US 12,232,343 B2
Organic light emitting device, preparation method therefor, and display apparatus
Zhihui Zhang, Beijing (CN); Yan Fan, Beijing (CN); Xing Fan, Beijing (CN); Shu Jing, Beijing (CN); Huameng Liu, Beijing (CN); and Kuo Shen, Beijing (CN)
Assigned to BOE Technology Group Co., Ltd., Beijing (CN)
Appl. No. 17/638,195
Filed by BOE Technology Group Co., Ltd., Beijing (CN)
PCT Filed Apr. 26, 2021, PCT No. PCT/CN2021/089833
§ 371(c)(1), (2) Date Feb. 25, 2022,
PCT Pub. No. WO2022/226718, PCT Pub. Date Nov. 3, 2022.
Prior Publication US 2024/0057363 A1, Feb. 15, 2024
Int. Cl. H01L 51/50 (2006.01); H10K 50/11 (2023.01); H10K 50/16 (2023.01); H10K 50/858 (2023.01); H10K 71/12 (2023.01); H10K 101/00 (2023.01); H10K 102/00 (2023.01)
CPC H10K 50/11 (2023.02) [H10K 50/16 (2023.02); H10K 50/858 (2023.02); H10K 71/12 (2023.02); H10K 2101/90 (2023.02); H10K 2102/351 (2023.02)] 18 Claims
OG exemplary drawing
 
1. An organic light emitting device, comprising an anode, a cathode, and a light emitting layer and an electron transport layer arranged between the anode and the cathode, wherein the electron transport layer is arranged between the light emitting layer and the cathode; the electron transport layer comprises a first host material and a second host material; and a mixing ratio of the first host material to the second host material of one side of the electron transport layer close to the light emitting layer is different from a mixing ratio of the first host material to the second host material of one side of the electron transport layer away from the light emitting layer; and
wherein a refractive index of the first host material is greater than a refractive index of the second host material.