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：US20230056639A1

公开(公告)日：2023-02-23

申请号：US17789693

申请日：2021-08-04

Applicant: BOE Technology Group Co., Ltd.

Inventor： Yong WU ,  Xiaojin ZHANG

IPC: H01L51/50

Abstract: The present invention provides an organic electroluminescent device, a display panel, and a display device. An organic electroluminescent device, including: an anode and a cathode, arranged in opposite; a light-emitting layer, between the anode and the cathode; a first auxiliary function layer, between the light-emitting layer and the anode; and a second auxiliary function layer, between the light-emitting layer and the cathode; where the light-emitting layer comprises a first compound, a second compound and a third compound; a Stokes shift between an absorption spectrum of the second compound and an emission spectrum of the second compound is smaller than 70 nm; and a doping mass ratio of the second compound in the light-emitting layer is smaller than 50 wt %.

公开(公告)号：US20230043738A1

公开(公告)日：2023-02-09

申请号：US17787471

申请日：2021-08-04

Applicant: BOE Technology Group Co., Ltd.

Inventor： Yong WU ,  Siqi WANG ,  Rongrong GAO

IPC: H01L51/50

Abstract: The present invention provides an organic electroluminescent device, a display panel, and a display apparatus. A light-emitting layer comprises a first compound, a second compound, a third compound, and a fourth compound; the first compound and the second compound form a first exciplex under optical excitation and electric excitation; excitonic energy compounded by the first exciplex can be transferred to the third compound; then the third compound and the second compound are compounded to form a second exciplex; and excitonic energy compounded by the second exciplex can be transferred to the fourth compound. In the excitonic energy transfer process, triplet excitons improve a reverse intersystem crossing process and are converted into singlet excitons to radiate and emit fluorescence when an exciplex is formed by means of compounding; the singlet excitons are effectively used for Forster energy transfer, and Dexter energy transfer is inhibited, such that energy loss is avoided, the excitonic energy is effectively used, and the device efficiency is improved.

公开(公告)号：US20240224554A1

公开(公告)日：2024-07-04

申请号：US17914337

申请日：2021-10-28

Applicant: BOE TECHNOLOGY GROUP CO., LTD.

Inventor： Yong WU ,  Xiaojin ZHANG ,  Haiyan SUN

IPC: H10K50/11 ,  H10K50/18 ,  H10K85/60 ,  H10K101/10 ,  H10K101/30 ,  H10K102/00

CPC classification number: H10K50/11 ,  H10K50/181 ,  H10K85/6572 ,  H10K85/6574 ,  H10K85/658 ,  H10K2101/10 ,  H10K2101/30 ,  H10K2102/351

Abstract: The present disclosure provides an organic electroluminescent device and a display device, belonging to the field of display technology, which can solve the problem of poor luminescent efficiency and short life of the existing organic electroluminescent devices. The organic electroluminescent device of the present disclosure comprises: a first electrode and a second electrode disposed opposite to each other, and a light-emitting layer located between the first electrode and the second electrode; the light-emitting layer comprising: a first compound, a second compound and a third compound; wherein the first compound satisfies a first general formula; the third compound satisfies a second general formula; and the second compound has a difference between a triplet energy level and a singlet energy level of less than or equal to 0.3 eV.

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：US20230092444A1

公开(公告)日：2023-03-23

申请号：US17789700

申请日：2021-08-04

Applicant: BOE Technology Group Co., Ltd.

Inventor： Yong WU

IPC: H01L51/50 ,  H01L51/00

Abstract: Provided are an organic electroluminescent device, a display panel, and a display apparatus. An exciton layer adjacent to a light-emitting layer is added, and the exciton layer serves as an exciton recombination region and achieves the effect of increasing the density of excitons, where the singlet-state energy level of the exciton layer is higher than the singlet-state energy level of a host material in the light-emitting layer, and an emission spectrum of the exciton layer and an absorption spectrum of the host material in the light-emitting layer have an overlapping area. Moreover, the exciton layer allows triplet-state excitons formed in the exciton layer to form singlet-state excitons via a reverse intersystem crossing process.