Luminescence investigation of CaY₂ Al₄ SiO₁₂ :Dy³⁺ phosphor synthesized by sol-gel method

Dy³⁺ -doped CaY₂ Al₄ SiO₁₂ phosphors were prepared using the sol-gel method. X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and energy dispersive spectroscopy analyses (EDS) were used to analyse the crystal structure, morphology, and elemental composition of the prepared samples. The luminescence behaviour of the sample was investigated using photoluminescence (PL) and thermoluminescence (TL) techniques. The prepared CaY₂ Al₄ SiO₁₂ :xDy³⁺ phosphor showed a characteristic blue and yellow emission at ~480 and 583 nm, respectively, with an excitation wavelength of 350 nm. The most intense PL emission was found for a 4 mol% doping concentration of Dy³⁺ ions. The CIE diagram of the phosphor showed bluish-white colour emission. For TL studies, the prepared phosphors were irradiated with a ⁶⁰ Co γ (gamma) source and the TL glow curve of the CaY₂ Al₄ SiO₁₂ :0.04Dy³⁺ phosphor showed three overlapped peaks. For the Gaussian peaks, Chen's peak shape method was applied to determine the kinetic parameters of the samples.