Abstract
SnO2·H2O phosphor was synthesized by chemically etching metallic tin in aqueous HNO3 solution. The optical properties of the synthesized phosphor were investigated by diffuse reflectance measurement, photoluminescence (PL) analysis, and PL excitation (PLE) spectroscopy. SnO2·H2O phosphor exhibited red (R) and green (G) emission bands with peaks at ∼600 and ∼500 nm, respectively. The PL spectra showed a clear dependence not only on lattice temperature but also on excitation light wavelength and power. The R emission band showed a single excitation peak at ∼4 eV, while the PLE spectrum of the G emission band exhibited three main peaks at ∼3.9, ∼4.5, and ∼5.4 eV. Such PL properties were interpreted considering electron transfer at excited states and using the configurational-coordinate model. The PL properties of SnO2·H2O phosphor were also discussed in comparison with those of SnO2 nanomaterials.
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