Thang, Cao Xuan, Le Thanh Cuong, Nguyen Minh Tu, Vu Tuan Anh, & Hoang Nhu Van. " Effect of Fuel Contents on Upconversion Emission Properties of Rare-Earth Ions Doped Hydroxyapatite/Tri-Calcium Composite Phosphors." VNU Journal of Science: Mathematics - Physics [Online], (0): n. pag. Web. 17 Oct. 2026