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

  • US 9,099,682 B2
  • Filed: 09/02/2010
  • Issued: 08/04/2015
  • Est. Priority Date: 09/07/2009
  • Status: Active Grant
First Claim
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1. A light-emitting element comprising:

  • n (n is a natural number of two or more) light-emitting layers between an anode and a cathode;

    a first layer between an m-th (in is a natural number, 1≦

    m≦

    n−

    1) light-emitting layer and an (m+1)-th light-emitting layer, wherein the first layer contains one selected from the group consisting of an alkali metal, an alkaline earth metal, a rare earth metal, an alkali metal compound, an alkaline earth metal compound, and a rare earth metal compound;

    a second layer between the first layer and the (m+1)-th light-emitting layer, wherein the second layer contains a substance having electron-transport property; and

    a charge-generation layer between the second layer and the (m+1)-th light-emitting layer, wherein the charge-generation layer contains a substance having hole-transport property and an acceptor substance,wherein the substance having hole-transport property is a carbazole derivative or aromatic hydrocarbon,wherein the acceptor substance is a transition metal oxide or an oxide of a metal belonging to any of Groups 4 to 8 of the periodic table,wherein a mass ratio of the acceptor substance to the substance having hole-transport property in the charge-generation layer is from 0.1;

    1 to 4.0;

    1, both inclusive, andwherein the substance having electron-transport property in the second layer is a perylene derivative or a nitrogen-containing condensed aromatic compound.

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