Luminescent properties of R+ doped Sr2MgSi2O7:Eu3+ (R+ = Li+, Na+ and K+) orange–red emitting phosphors

Abstract

Sr2MgSi2O7:Eu3+ and Sr2MgSi2O7:Eu3+, R+ (R+ = Li+, Na+ and K+) phosphors were prepared by conventional solid state reaction method. The crystal structures of synthesized phosphors were an akermanite type structure which belongs to the tetragonal crystallography. The thermoluminescence kinetic parameters such as activation energy, order of kinetics and frequency factor was calculated by peak shape method. In this work, the orange-red emission originated from the 5D0–7FJ (J = 0, 1, 2, 3, 4) transitions of Eu3+ ions could clearly be observed after samples were excited at 395 nm. Decay graph indicate that these phosphors also contain the fast and slow decay process. Mechanoluminescence intensity of prepared Sr2MgSi2O7:Eu3+ and Sr2MgSi2O7:Eu3+, R+ (R+ = Li+, Na+ and K+) phosphors were increases linearly with the increasing impact velocity of moving piston (load). CIE color chromaticity diagram confirm that the prepared phosphors would emit orange-red color. Thus the present investigation indicating that this phosphor may be a potential candidate for stress sensors. The dopant R+ (R+ = Li+, Na+ and K+) as charge compensator in Sr2MgSi2O7:Eu3+ can further enhance luminescence intensity, and the emission intensity of Sr2MgSi2O7:Eu3+ doping Li+ is higher than that of Na+ or K+.