US 11,723,267 B2
Light emitting device and displaying device
Juanjuan You, Beijing (CN); and Linlin Wang, Beijing (CN)
Assigned to BOE TECHNOLOGY GROUP CO., LTD., Beijing (CN)
Filed by BOE Technology Group Co., Ltd., Beijing (CN)
Filed on Mar. 1, 2021, as Appl. No. 17/188,004.
Claims priority of application No. 202010712641.5 (CN), filed on Jul. 22, 2020.
Prior Publication US 2022/0029100 A1, Jan. 27, 2022
Int. Cl. H10K 85/60 (2023.01); H10K 50/12 (2023.01); H10K 50/15 (2023.01); H10K 50/17 (2023.01)
CPC H10K 85/631 (2023.02) [H10K 50/12 (2023.02); H10K 85/654 (2023.02); H10K 85/6572 (2023.02); H10K 50/15 (2023.02); H10K 50/171 (2023.02)] 20 Claims
OG exemplary drawing
 
1. A light emitting device, wherein the light emitting device comprises a first electrode, a second electrode, and a light emitting unit located between the first electrode and the second electrode, and the light emitting unit comprises a doped electron-barrier layer, a blue-light host layer and a doped blue-light host layer that are stacked;
the doped electron-barrier layer comprises an electron-barrier host material and a first guest material that is doped in the electron-barrier host material;
the blue-light host layer comprises a first blue-light host material;
the doped blue-light host layer comprises a second blue-light host material and a second guest material that is doped in the second blue-light host material; and
a singlet-state energy level of the first blue-light host material is higher than a singlet-state energy level of the first guest material and a singlet-state energy level of the second guest material.