US 11,723,264 B2
Light-emitting element, light-emitting device, electronic appliance, and lighting device
Tsunenori Suzuki, Kanagawa (JP); Naoaki Hashimoto, Kanagawa (JP); Eriko Saijo, Kanagawa (JP); and Satoshi Seo, Kanagawa (JP)
Assigned to Semiconductor Energy Laboratory Co., Ltd.
Filed by Semiconductor Energy Laboratory Co., Ltd., Kanagawa-ken (JP)
Filed on Mar. 11, 2021, as Appl. No. 17/198,566.
Application 17/198,566 is a continuation of application No. 15/882,178, filed on Jan. 29, 2018, abandoned.
Application 15/882,178 is a continuation of application No. 14/226,360, filed on Mar. 26, 2014, granted, now 9,893,303, issued on Feb. 13, 2018.
Claims priority of application No. 2013-065394 (JP), filed on Mar. 27, 2013.
Prior Publication US 2021/0202866 A1, Jul. 1, 2021
Int. Cl. H01L 51/00 (2006.01); H01L 51/50 (2006.01); H10K 85/30 (2023.01); H10K 50/11 (2023.01); H10K 50/13 (2023.01); H10K 50/16 (2023.01); H10K 101/10 (2023.01); H10K 85/60 (2023.01); H10K 101/00 (2023.01); H10K 101/30 (2023.01)
CPC H10K 85/342 (2023.02) [H10K 50/11 (2023.02); H10K 50/13 (2023.02); H10K 50/16 (2023.02); H10K 85/622 (2023.02); H10K 85/631 (2023.02); H10K 85/633 (2023.02); H10K 85/6572 (2023.02); H10K 85/6576 (2023.02); H10K 2101/10 (2023.02); H10K 2101/27 (2023.02); H10K 2101/30 (2023.02); H10K 2101/90 (2023.02)] 19 Claims
OG exemplary drawing
 
1. A light-emitting device comprising:
a first light-emitting element comprising a first light-emitting layer; and
a second light-emitting element comprising a second light-emitting layer,
wherein the first light-emitting element and the second light-emitting element comprise an electron-transport layer,
wherein the first light-emitting layer comprises a first phosphorescent material, a first organic material and a second organic material,
wherein the second light-emitting layer comprises a fluorescent material and a third organic material,
wherein the electron-transport layer comprises a fourth organic material,
wherein the first light-emitting layer and the second light-emitting layer are each in contact with the electron-transport layer positioned on a cathode side,
wherein a triplet excitation energy of the fourth organic material is lower than a triplet excitation energy of the first organic material,
wherein the first organic material and the second organic material form an exciplex,
wherein the second organic material comprises a carbazole skeleton, and
wherein the fourth organic material comprises a first anthracene derivative.