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Achieving Ultrahigh Light Yield with Trace Lithium Doping: Synergistic Defect Passivation in Large-Sized Rb2CuBr3

Ying Ding1, Junnan Ma1, Xinguang Wu1

  • 1School of Materials Science and Engineering, Fujian University of Technology, Fuzhou 350118, China.

The Journal of Physical Chemistry Letters
|April 23, 2026
PubMed
Summary
This summary is machine-generated.

Researchers enhanced metal halide scintillators by doping Rb2CuBr3 crystals with lithium ions (Li+). This Li+-doped material shows improved crystal quality and significantly boosts radiation detection performance, paving the way for advanced detectors.

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Area of Science:

  • Materials Science
  • Radiation Detection
  • Solid-State Physics

Background:

  • Metal halide scintillators are crucial for radiation detection but are hindered by poor crystal quality and defects.
  • Nonradiative recombination in these materials limits their efficiency and performance.
  • Existing methods struggle to produce high-quality, large-scale scintillation crystals.

Purpose of the Study:

  • To develop an efficient strategy for improving metal halide scintillator performance.
  • To overcome limitations in crystal quality and defect-mediated nonradiative recombination.
  • To enable controllable growth of large-sized, high-performance Li-doped Rb2CuBr3 crystals.

Main Methods:

  • Incorporation of trace lithium ions (Li+) into low-dimensional Rb2CuBr3 crystals.
  • Modulation of crystallization kinetics to control crystal growth from micrometer to centimeter scale.
  • Suppression of grain-boundary defects and induction of lattice contraction through Li+ doping.

Main Results:

  • Achieved ultrahigh light yield (120,871 photons MeV-1) in X-ray-excited Li-doped Rb2CuBr3 crystals.
  • Demonstrated excellent imaging resolution (20 lp mm-1) and a low detection limit (30 μGyair s-1).
  • Observed passivation of nonradiative recombination channels due to increased exciton concentration under irradiation.

Conclusions:

  • Li+ doping provides an effective method for preparing large-sized, high-performance scintillation crystals.
  • Regulating defect states via Li+ incorporation offers a universal mechanism to surpass intrinsic performance limits.
  • This approach presents promising pathways toward developing highly efficient materials for advanced radiation detection.