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IJEMS Vol.19(3) [June 2012] >


Title: Effect of crystallite size on electron spin resonance of Gd3+ and luminescence of Eu3+ doped in La6WO12
Authors: Devi, V Rama
Kumar, B Vijaya
Velchuri, Radha
Suresh, Palla
Ravi, G
Vithal, M
Keywords: Sol-gel
Powder XRD
Crystallite size
Luminescence
ESR
Issue Date: Jun-2012
Publisher: NISCAIR-CSIR, India
Abstract: Nano-sized Eu3+ and Gd3+ doped lanthanum tungstates of composition La6-xLnxWO12 (Ln = Eu, Gd; 0 ≤ x ≤ 0.2) are prepared by sol-gel complexation method. These samples are characterized by powder X-ray diffraction (XRD). The average crystallite size is calculated from the XRD using Scherer’s equation. The electron spin resonance (ESR) spectrum of Gd3+ doped lanthanum tungstate (La6WO12) gives characteristic “U” type spectrum. The luminescence spectrum of Eu3+ doped La6WO12 gives characteristic 5D07Fn (n = 0 to 4) bands due to trivalent europium ions. The intensity of 5D07F2 transition decreases with increase in the sintering temperature due to depletion of surface Eu3+ ions. The intensity of 5D07F2 sintered at 700°C has highest intensity and may have laser applications.
Page(s): 204-208
CC License:  CC Attribution-Noncommercial-No Derivative Works 2.5 India
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Source:IJEMS Vol.19(3) [June 2012]

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