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. 2018 Mar 5;57(11):2889-2893.
doi: 10.1002/anie.201800198. Epub 2018 Feb 8.

Stable Enantiomers Displaying Thermally Activated Delayed Fluorescence: Efficient OLEDs with Circularly Polarized Electroluminescence

Meng Li  1   2 , Si-Hua Li  3 , Dongdong Zhang  4 , Minghan Cai  4 , Lian Duan  4 , Man-Keung Fung  3 , Chuan-Feng Chen  1   2
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Stable Enantiomers Displaying Thermally Activated Delayed Fluorescence: Efficient OLEDs with Circularly Polarized Electroluminescence

Meng Li et al. Angew Chem Int Ed Engl. .

Abstract

Aromatic-imide-based thermally activated delayed fluorescent (TADF) enantiomers, (+)-(S,S)-CAI-Cz and (-)-(R,R)-CAI-Cz, were efficiently synthesized by introducing a chiral 1,2-diaminocyclohexane to the achiral TADF unit. The TADF enantiomers exhibited high PLQYs of up to 98 %, small ΔEST values of 0.06 eV, as well as obvious temperature-dependent transient PL spectra, thus demonstrating their excellent TADF properties. Moreover, the TADF enantiomers showed mirror-image CD and CPL activities. Notably, the CP-OLEDs with CPEL properties based on the TADF enantiomers not only achieved high EQE values of up to 19.7 and 19.8 %, but also displayed opposite CPEL signals with gEL values of -1.7×10-3 and 2.3×10-3 , which represents the first CP-OLEDs, based on the enantiomerically pure TADF materials, having both high efficiencies and intense CPEL.

Keywords: OLED; chirality; enantiomers; fluorescence; luminescence.

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