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Light-emitting element, display module, lighting module, light-emitting device, display device, electronic appliance, and lighting device

  • US 10,026,917 B2
  • Filed: 05/24/2016
  • Issued: 07/17/2018
  • Est. Priority Date: 12/02/2013
  • Status: Active Grant
First Claim
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1. A light-emitting element comprising:

  • a pair of electrodes; and

    an EL layer between the pair of electrodes,wherein the EL layer comprises a first light-emitting layer, a second light-emitting layer, and a first layer between the first light-emitting layer and the second light-emitting layer,wherein an emission spectrum of the first light-emitting layer is in a shorter wavelength region than an emission spectrum of the second light-emitting layer,wherein the first light-emitting layer comprises a fluorescent substance and a host material,wherein the fluorescent substance emits light in the first light-emitting layer,wherein the second light-emitting layer comprises a substance capable of converting triplet excitation energy into light emission,wherein a singlet excited level of the host material is higher than a singlet excited level of the fluorescent substance, andwherein a triplet excited level of the host material is lower than a triplet excited level of the fluorescent substance.

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