公开(公告)号：US11758747B2

公开(公告)日：2023-09-12

申请号：US17412460

申请日：2021-08-26

Applicant: BOE TECHNOLOGY GROUP CO., LTD.

Inventor： Shu Jing ,  Xiaobo Du

IPC: H01L51/50 ,  H10K50/13 ,  H10K50/19 ,  H10K71/00 ,  H10K85/60 ,  H10K101/30 ,  H10K102/00

CPC classification number: H10K50/131 ,  H10K50/19 ,  H10K71/00 ,  H10K85/60 ,  H10K85/626 ,  H10K85/631 ,  H10K85/633 ,  H10K85/6572 ,  H10K2101/30 ,  H10K2102/351 ,  H10K2102/361

Abstract: The present disclosure provides a light emitting device including: a first electrode; a first light emitting layer on a side of the first electrode; an N-type charge generation layer on a side of the first light emitting layer distal to the first electrode; a P-type charge generation layer on a side of the N-type charge generation layer distal to the first light emitting layer; a second light emitting layer on a side of the P-type charge generation layer distal to the N-type charge generation layer; and a second electrode on a side of the second light emitting layer distal to the P-type charge generation layer. The N-type charge generation layer includes a host material which has a lowest unoccupied molecular orbital energy level less than or equal to −2.9 and a glass transition temperature greater than 130° C.

公开(公告)号：US12232343B2

公开(公告)日：2025-02-18

申请号：US17638195

申请日：2021-04-26

Applicant: BOE Technology Group Co., Ltd.

Inventor： Zhihui Zhang ,  Yan Fan ,  Xing Fan ,  Shu Jing ,  Huameng Liu ,  Kuo Shen

IPC: H01L51/50 ,  H10K50/11 ,  H10K50/16 ,  H10K50/858 ,  H10K71/12 ,  H10K101/00 ,  H10K102/00

Abstract: An organic light emitting device, a preparation method therefor, and a display apparatus are provided. The organic light emitting device includes an anode, a cathode, and a light emitting layer and an electron transport layer arranged between the anode and the cathode. The electron transport layer is arranged between the light emitting layer and the cathode. The electron transport layer includes a first host material and a second host material. 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.