公开(公告)号：US20220328782A1

公开(公告)日：2022-10-13

申请号：US17614745

申请日：2020-10-15

Applicant: BOE TECHNOLOGY GROUP CO., LTD.

Inventor： Xiaojin ZHANG ,  Xinghua LIU ,  Huiyun YANG ,  Changho LEE

IPC: H01L51/50 ,  H01L51/56 ,  H01L51/00

Abstract: A light-emitting device includes a first light-emitting layer and a second light-emitting layer that are stacked. A material of the first light-emitting layer includes a first host material and a first TADF sensitizer. A material of the second light-emitting layer includes a second host material, a second TADF sensitizer, and a second fluorescent emissive material. Transmission rates of the material of the first light-emitting layer and the material of the second light-emitting layer to holes are greater than transmission rates of the material of the first light-emitting layer and the material of the second light-emitting layer to electrons, and there is a first overlapping region between a normalized electroluminescence spectrum of the first TADF sensitizer and a normalized absorption spectrum of the second fluorescent emissive material.

公开(公告)号：US20210391552A1

公开(公告)日：2021-12-16

申请号：US17344809

申请日：2021-06-10

Applicant: BOE Technology Group Co., Ltd.

Inventor： Xinghua LIU ,  Xiaojin ZHANG ,  Haiyan SUN

IPC: H01L51/50

Abstract: Organic luminescent material, includes: host material, TADF sensitizer, and fluorescent-luminescent material; wherein absolute value of difference between LUMO level of the host material and LUMO level of the TADF sensitizer is not more than 0.4 eV, and absolute-value of difference between HOMO level of the host material and HOMO level of the TADF sensitizer is not more than 0.4 eV; absolute-value of LUMO level of the fluorescent-luminescent material is not more than absolute-value of the LUMO level of the host material and the LUMO level of the TADF sensitizer, and/or absolute-value of HOMO level of the fluorescent-luminescent material is not less than an absolute-value of the HOMO level of the host material and absolute-value of the HOMO level of the TADF sensitizer; and emission-spectrum of the host material overlaps an absorption-spectrum of the TADF sensitizer, and emission-spectrum of the TADF sensitizer overlaps absorption-spectrum of the fluorescent-luminescent material.

公开(公告)号：US20220416190A1

公开(公告)日：2022-12-29

申请号：US17765005

申请日：2021-05-13

Applicant: BOE TECHNOLOGY GROUP CO., LTD.

Inventor： Xiaojin ZHANG ,  Xinghua LIU ,  Huiyun YANG ,  Dan WANG

IPC: H01L51/50 ,  H01L51/56

Abstract: An organic light-emitting device and a preparation method therefor, a display panel, and a display device. The organic light-emitting device comprises an anode layer, a cathode layer, and a first light-emitting layer and an auxiliary light-emitting layer disposed between the anode layer and the cathode layer; the auxiliary light-emitting layer is located between the first light-emitting layer and the cathode layer; the first light-emitting layer comprises a first host material, a first thermally activated delayed fluorescence material, and a first fluorescence guest material; the auxiliary light-emitting layer comprises at least a second host material and a second thermally activated delayed fluorescence material. The first light-emitting layer is a super-fluorescence system, and the auxiliary light-emitting layer also forms a super-fluorescence system together with the first fluorescence guest material.

公开(公告)号：US20230413666A1

公开(公告)日：2023-12-21

申请号：US18249997

申请日：2020-12-08

Applicant: BOE Technology Group Co., Ltd.

