Luminescence and EPR studies of Y2O3:Gd3+ phosphors prepared via solution combustion method

Luminescence and EPR studies of Y2O3:Gd3+ phosphors prepared via solution combustion method: "

Abstract

Gadolinium-activated Y₂O₃ phosphor has been prepared by combustion process in a short time of 5 min. The phosphors are well characterized by X-ray
diffraction, scanning electron microscopy, and energy-dispersive analysis of X-ray. The as-prepared Y₂O₃:Gd powder shows that all the peaks are due to the Y₂O₃ cubic phase. Upon UV light excitation (276 nm), the phosphor exhibits a strong and sharp UV emission at 314 nm and is ascribed
to

6 \textP 7/ 2 ® 8 \textS 7/ 2

transition of Gd³⁺ ions. The EPR spectrum of Y₂O₃:Gd phosphor exhibits resonance signals with effective g values at g = 1.96, g = 2.88, and g = 6.08 and are attributed to Gd³⁺ ions located at sites with weak, intermediate, and strong cubic symmetry fields, respectively. It is observed that the population
of spin levels (N) and linewidth depends on temperature. The paramagnetic susceptibility (χ) is also evaluated as a function
of temperature and discussed.

• Content Type Journal Article
• DOI 10.1007/s10853-010-4869-6
• Authors
  
  • Vijay Singh, Mechanical Engineering Department, Chung-Ang University, Seoul, 156-756 Korea
  • R. P. S. Chakradhar, Glass Technology Laboratory, Central Glass and Ceramic Research Institute, CSIR, Kolkata, 700032 India
  • J. L. Rao, Department of Physics, Sri Venkateswara University, Tirupati, 517-502 India
  • Isabelle Ledoux-Rak, Laboratoire de Photonique Quantique et Moleculaire, Institut d’Alembert, Ecole Normale Superieure de Cachan, 61 av. du President Wilson, 94-235 Cachan, France
  • Ho-Young Kwak, Mechanical Engineering Department, Chung-Ang University, Seoul, 156-756 Korea

• Journal Journal of Materials Science
• Online ISSN 1573-4803
• Print ISSN 0022-2461

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