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Area of Science:

  • Materials Science
  • Radiological Physics
  • Organic Chemistry

Background:

  • Expanding applications of X-ray scintillation in healthcare and security necessitate advanced materials.
  • Current scintillators require improvements in sensitivity, efficiency, and processing versatility.
  • Organic metal halide complexes offer potential for novel scintillator development.

Purpose of the Study:

  • To report the first use of organic metal halide complexes with aggregation-induced emission (AIE) for X-ray scintillation.
  • To synthesize and characterize a novel AIE-based organic metal halide complex for X-ray detection.
  • To evaluate the performance of the new material in terms of sensitivity, efficiency, and response linearity.

Main Methods:

  • Synthesis of organic metal halide complex (TPA-PD)2ZnCl2 from AIE molecule TPA-PD and ZnCl2.
  • Optical characterization including photoluminescence (PL) and radioluminescence (RL) spectroscopy.
  • Performance evaluation for X-ray scintillation, including dose-response linearity and limit of detection.

Main Results:

  • High synthetic yield (87%) of (TPA-PD)2ZnCl2 achieved via solution-phase reaction.
  • Exhibited bluish-green radioluminescence (peak ~450 nm) with high PLQE (65%) and light yield (13,423 Photon/MeV).
  • Demonstrated excellent dose-response linearity and a low limit of detection (80.23 nGyair s−1) for X-ray detection.

Conclusions:

  • Organic metal halide complexes with AIE properties represent a promising new class of solution-processable scintillators.
  • The combination of metal halide X-ray absorption and AIE fast radioluminescence enhances scintillator performance.
  • This design opens avenues for developing high-performance, versatile X-ray scintillators for diverse applications.