WO2008052772A1 - Lichtquelle - Google Patents
Lichtquelle Download PDFInfo
- Publication number
- WO2008052772A1 WO2008052772A1 PCT/EP2007/009471 EP2007009471W WO2008052772A1 WO 2008052772 A1 WO2008052772 A1 WO 2008052772A1 EP 2007009471 W EP2007009471 W EP 2007009471W WO 2008052772 A1 WO2008052772 A1 WO 2008052772A1
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- WO
- WIPO (PCT)
- Prior art keywords
- light source
- phosphor
- primary radiation
- precursor
- source according
- Prior art date
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- 230000005855 radiation Effects 0.000 claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 43
- 239000002243 precursor Substances 0.000 claims description 32
- 239000012190 activator Substances 0.000 claims description 31
- 239000000463 material Substances 0.000 claims description 22
- 229910052757 nitrogen Inorganic materials 0.000 claims description 17
- 238000000197 pyrolysis Methods 0.000 claims description 14
- 229910052710 silicon Inorganic materials 0.000 claims description 14
- 229910052782 aluminium Inorganic materials 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 12
- 229910052698 phosphorus Inorganic materials 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 9
- 239000007787 solid Substances 0.000 claims description 7
- RVNZEJNWTUDQSC-JOCHJYFZSA-N (2r)-n-(6-aminohexyl)-1-tridecanoylpyrrolidine-2-carboxamide Chemical compound CCCCCCCCCCCCC(=O)N1CCC[C@@H]1C(=O)NCCCCCCN RVNZEJNWTUDQSC-JOCHJYFZSA-N 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 239000000725 suspension Substances 0.000 claims description 4
- 229910052693 Europium Inorganic materials 0.000 claims description 3
- 229910052788 barium Inorganic materials 0.000 claims description 3
- 238000003618 dip coating Methods 0.000 claims description 3
- 229910052684 Cerium Inorganic materials 0.000 claims description 2
- 229910052692 Dysprosium Inorganic materials 0.000 claims description 2
- 229910052691 Erbium Inorganic materials 0.000 claims description 2
- 229910052689 Holmium Inorganic materials 0.000 claims description 2
- 229910052779 Neodymium Inorganic materials 0.000 claims description 2
- 229910052777 Praseodymium Inorganic materials 0.000 claims description 2
- 229910052772 Samarium Inorganic materials 0.000 claims description 2
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 2
- 229910006404 SnO 2 Inorganic materials 0.000 claims description 2
- 229910052771 Terbium Inorganic materials 0.000 claims description 2
- 229910052775 Thulium Inorganic materials 0.000 claims description 2
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 2
- 229910052769 Ytterbium Inorganic materials 0.000 claims description 2
- GEIAQOFPUVMAGM-UHFFFAOYSA-N ZrO Inorganic materials [Zr]=O GEIAQOFPUVMAGM-UHFFFAOYSA-N 0.000 claims description 2
- 229910052787 antimony Inorganic materials 0.000 claims description 2
- 229910052745 lead Inorganic materials 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 238000004528 spin coating Methods 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 229910052718 tin Inorganic materials 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- YPSXFMHXRZAGTG-UHFFFAOYSA-N 4-methoxy-2-[2-(5-methoxy-2-nitrosophenyl)ethyl]-1-nitrosobenzene Chemical compound COC1=CC=C(N=O)C(CCC=2C(=CC=C(OC)C=2)N=O)=C1 YPSXFMHXRZAGTG-UHFFFAOYSA-N 0.000 claims 1
- 239000000126 substance Substances 0.000 abstract description 4
- 238000001429 visible spectrum Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 22
- 229910052796 boron Inorganic materials 0.000 description 15
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 12
- 229920000642 polymer Polymers 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 238000005915 ammonolysis reaction Methods 0.000 description 8
- 239000000945 filler Substances 0.000 description 8
- 239000011159 matrix material Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 5
- 229910021529 ammonia Inorganic materials 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 3
- 239000012298 atmosphere Substances 0.000 description 3
- 125000004429 atom Chemical group 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 230000003595 spectral effect Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000000149 argon plasma sintering Methods 0.000 description 2
- 150000001805 chlorine compounds Chemical class 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 150000004820 halides Chemical class 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000003446 ligand Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000006068 polycondensation reaction Methods 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 150000001408 amides Chemical class 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000005090 crystal field Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- OGPBJKLSAFTDLK-UHFFFAOYSA-N europium atom Chemical compound [Eu] OGPBJKLSAFTDLK-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- -1 phosphorus halide Chemical class 0.000 description 1
- 239000000047 product Substances 0.000 description 1
Classifications
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- 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, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent 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, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/0883—Arsenides; Nitrides; Phosphides
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
- C04B35/583—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on boron nitride
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
- C04B35/584—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon nitride
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- 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, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
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- 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
- F21K2/00—Non-electric light sources using luminescence; Light sources using electrochemiluminescence
- F21K2/06—Non-electric light sources using luminescence; Light sources using electrochemiluminescence using chemiluminescence
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3232—Titanium oxides or titanates, e.g. rutile or anatase
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3244—Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3293—Tin oxides, stannates or oxide forming salts thereof, e.g. indium tin oxide [ITO]
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B2235/444—Halide containing anions, e.g. bromide, iodate, chlorite
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9646—Optical properties
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
- H01L33/502—Wavelength conversion materials
Definitions
- the invention relates to a light source comprising a primary radiation source and a phosphor and a method for producing such a light source.
