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Organic electroluminescent materials and devices

  • US 9,450,198 B2
  • Filed: 04/15/2014
  • Issued: 09/20/2016
  • Est. Priority Date: 04/15/2014
  • Status: Active Grant
First Claim
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1. A device, comprisingan anode;

  • a cathode; and

    an organic emissive layer disposed between the anode and the cathode comprising;

    a host;

    a first compound capable of phosphorescent emission at room temperature present in an amount less than 3 weight %, the first compound having a global maximum in its visible emission spectrum at a first wavelength;

    a second compound capable of phosphorescent emission at room temperature, the second compound having a global maximum in its visible emission spectrum at a second wavelength, the first wavelength longer than the second wavelength;

    wherein the first compound, the second compound and the host are mixed in the emissive layer; and

    a suppression mechanism capable of preferentially reducing emission of light emitted by the second compound;

    wherein the difference between the first wavelength and the second wavelength is between 0 nm and 80 nm.

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