US 12,219,873 B2
Light-emitting element, light-emitting device, electronic device, and lighting device
Satoshi Seo, Kanagawa (JP); Tsunenori Suzuki, Kanagawa (JP); and Naoaki Hashimoto, Kanagawa (JP)
Assigned to Semiconductor Energy Laboratory Co., Ltd., (JP)
Filed by Semiconductor Energy Laboratory Co., Ltd., Kanagawa-ken (JP)
Filed on Jan. 23, 2024, as Appl. No. 18/420,214.
Application 18/420,214 is a continuation of application No. 17/392,842, filed on Aug. 3, 2021, granted, now 11,889,759.
Application 17/392,842 is a continuation of application No. 16/381,612, filed on Apr. 11, 2019, granted, now 11,088,335, issued on Aug. 10, 2021.
Application 16/381,612 is a continuation of application No. 15/154,121, filed on May 13, 2016, granted, now 10,263,194, issued on Apr. 16, 2019.
Claims priority of application No. 2015-099866 (JP), filed on May 15, 2015; and application No. 2016-049620 (JP), filed on Mar. 14, 2016.
Prior Publication US 2024/0164209 A1, May 16, 2024
Int. Cl. H01L 51/50 (2006.01); H10K 50/11 (2023.01); H10K 50/155 (2023.01); H10K 50/16 (2023.01); H10K 50/84 (2023.01); H10K 85/60 (2023.01); H10K 101/30 (2023.01); H10K 101/40 (2023.01)
CPC H10K 85/6572 (2023.02) [H10K 50/11 (2023.02); H10K 50/155 (2023.02); H10K 50/166 (2023.02); H10K 50/841 (2023.02); H10K 85/615 (2023.02); H10K 85/654 (2023.02); H10K 2101/30 (2023.02); H10K 2101/40 (2023.02)] 8 Claims
OG exemplary drawing
 
1. A light-emitting element comprising:
an anode;
a cathode; and
an EL layer between the anode and the cathode,
wherein the EL layer comprises a light-emitting layer, a first electron-transport layer, and a second electron-transport layer,
wherein the first electron-transport layer is between the light-emitting layer and the second electron-transport layer,
wherein the light-emitting layer has a region in contact with the first electron-transport layer,
wherein the second electron-transport layer has a region in contact with the first electron-transport layer,
wherein the light-emitting layer comprises a fluorescent substance and a host material,
wherein the first electron-transport layer comprises a first material,
wherein the second electron-transport layer comprises a second material,
wherein a LUMO level of the host material is higher than a LUMO level of the first material,
wherein a LUMO level of the second material is higher than the LUMO level of the first material,
wherein the host material is a substance including an anthracene skeleton,
wherein the first material is a substance comprising any one of a dibenzoquinoxaline skeleton, a dibenzoquinazoline skeleton, and a pyrimidine skeleton, and
wherein the second material is a substance comprising any of a phenanthroline skeleton, a bipyridine skeleton and a pyridine skeleton.