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Method of making electroluminescent devices having varying electrical and/or optical properties

  • US 6,558,219 B1
  • Filed: 09/06/2000
  • Issued: 05/06/2003
  • Est. Priority Date: 03/13/1998
  • Status: Expired due to Term
First Claim
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1. A method of forming an electroluminescent device, comprising the steps of:

  • forming a first charge carrier injecting layer for injecting charge carriers of a first polarity;

    forming an organic charge carrier transport layer over the first charge carrier injecting layer, the transport layer having an electronic property and/or an optical property which varies across the thickness of the transport layer;

    forming an organic light emissive layer over the transport layer; and

    forming a second charge carrier injecting layer over the light emissive layer for injecting charge carriers of a second polarity.

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