Abstract
A low-temperature molten salt method has been used to synthesis Zn2SiO4:Mn (ZSM) powders in NaCl–ZnCl2 eutectic salts by using calcined SBA-15 as silica source without any post-treatment. Characterizations of the samples were carried out by X-ray diffraction, high resolution selection electron microscopy, Raman Spectroscopy and Photoluminescence. Our study revealed that the well crystalline ZSM was obtained at 450°C, much lower than the conventional solid-state reaction temperature but also get better crystallinity when the temperature increased to 500°C. The SEM micrographs of ZSM are comprised of irregular rod-like structure with different length–diameter ratio, which showed the average length is about 1μm and the average diameter is around 100nm. Besides, the UV excitation spectra showed that the ZSM phosphor exhibited a strong green emission around 527nm and reached the highest luminescence intensity with the Mn doping concentration of 0.2. In addition, the luminescence decay time of Zn1.8Mn0.2SiO4 (x=0.2) around 527nm lasted for 14.25ms upon 245nm excitation.
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