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Metal Halide Perovskite Enriched with Entropy-Induced Lattice Distortion for Enhanced X-ray Detection.

Yangmin Tang1,2,3, Guiqiang Pu1, Qiunan Liu4

  • 1Zhejiang Key Laboratory for Island Green Energy and New Materials, Institute of Electrochemistry, School of Materials Science and Engineering, Taizhou University, Taizhou 318000, China.

ACS Nano
|August 16, 2025
PubMed
Summary

Entropy engineering in metal halide perovskites (MHPs) enhances X-ray detection. This strategy boosts photoluminescence and enables high-resolution imaging for medical diagnostics and nondestructive testing.

Keywords:
X-ray imagingentropy engineeringexciton localizationinorganic metal halide perovskitestheoretical calculation

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Optoelectronics

Background:

  • Scintillator-based X-ray imaging is crucial for medical diagnostics and nondestructive testing.
  • Low-dimensional metal halide perovskites (MHPs) show promise for scintillation due to their structural flexibility.
  • Improving photoemission performance in low-dimensional MHPs by localizing excitonic emission is a key challenge.

Purpose of the Study:

  • To develop novel four-element Cs2MCl6 vacancy-ordered double-perovskite scintillators using entropy engineering.
  • To enhance X-ray detection capabilities through improved photoluminescence performance.
  • To investigate the underlying mechanisms responsible for enhanced emission and their implications for imaging.

Main Methods:

  • Entropy engineering was employed to synthesize four-element Cs2MCl6 (M = Te4+, Sn4+, Zr4+, Hf4+) perovskites.
  • Structural characterizations and theoretical calculations were used to analyze lattice distortion and configurational entropy.
  • Femtosecond transient absorption and temperature-dependent spectroscopy were performed to study exciton dynamics and electron-phonon interactions.

Main Results:

  • An 8-fold increase in photoluminescence quantum yield and a 17-fold increase in photoluminescence intensity were achieved.
  • A low detection limit of 50.3 nGy s-1 for X-ray detection was demonstrated.
  • High-entropy Cs2MCl6 enabled a flexible scintillation screen with over 20 lp mm-1 resolution for X-ray imaging.

Conclusions:

  • Entropy engineering effectively enhances photoluminescence in MHPs by inducing lattice distortion and promoting exciton confinement.
  • The developed Cs2MCl6 scintillators offer superior performance for X-ray detection and imaging applications.
  • This approach provides a promising pathway for advancing radiation detection and optoelectronic devices.