Back to results
US 2012/0056526 A1Published application
Light emitting device
AssigneeKabushiki Kaisha Toshiba
InventorsIwao MITSUISHI, Shinya Nunoue, Takahiro Sato, Yumi Fukuda, Aoi Okada, Naotoshi Matsuda, Toshiki Hikosaka
Life of this patent
Estimating the term…
Abstract
A light emitting device according to one embodiment includes a light emitting element that emits light having a wavelength of 380 nm to 470 nm; a CASN first red phosphor that is disposed on the light emitting element; a sialon second red phosphor that is disposed on the light emitting element; and a sialon green phosphor that is disposed on the light emitting element.
Claims20
A light emitting device comprising:
- a light emitting element emitting light having a wavelength of 380 nm to 470 nm;
- a first red phosphor disposed on the light emitting element, the first red phosphor having a composition expressed by equation (1);
- a second red phosphor disposed on the light emitting element, the second red phosphor having a composition expressed by equation (2);
- and
- a green phosphor disposed on the light emitting element, the green phosphor having a composition expressed by equation (3),
- (Ca1−x1Eux1)a1AlSib1Oc1Nd1:Eu (1)
- (In the equation (1), x1, a1, b1, and c1 satisfy the following relationship:
- 0<x1<0.03, 0.90<a1<1.1, 0.90<b1<1.1, 0.20<c1<0.45, 2.40<d1≦3.00)
- (Sr1−x2Eux2)a2Sib2AlOc2Nd2 (2)
- (In the equation (2), x2, a2, b2, c2, and d2 satisfy the following relationship:
- 0<x2≦1, 0.60<a2<0.95, 2.0<b2<3.9, 0.04≦c2≦0.6, 4<d2<5.7)
- (Sr1−xEux)3−ySi13−zAl3+zO2+uN21−w (3)
- (In the equation (3), x, y, z, u, and w satisfy the following relationship:
- 0<x≦1, −0.1≦y≦0.15, −1≦z≦1, −1<u−w≦1.5).
11 more elements
A device comprising:
- a board;
- a light emitting element mounted on the board;
- a red fluorescent layer formed on the light emitting element, the red fluorescent layer including a first red phosphor having a composition expressed by equation (1) and a second red phosphor having a composition expressed by equation (2), the first red phosphor and the second red phosphor being dispersed in a resin;
- and
- a green fluorescent layer formed on the red fluorescent layer, the green fluorescent layer including a green phosphor dispersed in a resin, the green phosphor having a composition expressed by equation (3),
- (Ca1−x1Eux1)a1AlSib1Oc1Nd1:Eu (1)
- (In the equation (1), x1, a1, b1, and c1 satisfy the following relationship:
- 0<x1<0.03, 0.90<a1<1.1, 0.90<b1<1.1, 0.20<c1<0.45, 2.40<d1≦3.00)
- (Sr1−x2Eux2)a2Sib2AlOc2Nd2 (2)
- (In the equation (2), x2, a2, b2, c2, and d2 satisfy the following relationship:
- 0<x2≦1, 0.60<a2<0.95, 2.0<b2<3.9, 0.04≦c2≦0.6, 4<d2<5.7)
- (Sr1−xEux)3−ySi13−zAl3+zO2+uN21−w (3)
- (In the equation (3), x, y, z, u, and w satisfy the following relationship:
- 0<x≦1, −0.1≦y≦0.15, −1<u−w≦1.5).
11 more elements
A light emitting device comprising:
- a board;
- a light emitting element mounted on the board;
- a first red fluorescent layer formed on the light emitting element, the first red fluorescent layer including a first red phosphor dispersed in a resin, the first red phosphor having a composition expressed by equation (1);
- a second red fluorescent layer formed on the first red fluorescent layer, the second red fluorescent layer including
- a second red phosphor dispersed in a resin, the second red phosphor having a composition expressed by equation (2);
- and
- a green fluorescent layer formed on the second red fluorescent layer, the green fluorescent layer including a green phosphor dispersed in a resin, the green phosphor having a composition expressed by equation (3),
- (Ca1−x1Eux1)a1AlSib1Oc1Nd1:Eu (1)
- (In the equation (1), x1, a1, b1, and c1 satisfy the following relationship:
- 0<x1<0.03, 0.90<a1<1.1, 0.90<b1<1.1, 0.20<c1<0.45, 2.40<d1≦3.00)
- (Sr1−x2Eux2)a2Sib2AlOc2Nd2 (2)
- (In the equation (2), x2, a2, b2, c2, and d2 satisfy the following relationship:
- 0<x2≦1, 0.60<a2<0.95, 2.0<b2<3.9, 0.04≦c2≦0.6, 4<d2<5.7)
- (Sr1−xEux)3−ySi13−zAl3+zO2+uN21−w (3)
- (In the equation (3), x, y, z, u, and w satisfy the following relationship:
- 0<x≦1, −0.1≦y≦0.15, −1≦z≦1, −1<u−w≦1.5).
13 more elements
Dependencies are inferred from the claim text.