Sol–gel fabricated Dy3+-activated CaS phosphors: a view on photoluminescence, structural, morphological, lifetime, and in vitro analysisV. Kavitha, M. Prema Rani, D. Sivaganesh and K. VigneshEur. Phys. J. Plus, 138 9 (2023) 853DOI: https://doi.org/10.1140/epjp/s13360-023-04492-2