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Light-emitting element

  • US 8,994,263 B2
  • Filed: 02/10/2012
  • Issued: 03/31/2015
  • 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 guest material and a host material between the pair of electrodes,wherein an emission spectrum of the host material overlaps with a longest-wavelength-side absorption band in an absorption spectrum of the guest material, andwherein phosphorescence is emitted by conversion of an excitation energy of the host material into an excitation energy of the guest material, andwherein a difference between an energy value of a peak of the emission spectrum and an energy value of a peak of the lowest-energy-side absorption band in the absorption spectrum is 0.3 eV or less.

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