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

• US 7,527,748 B2
• Filed: 08/02/2005
• Issued: 05/05/2009
• Est. Priority Date: 08/02/2004
• Status: Expired

• Current Assignee: Nichia Corporation
• Original Assignee: Dowa Electronics Materials Co. Ltd. (DOWA Holdings Company Limited), Nichia Corporation
• Inventors: Gotoh, Masahiro, Nagatomi, Akira, Yamashita, Shuji, Sakane, Kenji
• Primary Examiner(s): KOSLOW, CAROL M
• Application Number:
  US11/194,590
• Publication Number:
  US 20070029525A1
• Time in Patent Office: 1,372 Days
• Field of Search: 252/301.4 F, 252/301.6 F, 313/486, 313/487, 313/461, 313/468, 313/467
• 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 film for an electron beam excitation, manufactured by using the phosphor for an electron beam excitation, expressed by a composition formula MmAaBbOoNn:

Z (wherein element M is at least one or more kind of element having bivalent valency, element A is at least one or more kind of element having tervalent valency, element B is at least one or more kind of element having tetravalent valency, O is oxygen, N is nitrogen, element Z is the element acting as an activator in the phosphor, satisfying o≧

0, n=2/3m+a+4/3b−

2/3o, m=a=b=1), wherein a film thickness is 65 μ

m or less.

7. A color display apparatus, using the phosphor film according to claim 1.

2. A phosphor film for an electron beam excitation, manufactured by using the phosphor for an electron beam excitation, expressed by a composition formula MmAaBbOoNn:

Z (wherein the element M is at least one or more kind of element selected from the group consisting of Mg, Ca, Sr, Ba, and Zn, the element A is at least one or more 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 at least one or more kind of element selected from rare earth elements or transitional metal elements, satisfying o≧

0, n=2/3m+a+4/3b−

2/3o, m=a=b=1), wherein a film thickness is 65 μ

m or less.

3. A phosphor film for an electron beam excitation, manufactured by using the phosphor for an electron beam excitation, expressed by a general formula CaAlSiN₃:

Eu, wherein a film thickness is 65 μ

m or less.

4. A phosphor film for an electron beam excitation, manufactured by using the phosphor for an electron beam excitation, expressed by a composition formula MmAaBbOoNn:

Z (wherein element M is at least one or more kind of element having bivalent valency, element A is at least one or more kind of element having tervalent valency, element B is at least one or more kind of element having tetravalent valency, O is oxygen, N is nitrogen, element Z is the element acting as an activator in the phosphor, satisfying o≧

0, n=2/3m+a+4/3b−

2/3o, m=a=b=1), wherein a phosphor coating amount is 7.0 mg/cm² or less per unit area.

8. A color display apparatus, using the phosphor film according to claim 4.

5. A phosphor film for an electron beam excitation, manufactured by using the phosphor for an electron beam excitation, expressed by a composition formula MmAaBbOoNn:

Z (wherein the element M is at least one or more kind of element selected from the group consisting of Mg, Ca, Sr, Ba, and Zn, the element A is at least one or more 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 at least one or more kind of element selected from rare earth elements or transitional metal elements, satisfying o≧

0, n=2/3m+a+4/3b−

2/3o, m=a=b=1), wherein a phosphor coating amount is 7.0 mg/cm² or less per unit area.

6. A phosphor film for an electron beam excitation, manufactured by using the phosphor for an electron beam excitation, expressed by a general formula CaAlSiN₃:

Eu, wherein a phosphor coating amount is 7.0 mg/cm² or less per unit area.