Pioneering research on blue “hot exciton” polymers and their application in solution-processed organic light-emitting diodes

Jiasen Zhang; Wei Li; Lingling Lyu; Qiang Wei; Yuanyuan Meng; Deli Li; Zhichuan Wang; Ming Luo; Songyu Du; Xu Xu; Xiaoli Zhang; Guohua Xie; Ziyi Ge

doi:10.1039/D3MH00676J

Pioneering research on blue “hot exciton” polymers and their application in solution-processed organic light-emitting diodes†

Jiasen Zhang,^ab Wei Li,*^ab Lingling Lyu,^c Qiang Wei,*^ab Yuanyuan Meng,^ab Deli Li,^d Zhichuan Wang,^abe Ming Luo,^ab Songyu Du,^ab Xu Xu,^c Xiaoli Zhang,

^e Guohua Xie

*^f and Ziyi Ge

*^ab

Author affiliations

* Corresponding authors

^a Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, P. R. China
E-mail: liwei1987@nimte.ac.cn, weiqiang@nimte.ac.cn, geziyi@nimte.ac.cn

^b Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, P. R. China

^c Ningbo Dayang Technology Co., Ltd., Ningbo 315000, P. R. China

^d State Key Laboratory of Luminescent Materials and Devices and Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, Wushan Road 381, Tianhe District, Guangzhou 510640, Guangdong Province, P. R. China

^e School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, People's Republic of China

^f Sauvage Center for Molecular Sciences, Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, Department of Chemistry, Wuhan University, Wuhan 430072, P. R. China

Abstract

An innovative novel category of polymeric hybridized local and charge-transfer (HLCT) blue materials prepared via solution processing has yet to be reported. This study introduces three polymers, namely PZ1, PZ2, and PZ3, incorporating donor–acceptor–donor (D–A–D) structures with carbazole functioning as the donor and benzophenone as the acceptor. To regulate the luminescence mechanism and conjugation length, carbonyl and alkyl chains are strategically inserted into the backbone. Theoretical calculation and transient absorption spectroscopy illustrate that the robust spin-orbit coupling between high-lying singlet excited states (S_m: m ⩽ 4) and triplet excited states (T_n: n ⩽ 7) of the polymers hastens and significantly heightens the efficiency of reverse intersystem crossing processes from T_n states. Furthermore, the existence of multiple degenerated frontier molecular orbits and significant overlaps between T_n and S_m states give rise to added radiative pathways that boost the radiative rate. This study marks a fundamental and initial manifestation of HLCT materials within the polymer field and provides a new avenue for the design of highly efficient polymeric emitters.

This article is part of the themed collection: Celebrating the 20th Anniversary of the Ningbo Institute of Materials Technology and Engineering

Materials Horizons

Pioneering research on blue “hot exciton” polymers and their application in solution-processed organic light-emitting diodes†

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Pioneering research on blue “hot exciton” polymers and their application in solution-processed organic light-emitting diodes

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