Patent ID: 11930651
Assignee: BOE TECHNOLOGY GROUP CO., LTD.
Field: nan (nan)
Classification: CPC H | IPC H

Claim 8:
9. An organic electroluminescence element, comprising: an anode, a cathode, and an organic light-emitting layer disposed between the anode and the cathode, and material of the organic light-emitting layer includes a host material, a 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.