<i>In Situ</i> Crystallization of CsPbBr<sub>3</sub> Nanocrystals within a Melt-Quenched Glassy Coordination Polymer.
basic_science · Level V
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- Record sourced from PubMed, PMID 39871484.
- Also identified by DOI 10.1021/acsnano.4c12049.
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Abstract
Lead halide perovskite nanocrystal materials such as CsPbX<sub>3</sub> (X = Cl, Br, and I) have triggered an intense research upsurge due to their excellent scintillation performance. Herein, an <i>in situ</i> crystallization strategy is developed to grow CsPbBr<sub>3</sub> nanocrystals (NCs) within a low-melting-point (280 °C) coordination polymer (CP) glass. The viscosity of coordination glass is reduced through a low-temperature (e.g., 50 °C) thermal treatment, enabling the short-distance migration of uniformly dispersed ions (Cs<sup>+</sup>, Pb<sup>2+</sup>, and Br<sup>-</sup>) to achieve <i>in situ</i> crystallization of CsPbBr<sub>3</sub> NCs. Benefiting from the high transmittance (80% within the 500-800 nm range) and outstanding scintillation performance, the prepared CsPbBr<sub>3</sub>@ZnBr<sub>2</sub>(bIm+DMSO)<sub>2</sub> (bIm = benzimidazole, DMSO = dimethyl sulfoxide) transparent luminescence glass exhibits an excellent X-ray imaging resolution of up to 25 lp/mm, outperforming many perovskite glass and crystalline scintillators. This work would provide an idea for the development of high-resolution scintillation screens that can be prepared at low temperatures.