<p>A nanocrystalline phosphor, Sr_0.97Al₂O₄: Eu²⁺_x, Dy³⁺_y (with x = 1&#xa0;mol% and y = 2&#xa0;mol%), was synthesized by the combustion synthesis technique (CST). Subsequently, this synthesized nanophosphor was deposited as thin films with varying deposition times (3, 7, 11, 15, 19, and 23&#xa0;min) through the electron-beam evaporation deposition method (EBEDM) at a temperature of 250&#xa0;°C. Energy-dispersive X-ray spectroscopy (EDS) confirmed the presence of constituent elements in the as-synthesized phosphor. The crystalline nature of these thin films was analysed using X-ray diffractograms (XRD). Morphological and optical characteristics were investigated through field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), diffuse reflectance spectroscopy (DRS), photoluminescence (PL) assessments, afterglow (AG) measurements, electroluminescence (EL) studies, luminance-voltage (L-V) measurements, and current–voltage (C-V) measurements. The results indicated that the thin film deposited for 11&#xa0;min exhibited the most optimized morphological and optical properties, making it an ideal candidate for the fabrication of alternating current thin film electroluminescence devices (ACTFEL) with enhanced efficiency. The wide energy band-gap of these deposited thin films was confirmed through DRS spectra and corresponding Tauc's plot. PL studies further supported these findings, showing that the emission spectrum of the 11-min-deposited thin film was the most intense, with a broad band centered at 514&#xa0;nm, indicative of the 4f⁶5d¹—4f⁷ transitions of Eu²⁺. Notably, this emission spectrum remained consistent across different deposition times, highlighting its stability and suitability for applications in optoelectronic devices.</p>