Ultralong afterglow enabled by energy relay from room-temperature phosphorescent matrixes to local dipoles.
basic_science · Level V
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- Record sourced from PubMed, PMID 40592846.
- Also identified by DOI 10.1038/s41467-025-60863-6 and PMC identifier 12214820.
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Abstract
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.