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<p>Pure organic room-temperature phosphorescent (RTP) polymers possess good processability and flexibility over small molecular crystals. However, most of RTP polymers reported so far are based on non-conjugated polymers, and achieving efficient phosphorescent emission in RTP conjugated polymers (CPs) remains a significant challenge. Herein, we developed two RTP CPs (P(PSeZPh-<i>p</i>-Ph) and P(PSeZPh-<i>m</i>-Ph)) by linking the phenoselenazine units with the para- and meta-phenylene units, respectively, to form the conjugated main chains. The phenylene linker with different lingking mode manipulates the effictive <i>π</i>-conjugation of the polymer backbones. Comparing with the para-linked P(PSeZPh-<i>p</i>-Ph), meta-linked P(PSeZPh-<i>m</i>-Ph) exhibit the decreased effective <i>π</i>-conjugation and the enhanced contribution of selenium atoms to the frontier orbitals, leading to the larger spin-orbit coupling (SOC) constants and the accelerated phosphorescence radiative decay process. The P(PSeZPh-<i>m</i>-Ph) achieves a phosphorescence quantum yield of 21.4% in doped polystyrene films, which is among the highest efficiencies reported to date for pure organic RTP CPs. These CPs are applied to construct phosphorescent film sensors for oxygen detection with the high quenching constants (<i>K</i><sub>sv</sub>) up to 14.80 kPa<sup>−1</sup> and low detection of limit of 0.84 ppm, demostrating the potential for application in oxygen film sensors.</p>

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Meta-linked Phenoselenazine-based Conjugated Polymers for Efficient Room-temperature Phosphorescence

  • 期刊论文

  • 发表日期：

    2026年1月23日

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  • Shan-Hui Gao,
  • Zhi-Qiang Cheng,
  • Xiao-Fu Wu,
  • Hui Tong,
  • Li-Xiang Wang

摘要

Pure organic room-temperature phosphorescent (RTP) polymers possess good processability and flexibility over small molecular crystals. However, most of RTP polymers reported so far are based on non-conjugated polymers, and achieving efficient phosphorescent emission in RTP conjugated polymers (CPs) remains a significant challenge. Herein, we developed two RTP CPs (P(PSeZPh-p-Ph) and P(PSeZPh-m-Ph)) by linking the phenoselenazine units with the para- and meta-phenylene units, respectively, to form the conjugated main chains. The phenylene linker with different lingking mode manipulates the effictive π-conjugation of the polymer backbones. Comparing with the para-linked P(PSeZPh-p-Ph), meta-linked P(PSeZPh-m-Ph) exhibit the decreased effective π-conjugation and the enhanced contribution of selenium atoms to the frontier orbitals, leading to the larger spin-orbit coupling (SOC) constants and the accelerated phosphorescence radiative decay process. The P(PSeZPh-m-Ph) achieves a phosphorescence quantum yield of 21.4% in doped polystyrene films, which is among the highest efficiencies reported to date for pure organic RTP CPs. These CPs are applied to construct phosphorescent film sensors for oxygen detection with the high quenching constants (Ksv) up to 14.80 kPa−1 and low detection of limit of 0.84 ppm, demostrating the potential for application in oxygen film sensors.