Phosphor Composition

Patent metadata

Field	Value
Publication number	US-2016348000-A1
Application number	US-201615234433-A
Country	US
Kind code	A1
Filing date	Aug 11, 2016
Priority date	Nov 17, 2008
Publication date	Dec 1, 2016
Grant date	—

Abstract

A method is disclosed for forming a blended phosphor composition. The method includes the steps of firing precursor compositions that include europium and nitrides of at least calcium, strontium and aluminum, in a refractory metal crucible and in the presence of a gas that precludes the formation of nitride compositions between the nitride starting materials and the refractory metal that forms the crucible. The resulting compositions can include phosphors that convert frequencies in the blue portion of the visible spectrum into frequencies in the red portion of the visible spectrum.

First claim

1 . A phosphor composition comprising:
Ca 1-x-y Sr x Eu y AlSiN 3 , where 0<x<1 and 0<y<1; and silicon oxynitride in an amount of at least 1% by weight.

2 . The phosphor composition of claim 1 , wherein the silicon oxynitride comprises silicon aluminum oxynitride.

3 . The phosphor composition of claim 2 , wherein the silicon aluminum oxynitride comprises Si 2 Al 4 O 4 N 4 .

4 . The phosphor composition of claim 1 , wherein x is between 0.50 and 0.70.

5 . The phosphor composition of claim 4 , wherein x is between about 0.55 and 0.67.

6 . The phosphor composition of claim 1 , wherein y is between about 0.013 and 0.017.

7 . The phosphor composition of claim 1 , further comprising aluminum nitride.

8 . The phosphor composition of claim 1 that absorbs frequencies of between about 430 and 480 nanometers and emits peak frequencies of between about 530 and 750 nanometers.

9 . A phosphor composition comprising:
a first phase comprising Ca 1-x-y Sr x Eu y AlSiN 3 , where 0<x<1 and 0<y<1; and a second phase comprising silicon aluminum oxynitride.

10 . The phosphor composition of claim 9 , wherein the silicon aluminum oxynitride comprises Si 2 Al 4 O 4 N 4 .

11 . The phosphor composition of claim 9 , wherein the silicon aluminum oxynitride is present in an amount of at least 1% by weight.

12 . The phosphor composition of claim 9 , further comprising a third phase comprising aluminum nitride.

13 . The phosphor composition of claim 9 , wherein x is between 0.50 and 0.70.

14 . The phosphor composition of claim 13 , wherein x is between about 0.55 and 0.67.

15 . The phosphor composition of claim 9 , wherein y is between about 0.013 and 0.017.

16 . The phosphor composition of claim 9 that absorbs frequencies of between about 430 and 480 nanometers and emits peak frequencies of between about 530 and 750 nanometers.

Assignees

• Cree Inc

Inventors

• Collins Brian T
• Hussell Christopher P
• Emerson David T
• Le Toquin Ronan P

Classifications

• C09K11/77348 Primary

  Silicon Aluminium Nitrides or Silicon Aluminium Oxynitrides · CPC title

• C04B35/58 Primary

  based on borides, nitrides, {i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides} or silicides {(containing free binder metal C22C29/00)} · CPC title

• C09K11/08 Primary

  containing inorganic luminescent materials · CPC title

• C04B2235/3865

  Aluminium nitrides · CPC title

• C09K11/0883

  Arsenides; Nitrides; Phosphides · CPC title