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TEM image of Er, doped silica. Inset: (right) high resolution image of a quantum dot and (left) histogram of the distribution of cluster size from TEM analysis.
PL spectrum (open circles) of Er, glass ceramic excited at . The Gaussian fits of the main spectral components are drawn in solid curves.
PL spectra in the visible range of Er, doped silica excited at at different temperatures (from , steps of about ). Inset: thermal behavior of the normalized (filled circles) and (open circles) moments of the PL band.
Thermal behavior of the second moment of the defect-related PL band excited at . The solid line is the fit to Eq. (1); a schematics of the phonon mode in SnO is also shown (filled and empty circles are tin and oxygenatoms, respectively). Inset: Raman spectrum of the material in the energy region of SnO mode.
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