US 12,127,479 B2
Light-emitting element, light-emitting device, electronic device, lighting device, and organic compound
Satoshi Seo, Kanagawa (JP); Takao Hamada, Kanagawa (JP); Tatsuyoshi Takahashi, Kanagawa (JP); Yasushi Kitano, Kanagawa (JP); Hiroki Suzuki, Kanagawa (JP); and Hideko Inoue, Kanagawa (JP)
Assigned to Semiconductor Energy Laboratory Co., Ltd., (JP)
Filed by Semiconductor Energy Laboratory Co., Ltd., Kanagawa-ken (JP)
Filed on Oct. 19, 2023, as Appl. No. 18/381,846.
Application 18/381,846 is a continuation of application No. 18/094,154, filed on Jan. 6, 2023, granted, now 11,800,799.
Application 18/094,154 is a continuation of application No. 16/570,062, filed on Sep. 13, 2019, granted, now 11,552,256, issued on Jan. 10, 2023.
Application 16/570,062 is a continuation of application No. 15/988,152, filed on May 24, 2018, granted, now 10,418,565, issued on Sep. 17, 2019.
Application 15/988,152 is a continuation of application No. 14/807,426, filed on Jul. 23, 2015, granted, now 9,985,221, issued on May 29, 2018.
Claims priority of application No. 2014-151493 (JP), filed on Jul. 25, 2014.
Prior Publication US 2024/0147852 A1, May 2, 2024
Int. Cl. H01L 51/50 (2006.01); C07D 403/14 (2006.01); H10K 85/60 (2023.01); H10K 85/30 (2023.01)
CPC H10K 85/6572 (2023.02) [C07D 403/14 (2013.01); H10K 85/342 (2023.02); H10K 85/633 (2023.02); H10K 85/636 (2023.02); Y02P 20/582 (2015.11)] 18 Claims
OG exemplary drawing
 
2. A light-emitting element comprising:
a light-emitting layer between an anode and a cathode,
wherein the light-emitting layer comprises a first organic compound, a second organic compound, and a phosphorescent compound,
wherein the first organic compound and the second organic compound form an exciplex,
wherein the first organic compound comprises a 6-membered nitrogen-containing heteroaromatic ring and a carbazole skeleton and does not comprise a triarylamine skeleton,
wherein the 6-membered nitrogen-containing heteroaromatic ring is pyrazine, pyridazine, triazine, or tetrazine,
wherein a HOMO level of the first organic compound is lower than a HOMO level of the second organic compound, and
wherein a difference between the HOMO level of the first organic compound and the HOMO level of the second organic compound is less than or equal to 0.4 eV.