Green Synthesis and Photoluminesce Study of Dy Doped CaCO3

Abstract

In this study, we used water-soluble polysaccharides from melon to develop a new green method for the biological production of calcium carbonate crystals. SEM, FT-IR spectroscopy, and X-ray powder diffractometry were used to examine the resulting crystals. The host material is prepared with the amount of 5.549gm CaCl₂ and 5.2994gm Na₂CO₃. In the sintering process, the sample is subjected to its melting temperature in a furnace and then cooled evenly. The phosphor CaCO₃ is doped with differing proportions of Dy and SEM micrographs validate the material's nanostructure, which is essential for luminescence. By Dy doping with CaCO_3, then crystal structure of a molecule shows prominent XRD peaks. In UV photoluminescence spectra, the greatest emission peak is at 578nm while slake curve shows that for 3 mol% Dy concentrations, show higher luminescence intensity. As the Dy concentration rises over 3 mol%, the brightness intensity decreases due to quenching phenomena.