Synthesis and Photoluminescence Properties of SnO2 Nanopowder

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概要

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• SnO2 nanopowder was synthesized by calcining metastannic salt (SnO2\CdotH2O) prepared by chemically etching metallic Sn in aqueous HNO3 solution. The calcined SnO2 nanopowder was investigated by X-ray diffraction (XRD) measurement and photoluminescence (PL) spectroscopy. The XRD and PL intensities increased with increasing calcining temperature, yielding an activation energy of {\sim}0.65 eV. The PL spectra of the calcined SnO2 nanopowder exhibited green (G) and red (R) emission bands with peaks at {\sim}2.5 and {\sim}2.0 eV, respectively, that were clearly dependent not only on the excitation light wavelength but also on the sample temperature. The temperature dependence of the PL intensity between 20 and 300 K was explained by the thermal quenching with activation energies of {\sim}15 meV (T=20{\mbox{--}}60 K) and {\sim}0.12--0.18 eV (T \geq 100 K). The G and R emission states were found to originate from the Jahn--Teller effect of the 5s2 (Sn2+) ions in the SnO2 matrix and were similar to those generally observed in many ns2-doped alkali halides and SnCl2.

• 2012-10-25

著者

• Arai Takahiro

  Graduate School of Engineering, Gunma University, Kiryu, Gunma 376-8515, Japan

• Adachi Sadao

  Graduate School of Engineering, Gunma University, Kiryu, Gunma 376-8515, Japan

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• Synthesis and Photoluminescence Properties of SnO2 Nanopowder

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