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<p>Copper(I) nanoclusters (NCs), compared to other commercial scintillators, exhibit ease of synthesis and cost-effectiveness, demonstrating significant potential for application as X-ray scintillators. However, synthesizing atomically precise alkynyl copper(I) NCs with high luminescence is still challenging. Here, eight propeller-shaped Cu<sub>9</sub> NCs were successfully synthesized. Each features a unique triangular prismatic Cu<sub>6</sub> core, which exhibits significant structural differences compared to other copper (I) halide NCs. By modifying triphenylphosphine derivatives and halogens, the Cu<sub>9</sub> NCs exhibited their highest photoluminescence quantum yield (PLQY) of 43% for <b>2-CF</b><sub><b>3</b></sub>. Comprehensive structural elucidation alongside photophysical and computational analyses have unveiled the mechanisms underlying the thermally activated delayed fluorescence (TADF) performance of these Cu<sub>9</sub> NCs. A white light-emitting diode (LED) fabricated using <b>2-CF</b><sub><b>3</b></sub> powder demonstrates a color rendering index (<i>Ra</i>) of 73.5. Notably, the radioluminescence (RL) of <b>2-CF</b><sub><b>3</b></sub> was found to demonstrate a scintillating light yield of 4,924 photons/MeV and a low detection limit of 1.239 µGy/s. Furthermore, the X-ray imaging resolution of 25.4 line pairs/mm was reported for the <b>2-CF</b><sub><b>3</b></sub> screen, representing the top resolution achieved so far for organic-inorganic hybrid scintillators. This investigation not only represents the first observation of TADF and RL behaviors in alkynyl copper(I) NCs but also provides new insights into advancing scintillator design.</p>

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Alkynyl copper(I) nanoclusters with thermally activated delayed fluorescence as efficient scintillator for X-ray imaging

  • 期刊论文

  • 发表日期：

    2025年4月22日

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  • Jun-Jie Fang,
  • Zheng Liu,
  • Yu Zhang,
  • Zhi-Yi Wang,
  • Yun-Peng Xie,
  • Xing Lu

摘要

Copper(I) nanoclusters (NCs), compared to other commercial scintillators, exhibit ease of synthesis and cost-effectiveness, demonstrating significant potential for application as X-ray scintillators. However, synthesizing atomically precise alkynyl copper(I) NCs with high luminescence is still challenging. Here, eight propeller-shaped Cu9 NCs were successfully synthesized. Each features a unique triangular prismatic Cu6 core, which exhibits significant structural differences compared to other copper (I) halide NCs. By modifying triphenylphosphine derivatives and halogens, the Cu9 NCs exhibited their highest photoluminescence quantum yield (PLQY) of 43% for 2-CF3. Comprehensive structural elucidation alongside photophysical and computational analyses have unveiled the mechanisms underlying the thermally activated delayed fluorescence (TADF) performance of these Cu9 NCs. A white light-emitting diode (LED) fabricated using 2-CF3 powder demonstrates a color rendering index (Ra) of 73.5. Notably, the radioluminescence (RL) of 2-CF3 was found to demonstrate a scintillating light yield of 4,924 photons/MeV and a low detection limit of 1.239 µGy/s. Furthermore, the X-ray imaging resolution of 25.4 line pairs/mm was reported for the 2-CF3 screen, representing the top resolution achieved so far for organic-inorganic hybrid scintillators. This investigation not only represents the first observation of TADF and RL behaviors in alkynyl copper(I) NCs but also provides new insights into advancing scintillator design.