1551-319X (c) 2016 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission. See http://www.ieee.org/publications_standards/publications/rights/index.html for more information. This article has been accepted for publication in a future issue of this journal, but has not been fully edited. Content may change prior to final publication. Citation information: DOI 10.1109/JDT.2016.2608382, Journal of Display Technology Page | 1 Dysprosium Doped Strontium Magnesium Silicate White light Emitting Phosphor Prepared by Solid State Reaction Method a Ishwar Prasad Sahu,* a D. P. Bisen, b Raunak Kumar Tamrakar a School of Studies in Physics & Astrophysics, Pt. Ravishankar Shukla University, Raipur (C.G.) Pin Code - 492010, India b Department of Applied Physics, Bhilai Institute of Technology, Durg (C.G.) Pin Code - 491001, India Corresponding author Email Id: ishwarprasad1986@gmail.com* Abstract In this article, we report the dysprosium doped strontium magnesium silicate namely SrMgSi 2 O 6 :xDy 3+ (x = 1.0, 1.5, 2.0, 2.5 and 3.0 mol%) phosphors prepared by traditional high temperature solid state reaction method. The prepared phosphors were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) coupled with the energy dispersive X-ray spectroscopy (EDS) and fourier transform infrared (FTIR) technique. The crystal structures of sintered phosphors were an akermanite type which belongs to the tetragonal crystallography with space group P 4̅2 1 m. The chemical composition of the sintered phosphor SrMgSi 2 O 6 :Dy 3+ (2%) was confirmed by the EDS. Under the ultraviolet excitation, the emission spectra of SrMgSi 2 O 6 :xDy 3+ (x = 1.0, 1.5, 2.0, 2.5 and 3.0 mol%) phosphors were composed of broad band with the characteristic emission of Dy 3+ ions were peaking at 475 nm (blue) and 574 nm (yellow), originating from the transitions of 4 F 9/2 → 6 H j state (where j = 15/2, 13/2). The combination of these two emissions constituted white light emission as indicated on the Commission Internationale de l'Eclairage (CIE) chromaticity diagram. The possible mechanism of the prepared white light emitting SrMgSi 2 O 6 :xDy 3+ (x = 1.0, 1.5, 2.0, 2.5 and 3.0 mol%) phosphors were also investigated. Investigation on decay property show that the prepared phosphor held fast and slow decay process. In order to investigate the suitability of the samples as white color light sources for industrial uses, correlated color temperature (CCT) and color rendering index (CRI) were calculated. Values of CCT and CRI were found, well within the defined acceptable range. Keywords: Thermoluminescence; Long afterglow Phosphors; CIE; CCT; CRI.