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Axially chiral TADF-active materials with ?-extended acceptors for highly efficient circularly polarized electroluminescence
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AI
K
张
W
M
C
DOI：10.1016/j.cej.2023.142123.png)
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Abstract
En 中文
In this work, a pi-extended acceptor strategy for designing chiral thermally activated delayed fluorescence (TADF)-active materials with highly efficient circularly polarized electroluminescence (CPEL) properties has been proposed. Consequently, three pairs of TADF-active enantiomers based on axially chiral biphenyl skeleton, namely R/S-Ax-CN, R/S-Ax-H, R/S-Ax-OCH3, were designed and constructed. Various para-substituted push-pull electron groups were introduced into the axially chiral skeleton to comprehend the structure-property relationship. Compared with R/S-Ax-H and R/S-Ax-OCH3, R/S-Ax-CN exhibited a higher PLQY of 88.6% and a smaller Delta EST of 0.13 eV, ascribing to the pull electron effect of CN group to make a more delocalized distribution of LUMO orbital and a lesser overlapping of frontier molecular orbitals. Consequently, the CP-OLEDs of R/S-Ax-CN showed a remarkable external quantum efficiency up to 21.0% and 19.7% and intense CPEL signals with the electroluminescent dissymmetry factors (gEL) up to +4.2 x 10-3/-4.4 x 10-3, respectively. This work can provide an efficient and facile way to construct highly efficient CP-OLEDs based on chiral TADF-active emitters by simple molecular engineering of introducing pi-extended acceptor.
Keywords:
Axial chirality
Thermally activated delayed fluorescence
Circularly polarized electroluminescence
?-Extended acceptor
Substituent effect
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13.2
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48.5W
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