US 12,010,861 B2
Light-emitting element, light-emitting device, display device, lighting device, and electronic device
Satoko Shitagaki, Kanagawa (JP); Takahiro Ishisone, Kanagawa (JP); Satoshi Seo, Kanagawa (JP); and Takeyoshi Watabe, Kanagawa (JP)
Assigned to Semiconductor Energy Laboratory Co., Ltd., (JP)
Filed by Semiconductor Energy Laboratory Co., Ltd., Kanagawa-ken (JP)
Filed on Oct. 4, 2019, as Appl. No. 16/593,215.
Application 16/593,215 is a continuation of application No. 14/277,450, filed on May 14, 2014, granted, now 10,439,156.
Claims priority of application No. 2013-104941 (JP), filed on May 17, 2013.
Prior Publication US 2020/0035940 A1, Jan. 30, 2020
Int. Cl. H10K 50/12 (2023.01); H10K 50/14 (2023.01); H10K 50/16 (2023.01); H10K 85/60 (2023.01)
CPC H10K 50/121 (2023.02) [H10K 50/14 (2023.02); H10K 50/16 (2023.02); H10K 85/615 (2023.02); H10K 85/654 (2023.02); H10K 85/6572 (2023.02)] 24 Claims
OG exemplary drawing
 
1. A light-emitting device comprising:
an anode;
a light-emitting layer over the anode, the light-emitting layer comprising a first substance and a phosphorescent substance;
an electron-transport layer over and in contact with the light-emitting layer, the electron-transport layer comprising a first organic compound;
a first layer over and in contact with the electron-transport layer, the first layer comprising a second organic compound; and
a cathode over the first layer,
wherein the first organic compound has an anthracene skeleton,
wherein at least two phenyl groups are bonded to the anthracene skeleton in the first organic compound,
wherein the second organic compound comprises a phenanthroline skeleton,
wherein the first organic compound has lower triplet excitation energy than the phosphorescent substance, and
wherein the first organic compound has a deeper LUMO level than the second organic compound.