公开(公告)号：US20230345752A1

公开(公告)日：2023-10-26

申请号：US17635705

申请日：2021-04-16

Applicant: BOE Technology Group Co., Ltd.

Inventor： Xiaojin ZHANG ,  Huiyun YANG ,  Yong WU ,  Dan WANG

IPC: H10K50/12

CPC classification number: H10K50/121 ,  H10K2102/351

Abstract: The embodiments of the disclosure provide an organic electroluminescent device, including an anode, a cathode, an emitting layer arranged between the anode and the cathode, and an assistant luminescent layer located on one side, facing the anode, of the emitting layer. The assistant luminescent layer includes a first host material and a first fluorescent guest material. The emitting layer includes a second host material, a TADF material, and a second fluorescent guest material. The first host material and the first fluorescent guest material satisfy: S1(B)−T1(B)>0.2 eV; S1(B)>S1(C); T1(B)>T1(C); ∥HOMO(B)−LUMO(C)|−S1(C)|≤0.2 eV. The lowest singlet state energy of the first host material is S1(B), and the lowest triplet state energy is T1(B). The lowest singlet state energy of the first fluorescent guest material is S1(C), and the lowest triplet state energy is T1(C).

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：US20240188318A1

公开(公告)日：2024-06-06

申请号：US17600278

申请日：2020-11-30

Applicant: BOE Technology Group Co., Ltd.

Inventor： Xiaojin ZHANG ,  Huiyun YANG ,  Changho LEE

IPC: H10K50/12 ,  H10K101/20 ,  H10K101/30

CPC classification number: H10K50/121 ,  H10K2101/20 ,  H10K2101/30

Abstract: The disclosure relates to an organic light emitting diode, a method for manufacturing the same, and a display panel. The organic light emitting diode includes: a first electrode; a second electrode disposed opposite to the first electrode; a light-emitting layer between the first electrode and the second electrode; the light-emitting layer includes a first light-emitting sub-layer and a second light-emitting sub-layer; the first light-emitting sub-layer includes a host material, a TADF sensitizer and a fluorescent guest material; the second light-emitting sub-layer includes the host material or includes the host material and the TADF sensitizer. The light-emitting layer of the organic light emitting diode of the present disclosure includes the first light-emitting sub-laver and the second light-emitting sub-layer, and thus the luminous efficiency of the red light-emitting device, the green light-emitting device, and the blue light-emitting device can be harmonized by effectively adjusting a thickness of the second light-emitting sub-layer.

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：US20220131101A1

公开(公告)日：2022-04-28

申请号：US17509788

申请日：2021-10-25

Applicant: Chengdu BOE Optoelectronics Technology Co., Ltd. ,  BOE Technology Group Co., Ltd.

Inventor： Huiyun YANG ,  Xiaojin ZHANG ,  Haiyan SUN

IPC: H01L51/50 ,  H01L51/56

Abstract: Provided is an organic light emitting device, including a p-type host layer, an n-type host layer, and an interlayer disposed between the p-type host layer and the n-type host layer, wherein at least one of the p-type host layer and the n-type host layer includes a fluorescent dopant, and a preset distance is present between the fluorescent dopant and the interlayer; the p-type host layer and the n-type host layer are configured to form, together with the interlayer, a spatially separated exciplex under an action of driving voltage; and the fluorescent dopant is configured to absorb energy of singlet excitons generated by the exciplex to emit light.