US 12,439,814 B2
Light-emitting element, light-emitting device, display device, electronic appliance, and lighting device
Satoshi Seo, Kanagawa (JP); Hiromi Seo, Kanagawa (JP); Tatsuyoshi Takahashi, Kanagawa (JP); and Takahiro Ishisone, Kanagawa (JP)
Assigned to Semiconductor Energy Laboratory Co., Ltd., (JP)
Filed by Semiconductor Energy Laboratory Co., Ltd., Kanagawa-ken (JP)
Filed on Mar. 15, 2024, as Appl. No. 18/606,779.
Application 18/606,779 is a continuation of application No. 17/733,025, filed on Apr. 29, 2022, granted, now 11,937,439.
Application 17/733,025 is a continuation of application No. 17/113,238, filed on Dec. 7, 2020, granted, now 11,322,709, issued on May 3, 2022.
Application 17/113,238 is a continuation of application No. 16/516,987, filed on Jul. 19, 2019, granted, now 10,862,059, issued on Dec. 8, 2020.
Application 16/516,987 is a continuation of application No. 15/592,485, filed on May 11, 2017, granted, now 10,361,389, issued on Jul. 23, 2019.
Application 15/592,485 is a continuation of application No. 14/738,112, filed on Jun. 12, 2015, granted, now 9,660,211, issued on May 23, 2017.
Application 14/738,112 is a continuation of application No. 13/955,904, filed on Jul. 31, 2013, granted, now 9,059,421, issued on Jun. 16, 2015.
Claims priority of application No. JP2012-173027 (JP), filed on Aug. 3, 2012.
Prior Publication US 2024/0276753 A1, Aug. 15, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H10K 85/60 (2023.01); H10K 50/11 (2023.01); H10K 50/13 (2023.01); H10K 50/81 (2023.01); H10K 50/82 (2023.01); H10K 85/30 (2023.01); H10K 101/00 (2023.01); H10K 101/10 (2023.01); H10K 101/20 (2023.01); H10K 101/25 (2023.01)
CPC H10K 85/342 (2023.02) [H10K 50/11 (2023.02); H10K 50/13 (2023.02); H10K 50/81 (2023.02); H10K 50/82 (2023.02); H10K 85/633 (2023.02); H10K 85/636 (2023.02); H10K 85/6572 (2023.02); H10K 85/6576 (2023.02); H10K 85/341 (2023.02); H10K 85/346 (2023.02); H10K 85/615 (2023.02); H10K 85/624 (2023.02); H10K 85/626 (2023.02); H10K 2101/10 (2023.02); H10K 2101/20 (2023.02); H10K 2101/25 (2023.02); H10K 2101/27 (2023.02); H10K 2101/90 (2023.02)] 18 Claims
OG exemplary drawing
 
1. A light-emitting element comprising:
an anode;
a hole-transport layer over the anode;
a first light-emitting layer over the hole-transport layer, the first light-emitting layer comprising a first organic compound and a phosphorescent compound;
a second light-emitting layer over and in contact with the first light-emitting layer, the second light-emitting layer comprising a second organic compound and a third organic compound;
an electron-transport layer over the second light-emitting layer; and
a cathode over the electron-transport layer,
wherein each of a triplet excited level of the second organic compound and the third organic compound is higher than a triplet excited level of the phosphorescent compound,
wherein a combination of the second organic compound and the third organic compound forms a first exciplex,
wherein light emitted from the first light-emitting layer has an emission peak at 600 nm to 700 nm, and
wherein light emitted from the second light-emitting layer has an emission peak at 500 nm to 600 nm.