US 12,238,950 B2
Electroluminescent device, manufacturing method thereof, and display apparatus
Xin Zhang, Beijing (CN)
Assigned to BOE Technology Group Co., Ltd., Beijing (CN)
Filed by BOE Technology Group Co., Ltd., Beijing (CN)
Filed on Apr. 26, 2023, as Appl. No. 18/307,096.
Application 18/307,096 is a continuation of application No. 17/400,457, filed on Aug. 12, 2021, granted, now 11,690,240.
Application 17/400,457 is a continuation of application No. 16/759,779, granted, now 11,121,340, issued on Sep. 14, 2021, previously published as PCT/CN2019/101356, filed on Aug. 19, 2019.
Claims priority of application No. 201811223778.3 (CN), filed on Oct. 19, 2018.
Prior Publication US 2023/0269956 A1, Aug. 24, 2023
Int. Cl. H01L 51/50 (2006.01); H10K 30/80 (2023.01); H10K 50/11 (2023.01); H10K 50/115 (2023.01); H10K 50/15 (2023.01); H10K 50/16 (2023.01); H10K 71/00 (2023.01); H10K 101/40 (2023.01)
CPC H10K 50/15 (2023.02) [H10K 30/865 (2023.02); H10K 50/11 (2023.02); H10K 50/115 (2023.02); H10K 50/16 (2023.02); H10K 71/00 (2023.02); H10K 2101/40 (2023.02)] 11 Claims
OG exemplary drawing
 
1. An electroluminescent device, comprising an anode layer, a light emitting layer, a cathode layer, a hole transport layer between the anode layer and the light emitting layer, and an electron transport layer between the cathode layer and the light emitting layer, wherein the electroluminescent device further comprises:
an intermediate layer between the light emitting layer and the hole transport layer, and/or between the light emitting layer and the electron transport layer;
wherein the intermediate layer comprises a quantum dot film or a perovskite polycrystalline film, quantum dots in the quantum dot film have a size between 2 nm and 20 nm, and perovskite polycrystalline grains in the perovskite polycrystalline film have a size of 2 nm to 1000 nm,
wherein the light emitting layer comprises quantum dots, and a light-emitting peak of the quantum dots in the intermediate layer or a light-emitting peak of the perovskite polycrystalline grains in the intermediate layer is different from a light-emitting peak of the quantum dots in the light emitting layer.