Loc, L.T., Tien, T.T.T., Phat, L.T., Vy, N.T.Y., Phong, T.V.H., Chi, N.T.K. and Tien, D.M. 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.