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A direct observation of up-converted room-temperature phosphorescence in an anti-Kasha dopant-matrix system

Author

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  • Jiuyang Li

    (University of Chinese Academy of Sciences, Chinese Academy of Sciences)

  • Xun Li

    (University of Chinese Academy of Sciences, Chinese Academy of Sciences)

  • Guangming Wang

    (University of Chinese Academy of Sciences, Chinese Academy of Sciences)

  • Xuepu Wang

    (University of Chinese Academy of Sciences, Chinese Academy of Sciences)

  • Minjian Wu

    (University of Chinese Academy of Sciences, Chinese Academy of Sciences)

  • Jiahui Liu

    (University of Chinese Academy of Sciences, Chinese Academy of Sciences)

  • Kaka Zhang

    (University of Chinese Academy of Sciences, Chinese Academy of Sciences)

Abstract

It is common sense that emission maxima of phosphorescence spectra (λP) are longer than those of fluorescence spectra (λF). Here we report a serendipitous finding of up-converted room-temperature phosphorescence (RTP) with λP 0.1 s upon doping benzophenone-containing difluoroboron β-diketonate (BPBF2) into phenyl benzoate matrices. The up-converted RTP is originated from BPBF2’s Tn (n ≥ 2) states which show typical 3n-π* characters from benzophenone moieties. Detailed studies reveal that, upon intersystem crossing from BPBF2’s S1 states of charge transfer characters, the resultant T1 and Tn states build T1-to-Tn equilibrium. Because of their 3n-π* characters, the Tn states possess large phosphorescence rates that can strongly compete RTP(T1) to directly emit RTP(Tn) which violates Kasha’s rule. The direct observation of up-converted RTP provides deep understanding of triplet excited state dynamics and opens an intriguing pathway to devise visible-light-excitable deep-blue afterglow emitters, as well as stimuli-responsive afterglow materials.

Suggested Citation

  • Jiuyang Li & Xun Li & Guangming Wang & Xuepu Wang & Minjian Wu & Jiahui Liu & Kaka Zhang, 2023. "A direct observation of up-converted room-temperature phosphorescence in an anti-Kasha dopant-matrix system," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-37662-y
    DOI: 10.1038/s41467-023-37662-y
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    1. Jibiao Jin & He Jiang & Qingqing Yang & Lele Tang & Ye Tao & Yuanyuan Li & Runfeng Chen & Chao Zheng & Quli Fan & Kenneth Yin Zhang & Qiang Zhao & Wei Huang, 2020. "Thermally activated triplet exciton release for highly efficient tri-mode organic afterglow," Nature Communications, Nature, vol. 11(1), pages 1-9, December.
    2. Zikai He & Weijun Zhao & Jacky W. Y. Lam & Qian Peng & Huili Ma & Guodong Liang & Zhigang Shuai & Ben Zhong Tang, 2017. "White light emission from a single organic molecule with dual phosphorescence at room temperature," Nature Communications, Nature, vol. 8(1), pages 1-8, December.
    3. Kenry & Chengjian Chen & Bin Liu, 2019. "Enhancing the performance of pure organic room-temperature phosphorescent luminophores," Nature Communications, Nature, vol. 10(1), pages 1-15, December.
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