Abstract

In this paper, we report the dysprosium-doped strontium magnesium silicate, namely, SrMgSi₂O₆:xDy³⁺ (x = 1.0, 1.5, 2.0, 2.5, and 3.0 mol%) phosphors prepared by the traditional high temperature solid state reaction method. The prepared phosphors were characterized by X-ray diffraction, field emission scanning electron microscope coupled with the energy dispersive X-ray spectroscopy (EDS) and Fourier transform infrared technique. The crystal structures of sintered phosphors were an akermanite type which belongs to the tetragonal crystallography with space group ${\rm{P\bar{42}}}_{{1}}{\rm m}$ . The chemical composition of the sintered phosphor SrMgSi₂O₆:Dy³⁺ (2%) was confirmed by the EDS. Under the ultraviolet excitation, the emission spectra of SrMgSi₂O₆:xDy³⁺ (x = 1.0, 1.5, 2.0, 2.5, and 3.0 mol%) phosphors were composed of broadband with the characteristic emission of Dy³⁺ ions peaking at 475 nm (blue) and 574 nm (yellow), originating from the transitions of $^{4}{\rm{F}}_{{\rm{9/ 2}}}\,\rightarrow \,^{6}{\rm{H}}_{j}$ state (where j = 15/2 and 13/2). The combination of these two emissions constituted white light emission as indicated on the Commission Internationale de l'Eclairage chromaticity diagram. The possible mechanism of the prepared white light emitting SrMgSi₂O₆:xDy³⁺ (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.

© 2016 IEEE

Cool white light emission from Dy³⁺ activated alkaline alumino silicate phosphors

Shweta Sharma, Nameeta Brahme, D. P. Bisen, and Pradeep Dewangan
Opt. Express 26(22) 29495-29508 (2018)

Near-white-emitting phosphors based on tungstate for phosphor-converted light-emitting diodes

A. K. Ambast, A. K. Kunti, S. Som, and S. K. Sharma
Appl. Opt. 52(35) 8424-8431 (2013)

Yellow-emitting γ-Ca₂SiO₄:Ce³⁺, Li⁺ phosphor for solid-state lighting: luminescent properties, electronic structure, and white light-emitting diode application

Ho Seong Jang, Hyun You Kim, Yang-Soo Kim, Hyuck Mo Lee, and Duk Young Jeon
Opt. Express 20(3) 2761-2771 (2012)

Bi²⁺-doped strontium borates for white-light-emitting diodes

Mingying Peng and Lothar Wondraczek
Opt. Lett. 34(19) 2885-2887 (2009)

Structure characteristics and afterglow of BaZr₄(PO₄)₆ phosphor

Ruijin Yu, Maosen Yuan, Yonghua Xiong, Junbo Li, and Jinyi Wang
Opt. Mater. Express 6(4) 1049-1055 (2016)