Journal
ADVANCED OPTICAL MATERIALS
Volume -, Issue -, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202300550
Keywords
chiral donor; circularly polarized electroluminescence; circularly polarized polymer light-emitting diodes; deep-red; thermally activated delayed fluorescence
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Circularly polarized electroluminescence (CPEL) from thermally activated delayed fluorescence (TADF) emitters has been extensively studied. In this study, a universal strategy for designing deep-red chiral TADF emitters is explored using a pair of chiral donor intermediates. Chiral TADF polymers R-P and S-P are developed through this strategy, exhibiting intense mirror-image circularly polarized luminescence (CPL) signals. Furthermore, solution-processed circularly polarized polymer light-emitting diode (CP-PLED) devices fabricated with R-P and S-P show persuasive performance with high external quantum efficiencies (EQEs) and detectable mirror-image CPEL signals with electroluminescence dissymmetry factors (gEL).
Circularly polarized electroluminescence (CPEL) from thermally activated delayed fluorescence (TADF) emitters have been widely reported in recent years. However, a universal strategy for designing deep-red chiral TADF emitters is still unexplored. Herein, to address the problem, a pair of chiral donor intermediates are designed and synthesized for preparing deep-red chiral TADF emitters, and two novel chiral TADF polymers R-P and S-P are developed through this strategy. The polymers exhibit intense mirror-image circularly polarized luminescence (CPL) signals in toluene dilute solution. Besides, a series of solution-processed circularly polarized polymer light-emitting diode (CP-PLED) devices are fabricated with R-P and S-P. The corresponding devices achieve persuasive performance with external quantum efficiencies (EQEs) of 6.2% and 5.8% at the wavelength of 662 nm, respectively. Besides, mirror-image CPEL signals are detected with electroluminescence dissymmetry factors (gEL) of +1.6 x 10(-3) and -1.7 x 10(-3) from the corresponding CP-PLED devices, respectively.
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