Structural characterization and luminescence properties of Dy3+ doped Ca3MgSi2O8 phosphors

Different concentrations of Dy³⁺ doped Ca₃MgSi₂O₈ phosphors were synthesis by solid state reaction method. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermoluminescence (TL) and photoluminescence (PL) were carried out. The absorption band located at 351 nm is a main excitation peak matching with the emission of near white light emitting diodes ultraviolet light (400–700 nm). The emission spectra consist mainly group of three emission bands, which are situated around 482 nm, 493 nm (both correspond to blue emission) and 574 nm (correspond to yellow emission). These bands can be assigned to the transitions ⁴F_9/2 → ⁶H_15/2 and ⁴F_9/2 → ⁶H_13/2, respectively. The concentration quenching effect for Dy³⁺ was found at the optimum doping concentration of 2.0 mol %. The thermoluminescence results show that the corresponding increase or decrease in afterglow is associated with trap density, but no change in trap depth. The underlying reason of photoluminescence and afterglow property is discussed. The prepared phosphor may be useful for eco-friendly lighting technology.