Alkaline and alkaline earth metal phosphate halides and phosphors
View Patent ↗Compounds, phosphor materials and apparatus related to nacaphite family of materials are presented. Potassium and rubidium based nacaphite family compounds and phosphors designed by doping divalent rare earth elements in the sites of alkaline earth metals in the nacaphite material families are descried. An apparatus comprising the phosphors based on the nacaphite family materials are presented herein. The compounds presented is of formula A 2 B 1-y R y PO 4 X where the elements A, B, R, X and suffix y are defined such that A is potassium, rubidium, or a combination of potassium and rubidium and B is calcium, strontium, barium, or a combination of any of calcium, strontium and barium. X is fluorine, chlorine, or a combination of fluorine and chlorine, R is europium, samarium, ytterbium, or a combination of any of europium, samarium, and ytterbium, and y ranges from 0 to about 0.1.
1. A compound of formula A 2 B 1-y R y PO 4 X, wherein
A is potassium, rubidium, or a combination thereof;
B is calcium, strontium, barium, or a combination thereof;
X is fluorine, chlorine, or a combination thereof;
R is europium, samarium, ytterbium, or a combination thereof; and
y ranges from 0 to about 0.1.
2. The compound of claim 1 , wherein B is calcium or a combination of calcium and strontium.
3. The compound of claim 1 , wherein X is fluorine or a combination of fluorine and chlorine.
4. The compound of claim 1 , selected from the group consisting of K 2 CaPO 4 F, K 2 (Ca,Sr)PO 4 F, K 2 CaPO 4 (F,Cl), Rb 2 CaPO 4 F, Rb 2 (Ca,Sr)PO 4 F, Rb 2 CaPO 4 (F,Cl), Rb 2 Ca 1-y Eu y PO 4 F, K 2 Ca 1-y Eu y PO 4 F, K 2 Ca 1-y Eu y PO 4 Cl, and K 2 Ca 1-y Eu y PO 4 (F,Cl), wherein y ranges from about 0.005 to about 0.05.
5. The compound of claim 1 , of formula K 2 CaPO 4 F.
6. The compound of claim 1 , of formula Rb 2 CaPO 4 F.
7. A compound of formula A2B1-yRyPO4X, wherein
A is sodium, potassium, rubidium, or a combination thereof;
B is calcium, or a combination of calcium and at least one of strontium and barium;
X is fluorine, chlorine, or a combination thereof;
R is europium, samarium, ytterbium, or a combination thereof, and
y ranges from about 0.001 to about 0.1.
8. The compound of claim 7 , wherein A comprises sodium.
9. The compound of claim 7 , wherein B is calcium.
10. The compound of claim 7 , wherein X is fluorine.
11. The compound of claim 7 , wherein R is europium.
12. The compound of claim 7 , selected from the group consisting of Na 2 Ca 1-y Eu y PO 4 F, K 2 (Ca,Sr) 1-y Eu y PO 4 F, K 2 (Ca,Sr) 1-y Eu y PO 4 (F,Cl), (Na,K) 2 Ca 1-y Eu y PO 4 F, and (Na,K) 2 (Ca,Sr) 1-y Eu y PO 4 F.
13. The compound of claim 7 , wherein y ranges from about 0.005 to about 0.05.
14. The compound of claim 13 , wherein y ranges from about 0.01 to about 0.03.
15. A compound selected from the group consisting of K 2 CaPO 4 F, K 2 (Ca,Sr)PO 4 F, K 2 CaPO 4 (F,Cl), Rb 2 CaPO 4 F, Rb 2 (Ca,Sr)PO 4 F, Rb 2 CaPO 4 (F,Cl), Rb 2 Ca 0.99 Eu 0.01 PO 4 F, K 2 Ca 0.99 Eu 0.01 PO 4 F, K 2 Ca 0.99 Eu 0.01 PO 4 Cl, K 2 Ca 0.99 Eu 0.01 PO 4 (F,Cl), Na 2 Ca 0.99 Eu 0.01 PO 4 F, K 2 (Ca,Sr) 0.99 Eu 0.01 PO 4 F, Rb 2 (Ca,Sr) 0.99 Eu 0.01 PO 4 F, (Na,K) 2 Ca 0.99 Eu 0.01 PO 4 F, and (Na,K) 2 (Ca,Sr) 0.99 Eu 0.01 PO 4 F.
16. An LED lamp comprising a phosphor of formula A2B1-yRyPO4X, wherein
A is sodium, potassium, rubidium, or a combination thereof;
B is calcium, or a combination of calcium with at least one of strontium and barium;
X is fluorine, chlorine, or a combination thereof;
R is europium, samarium, ytterbium, or a combination thereof, and
y ranges from about 0.001 to about 0.1.
17. The LED lamp of claim 16 , wherein A comprises potassium.
18. The LED lamp of claim 16 , wherein B is calcium.
19. The LED lamp of claim 16 , wherein X is fluorine.
20. The LED lamp of claim 16 , wherein R is europium.