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OLEDs having increased external electroluminescence quantum efficiencies

  • US 7,012,363 B2
  • Filed: 01/10/2002
  • Issued: 03/14/2006
  • Est. Priority Date: 01/10/2002
  • Status: Expired due to Term
First Claim
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1. An OLED device comprising:

  • (a) a substrate;

    (b) an active region positioned over said substrate, wherein said active region comprises an anode layer, a cathode layer and a light-emitting layer disposed between the anode layer and the cathode layer; and

    (c) a composite barrier layer disposed over said active region or under said active region, said composite barrier layer comprising an alternating series of one or more polymeric planarizing sublayers and one or more high-density sublayers, at least one of said polymeric planarizing sublayers having microparticles incorporated therein, said microparticles being effective to increase the out-coupling efficiency of the OLED.

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