Organic electroluminescent device

    公开(公告)号:US11450817B2

    公开(公告)日:2022-09-20

    申请号:US17071719

    申请日:2020-10-15

    申请人: KYULUX, INC.

    IPC分类号: H01L51/00 H01L51/50 C09K11/06

    摘要: An organic electroluminescent device having an anode, a cathode, and a light emitting layer between the anode and the cathode, in which the light emitting layer contains a first organic compound, a second organic compound, and a third organic compound that satisfy the following expression (A), the second organic compound is a delayed fluorescent material, and the third organic compound is a light emitting material, is capable of enhancing the light emission efficiency. ES1(A), ES1(B) and ES1(C) represent a lowest singlet excitation energy level of the first, second and third organic compound, respectively. ES1(A)>ES1(B)>ES1(C)  (A)