Phosphor and use thereof
AssigneesMitsubishi Chemical Corporation, Independent Administrative Institution National Institute for Materials Science
InventorsNaoto Hirosaki, Takatoshi Seto, Naoto Kijima
Life of this patent
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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.
Claims42
A phosphor containing 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 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, and
- which is a mixture of a crystal phase having the chemical composition expressed by the general formula [1], a crystal phase having a crystal structure different from that of said crystal phase (hereinafter referred to as “other crystal phase”), and/or an amorphous phase, wherein the proportion of the crystal phase having the chemical composition expressed by the general formula [1] in the mixture is 20% by mass or more.
A phosphor containing a crystal phase having the chemical composition expressed by the general formula [10]:
- (EuyLn″wMII1−y−wMIIIMIVN3)1−x(MIV(3n+2)/4NnO)x [10]
- wherein in the general formula [10], Ln″ is at least one metal element selected from the group consisting of lanthanoids except Eu, Mn, and Ti;
- MII represents divalent metal elements including Mg, Ca, Sr, Ba, and Zn at a ratio of 90 mol % or more in total;
- MIII represents trivalent metal elements including Al at a ratio of 80 mol % or more;
- MIV represents tetravalent metal elements including Si at a ratio of 90 mol % or more;
- y satisfies 0<y≦0.2;
- w satisfies 0≦w<0.2;
- x satisfies 0<x≦0.45;
- n satisfies 0≦n;
- and n and x satisfy 0.002≦(3n+2)x/4≦0.9.
A phosphor containing a crystal phase having a chemical composition expressed by the general formula [21]:
- (CeyLnzMII1−y−zMIIIMIVN3)1−x(MIV(3n+2)/4NnO)x [21]
- wherein in the general formula [21], Ln is at least one metal element selected from the group consisting of lanthanoids except Ce, Mn, and Ti;
- MII represents divalent metal elements including Mg, Ca, Sr, Ba, and Zn at a ratio of 90 mol % or more in total;
- MIII represents trivalent metal elements including Al at a ratio of 80 mol % or more;
- MIV represents tetravalent metal elements including Si at a ratio of 90 mol % or more;
- x satisfies 0<x≦0.45;
- y satisfies 0<y≦0.2;
- z satisfies 0≦z≦0.2;
- n satisfies 0≦n;
- and n and x satisfy 0.002≦(3n+2)x/4≦0.9.
A phosphor containing a crystal phase having a chemical composition expressed by the general formula [31]:
- (EuyMII1−yMIIIMIVN3)1−(AMIV2N3)x′ [31]
- wherein in the general formula [31], MII represents divalent metal elements including Mg, Ca, Sr, Ba, and Zn at a ratio of 90 mol % or more in total;
- MIII represents trivalent metal elements including Al at a ratio of 80 mol % or more;
- MIV represents tetravalent metal elements including Si at a ratio of 90 mol % or more;
- A represents one or more metal elements selected from the group consisting of Li, Na, and K;
- x′ satisfies 0<x′<0.5;
- and y satisfies 0<y≦0.2.
Dependencies are inferred from the claim text.