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Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received May 21, 2024
Accepted December 16, 2024
Available online February 25, 2025

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Bluish-Green Light-Emitting Polymers Based on Polycarbazole Containing Benzo[ b ]naphtho[1,2- d ]thiophene- S,S -dioxide Unit

Yuhao Zhang Jin Xu¹ Wei Yang²

Chemical Pollution Control Chongqing Applied Technology Extension, Center of Higher Vocational Colleges , Chongqing Industry Polytechnic College , Chongqing 401120 , China ¹School of Mechanical Engineering , Dongguan University of Technology , Dongguan 523808 , China ²Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Light-Emitting Materials and Devices , South China University of Technology , Guangzhou 510640 , China

Korean Journal of Chemical Engineering, February 2025, 42(2), 445-454(10)
https://doi.org/10.1007/s11814-024-00361-5

Abstract

Bluish-green light-emitting polymers (PCz-NSOs) were prepared through incorporating benzo[ b ]naphtho[1,2- d ]thiophene-

S,S -dioxide (NSO) into the main chain of polycarbazole (PCz). PCz-NSOs exhibited exceptional thermal properties with

decomposition temperatures ( T d s) of PCz-NSOs surpassed 430 °C. With the NSO content increases, the highest occupied

molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels of PCz-NSOs gradually

decreased, and the LUMO energy levels decreased more signifi cantly, which indicated that the NSO unit possessed strong

electronegativity. The combine of NSO and carbazole unit formed robust donor–acceptor (D–A) interaction, which caused

the bathochromic-shift of emission spectra and present the bluish-green light emission. The high photoluminescence quantum

yields ( Q PL ) of PCz-NSOs were obtained with 69–82%. Even if the current density was set as 500 mA/cm 2 , there was

unchanged for electroluminescence spectrum of PCz-NSO30, exhibiting excellent spectra stability. PCz-NSO30 obtained a

peak current effi ciency and brightness of 5.65 cd/A and 19,061 cd/m 2 , accompanied by CIE coordinates of (0.27, 0.53). It

can be inferred that NSO held promise as an eff ective moiety for achieving effi cient green light emission.

Keywords

PLED · NSO · Polycarbazole · Donor–acceptor · Green light