Abstract
The green emitting phosphor based on manganese activated zinc silicate was successfully synthesized by the sol - gel method. This paper reports the synthesis and investigation of how the annealing temperature and concentration affect the photoluminescence properties of the Mn2+ ions in Zn2SiO4 crystals. The paper also discusses the effect of alkaline ions on the luminous intensity of obtained Zn2SiO4 phosphor. The luminescence intensity is strongly dependent on the manganese doping concentrations; the optimal doping concentration is 1 mol% and the product when calcining the obtained gel at 1100 oC for 60 minutes has highest luminescence intensity. Alkali metal ions added to the composition of raw materials show the effect of enhancing the luminescence intensity of Zn2SiO4:Mn. Samples after the addition of potassium have the highest luminescence intensity; the luminescence intensity has increased by 30% compared to that of the original sample. The synthesized phosphor consists of Zn2SiO4 with rhombohedral structure and emits a green light at the 525 nm wavelength when excited by the 325 nm UV radiation.
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