Figure 2

(a) Fluorescent image of Y1.94O3:Ho3+0.02/Yb3+0.04 nanorod bundles at excitation wavelength of 980 nm. (b) PL mapping image of nanorod bundles at excitation wavelength of 980 nm at same location from where the fluorescent image was taken. (c) PL mapping image of two nanorod bundles at two different places with different profile heights, insets show the PL intensity distribution at different positions.