公开(公告)号：US20190245146A1

公开(公告)日：2019-08-08

申请号：US16385472

申请日：2019-04-16

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Satoshi Seo ,  Tatsuyoshi Takahashi ,  Kyoko Takeda ,  Kenta Abe ,  Hiroki Suzuki

IPC: H01L51/00 ,  G06F3/041 ,  C07F15/00 ,  H01L51/50 ,  H01L27/32 ,  H05B33/20 ,  H05B33/14 ,  C09K11/06 ,  G06F3/045

Abstract: A light-emitting element with a lower voltage and higher emission efficiency is provided. The light-emitting element includes a first organic compound, a second organic compound, and a guest material. The LUMO level of the first organic compound is lower than the LUMO level of the second organic compound, and a difference between them is larger than 0 eV and smaller than or equal to 0.5 eV. Furthermore, the HOMO level of the first organic compound is lower than the HOMO level of the second organic compound. The guest material has a function of converting triplet excitation energy into light emission. The first organic compound and the second organic compound form an exciplex.