Abstract
The luminescence properties of Eu2+ and Mn2+ co-activated (Ba,Ca,Sr)3MgSi2O8 phosphors prepared by combustion synthesis were studied. Eu2+-activated (Ba,Ca,Sr)3MgSi2O8 has a broad blue emission band centered at 450–485nm and Eu2+–Mn2+-activated (Ba,Ca,Sr)3MgSi2O8 exhibits a red emission around 620–703nm, depending on the relative concentrations of Ba, Ca and Sr. The particle size of Eu2+ and Mn2+ co-activated (Ba,Ca)3MgSi2O8 ranges from 300nm to 1μm depending on the metal ion and are agglomerated due to post-synthesis, high temperature annealing. The green emission of Ba3MgSi2O8 originates from secondary phases (Ba2SiO4 and BaMgSiO4) confirmed by emission spectra and X-ray diffraction patterns. The secondary phases of Ba3MgSi2O8 are removed by the addition of Sr. The quantum efficiencies range from 45% to 70% under 400nm excitation and the lifetime of red emission of Ba3MgSi2O8 decreases significantly with increasing temperature, which is 54% at 400K of that at 80K compared to that of blue emission (90% at 400K of that at 80K).
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