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Hybrid OLED having phosphorescent and fluorescent emitters

  • US 9,070,884 B2
  • Filed: 04/13/2005
  • Issued: 06/30/2015
  • Est. Priority Date: 04/13/2005
  • Status: Active Grant
First Claim
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1. An organic light emitting device comprising:

  • a cathode;

    a first emissive layer comprising a fluorescent blue emitting material as a dopant in a host material;

    a spacer layer;

    a second emissive layer comprising a phosphorescent emitting material as a dopant in a host material; and

    an anode;

    wherein, the spacer layer is between the first emissive layer and the second emissive layer, the spacer layer inhibits quenching of the triplet excitons in the second emissive layer;

    an interface between the spacer layer and the first emissive layer forms a heterojunction; and

    the spacer layer comprises a material that has a triplet energy that is higher than the triplet energy of the phosphorescent emitting material; and

    wherein a combined emission of the emitting materials gives a white emission from the device.

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