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

• Published in: Journal of materials science. Materials in electronics Vol. 24; no. 12; pp. 4774 - 4781
• Main Authors: Krishnan, R., Thirumalai, J., Shameem Banu, I. B., Chandramohan, R.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.12.2013; Springer
• Subjects: Applied sciences; Characterization and Evaluation of Materials; Chemistry and Materials Science; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Electronics; Exact sciences and technology; Materials; Materials Science; Nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals; Optical and Electronic Materials; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Photoluminescence; Physics; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Scheelite; Inversion Symmetry; Molybdenum Trioxide; Doping Concentration; Luminous Efficacy; Scanning electron microscopy; Impurity density; Diffuse reflection; Photoluminescence; Red light; Doped materials; Luminescent material; Dispersive spectrometry; Luminescence decay; Energy gap; Ultraviolet radiation; Decay time; Morphology; Solid state reaction; Concentration effect; Illumination; X ray diffractometry; Microstructure; Indium addition; X-ray photoelectron spectra; Crystalline structure
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-013-1473-y

Intense red-emitting phosphor Na 0.5 La 0.5−x MoO 4 :xEu 3+ (x = 0.02, 0.04, 0.06, 0.08, 0.10 mol of Eu 3+ ) 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 Na 0.5 La 0.5−x MoO 4 :xEu 3+ showing a significant shift in the band gap (0.14 eV) was observed due to increase in doping concentration of Eu 3+ . Photoluminescence and decay time (τ) study on Na 0.5 La 0.5−x MoO 4 :xEu 3+ showed strong red emission upon UV illumination, and this implied potential application in the field of luminescent displays.