Influence of Eu3+ ions in Na0.5La0.5MoO4: structural and optical investigation

Intense red-emitting phosphor Na0.5La0.5−xMoO4:xEu3+ (x = 0.02, 0.04, 0.06, 0.08, 0.10 mol of Eu3+) was prepared at 900 °C for 3 h using conventional solid-state reaction method. Crystal structure and phase purity of the phosphor were identified using X-ray diffraction analysis. The morphology and composition of the materials were examined by scanning electron microscope, energy dispersive X-ray spectrum, and X-ray photoelectron spectroscopy, respectively. The diffuse reflectance spectra of Na0.5La0.5−xMoO4:xEu3+ showing a significant shift in the band gap (0.14 eV) was observed due to increase in doping concentration of Eu3+. Photoluminescence and decay time (τ) study on Na0.5La0.5−xMoO4:xEu3+ showed strong red emission upon UV illumination, and this implied potential application in the field of luminescent displays.