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Visible-light excited strong red emission of SnO2 nanostructures

SnO2 nanowires (NWs), SnO2@SnO2 and SnO2@CdS heterostructures were synthesized by chemical vapor deposition (CVD) and their photoluminescence (PL) spectrums excited with visible light were carefully studied in our report. Two strong emission peaks on the PL spectrum located at ~693 nm and ~695 nm were reported when the wavelength of the exciting light are 457 nm and 532 nm respectively. The two emission peaks were proved to be originated from interstitial Sn2+ existing in the products. These results could enable scientists to explore novel properties and applications of the SnO2-based nanocomposites.