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Organic EL multi-color light-emitting device

  • US 10,276,637 B2
  • Filed: 05/09/2012
  • Issued: 04/30/2019
  • Est. Priority Date: 05/13/2011
  • Status: Active Grant
First Claim
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1. An organic EL multi-color light-emitting device comprising a substrate, and a first light-emitting element and a second light-emitting element arranged on the surface of the substrate;

  • the first light-emitting element comprising, between an anode and a cathode, a first organic layer, a second organic layer and a third organic layer in this sequence in a direction perpendicular to the surface of the substrate;

    the second light-emitting element comprising, between an anode and a cathode, a second organic layer and a third organic layer in this sequence in a direction perpendicular to the surface of the substrate;

    the second organic layer of the first light-emitting element and the second organic layer of the second light-emitting element comprise the same compound, and the third organic layer of the first light-emitting element and the third organic layer of the second light-emitting element may be the same or different;

    the first organic layer comprising a first light-emitting dopant;

    the third organic layer of the first light-emitting element and the third organic layer of the second light-emitting element comprising a second light-emitting dopant, and the third organic layer of the first light-emitting element is an electron-injecting and/or electron-transporting layer;

    the second organic layer of the first light-emitting element and the second organic layer of the second light-emitting element comprising any of the following compounds (A) to (D);

    (A) a compound comprising an arylamine site, and a furan site or a thiophene site,(B) a compound comprising an arylamine site and a site comprising a nitrogen-containing six-membered ring structure,(C) a compound comprising a carbazole site, and a furan site or a thiophene site, and(D) a compound comprising a carbazole site and a site comprising a nitrogen-containing six membered ring structure,wherein the first and second light-emitting elements emit different color light, andthe thickness of the second organic layer of the first light-emitting element is the same as the thickness of the second organic layer of the second light-emitting element.

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