Title: Photoluminescence characterisation of Zn_1–xCd_xAl₂O₄:Eu nanophosphor for solid state lighting

Authors: M.S.K. Khokhar, Abhay D. Deshmukh, D.R. Peshwe, S.J. Dhoble, R.S. Kher

Addresses: Department of Rural Technology, Guru Ghasidas University, Bilaspur 495 009, India. ' Department of Metallurgical and Materials Engineering, VNIT, Nagpur-440 011, India. ' Department of Metallurgical and Materials Engineering, VNIT, Nagpur-440 011, India. ' Kamla Nehru College, Sakkardara Square, Nagpur-440 009, India. ' Department of Physics, Government Science P.G. College, Bilaspur 495 006, India

Abstract: All the phosphor are prepared as Zn_1-x-yCd_xAl₂O₄:Eu_y by combustion method. The formation of crystalline aluminates was confirmed by X-ray diffraction. The prepared phosphor was characterised by SEM, EDS, particle size analyser and photoluminescence (PL) techniques. The PL emission spectra of Zn_1-x-yCd_xAl₂O₄:Eu_y phosphor shows prominent peaks at 613 nm and 580 nm (excited by 394 nm wavelengths). It is also observed that the Eu ions are incorporated in trivalent form. The Eu ion concentration is kept constant at 0.5 mol% and Cd concentration varies from 0.1 mol% to 1 mol% in the host lattice. The increase in concentration of Cd ions increases the PL emission intensity. So it is clear that the replacement of Zn ion into Cd ions increased the crystallinity, hence, increases the PL intensity. The SEM and particle size analyser results indicate that the prepared phosphor are in nanosize and increase in concentration of Cd ions increases the particle size of phosphor.

Keywords: photoluminescence; nanomaterialS; lamp phosphor; solid state lighting; nanotechnology; zinc ions; cadmium ions; nanoparticles.

DOI: 10.1504/IJNP.2009.028739

International Journal of Nanoparticles, 2009 Vol.2 No.1/2/3/4/5/6, pp.74-80

Published online: 30 Sep 2009 *

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