Ion Induced Modification Of Structural And Photoluminescence Properties Of  Y2O3:Eu3+/ Tb3+ Nanophosphors: A Comprative Study

¹Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan

²Department of Applied Physics, Indian School of Mines, Dhanbad 826004, India

³Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan

⁴Department of Physics, S.G.R.P.G. College, Dobhi, Purvanchal University, Jaunpur 222148, India

⁵Inter University Accelerator Centre, New Delhi 110067, India

Adv. Mater. Lett., 2015, 6 (8), pp 673-677

DOI: 10.5185/amlett.2015.5927

Publication Date (Web): Aug 02, 2015

Copyright © IAAM-VBRI Press

E-mail: physubrata@yahoo.co.in, sksharma.ism@gmail.com

Abstract

Herein, a comparative study on the structural and luminescence properties of optimized Y₂O₃:Eu³⁺/Tb³⁺ nanophosphor has been reported after 150 MeV Ni⁷⁺, 120 MeV Ag⁹⁺and 110 MeV Au⁸⁺ ion beam irradiation at various fluences ranging from 1×10¹¹ to 1×10¹³ ions/cm². The X-ray diffraction results confirm the cubic phase in case of unirradiatedY²O³:Eu³⁺/Tb³⁺ nanophosphor. The loss of crystallinity was observed after ion irradiation and Au ion is more effective to damage the crystal structure in these phosphors. The transmission electron microscopic results show the reduction of the particle size from 100 nm to 50, 30 and 20 nm after ion irradiation with the Ni⁷⁺, Ag⁹⁺ and Au⁸⁺ ions, respectively. Diffuse reflectance spectra show a blue shift in the absorption band owing to the increase in the band gap after ion irradiation. An increase in the photoluminescence intensity without any shift in the peak positions was observed with the increase in the ion fluence. The colour tunability was observed with ion irradiation as the colour coordinate varies from red to white chromaticity.

Keywords

Nanophosphor, swift heavy ion, band gap, colour tunability.