US 12,454,538 B2
Stacked organic electroluminescent device
Jing Wang, Beijing (CN); Huiqing Pang, Beijing (CN); Zhihao Cui, Beijing (CN); Chi Yuen Raymond Kwong, Beijing (CN); and Chuanjun Xia, Beijing (CN)
Assigned to BEIJING SUMMER SPROUT TECHNOLOGY CO., LTD., Beijing (CN)
Filed by BEIJING SUMMER SPROUT TECHNOLOGY CO., LTD., Beijing (CN)
Filed on Jan. 28, 2022, as Appl. No. 17/649,261.
Claims priority of application No. 202110131806.4 (CN), filed on Jan. 30, 2021.
Prior Publication US 2022/0336768 A1, Oct. 20, 2022
Int. Cl. H01L 51/50 (2006.01); C07D 498/04 (2006.01); H10K 50/11 (2023.01); H10K 50/15 (2023.01); H10K 50/17 (2023.01); H10K 85/60 (2023.01); H10K 59/80 (2023.01); H10K 101/40 (2023.01)
CPC C07D 498/04 (2013.01) [H10K 50/11 (2023.02); H10K 50/156 (2023.02); H10K 50/17 (2023.02); H10K 85/622 (2023.02); H10K 85/631 (2023.02); H10K 85/653 (2023.02); H10K 85/6572 (2023.02); H10K 85/6574 (2023.02); H10K 59/80 (2023.02); H10K 2101/40 (2023.02)] 24 Claims
OG exemplary drawing
 
1. An organic electroluminescent device, comprising:
a first electrode,
a second electrode, and
at least two light-emitting units disposed between the first electrode and the second electrode, wherein each light-emitting unit comprises at least one emissive layer;
wherein at least one light-emitting unit comprises a first organic layer comprising a first organic material and a second organic material;
wherein a charge generation layer is disposed between at least one group of adjacent two light-emitting units, and the charge generation layer comprises a buffer layer, wherein the buffer layer comprises a third organic material;
wherein the lowest unoccupied molecular orbital (LUMO) energy level of the first organic material is greater than or equal to the LUMO energy level of the third organic material, and the LUMO energy level of the third organic material is greater than 4.90 eV;
wherein the highest occupied molecular orbital (HOMO) energy level of the second organic material is greater than 4.99 eV.