	US 12,279,470 B2
	Electroluminescent device, display substrate, and display apparatus
Dong Li, Beijing (CN)
Assigned to Beijing BOE Technology Development Co., Ltd., Beijing (CN); and BOE Technology Group Co., Ltd., Beijing (CN)
Appl. No. 17/764,425
Filed by Beijing BOE Technology Development Co., Ltd., Beijing (CN); and BOE Technology Group Co., Ltd., Beijing (CN)
PCT Filed May 12, 2021, PCT No. PCT/CN2021/093301 § 371(c)(1), (2) Date Mar. 28, 2022, PCT Pub. No. WO2021/254038, PCT Pub. Date Dec. 23, 2021.
Claims priority of application No. 20201055558.1 (CN), filed on Jun. 17, 2020.
Prior Publication US 2022/0344604 A1, Oct. 27, 2022
Int. Cl. H01L 51/50 (2006.01); H01L 51/56 (2006.01); H10K 50/00 (2023.01); H10K 50/11 (2023.01); H10K 50/115 (2023.01); H10K 71/00 (2023.01); H10K 85/30 (2023.01); H10K 101/30 (2023.01); H10K 101/40 (2023.01)

CPC H10K 50/00 (2023.02) [H10K 50/11 (2023.02); H10K 50/115 (2023.02); H10K 71/00 (2023.02); H10K 85/322 (2023.02); H10K 85/342 (2023.02); H10K 85/344 (2023.02); H10K 85/371 (2023.02); H10K 2101/30 (2023.02); H10K 2101/40 (2023.02)]

14 Claims

1. An electroluminescent device, comprising:

an electron transport layer and a quantum dot light emitting layer that are stacked; and

an ionic complex layer between the electron transport layer and the quantum dot light emitting layer, wherein a built-in electric field is in the ionic complex layer;

wherein the quantum dot light emitting layer comprises a quantum dot, a ligand and a charge balance ion;

wherein a group at one end, close to the quantum dot, of the ligand is connected with the quantum dot, a group, at another end, away from the quantum dot, of the ligand is an ionic complex of the ionic complex layer, and the ionic complex has charges with opposite polarity to chargers in the charge balance ion;

wherein a material of the ionic complex layer is an organic metal complex.