Effect of Glass Composition on Luminescence and Structure of CsPbBr₃ Quantum Dots in an Amorphous Matrix

Abstract

Glass matrix embedding is an efficient way to improve the chemical and thermal stability of the halide perovskite QDs. However, CsPbX₃ QDs exhibit distinct optical properties in different glass matrixes, including photoluminescence (PL) peak position, PL peak width, and optical band gap. In this work, the temperature-dependent PL spectra, absorption spectra, high-energy X-ray structure factor S(Q), and pair distribution function (PDF) were integrated to analyze the structural evolution of CsPbBr₃ QDs in different glass matrixes. The results show that the lattice parameters and atomic spacing of CsPbBr₃ QDs are affected by the glass composition in which they are embedded. The most possibility can be attributed to the thermal expansion mismatch between CsPbBr₃ QDs and the glass matrix. The results may provide a new way to understand the effect of the glass composition on the optical properties of CsPbBr₃ QDs in a glass matrix.