Preparation and photoluminescence of Dy³⁺-doped Y₃Al₅O₁₂ powder

In this paper, a series of Dy³⁺:Y₃Al₅O₁₂ luminescent materials with different concentrations were successfully synthesized by the sol-gel combustion method. The dependence of the host's crystal structure and charge-to-radius of Re³⁺ (Z/r) on the intensity of emission of Dy³⁺ have been investigated. The results obtained indicate that the strongest excitation peak is at 353 nm corresponding to the ⁶H_15/2→⁶P_7/2 transition of Dy³⁺. In crystalline YAG, the Dy³⁺ ions occupy the Y³⁺ sites whose point symmetry is D₂ with an inversion center, so the maximum emission peak is 481 nm (blue luminescence). The yellow-to-blue intensity ratio (Y/B) depended on the concentration of Dy³⁺ lessly.