Phosphor and phosphor film for electron beam excitation and color display apparatus using the same

• US 20070029525A1
• Filed: 08/02/2005
• Published: 02/08/2007
• Est. Priority Date: 08/02/2004
• Status: Active Grant

• Current Assignee: Nichia Corporation
• Original Assignee: Dowa Mining Company Limited
• Inventors: Gotoh, Masahiro, Nagatomi, Akira, Yamashita, Shuji, Sakane, Kenji
• Granted Patent: US 7,527,748 B2
• Time in Patent Office: Days
• US Class Current: 252/301.40F
• CPC Class Codes: C04B 2235/3224 Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
• CPC Class Codes: C04B 2235/3852 Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride
• CPC Class Codes: C04B 2235/3865 Aluminium nitrides
• CPC Class Codes: C04B 2235/3873 Silicon nitrides, e.g. silicon carbonitride, silicon oxynitride
• CPC Class Codes: C04B 2235/5436 micrometer sized, i.e. from 1 to 100 micron
• CPC Class Codes: C04B 35/581 based on aluminium nitride
• CPC Class Codes: C04B 35/584 based on silicon nitride
• CPC Class Codes: C04B 35/6262 of calcined, sintered clinker or ceramics
• CPC Class Codes: C09K 11/0883 Arsenides; Nitrides; Phosphides
• CPC Class Codes: C09K 11/77348 Silicon Aluminium Nitrides or Silicon Aluminium Oxynitrides
• CPC Class Codes: H01J 2329/00 Electron emission display panels, e.g. field emission display panels
• CPC Class Codes: H01J 29/20 characterised by the luminescent material

Abstract

To provide a phosphor for an electron beam excitation with a small deterioration in an emission efficiency and capable of maintaining a high luminance, even when an excitation density of an electron beam for a phosphor excitation is increased. As raw materials, Ca₃N₂(2N), AlN(3N), Si₃N₄(3N), and Eu₂O₃(3N) are prepared, and the raw materials thus prepared are measured and mixed, so that a molar ratio of each element becomes (Ca+Eu):Al:Si=1:1:1. Then, the mixture thus obtained is maintained and fired for at 1500° C. for 3 hours, and thereafter crushed, to manufacture the phosphor having a composition formula Ca_0.985SiAlN₃:Eu_0.015.

Claims

1. A phosphor for an electron beam excitation, expressed by a composition formula MmAaBbOoNn:

Z (wherein element M is more than one kind of element having bivalent valency, element A is more than one kind of element having tervalent valency, element B is more than one kind of element having tetravalent valency, 0 is oxygen, N is nitrogen, element Z is the element acting as an activator in the phosphor, satisfying m>

0, a>

0, b>

0, o≧

0, n=2/3m+a+4/3b−

2/30.)

2. The phosphor for the electron beam excitation according to claim 1, wherein values of the m, a, b are m=a=b=1.

3. The phosphor for the electron beam excitation according to claim 1, wherein the element M is more than one kind of element selected from the group consisting of Mg, Ca, Sr, Ba, and Zn, the element A is more than one kind of element selected from the group consisting of B (boron), Al and Ga, the element B is Si and/or Ge, and the element Z is more than one kind of element selected from rare earth elements or transitional metal elements.

4. The phosphor for the electron beam excitation according to claim 1, wherein the element A is Al, and the element B is Si.

5. The phosphor for the electron beam excitation according to claim 1, wherein the element M is Ca, and the element Z is Eu.

6. The phosphor for the electron beam excitation according to claim 1, which is expressed by a general formula CaAlSiN₃:

Eu.

7. The phosphor for the electron beam excitation according to claim 1, wherein the phosphor for the electron beam excitation is in a powdery state.

8. The phosphor for the electron beam excitation according to claim 7, wherein a mean particle size of the phosphor for the electron beam excitation is not more than 10 μ

m and not less than 1 μ

m.

9. A color display apparatus, using the phosphor for the electron beam excitation according to claim 1.

10. A phosphor film for an electron beam excitation, manufactured by using the phosphor for the electron beam excitation according to claim 1, wherein a film thickness is 65 μ

m or less.

11. A phosphor film for an electron beam excitation, manufactured by using the phosphor for the electron beam excitation according to claim 1, wherein a phosphor coating amount is 7.0 mg/cm² or less per unit area.

12. A color display apparatus, using the phosphor film for the electron beam excitation according to claim 10.