Phosphor Ceramics and Methods of Making the Same
US-2015069299-A1 · Mar 12, 2015 · US
Color stable red-emitting phosphors
US9698314B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9698314-B2 |
| Application number | US-201414208592-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 13, 2014 |
| Priority date | Mar 15, 2013 |
| Publication date | Jul 4, 2017 |
| Grant date | Jul 4, 2017 |
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Abstract
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A process for synthesizing a color stable Mn 4+ doped phosphor includes contacting a precursor of formula I, in gaseous form at an elevated temperature with a fluorine-containing oxidizing agent to form the color stable Mn 4+ doped phosphor A x [MF y ]:Mn 4+ I wherein A is Li, Na, K, Rb, Cs, NR 4 or a combination thereof; M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Hf, Y, La, Nb, Ta, Bi, Gd, or a combination thereof; R is H, lower alkyl, or a combination thereof; x is the absolute value of the charge of the [MF y ] ion; and y is 5, 6 or 7.
First claim
Opening claim text (preview).
The invention claimed is: 1. A lighting apparatus comprising a semiconductor light source; and a color stable Mn 4+ doped phosphor of formula K 2 SiF 6 :Mn 4+ , wherein % intensity loss of the phosphor after exposure to light flux of at least 80 w/cm 2 at a temperature of at least 50° C. for at least 21 hours is ≦4%. 2. A lighting apparatus according to claim 1 , wherein % intensity loss of the phosphor is ≦3%. 3. A lighting apparatus according to claim 1 , wherein % intensity loss of the phosphor is ≦1%. 4. A backlight device comprising a semiconductor light source; and a color stable Mn 4+ doped phosphor of formula K 2 SiF 6 :Mn 4+ , wherein % intensity loss of the phosphor after exposure to light flux of at least 80 w/cm 2 at a temperature of at least 50° C. for at least 21 hours is ≦4%. 5. A backlight device according to claim 4 , wherein % intensity loss of the phosphor is ≦3%. 6. A backlight device according to claim 4 , wherein % intensity loss of the phosphor is ≦1%. 7. A color stable Mn 4+ doped phosphor of formula K 2 SiF 6 :Mn 4+ , wherein % intensity loss of the phosphor after exposure to light flux of at least 80 w/cm 2 at a temperature of at least 50° C. for at least 21 hours is ≦4%. 8. A color stable Mn 4+ doped phosphor according to claim 7 , wherein the % intensity loss of the phosphor is ≦3%. 9. A color stable Mn 4+ doped phosphor according to claim 7 , wherein the % intensity loss of the phosphor is ≦1.5%.
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between a chip and a stacked lead frame, conducting package substrate or heat sink · CPC title
Encapsulations, e.g. protective coatings · CPC title
with alkali or alkaline earth metals · CPC title
with alkali or alkaline earth metals · CPC title
- C09K11/616Primary
with alkali or alkaline earth metals · CPC title
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- What does patent US9698314B2 cover?
- A process for synthesizing a color stable Mn 4+ doped phosphor includes contacting a precursor of formula I, in gaseous form at an elevated temperature with a fluorine-containing oxidizing agent to form the color stable Mn 4+ doped phosphor A x [MF y ]:Mn 4+ I wherein A is Li, Na, K, Rb, Cs, NR 4 or a combination thereof; M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Hf, Y, La, N…
- Who is the assignee on this patent?
- Gen Electric
- What technology area does this patent fall under?
- Primary CPC classification C09K11/616. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jul 04 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).