Precipitation based synthesis and luminescence of Ln3+ (Eu, Ce, Dy, Sm, Tb) activated BaCa2Si3O9-Walstromite cyclosilicate phosphors

A series of new phosphors of BaCa2Si3O9:Ln3+, (Ln = Eu, Ce, Dy, Sm, Tb) were synthesized by precipitation based method. Good crystallinity was achieved after annealing the sample at 750 °C for 1 h in air. X-ray powder diffraction (XRD) result confirmed the formation of desired BaCa2Si3O9 host. The photoluminescent excitation and emission properties of Ln3+, (Ln = Eu, Ce, Dy, Sm, Tb) activated BaCa2Si3O9 were investigated in detail. The photoluminescence (PL) analysis of individual Ln3+, (Ln = Eu, Ce, Dy, Sm, Tb) activated BaCa2Si3O9 phosphors exhibits interesting characteristic emission properties in their respective regions. From the measured emission spectra, Judd-Ofelt (J-O) intensity parameters (Ω2, Ω4, Ω6) have been calculated and using these J-O parameters various radiative parameters such as radiative transition probabilities (Arad), radiative lifetimes (τR), branching ratios (βR) and relative quantum yield have been calculated for the studied ions.