US 12,317,668 B2
Light-emitting device, light-emitting apparatus, electronic device, and lighting device
Satoshi Seo, Kanagawa (JP); Hiroshi Kadoma, Kanagawa (JP); Takumu Okuyama, Tokyo (JP); Naoaki Hashimoto, Kanagawa (JP); Yusuke Takita, Kanagawa (JP); and Tsunenori Suzuki, Kanagawa (JP)
Assigned to Semiconductor Energy Laboratory Co., Ltd., Atsugi (JP)
Appl. No. 17/610,760
Filed by SEMICONDUCTOR ENERGY LABORATORY CO., LTD., Atsugi (JP)
PCT Filed May 7, 2020, PCT No. PCT/IB2020/054305
§ 371(c)(1), (2) Date Nov. 12, 2021,
PCT Pub. No. WO2020/234680, PCT Pub. Date Nov. 26, 2020.
Claims priority of application No. 2019-094017 (JP), filed on May 17, 2019; and application No. 2019-216119 (JP), filed on Nov. 29, 2019.
Prior Publication US 2022/0069246 A1, Mar. 3, 2022
Int. Cl. H10K 50/11 (2023.01); H10K 50/15 (2023.01); H10K 50/16 (2023.01); H10K 50/17 (2023.01); H10K 101/30 (2023.01); H10K 101/40 (2023.01)
CPC H10K 50/11 (2023.02) [H10K 50/15 (2023.02); H10K 50/16 (2023.02); H10K 50/171 (2023.02); H10K 2101/30 (2023.02); H10K 2101/40 (2023.02)] 24 Claims
OG exemplary drawing
 
1. A light-emitting device comprising:
an anode;
a cathode; and
an EL layer between the anode and the cathode,
wherein the EL layer comprises a hole-injection layer, a light-emitting layer, and an electron-transport layer from the anode side,
wherein the hole-injection layer is in contact with the anode,
wherein the hole-injection layer comprises a first substance and a second substance,
wherein the first substance is an organic compound having an electron-withdrawing group,
wherein the second substance has a HOMO level higher than or equal to −5.7 eV and lower than or equal to −5.4 eV,
wherein the light-emitting layer comprises a third substance and a fourth substance, the third substance being a light-emitting substance and the fourth substance being a host material,
wherein the electron-transport layer comprises a first electron-transport layer and a second electron-transport layer,
wherein the first electron-transport layer is in contact with the light-emitting layer,
wherein the first electron-transport layer comprises a fifth substance,
wherein the second electron-transport layer comprises a sixth substance,
wherein the fifth substance is an electron-transport material,
wherein the sixth substance is a metal, a metal salt, a metal oxide, or a metal complex, and
wherein a first LUMO level of the fifth substance is lower than a second LUMO level of the fourth substance and a difference between the first LUMO level and the second LUMO level is greater than or equal to 0.15 eV and less than or equal to 0.40 eV.