• Patent Title: Electroluminiscent element having a high effient light output
  • Application No.: US13124023
    Application Date: 2009-10-15
  • Publication No.: US09887388B2
    Publication Date: 2018-02-06
  • Inventor: Masayuki Naya
  • Applicant: Masayuki Naya
  • Applicant Address: IE Dublin
  • Assignee: UDC Ireland Limited
  • Current Assignee: UDC Ireland Limited
  • Current Assignee Address: IE Dublin
  • Agency: Riverside Law LLP
  • Priority: JP2008-269011 20081017
  • International Application: PCT/JP2009/068151 WO 20091015
  • International Announcement: WO2010/044489 WO 20100422
  • Main IPC: H01L33/00
  • IPC: H01L33/00 H01L51/52
Electroluminiscent element having a high effient light output
Abstract:
A light emitting element includes an anode, a light transmitting cathode, and a light emitting layer sandwiched therebetween, formed on a surface of a substrate. Light emitted by the light emitting layer by voltage being applied between the electrodes is output from a surface toward the side of the light transmitting electrode. A light scattering layer for scattering evanescent light generated at the surface is provided on the surface of the light transmitting electrode. The light scattering layer has a first scattering portion having an uneven structure and a lower refractive index than the light emitting layer, and second scattering portions that fill at least the bottoms of recesses of the uneven structure and has a different refractive index from the first scattering portion. The distance between the bottoms of the recesses and the surface of the light transmitting electrode is a seepage depth of the evanescent light or less.
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