Figure 1From: Nanoscale evidence of erbium clustering in Er-doped silicon-rich silicaPhotoluminescence spectra. Photoluminescence spectra of the sample detected for as-grown and annealed samples in (a) visible spectral range (500 to 950 nm) and (b) infrared spectral range (1.4 to 1.6 μ m). The experiments have been carried out using the 476.5-nm wavelength (nonresonant excitation for Er3+ ions).Back to article page