- the invention relates to a method for producing an electric light source using one or more phosphors emitting in the visible spectral range and at least one preferably UV-emitting primary source which is preferably, but not exclusively, an LED.
- Light sources based on at least one LED are realized by combining a UV-emitting primary source and one or more phosphors, which are excited by the UV light of the primary source and emit in the visible spectral range.
- a Ga (In) N LED emitting at about 460 nm and a yellow emitting phosphor YAG: Ce 3+ (WO 98/12757) are used. If a purely white light source is desired, several different phosphors, usually one each red, green and blue emitting material, must be used. This must be set according to the prior art to an optimal particle size and usually provided with a transparent protective layer.
- An object of the present invention was therefore to overcome the above-described disadvantages of the prior art and, in particular, to provide a light source which can be manufactured in a simple manner and which enables the emission of white light.
- This object is achieved according to the invention by a light source comprising (i) a primary radiation source and (ii) a phosphor layer or a phosphor based on an amorphous or partially crystalline network, wherein the network comprises nitrogen (N) and at least two elements selected from P Si 1 B and Al, and wherein at least one activator is incorporated into the network.
- the light source according to the invention comprises as component (i) a primary radiation source.
- This primary radiation source can basically emit light in any wavelength range. It preferably delivers UV-o radiation, in particular in a wavelength range from 250 to 450 nm, more preferably from 300 to 430 nm. Particularly preferred is a peak maximum of the emission of the primary radiation source in the specified ranges.
- the primary radiation source is an LED (light-emitting diode), in particular a GaN or Ga (In) N LED.
- the light emitted by the primary radiation source is also referred to herein as primary radiation.
- the light source according to the invention comprises a phosphor layer or a phosphor based on an amorphous or partially crystalline network, wherein the network comprises N and at least two elements selected from P, Si, B and Al, and wherein at least one Activator is incorporated.
- the phosphors used according to the invention are distinguished, in particular, by the fact that they are not substances based on a crystalline network, but rather substances based on an amorphous or partially crystalline network.
- the base materials used to form the phosphor have networks which are particularly X-ray amorphous, that is, they do not have crystallites with a diameter of ⁇ 300 nm, especially no crystallites with a diameter> 200 nm, and more preferably no crystallites with a diameter ⁇ 100 nm.
- the base material of the phosphors thus has in particular no long-range lattice symmetry.
- at least one activator is further incorporated in the phosphors.
- the base material of the phosphors according to the invention comprises at least two elements selected from P, Si, B, Al and, independently of this, always N.
- the network consists of the elements P, Si, B, Al and N or the respective subsystems P, Si, B and N, P, Si, Al and N, Si, B 1 Al and N, P, B, Al and N, P, Si and N, P, B and N, P , Al and N, Si, B and N, Si, Al and N or B 1 Al and N.
- suitable activators are incorporated and incorporated.
- any metal ions can be introduced into the inorganic amorphous or partially crystalline network as activators.
