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Light-emitting element

  • US 10,586,934 B2
  • Filed: 01/30/2019
  • Issued: 03/10/2020
  • Est. Priority Date: 02/16/2011
  • Status: Active Grant
First Claim
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1. A light-emitting element comprising:

  • a pair of electrodes; and

    a light-emitting layer comprising a phosphorescent compound, a first organic compound and a second organic compound between the pair of electrodes,wherein the first organic compound and the second organic compound are selected so as to form an exciplex,wherein an emission spectrum of the exciplex overlaps with a longest wavelength side absorption band in an absorption spectrum of the phosphorescent compound,wherein one of the first organic compound and the second organic compound is a carbazole compound,wherein the carbazole compound comprises a carbazol-3-yl group, andwherein an absolute value of a difference between an energy value of a peak of the emission spectrum and an energy value of a peak of the longest wavelength side absorption band in the absorption spectrum is 0.2 eV or less.

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