Inorganic oxide and phosphor
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorShozo Oshio
Life of this patent
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Abstract
The present invention provides an inorganic oxide made of MLn2QR4O12, where M is at least one element selected from the group consisting of Mg, Ca, Sr, and Ba; Ln is at least one rare earth element selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu; Q is at least one element selected from the group consisting of Si, Ge, Sn, and Pb,; and R is at least one element selected from the group consisting of B, Al, Ga, In, and Tl. This inorganic oxide serves as a phosphor or a phosphor host and if it contains ions capable of being the luminescent center, it becomes a phosphor emitting fluorescent light. Thus, a novel oxide that can be a phosphor host of a high efficiency phosphor or the phosphor itself and a novel phosphor are provided.
Claims20
An inorganic oxide expressed by a chemical formula III
- (1−x)MLn2QR4O12.xLn3R5O12 (III)
- where M is at least one element selected from the group consisting of Mg, Ca, Sr, and Ba, wherein M is 50 atomic % or more of Ba;
- Ln is at least one rare earth element selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu;
- Q is at least one element selected from the group consisting of Si, Ge, Sn, and Pb;
- R is at least one element selected from the group consisting of B, Al, Ga, In, and Tl;
- and
- x is in a range of 0≦x≦0.7.
A phosphor having an inorganic oxide expressed by a chemical formula III as a phosphor host or an active component
- (1−x)MLn2QR4O12.xLn3R5O12 (III)
- where M is at least one element selected from the group consisting of Mg, Ca, Sr, and Ba, wherein M is 50 atomic % or more of Ba;
- Ln is at least one rare earth element selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu;
- Q is at least one element selected from the group consisting of Si, Ge, Sn, and Pb;
- R is at least one element selected from the group consisting of B, Al, Ga, In, and Tl;
- and
- x is in a range of 0≦x≦0.7.
An inorganic oxide expressed by a chemical formula III below which is a solid solution, in which an inorganic oxide expressed by a chemical formula II below is doped into an inorganic oxide expressed by the chemical formula I below
- MLn2QR4O12 (I)
- Ln3R5O12 (II)
- (1−x)MLn2QR4O12.xLn3R5O12 (III)
- where M is at least one element selected from the group consisting of Mg, Ca, Sr, and Ba;
- Ln is at least one rare earth element selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu;
- Q is at least one element selected from the group consisting of Si, Ge, Sn, and Pb;
- R is at least one element selected from the group consisting of B, Al and Ga;
- and
- x is in a range of 0<x≦0.98.
- wherein the majority of a combination of M is made up of Ba and the majority of Q is made of Si.
An inorganic oxide expressed by a chemical formula I below
- MLn2QR4O12 (I)
- wherein the inorganic oxide has a hexagonal crystal structure or a perovskite structure,
- M is at least one element selected from the group consisting of Mg, Ca, Sr, and Ba;
- Ln is at least one rare earth element selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu;
- Q is Si;
- and
- R is B or Al.
Dependencies are inferred from the claim text.