SHI Induced Thermoluminescence Properties Of  sol-gel Derived Y2O3:Er3+ Nanophosphor

¹Department of Physics, Jnanabharathi Campus, Bangalore University, Bangalore 560 056, India

²Department of Physics (S & H), PES University, 100 feet Ring Rd., BSK 3rd Stage, Bangalore 560 085, India

³Inter University Accelerator Centre, P.O. Box No. 10502, New Delhi 110 067, India

Adv. Mater. Lett., 2015, 6 (4), pp 342-347

DOI: 10.5185/amlett.2015.5713

Publication Date (Web): Mar 21, 2015

Copyright © IAAM-VBRI Press

E-mail: bnlnarasappa@rediffmail.com

Abstract

Nanocrystalline erbium doped yttrium oxide (Y₂O₃:Er³⁺) was synthesized by the sol-gel technique using citric acid as complexing agent. The synthesized samples were characterized by X-ray diffraction (XRD), Field emission scanning electron microscope (FE-SEM) techniques for phase-purity and microstructure. Er³⁺ doped Y₂O₃ crystallizes in cubic phase with an average crystallite size of 24.3 nm. The pellets of Y₂O₃:Er³⁺ were irradiated with 100 MeV swift Si⁸⁺ ions with fluence in the range of 3×10¹¹ - 3×10¹³ ions cm^-2.  Three well resolved thermoluminescence (TL) glows with peaks at ~422, 525 and 620 K were observed in Er³⁺ doped Y₂O₃ samples. It was observed that the TL intensity was found to increases with increasing Er³⁺ concentration up to 0.4 mol% in Y₂O₃ and thereafter it decreases with further increase of Er³⁺ concentration. Also, the intensity of low temperature TL glow peak (~422 K) increases with increasing ion fluence up to 1×10¹² ions cm^-2 and decreases with further increase of ion fluences. The TL trap parameters were calculated by glow curve shape method and the deconvoluted glows were exhibit of second order kinetics.

Keywords

Sol-gel synthesis, swift heavy ion, XRD, FE-SEM, thermoluminescence.