公开(公告)号：US12048173B2

公开(公告)日：2024-07-23

申请号：US17344864

申请日：2021-06-10

Applicant: BOE Technology Group Co., Ltd.

Inventor： Rongrong Gao ,  Dongxu Zhang ,  Yuqian Sun

IPC: H01L51/50 ,  H10K50/11 ,  H10K50/15 ,  H10K50/16 ,  H10K50/17 ,  H10K59/35 ,  H10K85/60 ,  H10K101/10 ,  H10K101/40

CPC classification number: H10K50/11 ,  H10K50/15 ,  H10K50/16 ,  H10K50/171 ,  H10K59/353 ,  H10K85/654 ,  H10K85/6572 ,  H10K2101/10 ,  H10K2101/40

Abstract: A light emitting device and a displaying device. The light emitting device includes a luminescent layer, wherein the luminescent layer includes a thermally activated delayed-fluorescence material; the thermally activated delayed-fluorescence material includes a donor group, a receptor group and a linking group; the donor group and the receptor group bond to the linking group; and a torsion angle between a plane where the donor group is located and a plane where the linking group is located is θ1, and a torsion angle between a plane where the receptor group is located and the plane where the linking group is located is θ2; wherein θ1 and θ2 enable an energy-level difference between a singlet-state energy level of the thermally activated delayed-fluorescence material and a triplet-state energy level of the thermally activated delayed-fluorescence material to be less than a constant quantity T, wherein 0 eV

公开(公告)号：US20240306496A1

公开(公告)日：2024-09-12

申请号：US18026932

申请日：2022-04-22

Applicant: BOE Technology Group Co., Ltd.

Inventor： Yang Liu ,  Lixia Qiu ,  Yuqian Sun

IPC: H10K85/60 ,  H10K50/11 ,  H10K101/00 ,  H10K101/30

CPC classification number: H10K85/6572 ,  H10K85/615 ,  H10K85/654 ,  H10K85/657 ,  H10K85/6574 ,  H10K50/11 ,  H10K2101/30 ,  H10K2101/90

Abstract: The present disclosure provides a luminescent layer, a light emitting device and a display apparatus. The luminescent layer includes: a host material including a hole-type host material and an electron-type host material, wherein by the effect of an external energy, the host material is configured to be capable of forming an exciplex; and a guest material being doped in the host material; wherein an absolute value of a difference between an energy value of a highest occupied molecular orbital HOMO of the hole-type host material and an energy value of a lowest unoccupied molecular orbital LUMO of the electron-type host material satisfies: 2.4 eV≤|HOMO-LUMO|≤3.2 eV. The luminescent layer according to the present disclosure, by using the energy-level configuration between the hole-type host material and the electron-type host material, can reduce the density of the triplet-state excitons, weaken TTA effect, and increase brightening voltage, thereby effectively ameliorating the interference between the pixels.