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- W2035910081 abstract "Experimental studies of Ge nanocrystals embedded in SiO2 films doped with Er and Yb deposited by rf-magnetron sputtering are presented. Although inter-band photoluminescence (PL) from the Ge nanocrystals is not observed, it is nevertheless found that the presence of Ge nanocrystals is crucial for obtaining light emission from Er3+ and Yb3+. For both kinds of rare earth ions, the intensity of the related PL line has a maximum after heat treatment at 800 °C, and the PL excitation spectra for the two cases are very similar. This suggests that the presence and the structure of the nanocrystals are important for the efficiency of PL from Er3+ and Yb3+. Experiments performed with multilayer structures of Ge nanocrystals and SiO2 show that the optically active rare earth ions are located in the SiO2 layers, and not inside the Ge nanocrystals. The mechanism of energy transfer from Ge nanocrystals to the rare earth ions is found to be non-optical." @default.
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- W2035910081 date "2006-04-28" @default.
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- W2035910081 title "Rare earth ions and Ge nanocrystals in SiO2" @default.
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- W2035910081 doi "https://doi.org/10.1088/0957-4484/17/10/029" @default.
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