- Preferred activator elements are Ba, Zn, Mn, Eu, Ce, Pr, Nd, Sm, Tb, Dy, Ho, Er, Tm, Yb, Sn, Sb, Pb or Bi.
- the activators are Mn 2+ , Zn 2+ , Ba 2+ , Ce 3+ , Nd 3+ , Eu 2+ , Eu 3+ , Gd 3+ , Tb 3+ , Sn 2+ , Sb 3+ , Pb 2+ or Bi 3+ .
- the amount of activators in the phosphor is preferably ⁇ 0.1% by weight, in particular ⁇ 0.5% by weight and preferably up to 14% by weight, in particular up to 5% by weight.
- the activators may also have a sensitizer function.
- the phosphor preferably emits at wavelengths between 480 and 740 nm.
- the phosphor absorbs the primary radiation as completely as possible.
- the emitted light of the phosphor has different wavelengths from the absorbed light. Since according to the invention there is no exchange, but rather an introduction of the activator elements, it is also possible for any desired combinations of activator elements to be introduced into the luminescent material, thereby in particular coordinating the emission colors as desired. Most preferably, the activators are combined to emit white light.
- the incorporation of suitable activators into an amorphous three-dimensional network of the composition Si / B / N is particularly preferred.
- This host material has no periodic lattice symmetry.
- the base material structure is preferably nitridic in nature, which may optionally be doped oxide.
- the phosphor or the phosphor layer may further contain fillers.
- fillers Preference is given to solid particles as fillers, which at the same time act as light scattering agents.
- Such solid particles are, for example, SiO 2 , TiO 2 , SnO 2 , ZrO 2 , HfO 2 and / or Ta 2 O 5 .
- the solid particles Preferably, the solid particles have a narrow particle size distribution, wherein the average particle size distribution is preferably chosen depending on the refractive indices of the respective material such that white light is optimally scattered.
- the layer thickness of the phosphor or of the phosphor layer is preferably between 200 and 3000 nm, in particular between 300 and 2000 nm.
- the phosphor layer may be in direct contact with the primary radiation source, i. be applied directly to the primary radiation source.
- the phosphor layer in indirect contact with the primary radiation source, that is to say that further materials or layers are arranged between the primary radiation source and the phosphor layer.
- the intermediate layers or intermediate materials for the primary radiation are completely permeable.
- the invention further relates to a method for producing a light source as described herein, which is characterized in that a phosphor precursor in liquid form or as a suspension is applied directly or indirectly to a primary radiation source and then cured.
- the invention provides a method of liquid-phase coating a primary source having a phosphor emitting in the visible spectral range.
- the inventive method is based on a new family of phosphors consisting of an amorphous matrix, in which all conceivable activators can be introduced in widely variable concentrations. This very advantageous feature is brought about by incorporating the activators non-substitutively, that is to say replacing a matrix atom, but rather additively.
- This new class of phosphors is obtained from molecular precursors via an oligomeric or polymeric intermediate and the final step of pyrolysis.
- the molecular precursors with the activators dissolved therein or the partially crosslinked preceramic oligomers are liquid, they can be applied for example by dip coating (dipcoating), spin coating or spray coating, then fully crosslink by heating in an ammonia atmosphere and transfer by pyrolysis in 5 a firmly adhering ceramic layer.
- a mixture of at least one molecular precursor, at least one activator and optionally fillers is formed and applied to the primary source. Subsequently, a curing takes place, in particular by ammonolysis and subsequent pyrolysis.
- the viscosity of the mixture to be applied to the primary source can be adjusted by the nature and content of the fillers.
- a mixture of at least one molecular precursor, at least one activator and optionally fillers is also applied to the primary source, but this mixture was first subjected to partial curing, for example, partial ammonolysis to adjust the viscosity to the desired value , Subsequently, the application to the primary source and subsequently the complete curing, for example by ammonolysis and pyrolysis.
- a preceramic polymer is first formed from the 5 molecular precursors, the activators and optionally fillers. This preceramic polymer is obtained, for example, by complete ammonolysis. This preceramic polymer is then applied to the primary source. Liquid preceramic polymers can be applied directly. If the preceramic polymer is resinous or solid, a finely divided suspension of the preceramic polymer is advantageously formed in a solvent and this suspension is applied to the primary source. The solvent is then evaporated and then the phosphor layer cured, for example by pyrolysis.
