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(Color online) (a) XRD pattern and Raman spectrum of nanorods. (b) TEM image of the nanorods. [(c) and (d)] High-resolution TEM images of the nanorods and the corresponding selected area electron diffraction pattern.
(Color online) (a) PLE spectra of the emission (, solid line) and the emission (, dotted line) and (b) visible-NIR PL spectrum upon excitation of of 1D . The inset shows decay lifetimes of the luminescence under excitation of . The different fractions of in the samples are indicated in the figure.
(Color online) Schematic energy levels of showing possible mechanisms for a NIR QC under excitation of visible with .
Energy-transfer efficiency and quantum efficiency as a function of the concentration in 1D .
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