US 12,336,369 B2
Light-emitting element, display device, electronic device, and lighting device each having thermally-activated delayed fluorescent organic compound
Nobuharu Ohsawa, Kanagawa (JP); and Satoshi Seo, Kanagawa (JP)
Assigned to Semiconductor Energy Laboratory Co., Ltd., (JP)
Filed by Semiconductor Energy Laboratory Co., Ltd., Kanagawa-ken (JP)
Filed on Apr. 4, 2024, as Appl. No. 18/626,690.
Application 18/626,690 is a continuation of application No. 18/138,250, filed on Apr. 24, 2023, granted, now 11,956,981.
Application 18/138,250 is a continuation of application No. 16/758,999, granted, now 11,637,263, issued on Apr. 25, 2023, previously published as PCT/IB2018/058227, filed on Oct. 23, 2018.
Claims priority of application No. 2017-213080 (JP), filed on Nov. 2, 2017.
Prior Publication US 2024/0381684 A1, Nov. 14, 2024
Int. Cl. H10K 50/12 (2023.01); C09K 11/02 (2006.01); C09K 11/06 (2006.01); H10K 50/16 (2023.01); H10K 50/13 (2023.01); H10K 50/19 (2023.01); H10K 59/12 (2023.01); H10K 59/40 (2023.01); H10K 85/30 (2023.01); H10K 85/60 (2023.01); H10K 101/00 (2023.01); H10K 101/30 (2023.01)
CPC H10K 50/121 (2023.02) [C09K 11/02 (2013.01); C09K 11/06 (2013.01); H10K 50/16 (2023.02); C09K 2211/1007 (2013.01); C09K 2211/1044 (2013.01); C09K 2211/185 (2013.01); H10K 50/131 (2023.02); H10K 50/19 (2023.02); H10K 59/12 (2023.02); H10K 59/40 (2023.02); H10K 85/342 (2023.02); H10K 85/60 (2023.02); H10K 85/615 (2023.02); H10K 85/622 (2023.02); H10K 85/626 (2023.02); H10K 85/636 (2023.02); H10K 85/654 (2023.02); H10K 85/657 (2023.02); H10K 85/6572 (2023.02); H10K 85/6576 (2023.02); H10K 2101/27 (2023.02); H10K 2101/30 (2023.02)] 18 Claims
OG exemplary drawing
 
1. A light-emitting device comprising:
a first electrode;
a light-emitting layer over the first electrode, the light-emitting layer comprising:
a first organic compound configured to emit phosphorescence;
a second organic compound comprising a π-electron rich skeleton and a x-electron deficient skeleton; and
a third organic compound configured to convert singlet excitation energy into light emission; and
a second electrode over the light-emitting layer,
wherein the light-emitting layer comprises a mixture of the first organic compound, the second organic compound, and the third organic compound,
wherein the third organic compound comprises at least two alkyl groups each having 2 or more carbon atoms.