Light emitting device for generating specific colored light, including white light
First Claim
1. A light emitting device comprising at least one LED with primary emission (peak) from 370 to 480 nm covered directly or indirectly with a phosphor-containing covering, the phosphor-containing covering comprising at least one of the following phosphors:
- type I;
a metal sulfide photoluminescent material activated with europium containing at least one element M selected from the group consisting of Ba, Mg, and Zn;
type II;
a complex thiometalate photoluminescent material activated with at least one of europium and cerium, containing
1) at least one element M* selected from the group consisting of Mg, and Zn, and
2) at least one element N* selected from the group consisting of Al, Ga, In, Y, La, Gd and wherein the type I phosphor contains in addition at least one of Ca and Sr as part of element M.
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Accused Products
Abstract
A device for the generation of specific colored light including white light by luminescent down conversion and additive color mixing based on a light-emitting diode (LED) comprising a semiconductor light-emitting layer emitting near UV light about 370-420 nm or blue light about 420-480 nm and phosphors which absorb completely or partly the light emitted by the light-emitting component and emit light of wavelengths longer than that of the absorbed primary light, wherein the light emitting layer of the light emitting component is preferably a Ga(In)N-based semiconductor; and at least one of the phosphors contains a metal sulfide fluorescent material activated with europium containing at least one element selected from the group consisting of Ba, Sr, Ca, Mg and Zn; and/or at least another phosphor which contains a complex thiometalate fluorescent material activated with either europium, cerium or both europium and cerium containing 1) at least one element selected from the group consisting of Ba, Sr, Ca, Mg and Zn and 2) at least one element selected from the group consisting of Al, Ga, In, Y, La and Gd.
93 Citations
29 Claims
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1. A light emitting device comprising at least one LED with primary emission (peak) from 370 to 480 nm covered directly or indirectly with a phosphor-containing covering, the phosphor-containing covering comprising at least one of the following phosphors:
- type I;
a metal sulfide photoluminescent material activated with europium containing at least one element M selected from the group consisting of Ba, Mg, and Zn;type II;
a complex thiometalate photoluminescent material activated with at least one of europium and cerium, containing
1) at least one element M* selected from the group consisting of Mg, and Zn, and
2) at least one element N* selected from the group consisting of Al, Ga, In, Y, La, Gd andwherein the type I phosphor contains in addition at least one of Ca and Sr as part of element M. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- type I;
-
8. A light emitting device comprising a blue emitting LED covered with a phosphor containing covering, the phosphor-containing covering containing at least one of the following phosphors:
- type I;
a metal sulfide photoluminescent material activated with europium containing at least one element M selected from the group consisting of Ba, Mg, and Zn;type II;
a complex thiometalate photoluminescent material activated with at least one of europium and cerium, containing
1) at least one element M* selected from the group consisting of Mg, and Zn, and
2) at least one element N* selected from the group consisting of Al, Ga, In, Y, La and Gd; and
wherein at least one phosphor of type I and II are combined. - View Dependent Claims (9, 10, 11)
- type I;
-
12. A light emitting device comprising a UV emitting LED covered with a phosphor containing covering, the phosphor-containing covering containing at least one of the following phosphors:
- type I;
a metal sulfide photoluminescent material activated with europium containing at least one element M selected from the group consisting of Ba, Mg, and Zn;type II;
a complex thiometalate photoluminescent material activated with at least one of europium and cerium, containing
1) at least one element M* selected from the group consisting of Mg, and Zn, and
2) at least one element N* selected from the group consisting of Al, Ga, In, Y, La and Gd; and
wherein at least one phosphor of type I and II are combined. - View Dependent Claims (13, 14, 15)
- type I;
-
16. A phosphor which absorbs radiation having a first spectrum and emits radiation having a second spectrum, the phosphor comprising:
- a photoluminescent metal sulfide MS (Type I phosphor) of the formula (Sr1-x-yMxEuy)S with M is at least one of Ba, Mg, Zn alone or in combination with Ca and 0<
x≦
0.5 and 0<
y≦
0.10, or a photoluminescent phosphor comprising a complex metal thiometallate photoluminescent material M*N*2S4 (type II phosphor) comprising of at least one element selected from the group M*═
Mg, Zn, alone or in combination with at least one of Ba, Sr, Ca, and at least one element selected from the group N*═
Al, Ga, alone or in combination with In, Y, La, Gd, N* being activated with at least one of europium (Eu) and cerium (Ce). - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
- a photoluminescent metal sulfide MS (Type I phosphor) of the formula (Sr1-x-yMxEuy)S with M is at least one of Ba, Mg, Zn alone or in combination with Ca and 0<
Specification