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<p>Long-persistent afterglows based on organic donor-acceptor systems feature ultra-long duration reaching hours, leading to the advantages in long-time-range display and bio/medical applications. However, the understanding of this optical phenomenon is insufficient. Herein, dibenzothiophene-phosphine oxide hybrids named nDBTxPO with different room temperature phosphorescence characteristics are used as acceptor matrixes. It shows that after doping N,N,N′,N′-tetramethylbenzidine (TMB) as donor, afterglow intensities and durations of nDBTxPO:1% TMB are strongly correlated to the stabilized triplet state (T<sub>n</sub>*) properties of nDBTxPO. Compared to other congeners, high-population and high-lying T<sub>n</sub><sup>*</sup> state of 28DBTDPO matrix supports the positive and efficient energy transfer to <sup>n</sup>CT<sup>*</sup> states of 28DBTDPO-TMB local dipoles in the doped film. This energy relay between two long-persistent T<sub>n</sub><sup>*</sup> and <sup>n</sup>CT<sup>*</sup> states is the key determinant resulting in the longest afterglow of 28DBTDPO:1% TMB. This work provides clear insight into energy transfer for lightly-doping donor-acceptor systems, therefore will promote the accurate system design for practical applications.</p>

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Ultralong afterglow enabled by energy relay from room-temperature phosphorescent matrixes to local dipoles

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月1日

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  • Chunying Zhang,
  • Guang Lu,
  • Zicheng Wang,
  • Ying Zhao,
  • Yi Man,
  • Jing Zhang,
  • Chunbo Duan,
  • Chunmiao Han,
  • Hui Xu

摘要

Long-persistent afterglows based on organic donor-acceptor systems feature ultra-long duration reaching hours, leading to the advantages in long-time-range display and bio/medical applications. However, the understanding of this optical phenomenon is insufficient. Herein, dibenzothiophene-phosphine oxide hybrids named nDBTxPO with different room temperature phosphorescence characteristics are used as acceptor matrixes. It shows that after doping N,N,N′,N′-tetramethylbenzidine (TMB) as donor, afterglow intensities and durations of nDBTxPO:1% TMB are strongly correlated to the stabilized triplet state (Tn*) properties of nDBTxPO. Compared to other congeners, high-population and high-lying Tn* state of 28DBTDPO matrix supports the positive and efficient energy transfer to nCT* states of 28DBTDPO-TMB local dipoles in the doped film. This energy relay between two long-persistent Tn* and nCT* states is the key determinant resulting in the longest afterglow of 28DBTDPO:1% TMB. This work provides clear insight into energy transfer for lightly-doping donor-acceptor systems, therefore will promote the accurate system design for practical applications.