Abstract
Manganese doped zinc silicate (Zn2SiO4:Mn) is a kind of phosphor materials that has a photoluminescent (PL) (at 520 nm) and cathode-luminescent (CL) properties with relative high intensity green light emission. In this study, six methods were tried to synthesis Zn2SiO4 powder. Two (ZSpII and ZSpVI) methods have the best performance. The colloidal particle consisted of SiO2 core-Zn2SiO4:Mn shell has been synthesized via colloidal process and forced precipitation. The reactants Zn/Mn ions were coated on the SiO2 particles. After drying and calcination, the Zn/Mn precipitates reacted with SiO2, then transformed to Zn2SiO4 phase. The behavior of Zn/Mn ions precipitation on silica spheres were studied by ICP-AES. The morphology of core-shell structure was investigated by electron microscopy. The phase identification was studied by X-ray diffraction. The PL and CL properties were determined by photon spectrometer. The results showed that with the increase of annealing temperature, the precipitates formed ZnO first, then reacted with SiO2 and transformed to Zn2SiO4 phase. Finally, SiO2 template with PBG structure coated by ZnSiO4:Mn shell was obtained. Besides, Zn2SiO4 powders as a paste coated on transparent electrode for assembling a CL device. The performance of the device was characterized as well.
Published Version
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