The influence of Tm${}^{3+}$ on the structural, morphological, lifetime, haemocompatibility, and optical properties of sol-gel-synthesized CaS phosphors

The purpose of this study was to select calcium sulphide as a host for the synthesis of phosphor, which would be an excellent luminous material for biomedical purposes. An easy sol-gel method was used to synthesize calcium sulphide that has been activated by thulium. Using PXRD, the structural analysis was performed, the structure was found to be monoclinic and the structural parameters were calculated using PXRD data. AFM was used to investigate the surface morphology, and Gwyddion software was utilized to determine the grain size. From UV-DRS and photoluminescence spectroscopy, optical characteristics were examined. The Tauc plot was drawn by using UV spectroscopy data to determine the optical band gap, which was calculated to lie between 3.8 and 4.2 eV. The PL peaks were discovered in the visible spectrum at wavelengths of around 640 nm. The optical parameters were calculated from colour calculator software, and the chromaticity diagram was drawn using CIE software. The TCSPCS was used to compute the lifetime of the excited state, and a haemocompatibility test was performed to ensure that it was biocompatible.