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Light-Emitting Element, Lighting Device, Light-Emitting Device, and Electronic Device

  • US 20170317306A1
  • Filed: 05/15/2017
  • Published: 11/02/2017
  • Est. Priority Date: 05/17/2013
  • Status: Active Grant
First Claim
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1. A light-emitting element comprising:

  • a first electrode;

    a first light-emitting layer over the first electrode, the first light-emitting layer comprising a first phosphorescent compound and a first host material;

    a second light-emitting layer over the first light-emitting layer, the second light-emitting layer comprising a second phosphorescent compound and a second host material;

    a third light-emitting layer over the second light-emitting layer, the third light-emitting layer comprising a third phosphorescent compound and a third host material; and

    a second electrode over the third light-emitting layer,wherein between a peak of an emission spectrum of the first phosphorescent compound, a peak of an emission spectrum of the second phosphorescent compound, and a peak of an emission spectrum of the third phosphorescent compound, the peak of the emission spectrum of the second phosphorescent compound is on a longest wavelength side and the peak of the emission spectrum of the third phosphorescent compound is on a shortest wavelength side, andwherein the third host material has higher triplet excitation energy than the first host material and the second host material.

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