US 11,943,944 B2
Light-emitting device, light-emitting apparatus, electronic device, and lighting device
Yusuke Takita, Kanagawa (JP); Tsunenori Suzuki, Kanagawa (JP); Naoaki Hashimoto, Kanagawa (JP); Takumu Okuyama, Kanagawa (JP); and Satoshi Seo, Kanagawa (JP)
Assigned to Semiconductor Energy Laboratory Co., Ltd., (JP)
Appl. No. 17/423,665
Filed by Semiconductor Energy Laboratory Co., Ltd., Kanagawa-ken (JP)
PCT Filed Jan. 16, 2020, PCT No. PCT/IB2020/050320
§ 371(c)(1), (2) Date Jul. 16, 2021,
PCT Pub. No. WO2020/152547, PCT Pub. Date Jul. 30, 2020.
Claims priority of application No. 2019-008234 (JP), filed on Jan. 22, 2019.
Prior Publication US 2022/0115615 A1, Apr. 14, 2022
Int. Cl. H10K 50/11 (2023.01); H10K 85/60 (2023.01); H10K 101/30 (2023.01); H10K 101/40 (2023.01)
CPC H10K 50/11 (2023.02) [H10K 85/6574 (2023.02); H10K 2101/30 (2023.02); H10K 2101/40 (2023.02)] 23 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 first layer, a second layer, a third layer, and a light-emitting layer in this order from the anode side,
wherein the first layer comprises a first organic compound and a second organic compound,
wherein the second layer comprises a third organic compound,
wherein the third layer comprises a fourth organic compound,
wherein the light-emitting layer comprises a fifth organic compound and an emission center substance,
wherein the first organic compound exhibits an electron-accepting property with respect to the second organic compound, and
wherein a difference between a HOMO level of the fourth organic compound and a HOMO level of the fifth organic compound is less than or equal to 0.24 eV.