US 11,737,297 B2
Organic electroluminescent device
Liang Gao, Beijing (CN); Huiqing Pang, Beijing (CN); Menglan Xie, Beijing (CN); Chuanjun Xia, Beijing (CN); and Chi Yuen Raymond Kwong, Beijing (CN)
Assigned to BEIJING SUMMER SPROUT TECHNOLOGY CO., LTD., Beijing (CN)
Filed by BEIJING SUMMER SPROUT TECHNOLOGY CO., LTD., Beijing (CN)
Filed on Oct. 15, 2020, as Appl. No. 17/71,556.
Claims priority of application No. 201910987157.0 (CN), filed on Oct. 17, 2019.
Prior Publication US 2021/0119162 A1, Apr. 22, 2021
Int. Cl. H10K 50/13 (2023.01); H10K 50/11 (2023.01); H10K 71/10 (2023.01); H10K 71/30 (2023.01); H10K 85/60 (2023.01); H10K 101/40 (2023.01); H10K 101/30 (2023.01); H10K 102/00 (2023.01)
CPC H10K 50/13 (2023.02) [H10K 50/11 (2023.02); H10K 71/10 (2023.02); H10K 71/30 (2023.02); H10K 85/653 (2023.02); H10K 85/654 (2023.02); H10K 85/655 (2023.02); H10K 85/6574 (2023.02); H10K 2101/30 (2023.02); H10K 2101/40 (2023.02); H10K 2102/302 (2023.02)] 20 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 the light emitting units each comprises at least one light emitting layer;
wherein a connection layer consisting of a metal layer and a buffer layer is further disposed between at least one set of adjacent two light emitting units, wherein the material of the buffer layer is an organic material; and
wherein the light emitting unit in contact with the buffer layer further comprises a hole injection layer, and the hole injection layer of the light emitting unit in contact with the buffer layer comprises the material of the buffer layer.
 
10. 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 the light emitting units each comprises at least one light emitting layer;
wherein a connection layer consisting of a metal layer and a buffer layer is further disposed between at least one set of adjacent two light emitting units;
wherein a material of the buffer layer is an organic material, and the organic material has a lowest unoccupied molecular orbital (LUMO) energy level of greater than 4.9 eV.