Single Organic Cation Engineering Cu(I)-Based Ionic and Coordinate Type Halides as High-Efficiency Hydrogel...

Area of Science:

• Materials Science
• Solid-State Chemistry
• Radiological Physics

Background:

• Copper(I)-based halide scintillators show promise for X-ray detection.
• Rational design is hindered by a lack of theoretical frameworks for structure-property correlations.

Purpose of the Study:

• To design novel Cu(I)-based hybrid metal halides with controlled bonding modes.
• To investigate their scintillation properties and potential for X-ray detection and imaging.

Main Methods:

• Design and synthesis of Cu₂I₄-IC (ionic) and Cu₄I₄-CC (coordination) compounds.
• Characterization of photoluminescence quantum yield (PLQY), light yield, and detection limits.
• Development of a Cu₄I₄-CC-based scintillator hydrogel with PVA, H₂O, and DMSO.
• Evaluation of X-ray imaging resolution and mechanical properties of the hydrogel film.

Main Results:

• Cu₂I₄-IC exhibits blue emission (91% PLQY), Cu₄I₄-CC shows yellow emission (100% PLQY).
• Cu₄I₄-CC achieves a high light yield (67,500 photons MeV^-1) and low detection limit (47.3 nGy s^-1).
• The Cu₄I₄-CC@PVA hydrogel film (10 × 10 cm²) provides 14 lp mm^-1 resolution and exhibits excellent plasticity and stretchability.

Conclusions:

• Bonding mode control engineering successfully yields Cu(I)-based halides with distinct emission properties.
• The Cu₄I₄-CC@PVA hydrogel represents a high-performance, flexible scintillator for advanced X-ray imaging, even in harsh environments.