Osram Opto Semiconductors Gmbh

Koninklijke Philips Corporation N.v.

Osram Gmbh

Osram Oled Gmbh

Juliane Kechele

Bianca Pohl-Klein

Daniel Bichler

Sonja Tragl

Simon Dallmeir

Peter Josef Schmidt

Walter Mayr

Stefan Lange

Joerg Meyer

Madis Raukas

Yi Zheng

Wolfgang Schnick

Johanna Strube-Knyrim

Oliver Michael Oeckler

Wavelength converters including coarse particles/grains of a red nitride phosphor are disclosed. In some embodiments the red nitride phosphor is a (Ca,Sr,Ba)SiN:Eu phosphor with a D50 grain size or a D50 particle size that is &#x2265;5 microns. The red nitride phosphor may be encapsulated within an organic matrix or present in an inorganic matrix. In the latter case, the inorganic matrix may include fine grains with a D50 grain size &#x3c;5 microns. Methods of making such wavelength converters and devices including such wavelength converters are also described.

Stable red ceramic phosphors and technologies including the same

A method is provided for producing a pulverulent precursor material of the general formula M1M2(Si,Al)(O,N)or M1M2SiAlNhaving the method steps A) producing a pulverulent mixture of starting materials, B) calcining the mixture under a protective gas atmosphere and subsequent grinding, wherein in method step A) at least one nitride with a specific surface area of greater than 2 m/g is selected as starting material. A pulverulent precursor material and the use thereof are additionally provided.

Method for producing a powdered precursor material, powdered precursor material and use thereof

A method can be used for producing a powdery precursor material for an optoelectronic component having a first phase of the following general composition (CaZnMgSrBaX)SiN, wherein X is an activator that is selected from the group of the lanthanoids and wherein the following applies: 0&#x3c;a&#x3c;1 and 0&#x2266;b&#x2266;1 and 0&#x2266;c&#x2266; and 0&#x2266;d&#x2266;1 and 0&#x2266;e&#x2266;1. The method includes producing a powdery mixture of starting materials. The starting materials comprise ions of the aforementioned composition. At least silicon nitride having a specific surface area greater than or equal to 9 m/g is selected as a starting material and wherein the silicon nitride comprises alpha silicon nitride or is amorphous. The method also includes heat-treating the mixture under a protective gas atmosphere.

Method for producing a pulverulent precursor material, pulverulent precursor material, and use of pulverulent precursor material

A method can be used for producing a powdery precursor material of the following general composition I or II or III or IV: I: (CaSr) AlSiN:X1 II:(CaSrLi) AISi (NF)3:X2 III: ZAlSiN: X3 IV: (ZLi)AlSi(NF): X4. The method includes A) producing a powdery mixture of starting materials, wherein the starting materials comprise ions of the aforementioned compositions I and/or II and/or III and/or IV, B) annealing the mixture under a protective gas atmosphere, subsequent milling. In method step A), at least one silicon nitride having a specific area of greater than or equal to 5 m/g and smaller than or equal to 100 m/g is selected as starting material. The annealing in method step B) is carried out at a temperature of less than or equal to 1550&#xb0; C.

Method for producing a powdery precursor material, powdery precursor material and use thereof

The invention relates to a light emitting device, especially a LED comprising a green emitting material of the composition SrMSiAlON:Eu:Ce. This material has been found to have a narrow emission in the green wavelight range together with a good producibility and stability.

Light emitting device comprising a green emitting sialon-based material

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Stadtbergen, Germany

Juliane Kechele