Emission analysis of RE3+ (RE=Eu, Sm, Dy):MgY4Si3O13 phosphors

Abstract

A series of Eu3+, Sm3+, and Dy3+ ion doped magnesium yttrium silicate [MgY4Si3O13] phosphors was synthesized using the solid-state reaction method with a grain size of approximately 500 nm in hexagonal symmetry. The photoluminescence (PL) spectra of the Eu3+, Sm3+, and Dy3+:MgY4Si3O13 phosphors exhibit bright red, orange-red and yellow emissions at 615 nm (D-5(0) -> F-7(2)), 603 nm ((4)G(52) -> H-6(7/2)), and 574 nm (F-4(9/2) -> H-6(13/2)), respectively. The thermoluminescence (TL) of the phosphors displays the maximum intensity consistently at 10 mol% of the ion concentrations, with a single glow peak around 165 degrees C (Eu3+ -activated phosphor), 230 degrees C (Sm3+ -activated phosphor), and 230 degrees C (Dy3+ -activated phosphor), respectively. The trap parameters such as the order of kinetics (b), activation energy (E), frequency factor (S), and Balarin parameter (gamma) associated with the most intensive glow peak of these phosphors were finally determined by analyzing their line-shapes on the basis of Chen's method. (C) 2015 Elsevier B.V. All rights reserved.