Abstract
Manganese doped zinc silicate (Zn1.89SiO4:Mn0.11) green and yellow nanophosphors were prepared by solution combustion method using fumed silica and tetraethyl ortho silicate (TEOS) as sources of silica. The phosphors are calcined at 950 °C for 3 h. The formation of α and β- Zn2SiO4:Mn2+phases of the samples were confirmed by powder XRD measurements. The morphology and composition of the samples are investigated by SEM, TEM, FTIR and EDAX. FTIR shows that the main absorption bands located in the frequency region between 400 and 1200 cm−1. The effects of different sources of silica on the photoluminescence (PL) properties of Zn2SiO4:Mn2+ were studied. Among the silica sources, TEOS gave green and yellow emission at 527 and 581 nm, on excitation at 262 and 292 nm respectively. Fumed silica source gave only green emission at 527 nm on excitation at 262 nm. The emissions are originated from the 4T1 to 6A1 transitions of Mn2+ ions. Luminescence decay curve measurement show double exponential decay behavior and fast decay time has been observed.
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