Phosphor and method for producing same

• US 5,858,278 A
• Filed: 02/20/1997
• Issued: 01/12/1999
• Est. Priority Date: 02/29/1996
• Status: Expired due to Fees

• Current Assignee: Futaba Denshi Kogyo KK
• Original Assignee: Futaba Denshi Kogyo KK
• Inventors: Kanie, Hisashi, Itoh, Shigeo, Kataoka, Fumiaki, Toki, Hitoshi
• Primary Examiner(s): KOSLOW, CAROL M
• Application Number:
  US08/803,508
• Time in Patent Office: 691 Days
• Field of Search: 252/301.4 R, 252/301.6 R, 257/102, 257/103, 257/13, 117/952
• US Class Current: 252/301.40R
• CPC Class Codes: C09K 11/62 containing gallium, indium or thallium

Abstract

A phosphor capable of being kept from being affected by oxygen during production thereof, carrying out luminescence due to excitation by electrons, selectively realizing various luminous colors depending on selection of starting materials and exhibiting satisfactory luminance and life characteristics. The phosphor is represented by a chemical formula Ga_1-x In_x N:A (0≦x<0.8, A═Zn or Mg) and prepared by mixing starting materials containing at least an oxygen-free gallium compound and an oxygen-free doping substance to prepare a mixture and heating the mixture in a nitrogen-containing atmosphere.

Claims

1. A method for producing a phosphor represented by a formula as follows:

Ga_1-x In_x N;

A, wherein 0≦

x<

0.8, and A═

Zn or Mg, comprising

mixing starting materials containing at least gallium sulfide, indium sulfide, and a chloride or sulfide oxygen-free doping substance, to provide a mixture; and

heating said mixture in a nitrogen-containing atmosphere to provide said phosphor.

2. A method for producing a phosphor represented by a formula as follows:

Ga_1-x In_x N;

A, wherein 0≦

x<

0.8, and A═

Zn or Mg, comprising

mixing starting materials containing at least gallium sulfide, indium sulfide, and a chloride or sulfide oxygen-free doping substance, to provide a mixture; and

subjecting said mixture to heating to melting followed by cooling by recondensation in a nitrogen-containing atmosphere to provide said phosphor.

3. A method as defined in claim 2, wherein said heating and said cooling are carried out at a rate of 1×

10⁷ to 1×

10⁴ °

C./s.

4. A method as defined in claim 2, wherein said heating and said cooling includes passing said mixture through plasma in the presence of a reactive gas-containing nitrogen.