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Organic electroluminescence element

  • US 20090218561A1
  • Filed: 02/19/2009
  • Published: 09/03/2009
  • Est. Priority Date: 03/03/2008
  • Status: Active Grant
First Claim
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1. An organic electroluminescence element comprising at least two light-emitting layers disposed between an anode and a cathode, wherein the at least two light-emitting layers include:

  • (1) a light-emitting layer A that contains an electron transporting light-emitting material and a hole transporting host material, wherein a concentration of the electron transporting light-emitting material gradually increases from an anode side toward a cathode side of the light-emitting layer A; and

    (2) a light-emitting layer B that contains a hole transporting light-emitting material and an electron transporting host material, wherein a concentration of the hole transporting light-emitting material gradually decreases from an anode side toward a cathode side of the light-emitting layer B.

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