US 11,672,136 B2
Light-emitting element, display module, lighting module, light-emitting device, display device, electronic appliance, and lighting device
Nobuharu Ohsawa, Kanagawa (JP); Yusuke Nonaka, Kanagawa (JP); Takahiro Ishisone, Kanagawa (JP); Satoshi Seo, Kanagawa (JP); and Takuya Kawata, Kanagawa (JP)
Assigned to Semiconductor Energy Laboratory Co., Ltd., Atsugi (JP)
Filed by SEMICONDUCTOR ENERGY LABORATORY CO., LTD., Atsugi (JP)
Filed on Feb. 18, 2021, as Appl. No. 17/178,417.
Application 17/178,417 is a continuation of application No. 16/454,296, filed on Jun. 27, 2019, granted, now 10,930,873.
Application 16/454,296 is a continuation of application No. 15/983,223, filed on May 18, 2018, granted, now 10,374,186, issued on Aug. 6, 2019.
Application 15/983,223 is a continuation of application No. 15/162,675, filed on May 24, 2016, granted, now 10,026,917, issued on Jul. 17, 2018.
Application 15/162,675 is a continuation of application No. 14/548,947, filed on Nov. 20, 2014, granted, now 9,362,517, issued on Jun. 7, 2016.
Claims priority of application No. 2013-249486 (JP), filed on Dec. 2, 2013; application No. 2014-097803 (JP), filed on May 9, 2014; and application No. 2014-180913 (JP), filed on Sep. 5, 2014.
Prior Publication US 2021/0193945 A1, Jun. 24, 2021
Int. Cl. H10K 50/13 (2023.01); H10K 50/11 (2023.01); H10K 59/32 (2023.01); H10K 50/12 (2023.01); H10K 50/15 (2023.01); H10K 50/16 (2023.01); H10K 85/30 (2023.01); H10K 101/00 (2023.01); H10K 85/60 (2023.01); H10K 102/00 (2023.01)
CPC H10K 50/131 (2023.02) [H10K 50/11 (2023.02); H10K 50/121 (2023.02); H10K 50/15 (2023.02); H10K 50/16 (2023.02); H10K 59/32 (2023.02); H10K 85/342 (2023.02); H10K 85/611 (2023.02); H10K 85/615 (2023.02); H10K 85/622 (2023.02); H10K 85/626 (2023.02); H10K 85/633 (2023.02); H10K 85/636 (2023.02); H10K 85/654 (2023.02); H10K 85/6572 (2023.02); H10K 85/6576 (2023.02); H10K 2101/10 (2023.02); H10K 2101/27 (2023.02); H10K 2101/90 (2023.02); H10K 2102/351 (2023.02)] 19 Claims
OG exemplary drawing
 
1. A light-emitting element comprising:
a pair of electrodes; and
an EL layer between the pair of electrodes,
wherein the EL layer comprises a first light-emitting layer, a second light-emitting layer, and a first layer between the first light-emitting layer and the second light-emitting layer,
wherein an emission spectrum of the first light-emitting layer is in a shorter wavelength region than an emission spectrum of the second light-emitting layer,
wherein the first light-emitting layer comprises a fluorescent substance and a host material,
wherein the fluorescent substance is capable of emitting light in the first light-emitting layer,
wherein the second light-emitting layer comprises a substance, a first organic compound and a second organic compound,
wherein the substance is capable of converting triplet excitation energy into luminescence in the second light-emitting layer,
wherein the first organic compound and the second organic compound are configured to form an exciplex,
wherein the fluorescent substance comprises a pyrene skeleton,
wherein the host material comprises a condensed aromatic ring, and
wherein a T1 level of the host material is lower than a T1 level of the first organic compound and a T1 level of the second organic compound.