Investigation of thermoluminescence and electron-vibrational interaction parameters in SrAl₂O₄:Eu²⁺, Dy³⁺ phosphors

Combustion synthesis method was employed for the synthesis of green-emitting monoclinic SrAl₂O₄:Eu²⁺, Dy³⁺ phosphors. The phase-purity of the prepared phosphors were examined using X-ray diffraction (XRD). The prepared phosphors exhibited green light emission with the peak centred at 510 nm, under 350 nm UV excitation. The excitation and emission spectra were analysed and the parameters of electron-vibrational interaction (EVI), such as the Huang–Rhys factor, effective phonon energy and zero-phonon line position were estimated using the spectrum fitting method. Thermoluminescence (TL) behaviour of the as-prepared phosphors were analysed for UV and ¹³⁷Cs γ-ray source irradiation. TL glow curves for UV-irradiated SrAl₂O₄:Eu²⁺, Dy³⁺ phosphors were analysed. - Highlights: • Photoluminescence and thermoluminescence properties of SrAl₂O₄:Eu²⁺,Dy³⁺ phosphors were analysed. • Electron-vibrational interaction (EVI) parameters of SrAl₂O₄:Eu²⁺,Dy³⁺ phosphors were determined. • The phosphors are found to exhibit green light emission.