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Electroluminescent device having improved light output

  • US 7,902,748 B2
  • Filed: 05/31/2007
  • Issued: 03/08/2011
  • Est. Priority Date: 05/31/2007
  • Status: Active Grant
First Claim
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1. An electroluminescent (EL) device, comprising:

  • a substrate;

    a light-emitting area formed over the substrate and comprising first and second electrodes and one or more EL unit(s) comprising at least one light-emitting layer formed between the electrodes, wherein at least one electrode comprises a transparent electrode;

    a cover located over the light-emitting area; and

    a light-scattering layer located between the substrate and cover, comprising transparent, light-scattering particles wherein the ratio of the volume of the transparent, light-scattering particles to the volume of the light-scattering layer is greater than 0.55 over the light-emitting area, wherein either the substrate or cover is transparent and transmits light emitted from the EL unit(s),wherein all the transparent, light-scattering particles in the light-scattering layer have a diameter of 0.5 to 2 microns.

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