- the base material of the phosphors used according to the invention is accessible, in particular, via molecular precursors, which are processed to form a preceramic material, which is then converted by pyrolysis into the final ceramic state.
- the phosphor can be applied to the radiation source in the form of a molecular precursor or can be formed from a molecular precursor.
- the molecular precursors contain the elements of the base material, ie in particular at least two elements, preferably at least three elements selected from P, Si 1 B and Al.
- the concentrations of P 1 Si, B, Al are preferably each set between 0 and 100 atom%, more preferably between 10 and 80 atom%.
- the molecular precursors are halides, preferably chlorides.
- molecular precursors in particular a mixture of molecular precursors, which are then subjected to co-ammonolysis.
- Mixtures of molecular precursors can be obtained, for example, by mixing a silazane and a boron and / or phosphorus halide.
- a molecular precursor is used, which is a one-component precursor.
- a one-component precursor already contains all elements of the product.
- Particularly preferred as the starting point of the production Molecular compound CI 3 Si (NH) BCI 2 (TADB) is used, which already contains the desired end-product linkage Si-NB.
- More preferred molecular component precursors are CI 4 P (N) (BCI 2) SiCl 3, Cl 3 PNSiCI 3, (CI 3 Si) 2 NBCI 2, CI 3 SiN (BCI 2) 2, (H 3 Si) 2 NBCI 2, CI 3 Si (NH) (BCI) (NH) SiCl 3 , CI 3 Si (NH) (AICI) (NH) SiCl 3 , [(CI 3 Si) (NH) (BNH) I 3 , (CI 3 Si ( NH) AICIz) 2 or [CI 3 PN (PCI 2 ) ZN] + [AICI 4 ] -.
- the precursor material is then cured to a phosphor having an amorphous or partially crystalline network.
- Curing preferably takes place via the intermediate stage of a preceramic material.
- the phosphor precursors can by
- Nitrogen can be partially replaced by oxygen, whereby an oxide doping is obtained.
- phosphor layer activators are incorporated, which are preferably introduced via the following routes.
- Those metals which dissolve like europium or barium in liquid ammonia are presented as dissolved in liquid ammonia and the molecular precursor, e.g. TADB, is added dropwise.
- the solution of the metals in ammonia can also be converted into precursors, e.g. TADB, to be dripped.
- the resulting polymeric imidamide contains, besides the base material elements, e.g. in addition to silicon and boron, the or the activator elements homogeneously distributed.
- Activators that do not dissolve elementally in liquid ammonia can be incorporated as complex molecular compounds.
- the ligands used should preferably contain only system-inherent elements such as halide (chloride), hydrogen, silicon or boron. AIIe other elements would not be removed or only with additional effort from the final product.
- Particularly suitable and system compatible are metal complexes with, for example, [CI 3 Si (N) SiCl 3 ] ' and chloride as ligands. Since all metals that can be used as activators form binary chlorides from which the desired complexes can be prepared by reaction with Li [CI 3 Si (N) SiCl 3 ], this approach is universal.
- the complex compounds of the activators are dissolved in the molecular precursor, for example in TADB, or, if appropriate, are dissolved together with the molecular precursor, for example with TADB 1, in a suitable solvent. This mixture or solution is added dropwise for the purpose of ammonolysis in liquid ammonia, and this can also be done in the opposite way.
- the thickness of the polymer / oligomer layer can be adjusted via the viscosity of the solution and the parameters of the coating process.
- the viscosity in turn, can be determined by the degree of polycondensation, i. be adjusted specifically by the average molecular weight of the oligomer, by the addition of solvents, by the addition of fillers and / or by the temperature.
- fillers preferably materials are used, which act at the same time light scattering.
- SiO.sub.2, TiO.sub.2, ZrO.sub.2, SnO.sub.2 or Ta.sub.2O.sub.5 having a narrow particle size distribution can be values which, depending on the calculation index of the respective material, optimally diffuse white light.
- the layer thicknesses are adjusted so that a crack-free ceramic layer is formed during pyrolysis.
- the layer thicknesses are preferably between 200 and 3000 nm, more preferably between 300 and 2000 nm.
