Tính chất quang của vật liệu Sr2TiO4 pha tạp ion Eu3+ chế tạo bằng phương pháp phản ứng pha rắn

Abstract

Fluorescent powder Sr₂TiO₄ doped with Eu³⁺ ions was synthesised by the solid-phase reaction method with a sintering temperature of 1200^oC in the air with a 1-6% doping concentration. The resulting material has a perovskite structure of I4/mmm space group, and the Eu³⁺ ion doping concentration does not change the material’s structure. This characteristic space group of the material was also investigated through the Raman scattering spectrum with characteristic peaks at positions 145, 240, 448, and 699 cm^-1 corresponding to vibrational modes with 2A_1g + 2E_g characteristic states of Sr₂TiO₄ material. The results showed that the material absorbs strongly in the ultraviolet and blue light regions with characteristic peaks of the Sr₂TiO₄ matrix and Eu³⁺ ions to emit strongly in the red light region with characteristic emission peaks of Eu³⁺ ions in the background network when moving from the excited state ⁵D₀ to state ⁷F_j (j is a positive integer number). Fluorescence quenching was also observed at a doping concentration of 4% Eu³⁺ ions. The fabricated material is suitable for coating applications on nUV-LED LED chips.