Luminescent material
View Patent ↗A luminescent material is provided, which includes a compound having a composition represented by the following general formula (A): (Sr a1 ,Ba b1 ,Ca c1 ,Re v1 ,Eu w1 ) 2 SiO 4 (A) wherein, Re is at least one selected from a group consisting of Pr and Dy, and a1, b1, c1, v1 and w1 satisfy following relationships: a 1+ b 1+ c 1+ v 1+ w 1=1 (1), 0≦ a 1/(1− v 1− w 1)≦1 (2), 0≦ b 1/(1− v 1− w 1)≦1 (3), 0≦ c 1/(1− v 1− w 1)≦1 (4), 0< v 1≦0.15 (5), 0< w 1≦0.02 (6).
1. A luminescent material comprising:
a compound having a composition represented by a following general formula (A):
(Sr a1 ,Ba b1 ,Ca c1 ,Re v1 ,Eu w1 ) 2 SiO 4 (A)
wherein, Re is at least one selected from a group consisting of Pr and Dy; and a1, b1, c1, v1, and w1 satisfy following relationships:
a 1+ b 1+ c 1+ v 1+ w 1=1 (1);
0≦ a 1/(1− v 1− w 1)≦1 (2);
0≦ b 1/(1− v 1− w 1)≦1 (3);
0≦ c 1/(1− v 1− w 1)≦1 (4);
0< v 1≦0.15 (5);
0< w 1≦0.02 (6); and
v 1/ w 1>1 (7),
wherein the luminescent material is excited by light having a main luminescence peak falling within a wavelength ranging from 310 nm to 420 nm and the luminescent material exhibits a narrowband light emitting spectrum and a broadband light emitting spectrum and a peak wavelength of the luminescent material is in the range of 500-580 nm.
2. The luminescent material according to claim 1 , wherein the broadband light emitting spectrum appears in a wavelength region ranging from 500 nm to 600 nm.
3. The luminescent material according to claim 1 , wherein Re is Dy.
4. The luminescent material according to claim 3 , wherein the narrowband light emitting spectrum appears in a wavelength region ranging from 565 nm to 580 nm.
5. The luminescent material according to claim 1 , wherein Re is Pr.
6. The luminescent material according to claim 5 , wherein the narrowband light emitting spectrum appears in a wavelength region ranging from 500 nm to 520 nm.
7. The luminescent material according to claim 1 , wherein Re comprises Dy and Pr.
8. The luminescent material according to claim 7 , wherein the narrowband light emitting spectrum appears in a wavelength region ranging from 500 nm to 520 nm.
9. The luminescent material according to claim 1 , wherein b1, c1, v1, and w1 satisfy following relationships:
0 ≦b 1/(1− v 1− w 1)<0.3 (3a);
0 ≦c 1/(1 −v 1 −w 1)≦0.9 (4a);
0< v 1≦0.1 (5a); and
0 <w 1≦0.01 (6a).
10. The luminescent material according to claim 1 , wherein the relationship between v1 and w1 satisfy following relationship:
1 <v 1 /w 1≦50.
11. A luminescent material comprising:
a compound having a composition represented by the following general formula (B):
(Sr a2 ,Ba b2 ,Ca c2 ,Re v2 ,Eu w2 ,M v2 ) 2 SiO 4 (B)
wherein, Re is at least one selected from a group consisting of Pr and Dy; M is at least one selected from a group consisting of Li, Na, K, Rb and Cs; and a2, b2, c2, v2, and w2 satisfy following relationships:
a 2+ b 2+ c 2+2 v 2+ w 2=1 (7);
0 ≦a 2/(1−2 v 2 −w 2)≦1 (8);
0 ≦b 2/(1−2 v 2 −w 2)≦1 (9);
0 ≦c 2/(1−2 v 2 −w 2)≦1 (10);
0 <v 2≦0.15 (11);
0 <w 2≦0.02 (12); and
v 2 /w 2>1 (13),
wherein the luminescent material is excited by light having a main luminescence peak falling within a wavelength ranging from 310 nm to 420 nm and the luminescent material exhibits a narrowband light emitting spectrum and a broadband light emitting spectrum and a peak wavelength of the luminescent material is in the range of 500-580 nm.
12. The luminescent material according to claim 11 , wherein Re is Dy.
13. The luminescent material according to claim 12 , wherein the narrowband light emitting spectrum appears in a wavelength region ranging from 565 nm to 580 nm.
14. The luminescent material according to claim 11 , wherein Re is Pr.
15. The luminescent material according to claim 14 , wherein the narrowband light emitting spectrum appears in a wavelength region ranging from 500 nm to 520 nm.
16. The luminescent material according to claim 11 , wherein b2, c2, v2, and w2 satisfy following relationships:
0 ≦b 2/(1 −v 2 −w 2)<0.3 (8a);
0 ≦c 2/(1−2 v 2 −w 2)≦0.9 (9a);
0 <v 2≦0.1 (10a); and
0 <w 2≦0.01 (11a).
17. The luminescent material according to claim 11 , wherein the relationship between v2 and w2 satisfy following relationship:
1 <v 2 /w 2≦50.
18. A light-emitting device comprising:
a light-emitting element emitting light, the light having a main light emission peak in a wavelength ranging from 310 to 420 nm; and
a luminescent layer comprising a luminescent material configured to be irradiated with the light, at least part of the luminescent material being the luminescent material of claim 1 .
19. The light-emitting device according to claim 18 , wherein the luminescent layer comprises another luminescent material having a main light emission peak in a wavelength ranging from 580 to 680 nm.
20. A light-emitting device comprising:
a light-emitting element emitting light, the light having a main light emission peak in a wavelength ranging from 310 to 420 nm; and
a luminescent layer comprising a luminescent material configured to be irradiated with the light, at least part of the luminescent material being the luminescent material of claim 11 .
21. The light-emitting device according to claim 20 , wherein the luminescent layer comprises another luminescent material having a main light emission peak in a wavelength ranging from 580 to 680 nm.
22. The luminescent material according to claim 1 , wherein the luminescent material exhibits a narrowband light emitting spectrum and a broadband light emitting spectrum, and
wherein the broadband light-emitting spectrum is an emission band resulting from the luminescence due to a transition of Eu as a first activator and the narrowband light-emitting spectrum is an emission band resulting from the luminescence due to the transition of the second activator.
23. The luminescent material according to claim 11 , and the luminescent material exhibits a narrowband light emitting spectrum and a broadband light emitting spectrum, and
wherein the broadband light-emitting spectrum is an emission band resulting from the luminescence due to a transition of Eu as a first activator and the narrowband light-emitting spectrum is an emission band resulting from the luminescence due to the transition of the second activator.
24. The luminescent material according to claim 1 , wherein the luminescent material is excited by light having a main luminescence peak falling within a wavelength ranging from 310 nm to 392 nm.
25. The luminescent material according to claim 11 , wherein the luminescent material is excited by light having a main luminescence peak falling within a wavelength ranging from 310 nm to 392 nm.