PHOSPHOR AND USE THEREOF
First Claim
Patent Images
1. A nitride or oxynitride phosphor containing a divalent alkaline earth metal element and a divalent to tetravalent rare-earth metal element, wherein, the nitride or oxynitride phosphor corresponding to the following i) and/or ii):
- i) the alkaline earth metal element is substituted by an element having a lower valence than the alkaline earth metal element and/or a vacancy; and
ii) the rare-earth metal element is substituted by an element having a lower valence than the rare-earth metal element and/or a vacancy.
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Abstract
A phosphor which emits light having high brightness, serves as an excellent orange or red phosphor whose light brightness is less decreased when exposed to an excitation source contains a crystal phase having the chemical composition expressed by the general formula [1]:
(1−a−b)(Ln′pMII′1−pMIII′MIV′N3)·a(MIV′(3n+2)/4NnO)·b(AMIV′2N3) [1]
- wherein Ln′ represents a metal element selected from the group consisting of lanthanoids, Mn, and Ti; MnII′ represents a divalent metal element except the Ln′ element; MIII′ represents a trivalent metal element; MIV′ represents a tetravalent metal element; A represents a metal element selected from the group consisting of Li, Na, and K; 0<p≦0.2; 0≦a, 0≦b, a+b>0, 0≦n, and 0.002≦(3n+2)a/4≦0.9.
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Citations
89 Claims
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1. A nitride or oxynitride phosphor containing a divalent alkaline earth metal element and a divalent to tetravalent rare-earth metal element, wherein, the nitride or oxynitride phosphor corresponding to the following i) and/or ii):
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i) the alkaline earth metal element is substituted by an element having a lower valence than the alkaline earth metal element and/or a vacancy; and ii) the rare-earth metal element is substituted by an element having a lower valence than the rare-earth metal element and/or a vacancy. - View Dependent Claims (2, 3, 39, 42, 45, 48, 51, 54, 57, 60, 63, 66, 69, 72, 75, 78, 81, 84, 87)
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4. A phosphor containing a crystal phase having the chemical composition expressed by the general formula [1]:
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(1−
a−
b)(Ln′
pMII′
1−
pMIII′
MIV′
N3)·
a(MIV′
(3n+2)/4NnO)·
b(AMIV′
2N3)
[1]wherein in the general formula [1], Ln′
is at least one metal element selected from the group consisting of lanthanoids, Mn, and Ti;
MnII′
represents one or more elements selected from the group consisting of divalent metal elements except the Ln′
element;
MIII′
represents one or more elements selected from the group consisting of trivalent metal elements;
MIV′
represents one or more elements selected from the group consisting of tetravalent metal elements;
A represents one or more monovalent metal elements selected from the group consisting of Li, Na, and K;
p satisfies 0<
p≦
0.2; and
a, b, and n satisfy 0≦
a, 0≦
b, a+b>
0, 0≦
n, and 0.002≦
(3n+2)a/4≦
0.9. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 40, 43, 46, 49, 52, 55, 58, 61, 64, 67, 70, 73, 76, 79, 82, 85, 88)
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- 38. A phosphor containing an alkaline earth metal element, silicon, and nitrogen, wherein an inorganic compound having the same crystal structure as that of the phosphor (except for a solid solution of the phosphor) is solid-dissolved.
Specification