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High brightness circularly polarized electroluminescence from conjugated polymer F8BT induced by chiral binaphthyl-pyrene

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Abstract

Chiral organic polymers have considerable potential in solution-processable circularly polarized organic light emitting diodes (CP-OLEDs) due to their simple, low cost and large-area processing. Achiral conjugated poly[(9,9-di-n-octylfluorenyl-2,7-diyl)-alt-(benzo[2,1,3]-thiadiazol-4,8-diyl)] (F8BT) is a donor–acceptor copolymer with superior characteristics including its ability to uniformly disperse chiral dopants and form homogeneous and smooth films. This paper describes the design and development of blue-emission chiral enantiomers R-/S-3 bearing pyrene groups as fluorophores and 2,2′-methylenedioxy-1,1′-binaphthalene moieties as chiral sources. Enantiomers R-/S-3 exhibit high thermal properties, outstanding photoluminescence properties and sufficient solubility in common organic reagents. The CP-OLEDs using R-/S-3 as the blue emission emitting layer show excellent efficiency, high brightness, and low turn-on voltage in non-doped OLEDs. Moreover, we further employed achiral conjugated fluorescent polymer F8BT, blended with blue-emitting chiral dopants (R-/S-3), as the device emitting layer. The CP-OLEDs based on blends of F8BT + 10% R-/S-3 showed low turn-on voltage (Von = 4.1 V), excellent current efficiencies (4.19 cd A−1 for F8BT + 10% R-3 and 4.06 cd A−1 for F8BT + 10% S-3), and high brightness (21797.8 cd m−2 for F8BT + 10% R-3 and 20572.6 cd m−2 for F8BT + 10% S-3). To our knowledge, this is, to date, the best device performance using blends of achiral fluorescent polymers and chiral inducers in solution-processable CP-PLEDs. The outcomes obtained in this study can provide us with a valuable reference for future studies on the induced CPL-active device design.

Graphical abstract: High brightness circularly polarized electroluminescence from conjugated polymer F8BT induced by chiral binaphthyl-pyrene

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Supplementary files

Article information


Submitted
25 Aug 2020
Accepted
20 Sep 2020
First published
21 Sep 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

High brightness circularly polarized electroluminescence from conjugated polymer F8BT induced by chiral binaphthyl-pyrene

X. Zhang, Z. Xu, Y. Zhang, Y. Quan and Y. Cheng, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/D0TC04039H

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