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<p>Pure organic room-temperature phosphorescence (RTP) has drawn broad attention due to its long persistent luminescence and large Stokes shift. Although the doping strategy has become one of the most effective methods to construct organic RTP systems, there is still some fuzziness of impurities, mechanisms and luminescence regulation. This study develops a series of doping RTP systems based on exciplex, in which BPC@PPZ (where BPC is <i>N</i>-(4-bromophenyl)-carbazole, PPZ is 10-phenyl-10<i>H</i>-phenothiazine) achieved the highest quantum yield of 36.3%, while BPC@CE (where CE is coronene) showed the longest lifetime of 628.5 ms. The relevant data verify the mechanism that RTP comes from the charge transfer (CT) state of exciplex. Further, the introduction of Nile Red into the exciplex system results in the triple-singlet Förster resonance energy transfer, exhibiting a red delayed fluorescence. Besides, when incorporating the coumarin derivatives into doping system, distinct <sup>1</sup>CT*&amp;<sup>3</sup>CT* states are generated through the CT process, accompanying a brand-new long persistent luminescence excited by visible light. These findings present an approach to regulate the CT state for achieving different persistent luminescence in the multicomponent system.</p>

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Fine regulation of charge recombination for multi-color persistent luminescence

  • 期刊论文

  • 发表日期：

    2025年1月22日

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  • Ping Jiang,
  • Bingbing Ding,
  • Tao Li,
  • Chao Wang,
  • Ziyi Wang,
  • Wenbin Liu,
  • Xiang Ma

摘要

Pure organic room-temperature phosphorescence (RTP) has drawn broad attention due to its long persistent luminescence and large Stokes shift. Although the doping strategy has become one of the most effective methods to construct organic RTP systems, there is still some fuzziness of impurities, mechanisms and luminescence regulation. This study develops a series of doping RTP systems based on exciplex, in which BPC@PPZ (where BPC is N-(4-bromophenyl)-carbazole, PPZ is 10-phenyl-10H-phenothiazine) achieved the highest quantum yield of 36.3%, while BPC@CE (where CE is coronene) showed the longest lifetime of 628.5 ms. The relevant data verify the mechanism that RTP comes from the charge transfer (CT) state of exciplex. Further, the introduction of Nile Red into the exciplex system results in the triple-singlet Förster resonance energy transfer, exhibiting a red delayed fluorescence. Besides, when incorporating the coumarin derivatives into doping system, distinct 1CT*&3CT* states are generated through the CT process, accompanying a brand-new long persistent luminescence excited by visible light. These findings present an approach to regulate the CT state for achieving different persistent luminescence in the multicomponent system.