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Light-emitting device configured to emit light by a creeping discharge of an emitter

  • US 7,830,077 B2
  • Filed: 04/06/2006
  • Issued: 11/09/2010
  • Est. Priority Date: 04/07/2005
  • Status: Expired due to Fees
First Claim
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1. A light-emitting device comprising:

  • a first insulator, including a plurality of portions that are arranged so as to face each other;

    an emitter, which includes fluorescent particles and which is arranged in a space that is defined by those portions of the first insulator, wherein the emitter has a porous surface layer and is configured to emit light by a creeping discharge of the emitter, the creeping discharge being an electrical discharge that is produced in the porous surface layer of the emitter;

    a second insulator, which functions as a base for the first insulator and the emitter;

    a plurality of electrodes to generate an electric field in the space and the porous surface layer of the emitter; and

    a substrate, which faces the second insulator with the emitter interposed between them, wherein the ratio A2/A1 of the cross-sectional area A2 of the emitter to the cross-sectional area A1 of a range surrounded with the first and second insulators and the substrate is greater than 0.4 but less than 1, the cross-sectional area A2 of the emitter and the cross-sectional area A1 of the range being on a plane that is perpendicular to the surface of the second insulator and that passes the center of the space.

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