Phosphor compositions and lighting apparatus thereof
View Patent ↗A lighting apparatus that includes a light source and a phosphor composition radiationally coupled to the light source is presented. The phosphor composition includes a first phosphor that includes a phase of general formula (I): L 3 ZO 4 (Br 2-n X n ):Eu 2+ wherein 0≦n≦1; L is Zn, Mg, Ca, Sr, Ba, or combinations thereof; Z is Si, Ge, or a combination thereof; and X is F, Cl, I, or combinations thereof.
1. A phosphor composition comprising: a first phosphor comprising at least two phases of general formulae:
L 3 ZO 4 (Br 2-n X n ):Eu 2+ ; (I)
L 9 Z 3 O 12 (Br 6-n X n ):Eu 2+ ; or (II)
L 5 Z 2 O 7 (Br 4-n X n ):Eu 2+ , (III)
wherein 0≦n≦1; L is Zn, Mg, Ca, Sr, Ba, or combinations thereof; Z is Si, Ge, or a combination thereof; and X is F, Cl, I, or combinations thereof.
2. The phosphor composition of claim 1 , wherein L is Sr, and Z is Si.
3. The phosphor composition of claim 1 , wherein the phase of general formula (I) is Sr 3 SiO 4 Br 2 :Eu 2+ .
4. The phosphor composition of claim 1 , wherein the phase of general formula (II) is Sr 9 Si 3 O 12 Br 6 :Eu 2+ .
5. The phosphor composition of claim 1 , wherein the phase of general formula (III) is Sr 5 Si 2 O 7 Br 4 :Eu 2+ .
6. The phosphor composition of claim 1 , wherein a portion of Eu 2+ in at least one phase of the first phosphor is substituted by Mn 2+ , Mn 4+ ,Ce 3+ , Sn 2+ , Bi 3+ , Sb 3+ , Cr 3+ , Pb 2+ , or combinations thereof.
7. A phosphor composition comprising:
a first phosphor comprising a red-emitting phase of general formula (I)
L 3 ZO 4 (Br 2-n X n ):Eu 2+ (I); and
a red-emitting second phosphor of general formula (IV)
A 2 [MF 6 ]:Mn 4+ (IV),
wherein 0≦n≦1, L is Zn, Mg, Ca, Sr, Ba, or combinations thereof; Z is Si, Ge, or a combination thereof; and X is F, Cl, I, or combinations thereof, A is Li, Na, K, Rb, Cs, or combinations thereof, and M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Hf, Y, La, Nb, Ta, Bi, Gd, or combinations thereof.
8. The phosphor composition of claim 7 , wherein a ratio of a spectral weight of the phase of general formula (I) to a spectral weight of the second phosphor is in a range from about 1:5 to 5:1.
9. The phosphor composition of claim 7 , wherein the red-emitting second phosphor of general formula (IV) is K 2 SiF 6 :Mn 4+ .
10. The phosphor composition of claim 7 , further comprising a third phosphor selected from the group consisting of an oxyhalide, garnet, orthosilicate, beta-sialon and combinations thereof.
11. The phosphor composition of claim 10 , wherein the third phosphor is Ca 8-x Eu x Mg(SiO 4 ) 4 Cl 2 , where 0<x≦0.5.
12. A lighting apparatus comprising a light source and the phosphor composition according to claim 1 radiationally coupled to the light source.
13. The lighting apparatus of claim 12 , wherein the light source comprises a light emitting diode (LED) device.
14. A back light apparatus comprising a light source and the phosphor composition according to claim 1 radiationally coupled to the light source.
15. A liquid crystal display apparatus, comprising a liquid crystal panel and the back-light apparatus according to claim 14 disposed on a back surface of the liquid crystal panel.
16. The phosphor composition of claim 7 , wherein:
the red-emitting phase of general formula (I) is L 3 ZO 4 Br 2 :Eu 2+ , wherein L is Zn, Mg, Ca, Sr, Ba, or combinations thereof; and Z is Si, Ge, or a combination thereof; and
the red-emitting second phosphor of formula (IV) is K 2 SiF 6 :Mn 4+ , and
wherein a ratio of a spectral weight of the phase of general formula L 3 ZO 4 Br 2 :Eu 2+ to a spectral weight of K 2 SiF 6 :Mn 4+ is in a range from about 1:5 to about 5:1.
17. The phosphor composition of claim 7 , wherein the red-emitting phase of formula (I) is Sr 3 SiO 4 Br 2 :Eu 2+ .
18. The phosphor composition of claim 7 , wherein the first phosphor further comprises an additional phase of general formula (II), general formula (III), or a combination thereof,
L 9 Z 3 O 12 (Br 6-n X n ):Eu 2+ (II)
L 5 Z 2 O 7 (Br 4-n X n ):Eu 2+ (III)
wherein 0≦n≦1; L is Zn, Mg, Ca, Sr, Ba, or combinations thereof; Z is Si, Ge, or a combination thereof; and X is F, Cl, I, or combinations thereof.
19. A phosphor composition comprising a first phosphor comprising a red-emitting phase of general formula (I)
L 3 ZO 4 (Br 2-n X n ):Eu 2+ (I)
wherein 0≦n≦1; L is Zn, Mg, Ca, Sr, Ba, or combinations thereof; Z is Si, Ge, or a combination thereof; and X is F, Cl, I, or combinations thereof.
20. The phosphor composition of claim 19 , wherein the red-emitting phase of general formula (I) is Sr 3 ZO 4 (Br 2-n X n ):Eu 2+ , wherein 0≦n≦1; Z is Si, Ge, or a combination thereof; and X is F, Cl, I, or combinations thereof.