Abstract
The luminescence properties of a composite consisting of mesoporous silica and mercury diiodide nanoparticles formed in silica nanopores have been investigated. The formation of nanoparticles was carried out by evaporation of the HgI2 solution introduced into the SiO2 nanopores. It was found that the photoluminescence of the HgI2@mSiO2 composite is due to the glow of mercury diiodide, while the emission spectrum is significantly shifted towards shorter wavelengths with respect to the emission spectrum of bulk HgI2 crystals. The shift of the HgI2 emission spectrum to the short-wavelength side is explained by quantum-size effects in the electronic spectrum of HgI2 nanoparticles being part of composite, and the significant width of the spectrum is explained by its inhomogeneous broadening due to the dependence of the band gap of nanodots on their size d. The shape of the size distribution function of HgI2 nanodots was estimated and it was shown that it is characterized by a rather narrow maximum at dM = 2.2 nm, which is ~2/3 of the nanopore diameter in the SiO2 matrix (~3 nm).
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This work was partially supported by the Russian Foundation for Basic Research (project no. 20-03-00656).
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Starukhin, A.N., Nelson, D.K., Kurdyukov, D.A. et al. Investigation of the Photophysical Properties of the HgI2@mSiO2 Nanocomposite. Phys. Solid State 63, 1311–1316 (2021). https://doi.org/10.1134/S106378342108028X
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DOI: https://doi.org/10.1134/S106378342108028X