- the layer thickness which can be achieved in a coating process depends essentially on the viscosity of the mixture to be applied and on the application method. If necessary for optimum optical performance of the LED-based light source, the entire coating process may be repeated several times to obtain the desired layer thickness.
- the final curing to the phosphor or to the phosphor layer is preferably carried out by pyrolysis, wherein an amorphous or partially crystalline Network is formed.
- pyrolysis the preceramic amide obtained as an intermediate in the ammonolysis at temperatures between 600 0 C and 1500 0 C, preferably between 1000 0 C and 1300 0 C, transferred to the final product.
- the pyrolysis preferably takes place in an atmosphere comprising nitrogen, argon, ammonia or mixtures thereof.
- the applied layer is cured in an ammonia atmosphere at room temperature to 200 0 C. Thereafter, the temperature is gradually increased, for example to 620 ° C, and held at this temperature. Subsequently, a pyrolysis, for example, is carried out at 1050 0 C.
- the heating elements can be electrical resistance furnaces or preferably infrared heaters, Spiegelöfen or lasers are used.
- the entire coating process can be carried out in parallel and continuously (flow-band-like).
- the LEDs to be coated can be processed in parallel in a 100 ⁇ 80 matrix arrangement. Different durations of the individual process steps are compensated for at the same running speed by longer or parallel running distances.
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- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Structural Engineering (AREA)
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- Physics & Mathematics (AREA)
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- General Engineering & Computer Science (AREA)
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Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07819503A EP2087064A1 (de) | 2006-11-02 | 2007-10-31 | Lichtquelle |
CN2007800403674A CN101528891B (zh) | 2006-11-02 | 2007-10-31 | 光源 |
JP2009535024A JP5328657B2 (ja) | 2006-11-02 | 2007-10-31 | 光源 |
US12/513,465 US8339032B2 (en) | 2006-11-02 | 2007-10-31 | Light source with luminophore layer |
Applications Claiming Priority (2)
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DE102006051756.3 | 2006-11-02 | ||
DE102006051756A DE102006051756A1 (de) | 2006-11-02 | 2006-11-02 | Lichtquelle |
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WO2008052772A1 true WO2008052772A1 (de) | 2008-05-08 |
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ID=38786858
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PCT/EP2007/009471 WO2008052772A1 (de) | 2006-11-02 | 2007-10-31 | Lichtquelle |
Country Status (7)
Country | Link |
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US (1) | US8339032B2 (de) |
EP (1) | EP2087064A1 (de) |
JP (1) | JP5328657B2 (de) |
KR (1) | KR20090087899A (de) |
CN (1) | CN101528891B (de) |
DE (1) | DE102006051756A1 (de) |
WO (1) | WO2008052772A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN102159665A (zh) * | 2008-09-15 | 2011-08-17 | 马普科技促进协会 | 氮化物基荧光体的制备 |
Families Citing this family (3)
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JP2011238778A (ja) * | 2010-05-11 | 2011-11-24 | Konica Minolta Opto Inc | 波長変換素子の製造方法、波長変換素子および発光装置 |
DE102014107473A1 (de) * | 2014-05-27 | 2015-12-03 | Osram Opto Semiconductors Gmbh | Konverterelement zur Konvertierung einer Wellenlänge, optoelektronisches Bauelement mit Konverterelement und Verfahren zum Herstellen eines Konverterelements |
WO2020183618A1 (ja) * | 2019-03-12 | 2020-09-17 | 日立化成株式会社 | 波長変換部材、バックライトユニット、画像表示装置及び波長変換用樹脂組成物 |
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- 2007-10-31 US US12/513,465 patent/US8339032B2/en not_active Expired - Fee Related
- 2007-10-31 EP EP07819503A patent/EP2087064A1/de not_active Withdrawn
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- 2007-10-31 JP JP2009535024A patent/JP5328657B2/ja not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
JP5328657B2 (ja) | 2013-10-30 |
US8339032B2 (en) | 2012-12-25 |
KR20090087899A (ko) | 2009-08-18 |
DE102006051756A1 (de) | 2008-05-08 |
JP2010508665A (ja) | 2010-03-18 |
CN101528891B (zh) | 2012-09-12 |
EP2087064A1 (de) | 2009-08-12 |
US20100067215A1 (en) | 2010-03-18 |
CN101528891A (zh) | 2009-09-09 |
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