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Thermally activated delayed fluorescence enantiomers for solution-processed circularly polarized electroluminescence

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Abstract

Circularly polarized organic light-emitting diodes (CP-OLEDs) with thermally activated delayed fluorescence (TADF) characteristics are receiving increasing interest, as they have shown improving efficiencies of circularly polarized electroluminescence (CPEL). Here, we developed a series of TADF enantiomers based on chiral binaphthalene, an acceptor (A) of cyanopyridine, and donors (D) of carbazoles in a chiral–A–D architecture. Good solubility, high luminescence yields, and excellent chiral stability with a photoluminescence dissymmetry factor (gPL) up to 5.8 × 10−4 were achieved. Efficient CP-OLEDs using these chiral TADF molecules as dopants were successfully fabricated, exhibiting high external quantum efficiencies (EQEs) up to 12.4% and opposite CPEL signals with gEL of 6 × 10−4/−8.6 × 10−4 in vacuum-deposited devices. More impressively, the solution-processed TADF CP-OLEDs result in much larger gEL values (3.5 × 10−3/−3.9 × 10−3) with EQEs up to 10.6%. This discovery is encouraging and instructive, which could stimulate the development of high-performance CP-OLEDs using chiral TADF molecules through solution-processing approaches.

Graphical abstract: Thermally activated delayed fluorescence enantiomers for solution-processed circularly polarized electroluminescence

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Publication details

The article was received on 07 Sep 2019, accepted on 02 Oct 2019 and first published on 03 Oct 2019


Article type: Paper
DOI: 10.1039/C9TC04941J
J. Mater. Chem. C, 2019, Advance Article

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    Thermally activated delayed fluorescence enantiomers for solution-processed circularly polarized electroluminescence

    S. Sun, J. Wang, L. Chen, R. Chen, J. Jin, C. Chen, S. Chen, G. Xie, C. Zheng and W. Huang, J. Mater. Chem. C, 2019, Advance Article , DOI: 10.1039/C9TC04941J

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