Issue 25, 2022

Enhancing hole carrier injection via low electrochemical doping on circularly polarized polymer light-emitting diodes

Abstract

Circularly polarized electroluminescence (CP-EL) from a blend system of chiral small-molecule additives and device optimised achiral π-conjugated polymers (π-CPs) is of great interest for next-generation display technologies. However, CP polymer light-emitting diodes can suffer from unbalanced charge transport and unfavorable energetics between chiral additives and achiral polymers, which can limit the efficiency of charge injection and device performance. Herein, we demonstrate the use of a small amount of chemcially modified electrochemical doping agent (EDA, 1.5 wt%) to control such limitations. The EDA with a long cationic alkyl chain enables strong hydrophobicity and stable electrochemical doping of achiral π-CP F8BT in F8BT:aza[6]H blends, which allows for better charge injection and balance. This leads to improved device performance while maintaining highly dissymmetric electroluminescence (gEL ∼ 0.50@580 nm) and an inverted dissymmetry factor (gEL = −0.65@525 nm). These findings indicate that EDAs may provide a simple approach to improve the performance of CP optoelectronic devices.

Graphical abstract: Enhancing hole carrier injection via low electrochemical doping on circularly polarized polymer light-emitting diodes

Supplementary files

Article information

Article type
Paper
Submitted
12 3 2022
Accepted
01 6 2022
First published
01 6 2022
This article is Open Access
Creative Commons BY license

J. Mater. Chem. C, 2022,10, 9512-9520

Enhancing hole carrier injection via low electrochemical doping on circularly polarized polymer light-emitting diodes

H. Yan, J. Wade, L. Wan, S. Kwon, M. J. Fuchter, A. J. Campbell and J. Kim, J. Mater. Chem. C, 2022, 10, 9512 DOI: 10.1039/D2TC01010K

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