Method for producing phosphor
US-2015307353-A1 · Oct 29, 2015 · US
Method for producing phosphor
US9850131B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9850131-B2 |
| Application number | US-201314434162-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 22, 2013 |
| Priority date | Oct 9, 2012 |
| Publication date | Dec 26, 2017 |
| Grant date | Dec 26, 2017 |
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Abstract
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Provided is a method for producing a phosphor, using a nitride raw material, that gives a high-reliability (Sr,Ca)AlSiN 3 -based nitride phosphor at a productivity higher than before. The method comprises a mixing step of mixing raw materials and a calcining step of calcining the mixture obtained in the mixing step and, in producing the phosphor having a crystalline structure substantially identical with that of (Sr,Ca)AlSiN 3 crystal as the host crystal, a strontium nitride containing SrN, Sr 2 N, or the mixture thereof as the main crystalline phase, as determined by crystalline phase analysis by powder X-ray diffractometry, and having a nitrogen content of 5 to 12 mass % is used as part of the raw materials.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method for producing a phosphor, the host crystal thereof having a crystal structure substantially identical with that of (Sr,Ca)AlSiN 3 crystal, comprising: a mixing step of mixing raw materials; and a calcining step of calcining the mixture of the mixed raw materials under a temperature condition of 1500 to 1900° C. in nitrogen atmosphere, wherein the raw materials contain a strontium nitride powder, the strontium nitride powder has a nitrogen content of 5 to 12 mass %, an oxygen content of 0.2 to 1 mass %, and a maximum diameter of 77 to 300 μm, and the strontium nitride powder comprises SrN, Sr 2 N, or the mixture thereof as determined by crystalline phase analysis by powder X-ray diffractometry. 2. The method for producing a phosphor according to claim 1 , further comprising, before the mixing step, a classifying step of reducing the maximum diameter of the strontium nitride, part of the raw material, to 300 μm or less. 3. The method for producing a phosphor according to claim 1 , wherein the raw materials, further comprise a calcium nitride powder, a silicon nitride powder, an aluminum nitride powder, and a europium compound powder.
Assignees
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Classifications
Silicates · CPC title
with one or more rare earth metals · CPC title
Silicon aluminium oxynitrides, i.e. sialons · CPC title
Solid solutions · CPC title
by d-values or two theta-values, e.g. as X-ray diagram · CPC title
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- What does patent US9850131B2 cover?
- Provided is a method for producing a phosphor, using a nitride raw material, that gives a high-reliability (Sr,Ca)AlSiN 3 -based nitride phosphor at a productivity higher than before. The method comprises a mixing step of mixing raw materials and a calcining step of calcining the mixture obtained in the mixing step and, in producing the phosphor having a crystalline structure substantially iden…
- Who is the assignee on this patent?
- Denki Kagaku Kogyo Kk, Denka Company Ltd
- What technology area does this patent fall under?
- Primary CPC classification C01B21/082. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Dec 26 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).