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    • 67. 发明公开
    • LIGHT-EMITTING ELEMENT
    • EP3618133A1
    • 2020-03-04
    • EP18791146.6
    • 2018-04-20
    • Sumitomo Chemical Company Limited
    • INAKAZU, ShinichiUSUI, MotoakiTANAKA, Masanobu
    • H01L51/50C09K11/06
    • To provide a light emitting device excellent in luminance life.
      A light emitting device having
      an anode, a cathode,
      a first layer containing a compound represented by the formula (C-1), disposed between the anode and the cathode,
      a second layer containing at least one selected from a simple substance composed only of an alkali metal element, a simple substance composed only of a group 2 element, a compound containing an alkali metal element and a compound containing a group 2 element (simple substance or compound of second layer), disposed between the first layer and the cathode, and
      a third layer containing at least one selected from a simple substance composed only of an alkali metal element, a simple substance composed only of a group 2 element, a compound containing an alkali metal element and a compound containing a group 2 element (simple substance or compound of third layer), disposed between the second layer and the cathode in contact with the cathode,
      wherein at least one simple substance or compound of the second layer and at least one simple substance or compound of the third layer are mutually different:

      [Ring R 1C to Ring R 4C represent an aromatic hydrocarbon ring and the like, and R C represents a carbon atom and the like.].