ZINC OXIDE PHOSPHOR, PROCESS FOR PRODUCING THE SAME AND LIGHT EMITTING DEVICE

Title:

ZINC OXIDE PHOSPHOR, PROCESS FOR PRODUCING THE SAME AND LIGHT EMITTING DEVICE

Document Type and Number:

WIPO Patent Application WO/2004/096949

Kind Code:

A1

Abstract:

A zinc oxide phosphor characterized by emitting visible radiation with a broad emission spectrum close to white; and a process for producing the same. The process is characterized in that the luminous efficiency of zinc oxide phosphor is enhanced by subjecting powder obtained by mixing multiple additives with zinc oxide and effecting heat treatment of the mixture further to hydrogenation. The zinc oxide phosphor capable of broad luminescence covering a wide wavelength range over substantially all the region of visible radiation can find application in a white diode, a white vacuum fluorescent character display tube or a fluorescent paint.

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Inventors:

OHASHI NAOKI (JP)
ISHIGAKI TAKAMASA (JP)
TAGUCHI HIROYUKI (JP)
SAKAGUCHI ISAO (JP)
HANEDA HAJIME (JP)
SEKIGUCHI TAKASHI (JP)

Application Number:

PCT/JP2004/006402

Publication Date:

November 11, 2004

Filing Date:

April 30, 2004

Export Citation:

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Assignee:

NAT INST FOR MATERIALS SCIENCE (JP)
OHASHI NAOKI (JP)
ISHIGAKI TAKAMASA (JP)
TAGUCHI HIROYUKI (JP)
SAKAGUCHI ISAO (JP)
HANEDA HAJIME (JP)
SEKIGUCHI TAKASHI (JP)

International Classes:

C09K11/08; C09K11/54; C09K11/62; H01J63/04; (IPC1-7): C09K11/54; C09K11/08; H01J63/04

Foreign References:

JP2003231878A	2003-08-19
JP2003051609A	2003-02-21
JPH103990A	1998-01-06
JPH10245550A	1998-09-14
JP2920207B2	1999-07-19

Other References:

EBISAWA N. ET AL.: "Sanka aen eno lithium alminum kyo-doping koka no kento", THE CERAMIC SOCIETY OF JAPAN, vol. 2002, 24 March 2002 (2002-03-24), pages 170, XP002983532
OHASHI N. ET AL.: "Kyo-dope shita ZnO no denki dendosei to hakko tokusei", THE JAPAN SOCIETY OF APPLIED PHYSICS, vol. 63, no. 1, 24 September 2002 (2002-09-24), pages 265, XP002983533
See also references of EP 1630218A4

Attorney, Agent or Firm:

Nishi, Yoshiyuki (Suite 211 26-32, Nakahara 4-chom, Isogo-ku Yokohama-shi Kanagawa 36, JP)

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