|Visnyk of the Lviv University. Series Physics
56 (2019) ñ. 122-132
The influence of synthesis conditions on the luminescentic-kinetic properties of colloid nanoparticles CsPbBr3
M. P. Dendebera, Ya. M. Chornodolskyy, A. V. Zhyshkovych, V. M. Salapak, N. E. Mitina, R. V. Gamernyk, V. V. Vistovskyy, A. S. Voloshinovskii
(íå ìåíøå 1800 çíàê³â) In this paper we propose a modified ligand-assisted reprecipitation technique for the synthesis of CsPbBr3 colloidal nanoparticles, which allows producing nanoparticles with small dispersion of nanoparticles size. The technique allows to obtain samples of colloidal nanoparticles with an exciton luminescence band at 510 nm. It is shown that the synthesis conditions of colloidal nanoparticle affect on dispersion in nanoparticles size. According to results of studies of photoluminescence intensity dependence at different excitation power, it can be assumed that the luminescence of colloidal CsPbBr3 nanoparticles most likely have the exciton nature. The thickness of the nanoparticles estimated by the magnitude of the high-energy shift of the luminescence band of the nanoparticles in compare to the luminescence of single crystals is about 8 nm. It is shown that nanoparticles obtained using precursors solutions heated up to the boiling point have a much narrower distribution in lateral sizes in compare to colloidal nanoparticles synthesized without heating. The luminescence decay times of two samples obtained under different synthesis conditions have two-exponential form, however its homogeneity for a different luminescence wavelengths within the contour of the radiation band are significantly different. It is assumed that our samples differ in the dispersion of the lateral size of the nanoparticles, since the nanocrystals have the form of thin rectangular plates whose thickness are indicated by the position the luminescence bands of studied samples. It is shown that the nanoparticle size dispersion can be analized by studying luminescence decay times in different wavelengths within the luminescence band contour.
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