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Light-emitting element, light-emitting device, and electronic device

  • US 8,415,878 B2
  • Filed: 07/03/2006
  • Issued: 04/09/2013
  • Est. Priority Date: 07/06/2005
  • Status: Active Grant
First Claim
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1. A light-emitting element comprising:

  • a first electrode;

    a second electrode;

    a light-emitting layer interposed between the first electrode and the second electrode, wherein;

    the light-emitting layer includes at least a first layer, a second layer and a third layer,the first layer includes a substance to be an emission center dispersed in a host material,the second layer includes the substance dispersed in the host material, andthe third layer is interposed between the first layer and the second layer; and

    a fourth layer comprising an organic compound having hole transporting property and a metal compound the fourth layer between the light-emitting layer and one of the first electrode and the second electrode.

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