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Devices to increase OLED output coupling efficiency with a high refractive index substrate

  • US 9,640,781 B2
  • Filed: 02/26/2015
  • Issued: 05/02/2017
  • Est. Priority Date: 05/22/2014
  • Status: Active Grant
First Claim
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1. An organic light emitting diode (OLED) device comprising:

  • a high index substrate having an index of refraction of 1.5 or greater;

    a reflective electrode; and

    an organic emissive layer configured to emit light having a wavelength of λ

    ,wherein an optical distance between the organic emissive layer and the reflective electrode of the OLED is greater than λ

    /4 and less than 3λ

    /4, and wherein a range of the optical distance between the organic emissive layer and the reflective electrode is selected from the group consisting of;

    5% to 50% larger than λ

    /4 and 5% to 10% shorter than 3λ

    /4.

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