O1 5: Eu 2+ (16%)
  • Example 15 Sro.84YSi2.5AI1.5N5.5O1.5: Eu 2+ (16%) from Example 15 are weighed, mixed with 8.5 g of an optically transparent silicone and then homogeneously mixed in a planetary centrifugal mixer, so that the phosphor concentration in the total mass 15 wt .-% is.
  • the resulting silicone-phosphor mixture is applied by means of an automatic dispenser on the chip of a near-UV semiconductor LED and cured with heat.
  • the near-UV semiconductor LEDs used in the present example for the LED characterization have an emission wavelength of 395 nm and are operated at 350 mA current.
  • the light-technical characterization of the LED is carried out with a spectrometer from the company Instrument Systems - spectrometer CAS 140 and an associated integrating sphere ISP 250.
  • the LED is characterized by determining the wavelength-dependent spectral power density.
  • the spectrum thus obtained emitted by the LED Light is used to calculate the color point coordinates CIE x and y.
  • Example 20 Preparation of a pc-LED using a phosphor of the composition Sro.oYSiAUOs ⁇ : Eu 2+ (10%)
  • Sro.9 SYSiA 3 0 3 N 4: Eu 2+ (10%) from Example 14 are weighed, mixed with 8.5 g of an optically transparent silicone and then homogeneously mixed in a planetary centrifugal mixer, so that the phosphor concentration in the total mass 15 wt. % is.
  • the resulting silicone-phosphor mixture is applied by means of an automatic dispenser on the chip of a near-UV semiconductor LED and cured with heat.
  • the near-UV semiconductor LEDs used in this example for LED characterization have an emission wavelength of 395 nm and are operated at 350 mA current.
  • the light-technical characterization of the LED is carried out with a spectrometer from the company Instrument Systems - spectrometer CAS 140 and an associated integrating sphere ISP 250.
  • the LED is characterized by determining the wavelength-dependent spectral power density.
  • the spectrum thus obtained of the light emitted by the LED is used to calculate the color point coordinates CIE x and y.
  • Sr0.9LuSi3.5AI0.5O0.5N6 5: Eu 2+ (10%) from Example 12 are weighed, mixed with 8.5 g of an optically transparent silicone and then mixed homogeneously in a planetary centrifugal mixer so that the phosphor concentration in the total mass 15 Wt .-% is.
  • the resulting silicone-phosphor mixture is applied by means of an automatic dispenser on the chip of a near-UV semiconductor LED and cured with heat.
  • the near-UV semiconductor LEDs used in the present example for LED characterization have one
  • the photometric characterization of the LED is done with a Spectrometer from the company Instrument Systems - spectrometer CAS 140 and an associated integrating sphere ISP 250.
  • the LED is characterized by the determination of the wavelength-dependent spectral power density.
  • the spectrum thus obtained of the light emitted by the LED is used to calculate the color point coordinates CIE x and y.
  • Ba0.9LuSi3.5AI0.5O0.5N6 5: Eu 2+ (10%) from Example 13 are weighed, mixed with 8.5 g of an optically transparent silicone and then mixed homogeneously in a planetary centrifugal mixer so that the phosphor concentration in the total mass 15 Wt .-% is.
  • the resulting silicone-phosphor mixture is applied by means of an automatic dispenser on the chip of a near-UV semiconductor LED and cured with heat.
  • the near-UV semiconductor LEDs used in the present example for the LED characterization have an emission wavelength of 395 nm and are operated at 350 mA current.
  • the light-technical characterization of the LED is carried out with a spectrometer from the company Instrument Systems - spectrometer CAS 140 and an associated integrating sphere ISP 250.
  • the LED is characterized by determining the wavelength-dependent spectral power density.
  • the spectrum thus obtained of the light emitted by the LED is used to calculate the color point coordinates CIE x and y.

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Luminescent Compositions (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Led Device Packages (AREA)
  • Planar Illumination Modules (AREA)

Abstract

La présente invention concerne des substances luminescentes dopées à l'europium, un procédé de production de celles-ci et l'utilisation de ces composés comme substances luminescentes de conversion. La présente invention concerne également des dispositifs d'émission de lumière qui contiennent la substance luminescente de l'invention.
EP14739677.4A 2013-08-08 2014-07-09 Substances luminescentes Withdrawn EP3031302A1 (fr)

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EP14739677.4A EP3031302A1 (fr) 2013-08-08 2014-07-09 Substances luminescentes
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CN104910913B (zh) * 2015-06-08 2017-07-18 北京科技大学 一种自发光黄绿色荧光粉及其制备方法
CN105542770A (zh) * 2015-11-20 2016-05-04 安徽建筑大学 一种荧光材料及其制造方法
KR102486988B1 (ko) * 2017-09-22 2023-01-10 삼성디스플레이 주식회사 발광 소자 및 이를 포함하는 표시 장치
CN110922969B (zh) * 2019-11-27 2022-09-06 五邑大学 氮氧化物蓝色荧光粉、制备方法及具有其的发光器件
CN110872515A (zh) * 2019-11-27 2020-03-10 五邑大学 氮氧化物绿色荧光粉、制备方法及具有其的发光器件
CN112920801B (zh) * 2021-02-09 2022-07-12 上海应用技术大学 一种红光荧光粉材料及其制备方法
DE102024104050A1 (de) * 2024-02-14 2025-08-14 Ams-Osram International Gmbh Leuchtstoff, optoelektronisches bauelement, verfahren zur herstellung eines leuchtstoffs

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US9745511B2 (en) 2017-08-29
TW201512101A (zh) 2015-04-01

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