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Chiral Hybrid Cu(I) Halide Scintillation Films with Polarization-Engineered Light Management for High-Resolution

Shuai Zhang1, Hao Wang1, Yilan Wang2

  • 1State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, Guangdong Engineering Technology Research and Development Centre of Special Optical Fiber Materials and Devices, School of Physics and Optoelectronics, South China University of Technology, Guangzhou, 510641, China.

Angewandte Chemie (International Ed. in English)
|September 25, 2025
PubMed
Summary

Chiral hybrid copper(I) halide scintillators were synthesized, achieving high photoluminescence quantum yield and circularly polarized luminescence. These chiral materials enable directional light propagation, significantly improving X-ray imaging resolution and detection limits.

Keywords:
Chiral hybrid Cu(I) halidesPhotoluminescenceRadioluminescenceScintillation filmsX‐ray imaging

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Crystallography

Background:

  • Traditional scintillators use achiral structures, leading to isotropic light emission.
  • Isotropic light propagation causes optical crosstalk and reduces image quality in X-ray imaging.
  • Developing novel scintillators with directional light control is crucial for advanced imaging.

Purpose of the Study:

  • To design and synthesize chiral hybrid copper(I) halide scintillators.
  • To investigate their photoluminescence properties, including quantum yield and circular polarization.
  • To fabricate thin films for high-resolution X-ray imaging applications.

Main Methods:

  • Synthesis of R-2-MePiCuI and S-2-MePiCuI chiral scintillators.
  • Characterization of photoluminescence quantum yield (PLQY) and circularly polarized luminescence (CPL).
  • Fabrication of thin films using multi-source vacuum deposition (MSVD) and integration into a polarized system.

Main Results:

  • Achieved near-unity PLQY (99.08% and 98.38%) and distinct CPL with dissymmetry factors (glum).
  • Fabricated dense, uniform chiral Cu(I) halide thin films.
  • Developed a polarized system demonstrating directional radioluminescence and suppressed crosstalk.
  • Attained high spatial resolution (20 lp mm-1) and ultralow detection limit (99.22 nGy s-1).

Conclusions:

  • Chiral hybrid Cu(I) halides show significant potential for advanced X-ray imaging.
  • The developed chiral scintillators offer synergetic light management for improved performance.
  • This work paves the way for next-generation high-resolution and sensitive X-ray detection systems.