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Phosphorescent oled having double exciton-blocking layers

  • US 8,034,465 B2
  • Filed: 06/20/2007
  • Issued: 10/11/2011
  • Est. Priority Date: 06/20/2007
  • Status: Active Grant
First Claim
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1. An organic light-emitting device comprising:

  • a. an anode;

    b. a cathode;

    c. a hole-transporting layer disposed between the anode and the cathode;

    d. a phosphorescent light-emitting layer disposed between the hole-transporting layer and the cathode, wherein the phosphorescent light-emitting layer includes at least one host and at least one phosphorescent dopant;

    e. a first exciton-blocking layer disposed between the hole-transporting layer and the phosphorescent light-emitting layer;

    wherein the first exciton-blocking layer includes a first exciton-blocking material that has a triplet energy greater than the triplet energy of the host in the phosphorescent light-emitting layer; and

    f. a second exciton-blocking layer disposed between the first exciton-blocking layer and the phosphorescent light-emitting layer, wherein the second exciton-blocking layer is in contact with the phosphorescent light-emitting layer, and wherein the second exciton-blocking layer includes a second exciton-blocking material that has a triplet energy less than the triplet energy of the first exciton-blocking material,wherein the first exciton-blocking material and the second exciton-blocking material are different carbazole derivatives represented by formula (J);

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