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.
Highlights
Glass Composition on LuminescenceOwing to excellent optical properties [1,2,3], all inorganic halide perovskites CsPbX3(X = Cl, Br, I) quantum dots (QDs) have attracted great attention in various fields [4,5,6,7,8,9], especially in light-emitting diode (LED) lighting, lasers, and solar cells
We studied the structural evolution of CsPbBr3 QDs in the glass matrix by adjusting the types of glass network modifiers without significantly changing the B2 O3 -Al2 O3 -SiO2 -based glass network structure
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
Summary
Due to the soft ionic nature of the halide perovskite QDs, improving their stability has always been an important research direction in practical applications [10,11,12,13]. The current mainstream view about distinct optical properties is that the glass compositions have an important effect on the cationic doping, interface modification, and crystallization kinetics change of CsPbX3 QDs in a glass matrix. The diffusion kinetics of precursor ions of CsPbX3 QDs can be changed by adjusting the glass network structure [26,27,28,29], which affects the optical properties of the QDs in a glass matrix. The stability of CsPbX3 QDs in different glass matrixes is distinct, which is believed to be determined by the resistance against hydration and oxygen of the glass matrix itself. Water-induced crystallization of halide perovskite QDs can be and Structure of CsPbBr3 Quantum
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