Phosphor, method for producing phosphor, phosphor-containing composition, light-emitting device, lighting system and image display device
AssigneeMitsubishi Chemical Corporation
InventorsTakatoshi Seto, Naoto Kijima, Keiichi Seki, Ryuji Adachi, Hiroyasu Yamada, Tatsuya Inoue
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Abstract
To provide a yellow to orange phosphor which has high luminance and excellent temperature characteristics and which also has high luminance when mixed with a phosphor of a different color. A phosphor containing a crystal phase represented by the following formula [I], wherein when its object color is expressed by the L*a*b* color system, the values of a*, b* and (a*2+b*2)1/2 satisfy −20≦a*≦−2, 71≦b* and 71≦(a*2+b*2)1/2, respectively: R3−x−y−z+w2MzA1.5x+y−w2Si6−w1−w2Alw1+w2Oy+w1N11−y−w1 [I].
Claims22
A phosphor containing a crystal phase represented by the following formula [I], wherein when its object color is expressed by the L*a*b* color system, the values of a*, b* and (a*2+b*2)1/2 satisfy −20≦a*≦−2, 71≦b* and 71≦(a*2+b*2)1/2, respectively:
- R3−x−y−z+w2MzA1.5x+y−w2Si6−w1−w2Alw1+w2Oy+w1N11−y−w1 [I]
- wherein R is at least one rare earth element selected from the group consisting of La, Gd, Lu, Y and Sc;
- M is at least one metal element selected from the group consisting of Ce, Eu, Mn, Yb, Pr and Tb;
- A is at least one bivalent metal element selected from the group consisting of Ba, Sr, Ca, Mg and Zn;
- and x, y, z, w1 and w2 represent numerical values within the following ranges, respectively:
- (1/7)≦(3−x−y−z+w2)/6<(1/2),
- 0≦(1.5x+y−w2)/6<(9/2),
- 0≦x<3,
- 0≦y<2,
- 0<z<1,
- 0≦w1≦5,
- 0≦w2≦5,
- 0≦w1+w2≦5.
A method for producing a phosphor containing a crystal phase represented by the following formula [I], wherein when its object color is expressed by the L*a*b* color system, the values of a*, b* and (a*2+b*2)1/2 satisfy −20<a*<−2, 71<b* and 71<(a*2+b*2)1/2, respectively, which comprises nitriding an alloy for production of a phosphor, containing at least elements of R, A and Si, wherein said alloy is subjected to firing in the presence of a flux:
- R3−x−y−z+w2MzA1.5x+y−w2Si6−w1−w2Alw1+w2Oy+w1N11−y−w1 [I]
- wherein R is at least one rare earth element selected from the group consisting of La, Gd, Lu, Y and Sc;
- M is at least one metal element selected from the group consisting of Ce, Eu, Mn, Yb, Pr and Tb;
- A is at least one bivalent metal element selected from the group consisting of Ba, Sr, Ca, Mg and Zn;
- and x, y, z, w1 and w2 represent numerical values within the following ranges, respectively:
- (1/7)≦(3−x−y−z+w2)/6<(1/2),
- 0≦(1.5x+y−w2)/6<(9/2),
- 0≦x<3,
- 0≦y<2,
- 0<z<1,
- 0≦w1≦5,
- 0≦w2≦5,
- 0≦w1+w2≦5.
A phosphor containing a composition represented by the following formula [I′], wherein when its object color is expressed by the L*a*b* color system, the values of a*, b* and (a*2+b*2)1/2 satisfy −20≦a*≦−2, 71≦b* and 71≦(a*2+b*2)1/2, respectively:
- (Ln,Ca,Ce)3+αSi6N11 [I′]
- wherein Ln is at least one rare earth element selected from the group consisting of La, Gd, Lu, Y and Sc, and α is a numerical value within a range of −0.1≦α≦1.5.
Dependencies are inferred from the claim text.