Luminescence and electron paramagnetic resonance investigation on ultraviolet emitting Gd doped MgAl2O4 phosphors

• Published in: Journal of luminescence 2013-11, Vol.143, p.162-168
• Main Authors: Singh, Vijay, Sivaramaiah, G., Rao, J.L., Kim, S.H.
• Format: Article
• Language: English
• Subjects: Combustion; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Diffraction; Electron paramagnetic resonance; Electron paramagnetic resonance and relaxation; EPR; Exact sciences and technology; Gd3+ ions; Luminescence; Magnetic properties and materials; Magnetic resonances and relaxations in condensed matter, mössbauer effect; Magnetically ordered materials: other intrinsic properties; Materials science; Materials synthesis; materials processing; MgAl2O4; Phosphors; Photoluminescence; Physical radiation effects, radiation damage; Physics; Saturation moments and magnetic susceptibilities; Scanning electron microscopy; Structure of solids and liquids; crystallography; Ultraviolet; Ultraviolet, visible, and infrared radiation effects (including laser radiation); X-rays; XRD
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2013.03.054

Phosphor powders of Gd doped MgAl2O4 have been prepared by a simple combustion route in a short time of 5min. Powder X-ray diffraction, scanning electron microscope and energy dispersive analysis of X-ray techniques were used to characterize the as-prepared combustion product. The luminescence of Gd3+ doped MgAl2O4 shows two emission bands centered at 306nm (6P5/2→8S7/2) and 312nm (6P7/2→8S7/2), under UV light excitation (273nm). Electron Paramagnetic Resonance (EPR) spectra reveal the U spectrum which is typical for Gd3+ ions disposed in tetrahedral, octahedral or cubic symmetry with moderate distortion. The number of spins, Gibbs energy, magnetic susceptibility, Curie constant and effective magnetic moment values are determined at 110 and 296K. The linewidth is found to increase with the decrease of temperature and this has been attributed to spin–spin interaction. •Ultraviolet emitting Gd doped MgAl2O4 phosphor was prepared by simple combustion route in 5min.•EPR analysis of the sample confirms the presence of Gd3+ in the MgAl2O4 matrix.•The intense peak was observed at 312nm (6P7/2→8S7/2) due to the presence of Gd3+ ions.