Chiral TADF‐Active Polymers for High‐Efficiency Circularly Polarized Organic Light‐Emitting Diodes. (29th September 2021)

• Record Type: Journal Article
• Authors: Wang, Yin‐Feng; Li, Meng; Teng, Jin‐Ming; Zhou, He‐Ye; Zhao, Wen‐Long; Chen, Chuan‐Feng
• Is Part Of: Angewandte Chemie. Volume 133:Number 44(2021)
• Page Start: 23811
• Page End: 23816
• Publication Date: 2021-09-29
• Subjects: chiral nonconjugated polymer -- circularly polarized electroluminescence -- organic light-emitting diodes -- thermally activated delayed fluorescence -- triptycene scaffold; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.202110794
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: A strategy of chiral donor–acceptor copolymerization is proposed to develop chiral nonconjugated polymers with thermally activated delayed fluorescence (TADF). Based on this strategy, two pairs of chiral polymers ( R, R )‐/( S, S )‐pTpAcDPS and ( R, R )‐/( S, S )‐pTpAcBP were synthesized. The alternating copolymerization of the chiral donors and acceptors could effectively separate the frontier molecular orbitals, which made the polymers show small Δ E ST of 0.01–0.03 eV and efficient TADF properties. Moreover, the polymers also showed the quantum yield of up to 92 % and the circularly polarized luminescence. The solution‐processed circularly polarized organic light‐emitting diodes showed circularly polarized electroluminescence signals with high external quantum efficiencies of up to 22.1 % and maximum luminance of up to 34350 cd m −2 . This is the first report of CP‐OLEDs based on chiral TADF polymer, which provides a useful and valuable guidance for the development of high‐efficiency CPEL polymers. Abstract : Based on a chiral donor–acceptor copolymerization strategy, two pairs of chiral nonconjugated TADF polymers with low Δ E ST values and high PLQYs were constructed. The corresponding solution‐processed CP‐OLEDs exhibited intense CPEL signals and high device efficiencies with an EQEmax of up to 22.1 %.