HALOPHOSPHATE PHOSPHOR AND WHITE LIGHT-EMITTING DEVICE
First Claim
1. A white light-emitting device being a phosphor conversion-type comprising a semiconductor light-emitting element that emits light in a near-ultraviolet wavelength region, and a phosphor which converts wavelength of light emitted by the semiconductor light-emitting element to generate white light,wherein the phosphor includes a blue phosphor having a chemical composition of general formula [1] below, a green phosphor having an emission peak wavelength of 535 nm or greater, and at least one type of red phosphor selected from among an Eu-activated nitride phosphor and an Eu-activated oxynitride phosphor:
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(Sr,Ca)aBabEux(PO4)cXd
[1](In general formula [1], X is Cl;
c, d and x are numbers satisfying 2.7≦
c≦
3.3, 0.9≦
d≦
1.1 and 0.3≦
x≦
1.2; and
a and b satisfy the conditions a+b=5−
x and 0.05≦
b/(a+b)≦
0.6).
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Accused Products
Abstract
The present invention provides a blue (blue-green) phosphor that has sufficient emission intensity in the wavelength region around 490 nm and that has high emission luminance at a temperature region reached during LED operation. The present invention also provides a white light-emitting device that uses a high-luminance green phosphor having an emission peak wavelength of 535 nm or greater and that has improved bright blue reproducibility.
A phosphor having a chemical composition of general formula [1] has sufficient emission intensity in a wavelength region around 490 nm, and a white light-emitting device that uses such a phosphor has improved bright blue reproducibility.
(Sr,Ca)aBabEux(PO4)cXd [1]
(In general formula [1], X is Cl; c, d and x are numbers satisfying 2.7≦c≦3.3, 0.9≦d≦1.1 and 0.3≦x≦1.2; and a and b satisfy the conditions a+b=5−x and 0.05≦b/(a+b)≦0.6.)
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Citations
14 Claims
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1. A white light-emitting device being a phosphor conversion-type comprising a semiconductor light-emitting element that emits light in a near-ultraviolet wavelength region, and a phosphor which converts wavelength of light emitted by the semiconductor light-emitting element to generate white light,
wherein the phosphor includes a blue phosphor having a chemical composition of general formula [1] below, a green phosphor having an emission peak wavelength of 535 nm or greater, and at least one type of red phosphor selected from among an Eu-activated nitride phosphor and an Eu-activated oxynitride phosphor: -
(Sr,Ca)aBabEux(PO4)cXd
[1](In general formula [1], X is Cl;
c, d and x are numbers satisfying 2.7≦
c≦
3.3, 0.9≦
d≦
1.1 and 0.3≦
x≦
1.2; and
a and b satisfy the conditions a+b=5−
x and 0.05≦
b/(a+b)≦
0.6). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A phosphor, used in a light-emitting device that has a first luminous body that emits light of 350 to 430 nm and a second luminous body that emits visible light as a result of being irradiated with light from the first luminous body, the phosphor being used by being incorporated into the second luminous body,
wherein the phosphor has a chemical composition represented by general formula [1′ - ] below, and
an I(490 nm)/I(peak) value, in which I(peak) denotes an intensity of an emission peak wavelength and I(490 nm) denotes an intensity at wavelength 490 nm in an emission spectrum of the phosphor upon excitation with light of wavelength 410 nm, satisfies formula [2] below;
SraBabEux(PO4)c)Cd
[1′
](In general formula [1′
], X is Cl;
c, d and x are numbers satisfying 2.7≦
c≦
3.3, 0.9≦
d≦
1.1 and 0.3≦
x≦
1.2; and
a and b satisfy the conditions a+b=5−
x and 0.1≦
b/(a+b)≦
0.6),
0.2≦
I(490 nm)/I(peak)
[2]. - View Dependent Claims (10, 11, 12, 13, 14)
- ] below, and
Specification