Issue 36, 2021

Circularly polarized electroluminescence from an achiral fluorophore induced by co-assembly with chiral polymers

Abstract

Recently, much attention has been paid to circularly polarized luminescence (CPL) organic light-emitting diodes (CP-OLEDs) from achiral fluorophores through an intermolecular chirality induction mechanism. In this paper, we developed a new strategy for CP-OLEDs of achiral fluorophores induced by helical co-assembly between chiral polymers and an achiral fluorophore. In this paper, we synthesized three chiral 1,1′-binaphthyl-based polymers (R/S-P1, R/S-P2 and R/S-P3) with different side chain alkyl groups (n-C4H9; n-C6H13; n-C8H17), which can act as chirality inducers and form chiral co-assemblies with an achiral pyrenyl fluorophore (Bpy). At a 50% doping weight ratio of R/S-P2 inducer with Bpy, this kind of chiral co-assembly (R/S-P2-Bpy) can exhibit helical nano fibers and emit a strong deep blue CPL signal (λem = 420 nm, dissymmetry factor |gem| = 0.042) in spin-coated films after annealing (120 °C). Moreover, the stable CP-OLEDs using R/S-P2-Bpy as the device emitting layer (EML) can emit strong CP-EL with an electroluminescence dissymmetry factor |gEL| of up to 0.021.

Graphical abstract: Circularly polarized electroluminescence from an achiral fluorophore induced by co-assembly with chiral polymers

Supplementary files

Article information

Article type
Paper
Submitted
27 Apr 2021
Accepted
28 Jul 2021
First published
30 Jul 2021

J. Mater. Chem. C, 2021,9, 12141-12147

Circularly polarized electroluminescence from an achiral fluorophore induced by co-assembly with chiral polymers

Z. Geng, Y. Zhang, Y. Zhang, Y. Li, Y. Quan and Y. Cheng, J. Mater. Chem. C, 2021, 9, 12141 DOI: 10.1039/D1TC01948A

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