Citation: Man Xu, Qianyi Li, Jingyao Ma, Hao Li, Yunfei Zhu, Fan Yu, Kuande Wang, Tao Zhou, Quanyou Feng, Linghai Xie, Jinyi Lin. Wide bandgap steric carbazole-fluorene-nanogrid polymers via metal-free CN polymerization for deep-blue polymer light-emitting diodes[J]. Chinese Chemical Letters, ;2026, 37(1): 111551. doi: 10.1016/j.cclet.2025.111551 shu

Wide bandgap steric carbazole-fluorene-nanogrid polymers via metal-free CN polymerization for deep-blue polymer light-emitting diodes

Man Xu ^a ,
Qianyi Li ^a ,
Jingyao Ma ^a ,
Hao Li ^a ,
Yunfei Zhu ^a ,
Fan Yu ^a ,
Kuande Wang ^a ,
Tao Zhou ^a ,
Quanyou Feng ^{a, *,} ,
Linghai Xie ^{a, *,} ,
Jinyi Lin ^{b, c, *,}

a.
State Key Laboratory of Flexible Electronics (KLoFE) & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, Nanjing 210023, China
b.
State Key Laboratory of Flexible Electronics (KLoFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), Nanjing 211816, China
c.
Institute of Quantum and Sustainable Technology (IQST), School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China

iamqyfeng@njupt.edu.cn

iamlhxie@njupt.edu.cn

iamjylin@njtech.edu.cn

Received Date: 6 November 2024
Revised Date: 3 July 2025
Accepted Date: 6 July 2025
Available Online: 7 July 2025

Figures(4)

To precisely control intrachain π-electron delocalization and interchain interaction simultaneously is the prerequisite to obtain stable and efficient deep-blue light-emitting p-n polymer semiconductors for the polymer light-emitting diodes (PLEDs). Herein, we introduced the steric carbazole-fluorene nanogrid into light-emitting diphenyl sulfone-based p-n polymer semiconductors (PG and PDG) via metal-free CN coupling polymerization for the fabrication of deep-blue PLEDs. The steric, rigid and twisted configuration between nanogrid and diphenyl sulfone in PG and PDG present the unique characteristic of large steric hindrance interaction to suppress interchain aggregation in solid state. Due to the different length of electron-deficient diphenyl sulfone monomers, PG showed a deep-blue emission with a maximum peak at 428 nm but red-shifted to 480 nm for the PDG films. Interestingly, similar deep-blue emission behavior of PG in diluted non-polar solution and films suggested the extremely weak interchain aggregation. Finally, PLEDs based on PG are fabricated with a stable deep-blue emission of CIE (0.15, 0.10), and corresponding EL spectral profile is also completely identical to PL ones of diluted solution, revealed the intrachain emission without obvious interchain excited state, confirmed effectiveness of the steric hindrance functionalization of nanogrid in p-n polymer semiconductor for deep-blue light-emitting organic optoelectronics.
- p-n polymer semiconductors,
- Metal-free C-N polymerization,
- Steric carbazole-fluorene nanogrid,
- Diphenyl sulfone,
- Deep-blue polymer light-emitting diodes
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