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Electroluminescent devices

  • US 8,115,199 B2
  • Filed: 10/07/2008
  • Issued: 02/14/2012
  • Est. Priority Date: 03/13/1998
  • Status: Expired due to Fees
First Claim
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1. An electroluminescent device comprising:

  • a first charge carrier injecting layer for injecting positive charge carriers;

    a second charge carrier injecting layer for injecting negative charge carriers;

    an organic light-emissive layer located between the charge carrier injecting layers; and

    a plurality of positive charge carrier transport layers located between the light emissive layer and the positive charge carrier injecting layer;

    wherein a luminescent type II heterojunction is formed between one of the positive charge carrier transport layers and the light-emissive layer;

    wherein the plurality of positive charge carrier transport layers provide a series of intermediate energy steps between the light-emissive layer and the positive charge carrier injection layer.

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