Fluorophor and method for production thereof and illuminator

Patent metadata

Field	Value
Publication number	US-9677000-B2
Application number	US-201414507202-A
Country	US
Kind code	B2
Filing date	Oct 6, 2014
Priority date	Jul 1, 2005
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

A fluorophor includes: α-type sialon crystal which is expressed by a general formula: (Li x1 , Eu x2 )(Si 12−(m+n) Al m+n )(O n N 16−n ), wherein x1 is an amount of solid solution of Li in a sialon unit cell, and x2 is an amount of solid solution of Eu in the sialon unit cell, wherein the parameters x1, x2, m, and n satisfy: 1.6≦x1≦2.4 (1), 0.001≦x2≦0.4 (2), 1.8≦m≦2.4 (3), 0.8≦n≦1.2 (4), wherein the α-type sialon crystal emits fluorescence with a peak in a wavelength region of from 550 nm to 575 nm upon irradiation of an excitation source.

First claim

What is claimed is:

1. A phosphor comprising: α-type sialon crystal which is expressed by a general formula:
(Li x1 ,Eu x2 )(Si 12−(m+n) Al m+n )(O n N 16−n ),
wherein x1 is an amount of solid solution of Li in a sialon unit cell, and x2 is an amount of solid solution of Eu in the sialon unit cell,
wherein the parameters x1, x2, m, and n satisfy:
1.6≦ x 1≦2.4  (1),

0.001≦ x 2≦0.4  (2),

1.8≦ m≦ 2.4  (3),

0.8≦ n≦ 1.2  (4),

wherein the α-type sialon crystal emits fluorescence with a peak in a wavelength region of from 550 nm to 575 nm upon irradiation of an excitation source.

2. The phosphor according to claim 1
wherein the excitation source is an ultraviolet or visible light having wavelength that is at least 100 nm and does not exceed 500 nm.

3. The phosphor according to claim 1
wherein the fluorescence emitted upon irradiation of the excitation source has an emission color represented by (x, y) values in the CIE Chromaticity coordinate and satisfying the conditions:
0.2≦ x≦ 0.5  (17), and

0.45≦ y≦ 0.7  (18).

4. The phosphor according to claim 1 further comprising:
an amorphous phase or another crystalline phase than the α-type sialon,
wherein a content amount of the α-type sialon crystal is 10 mass % or more.

5. The phosphor according to claim 4
wherein the content amount of the α-type sialon crystal is 50 mass % or more.

6. The phosphor according to claim 4
wherein the amorphous phase or the other crystalline phase is an inorganic substance having electronic conductivity.

Assignees

• Nat Inst For Materials Science

Inventors

• Hirosaki Naoto
• Xie Rong-Jun
• Mitomo Mamoru

Classifications

• H10W90/756

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• H10W74/00

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• H10W72/01515

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• H10W72/884

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