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Intermolecular Aggregation-Induced Delayed Fluorescence Scintillators for Ultrahigh-Resolution X-Ray Imaging.

Jie Yuan1,2, Ying Liu3, Botao Zheng1

  • 1State Key Laboratory of Flexible Electronics (LoFE) & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, Nanjing, China.

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Summary

Researchers developed a new organic X-ray scintillator strategy using intermolecular aggregation-induced delayed fluorescence (AIDF). This method overcomes quenching issues, enabling efficient X-ray detection and high-resolution medical imaging with improved performance.

Keywords:
X‐ray imagingaggregation‐induced delayed fluorescencehigh spatial resolutionorganic X‐ray scintillatorsthin‐film

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Radiological Physics

Background:

  • Organic X-ray scintillators (OXSTs) offer promise for radiation detection and medical imaging due to their properties.
  • Aggregation-caused quenching (ACQ) hinders efficient solid-state emission and exciton utilization in OXSTs.

Purpose of the Study:

  • To introduce a novel intermolecular aggregation-induced delayed fluorescence (AIDF) strategy to overcome ACQ.
  • To develop high-performance OXSTs for advanced radiation detection and imaging applications.

Main Methods:

  • Designed and synthesized a tailored emitter exhibiting aggregation-induced emission and thermally activated delayed fluorescence (TADF).
  • Incorporated the emitter into a polysulfone host to create composite films.
  • Evaluated the radioluminescence properties, exciton utilization, and X-ray imaging performance.

Main Results:

  • The developed emitter demonstrated efficient intermolecular AIDF with sub-microsecond delayed lifetimes.
  • Composite films showed bright, stable radioluminescence with significant resistance to concentration quenching.
  • Achieved an ultralow detection limit (0.255 µGy s⁻¹) and high spatial resolution (20.0 lp mm⁻¹).

Conclusions:

  • The intermolecular AIDF strategy effectively circumvents ACQ, enabling efficient exciton harvesting.
  • The developed OXSTs outperform many organic and some inorganic counterparts in sensitivity and resolution.
  • This work provides a molecular design paradigm for high-resolution, thin-film scintillators for medical imaging.