Issue 44, 2020

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

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

Supplementary files

Article information

Article type
Paper
Submitted
25 авг. 2020
Accepted
20 септ. 2020
First published
21 септ. 2020

J. Mater. Chem. C, 2020,8, 15669-15676

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, 8, 15669 DOI: 10.1039/D0TC04039H

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements