Chem. J. Chinese Universities ›› 2026, Vol. 47 ›› Issue (4): 20250388.doi: 10.7503/cjcu20250388

• Article • Previous Articles     Next Articles

Strategies for Constructing and Organic Afterglow Tuning of Phenothiazine Fused Ring Systems

LIU Peipei1, YAN Wanting1, YUAN Wentao1, LI Qianqian1(), LI Zhen1,2()   

  1. 1.Hubei Key Lab on Organic and Polymeric Opto?Electronic Materials,College of Chemistry and Molecular Sciences,Wuhan University,Wuhan 430072,China
    2.College of Chemistry and Chemical Engineering,Hubei University,Wuhan 430062,China
  • Received:2025-12-22 Online:2026-04-10 Published:2026-01-21
  • Contact: LI Qianqian, LI Zhen E-mail:liqianqian@whu.edu.cn;lizhen@whu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22235006)

Abstract:

Based on the phenothiazine core, we have synthesized three pentacyclic derivatives(E‑2NAP, Z‑2NAP, and Ph‑ANT), together with two hexacyclic derivatives(E‑NAP‑ANT and Z‑NAP‑ANT). In the pentacyclic series, the asymmetric derivative E‑2NAP shows stronger afterglow emission in frozen solution(77 K) than that of the symmetric Z‑2NAP. In the solid state, Ph‑ANT exhibits distinct thermally responsive behavior, with an afterglow lifetime reaching a maximum of 119.68 ms at 293 K, which is primarily attributed to a thermally activated delayed fluorescence(TADF) mechanism. Above 293 K, competition emerges between the TADF pathway and non‑radiative decay channels of triplet excitons, resulting in a reduction in afterglow lifetime. In summary, through rational modulation of the fused‑ring number and substitution positions, this work demonstrates effective adjustment of molecular conformation, solid‑state packing, and room‑temperature afterglow properties, providing important insights for the molecular design of phenothiazine‑based room‑temperature afterglow materials.

Key words: Phenothiazine fused ring, Molecular conformation, Afterglow property

CLC Number: 

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