Abstract
In this work, we report the preparation, characterization, comparison and luminescence mechanisms of Eu2+ -doped and Eu2+ ,Dy3+ -co-doped Ba2 MgSi2 O7 (BMSO) phosphors. Prepared phosphors were synthesized via a high temperature solid-state reaction method. All prepared phosphors appeared white. The phase structure, particle size, and elemental analysis were analyzed using X-ray diffraction (XRD), transmission electron microscopy (TEM) and energy-dispersive X-ray (EDX) analysis. The luminescence properties of the phosphors were investigated by thermoluminescence (TL) and photoluminescence (PL). The PL excitation and emission spectra of Ba2 MgSi2 O7 :Eu2+ showed the peak to be around 381nm and 490nm respectively. The PL excitation spectrum of Ba2 MgSi2 O7 :Eu2+ Dy3+ showed the peak to be around 341nm and 388nm, and the emission spectrum had a broad band around 488nm. These emissions originated from the 4f6 5d1 to 4f7 transition of Eu2+ . TL analysis revealed that the maximum TL intensity was found at 5mol% of Eu2+ doping in Ba2 MgSi2 O7 phosphors after 15min of ultraviolet (UV) light exposure. TL intensity was increased when Dy3+ ions were co-doped in Ba2 MgSi2 O7 :Eu2+ and maximum TL intensity was observed for 2mol% of Dy3+ . TL emission spectra of Ba1.95 MgSi2 O7 :0.05Eu2+ and Ba1.93 MgSi2 O7 :0.05Eu2+ ,0.02Dy3+ phosphors were found at 500nm. TL intensity increased with UV exposure time up to 15min, then decreased for the higher UV radiation dose for both Eu doping and Eu,Dy co-doping. The trap depths were calculated to be 0.54eV for Ba1.95 MgSi2 O7 :0.05Eu2+ and 0.54eV and 0.75eV for Ba1.93 MgSi2 O7 :0.05Eu2+ ,0.02Dy3+ phosphors. It was observed that co-doping with small amounts of Dy3+ enhanced the thermoluminescence properties of Ba2 MgSi2 O7 phosphor. Copyright © 2016 John Wiley & Sons, Ltd. [Correction added on 5 April 2016, after first online publication: The following parts of the abstract have been edited for consistency. '4f65d1' has been corrected to '4f6 5d1 ', '4f7' has been corrected to '4f7 ', 'Ba1.95' has been corrected to 'Ba1.95 ' and 'Ba1.93' has been corrected to 'Ba1.93 ' respectively.].
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