LIGHT EMITTING DEVICE
First Claim
Patent Images
1. 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, c1 and d1 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, 0.55<
a2<
0.95, 2.0<
b2<
3.9, 0<
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<
0.3, −
3<
z≦
1, −
3<
u−
w≦
1.5).
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Accused Products
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.
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Citations
20 Claims
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1. 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, c1 and d1 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, 0.55<
a2<
0.95, 2.0<
b2<
3.9, 0<
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<
0.3, −
3<
z≦
1, −
3<
u−
w≦
1.5). - View Dependent Claims (2, 3, 4, 5, 6)
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7. 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, c1 and d1 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, 0.55<
a2<
0.95, 2.0<
b2<
3.9, 0<
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<
0.3, −
3<
z1, −
3<
u−
w≦
1.5). - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. 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, c1 and d1 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, 0.55<
a2<
0.95, 2.0<
b2<
3.9, 0<
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<
0.3, −
3<
z≦
1, −
3<
u−
w≦
1.5). - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification