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<p>Near-infrared (NIR) organic scintillating materials are in high demand in a variety of fields, such as radiography, X-ray radiation therapy, and medical diagnosis. However, efficient organic NIR materials with high X-ray absorption are rarely reported. Here, we developed NIR organic X-ray imaging scintillators based on a typical organic radical with emission from a spin doublet excited state. The energy transfer strategy from thermally activated delayed fluorescence (TADF) sensitizers to the radical emitter was exploited to enhance X-ray absorption capability. The optimized scintillators with an Au(III)-TADF complex as the sensitizer exhibited intense NIR radioluminescence peaking at 746 nm upon X-ray excitation. High-quality X-ray imaging with a high spatial resolution of 15.3 lp mm<sup>−1</sup> was demonstrated, suggesting great potential for real applications. This work provides an effective strategy for the development of NIR organic scintillators.</p>

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Near-infrared organic scintillators for efficient X-ray imaging via singlet and triplet to doublet energy transfer

  • 期刊论文

  • 发表日期：

    2025年3月10日

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  • Jiawei He,
  • Tianhao Chen,
  • Bin Yu,
  • He Zhang,
  • Zhenglin Jia,
  • Qianqian Lin,
  • Shaolong Gong

摘要

Near-infrared (NIR) organic scintillating materials are in high demand in a variety of fields, such as radiography, X-ray radiation therapy, and medical diagnosis. However, efficient organic NIR materials with high X-ray absorption are rarely reported. Here, we developed NIR organic X-ray imaging scintillators based on a typical organic radical with emission from a spin doublet excited state. The energy transfer strategy from thermally activated delayed fluorescence (TADF) sensitizers to the radical emitter was exploited to enhance X-ray absorption capability. The optimized scintillators with an Au(III)-TADF complex as the sensitizer exhibited intense NIR radioluminescence peaking at 746 nm upon X-ray excitation. High-quality X-ray imaging with a high spatial resolution of 15.3 lp mm−1 was demonstrated, suggesting great potential for real applications. This work provides an effective strategy for the development of NIR organic scintillators.