Calixresorcinarene-based Hyper-Structured Molecular Thermally Activated Delayed Fluorescence Yellow-Green Emitters for Non-doped OLEDs
A novel hyper-structured molecular (HSM) thermally activated delayed fluorescent (TADF) emitters, in which the TADF units and host units are bound together into one inactive core through the flexible linkage, was designed. Phenoxazine-triphenyltriazine (PXZ-Trz), 1,3-bis(9H-carbazol-9-yl)benzene (mCP) and calixresorcinarene (CRA) were chosed as TADF unit, host unit and core, respectively, a series of CRA-based HSM emitter, CRA-PXZ-Trz(X)-mCP(100-X). (x=0, 12.5, 25, 50, 75, 87.5 or 100) were succesfully synthesized by a two-step click reaction. Using non-doped CRA-PXZ-Trz(87.5)-mCP(12.5) as the light-emitting layer, the solotion-precessable OLEDs emitted yellow-green light, and dispiayed a external quantum efficiency of 16.7% at 100 cd/m2.