Synthesis, Structural, and Photoluminescence Studies of Tb³⁺ Activated Y₂SiO₅ Phosphor for Display Devices

The synthesis and luminescence analysis of Tb³⁺-activated phosphors were reported. Y₂SiO₅ phosphors were synthesized by a modified solid-state reaction method with a variable doping concentration of Tb³⁺ ion (0.5–2.5 mol.%). As synthesized, the phosphors were characterized by X-ray diffraction (XRD) analysis. The XRD pattern confirmed the monoclinic structure of the prepared phosphor. Scanning electron microscopy and High-Resolution Transmission Electron Microscopy (HRTEM) studies revealed nearly uniform particle size distribution in the prepared phosphors. The photoluminescence excitation spectra of the Y₂SiO₅:Tb³⁺ (0.5–2.5 mol.%) phosphor displayed one broad, intense peak at 258–277 nm. When excited at the 258 nm wavelength, the phosphors showed emission peaks at 553 nm (⁵D₄ → ⁷F₅), 544 nm (⁵D₄ → ⁷F₅) and 489 nm (⁵D₄ → ⁷F₆). The 1931 CIE (x,y) chromaticity coordinates showed the distribution of the spectral region calculated from the photoluminescence emission spectra. The values of x = 0.25 and y = 0.46 were very close to light green emission. Therefore, the prepared phosphor is very useful for light-emitting diode (green component) applications.