Abstract
The present study reports the synthesis, crystallographic structure and optical properties of manganese (Mn2+) doped zinc silicate (Zn2SiO4) nanoparticle phosphors prepared by sol–gel and combustion methods. For samples prepared by sol–gel method, the X-ray diffraction results showed phase transformation from amorphous to α-phase Zn2SiO4 due to annealing temperatures at 600°C to 1100°C, whereas for combustion samples an admixture of highly crystalline β-phase and hexagonal wurtzite structure of ZnO was observed at annealing temperature of 600°C. Photoluminescence spectra with Mn2+ concentrations ranging from 0.015–0.09mol% were compared for two methods. Emission band assigned to the 4T1(4G)→6A1(6S) electronic transition of Mn2+ was observed with maximum intensity at ~573nm for combustion samples and ~532nm for sol–gel samples upon UV-excitation by a Xenon lamp. Furthermore, the photoluminescence decay curves of annealed Zn2SiO4:Mn2+ samples were observed to be bi-exponential. The fast and slow decay components are due to the pair or cluster formation and isolated ions at higher doping concentration, respectively.
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