US 11,930,651 B2
Organic luminescent material, organic electroluminescent element and display device
Xinghua Liu, Beijing (CN); Xiaojin Zhang, Beijing (CN); and Haiyan Sun, Beijing (CN)
Assigned to BOE Technology Group Co., Ltd., Beijing (CN)
Filed by BOE Technology Group Co., Ltd., Beijing (CN)
Filed on Jun. 10, 2021, as Appl. No. 17/344,809.
Claims priority of application No. 202010530024.3 (CN), filed on Jun. 11, 2020.
Prior Publication US 2021/0391552 A1, Dec. 16, 2021
Int. Cl. H10K 50/11 (2023.01); H10K 50/18 (2023.01); H10K 101/40 (2023.01); H10K 101/10 (2023.01); H10K 101/30 (2023.01)
CPC H10K 50/11 (2023.02) [H10K 50/18 (2023.02); H10K 2101/10 (2023.02); H10K 2101/30 (2023.02); H10K 2101/40 (2023.02)] 20 Claims
OG exemplary drawing
 
1. An organic luminescent material, comprising: a host material, a thermally activated delayed fluorescence (TADF) sensitizer, and a fluorescent luminescent material; wherein
an absolute value of a difference between an LUMO energy level of the host material and an LUMO energy level of the TADF sensitizer is less than or equal to 0.4 eV, and an absolute value of a difference between a HOMO energy level of the host material and a HOMO energy level of the TADF sensitizer is less than or equal to 0.4 eV;
at least one of the following is satisfied:
an absolute value of an LUMO energy level of the fluorescent luminescent material is less than or equal to an absolute value of the LUMO energy level of the host material, and the absolute value of the LUMO energy level of the fluorescent luminescent material is less than or equal to an absolute value of the LUMO energy level of the TADF sensitizer; or
an absolute value of a HOMO energy level of the fluorescent luminescent material is greater than or equal to an absolute value of the HOMO energy level of the host material and the absolute value of the HOMO energy level of the fluorescent luminescent material is greater than or equal to an absolute value of the HOMO energy level of the TADF sensitizer; and
an emission spectrum of the host material overlaps an absorption spectrum of the TADF sensitizer, and an emission spectrum of the TADF sensitizer overlaps an absorption spectrum of the fluorescent luminescent material.