US 12,035,554 B2
Organic electroluminescent device and manufacturing method thereof
Xiangmin Wen, Beijing (CN); Xing Fan, Beijing (CN); Yan Fan, Beijing (CN); and Hao Gao, Beijing (CN)
Assigned to BOE TECHNOLOGY GROUP CO., LTD., Beijing (CN)
Filed by BOE TECHNOLOGY GROUP CO., LTD., Beijing (CN)
Filed on Sep. 23, 2021, as Appl. No. 17/483,290.
Claims priority of application No. 202110070364.7 (CN), filed on Jan. 19, 2021.
Prior Publication US 2022/0231251 A1, Jul. 21, 2022
Int. Cl. H10K 50/16 (2023.01); H10K 71/16 (2023.01); H10K 85/30 (2023.01); H10K 85/60 (2023.01); H05B 33/22 (2006.01); H10K 50/155 (2023.01); H10K 101/30 (2023.01)
CPC H10K 50/16 (2023.02) [H10K 71/164 (2023.02); H05B 33/22 (2013.01); H10K 50/155 (2023.02); H10K 85/324 (2023.02); H10K 85/6572 (2023.02); H10K 2101/30 (2023.02)] 20 Claims
OG exemplary drawing
 
1. An organic electroluminescent device comprising:
an anode;
an electron transport layer; and
a cathode,
wherein a material of the electron transport layer comprises a mixture of a first electron transport material and a second electron transport material,
wherein a lowest unoccupied molecular orbital energy level of the first electron transport material is higher than that of the second electron transport material;
wherein a ratio of the first electron transport material to the second electron transport material first decreases and then increases in a direction from the cathode to the anode; and
wherein a ratio of the first electron transport material to the second electron transport material at a third interface in the electron transport layer is lowest.