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Transmission optical absorption spectra of the nanobelts: (a) the relationship between the absorption coefficient and photon energy , and (b) relationship between and photon energy .
Photoluminescence of the nanobelts under excitation of at room temperature. Dotted line shows the Gauss-fit peaks, centered at 1.8, 2.3, and , respectively.
The photoluminescence excitation spectra of the nanobelts with detection at (a) and (b) .
Model for photoluminescence in the nanobelts.
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