公开(公告)号：US20240008355A1

公开(公告)日：2024-01-04

申请号：US18214796

申请日：2023-06-27

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Toshiki Sasaki ,  Hiromitsu Kido ,  Tsunenori Suzuki ,  Nobuharu Ohsawa ,  Hideko Yoshizumi ,  Satoshi Seo ,  Satoko Numata ,  Eriko Aoyama ,  Yui Yoshiyasu

IPC: H10K85/30 ,  C07F15/00 ,  C09K11/06

CPC classification number: H10K85/342 ,  C07F15/0033 ,  C09K11/06 ,  H10K50/11

Abstract: A light-emitting device includes a light-emitting layer containing a light-emitting substance and a first organic compound. The light-emitting substance is an organometallic complex containing a central metal and ligands. One of the ligands includes a skeleton formed by a ring A1 and a pyridine ring bonded to each other. The ring A1 represents an aromatic ring or a heteroaromatic ring. The pyridine ring includes an alkyl group having 1 to 6 carbon atoms and being substituted with deuterium. The first organic compound includes an electron-transport skeleton and first and second substituents that are bonded to the electron-transport skeleton. The electron-transport skeleton includes a heteroaromatic ring having two or more nitrogen atoms. The first substituent includes one or both of an aromatic ring and a heteroaromatic ring. The second substituent includes a skeleton having a hole-transport property. The lowest triplet excited state of the first organic compound is locally distributed in the first substituent.