Ly, T.L., Tran, T.T.T., Lam, T.P., Nguyen, T.Y.V., To, V.H.P., Nguyen, T.K.C. and Dinh, M.T. 2026. Investigation of optical properties of Mn4+ doped ZnAl2O4 phosphor fabricated by sol-gel method. CTU Journal of Innovation and Sustainable Development. 18, 1 (Mar. 2026), 144-155. DOI:https://doi.org/10.22144/ctujoisd.2026.015.