Various solid solution-based fluorescence nanoparticles such as CuInS2, AgInS2 and ZnS-AgInS2 (ZAIS) have drawn the attention because of its heavy metal-free nature, longer fluorescence lifetime, higher brightness, and emission wavelength tuning by the composition ratios. Herein, we designed (ZnxAgyInz)S2 (ZAIS) nanoparticle library by fixing Zn component at a ratio of 0.1 and varying the In as well as Ag rations, in order to search the optimal quantum yields, emission wavelength, and their intensities according to the Zn, In and Ag ratios. As a result, we could specify and find out the specific composition ratios of Ag, In, and Zn which are optimal for the fluorescence properties of a specific emission wavelength. In addition, we investigated the effect of initial synthetic temperature by adjusting the starting synthetic temperatures (both 40°C to 120°C) and measuring the change in fluorescence intensities and the quantum efficiencies of the wavelength. We hypothesized that AgInS2 seeds are initially formed at low temperature and Zn layer would be formed as the temperature rises. Its internal structure seems to be pseudo core-shell type of nanoparticles. On the other hand, the distribution of each component of ZnAgInS2 is relatively uniform at high temperature due to the formation of ZnAgInS2 seeds at the temperature. Finally, we showed both TEM and its EDX mapping analysis to ascertain the distribution of each component (Zn, Ag, In, S). We further analyzed them by comparing their XRD spectra to the spectrum of AgInS2 and ZnAgInS2, respectively.

Investigation of the influence of sonochemical parameters and initial temperature study on (ZnxAgyInz)S2 synthesis mechanism

2019 Fall National Meeting

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