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Light-emitting device having triplet and singlet compound in light-emitting layers

  • US 7,400,087 B2
  • Filed: 04/14/2005
  • Issued: 07/15/2008
  • Est. Priority Date: 06/05/2000
  • Status: Expired due to Term
First Claim
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1. A display comprising:

  • a display portion having a light emitting device, the light emitting device comprising a pixel portion, the pixel portion comprising;

    a first pixel including a first EL element for emitting a red light;

    a second pixel including a second EL element for emitting a green light; and

    a third pixel including a third EL element for emitting a blue light,wherein each of the first, second and third pixels comprises a switching thin film transistor and a current control thin film transistor; and

    wherein a triplet compound is used in the first EL element while a singlet compound is used in each of the second and third EL elements.

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