Inventor： Rongrong GAO ,  Xinghua LIU ,  Dongxu ZHANG

IPC: H10K85/60 ,  H10K71/16 ,  H10K85/40

CPC classification number: H10K85/654 ,  H10K71/16 ,  H10K85/6574 ,  H10K85/615 ,  H10K85/624 ,  H10K85/40 ,  H10K85/6576 ,  H10K85/657 ,  H10K50/16

Abstract: Embodiments of the present invention provide an OLED device and a manufacturing method. The OLED device comprises: an anode; a hole transport layer; a light-emitting layer; an electron transport layer comprising a first electron transport body and a second electron transport body, wherein the first electron transport body has a spiral structure, the second electron transport body has a continuous π conjugated system formed by fusing a dioxin structure and a benzoheterocyclic structure, the electron mobility of the first electron transport body is less than the electron mobility of the second electron transport body, the electron mobility of the second electron transport body is 10−5-10−8 cm2V−1s−1@5000 V1/2/m1/2, the triplet-state energy level of the first electron transport body is greater than the triplet-state energy level of the second electron transport body, and the triplet-state energy level of the first electron transport body is greater than 2.4 eV; and a cathode.

公开(公告)号：US20230380278A1

公开(公告)日：2023-11-23

申请号：US18027500

申请日：2021-01-06

Applicant: BOE Technology Group Co., Ltd.

Inventor： Xinghua LIU ,  Xiaojin ZHANG ,  Haiyan SUN ,  Yong WU

IPC: H10K85/60 ,  H10K50/15

CPC classification number: H10K85/6572 ,  H10K85/631 ,  H10K85/654 ,  H10K50/15 ,  H10K50/181

Abstract: Provided is a light-emitting diode. The light-emitting diode includes: an anode; a hole transport layer, disposed on a side of the anode and containing a hole transport material, wherein the hole transport material includes an organic small molecule material with a molecular weight less than 4000, and a hole mobility of the hole transport material is not less than 1×E−5 cm2/(VS); a light-emitting layer, disposed on a side, distal from the anode, of the hole transport layer, and containing a quantum dot material; an electron buffer layer, disposed on a side, distal from the hole transport layer, of the light-emitting layer, and containing a thermally activated delayed fluorescent material; and a cathode, disposed on a side, distal from the light-emitting layer, of the electron buffer layer.

公开(公告)号：US20230301172A1

公开(公告)日：2023-09-21

申请号：US18021548

申请日：2022-03-03

Applicant: BOE Technology Group Co., Ltd.

Inventor： Xinghua LIU ,  Xiaojin ZHANG ,  Haiyan SUN

IPC: H10K85/40 ,  H10K85/60 ,  C09K11/02 ,  C09K11/06 ,  H10K50/15 ,  H10K50/18 ,  H10K50/17

CPC classification number: H10K85/40 ,  H10K85/654 ,  H10K85/6572 ,  H10K85/633 ,  H10K85/658 ,  C09K11/02 ,  C09K11/06 ,  H10K85/615 ,  H10K85/6574 ,  H10K50/157 ,  H10K50/181 ,  H10K50/171 ,  H10K2101/20

Abstract: Provided in the present disclosure are a thermally activated delayed fluorescent material, an organic light-emitting device and a display apparatus. The energy level difference between a singlet energy level and a triplet energy level of the thermally activated delayed fluorescent material is less than 0.3 eV, and a spin-orbit coupling value SOC between a singlet state and a triplet state of the thermally activated delayed fluorescent material is SOC≤0.05 cm−1.

公开(公告)号：US20220271252A1

公开(公告)日：2022-08-25

申请号：US17532502

申请日：2021-11-22

Applicant: BOE Technology Group Co., Ltd.

Inventor： Xinghua LIU ,  Xiaojin ZHANG ,  Haiyan SUN

IPC: H01L51/50 ,  H01L51/00 ,  H01L51/56

Abstract: The present disclosure relates to an organic light emitting device, a display device, a preparation method, a storage medium and a computer equipment. The organic light emitting device includes an anode, an organic layer and a cathode, in which the organic layer includes a hole injection layer, a hole transport layer, an electron blocking layer, an organic light emitting layer, a hole blocking layer, an electron transport layer, and an electron injection layer, which are sequentially arranged in a stack on the anode, in which the hole injection layer includes a first host material and a first doping material doped in the first host material, a doping concentration of the first doping material gradually decreases in a direction away from the anode, and a doping ratio of the first doping material in the hole injection layer is less than or equal to 6%.