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Organic light emitting device structure for obtaining chromaticity stability

  • US 7,211,823 B2
  • Filed: 01/20/2004
  • Issued: 05/01/2007
  • Est. Priority Date: 07/10/2003
  • Status: Expired due to Term
First Claim
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1. An organic light emitting device comprising:

  • an anode;

    an emissive region; and

    a cathode,wherein the emissive region comprises;

    a first emissive layer, comprising a first host material and a first emissive material, anda second emissive layer in physical contact with the first emissive layer and comprising a second host material and a second emissive material,and wherein;

    the first emissive layer is nearer to the anode than the second emissive layer, and at least one of the first emissive material or the second emissive material is a phosphorescent emissive material.

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