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. 2015 Apr 24;5:9932. doi: 10.1038/srep09932

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(b) TEM image of bigger Si–Yb–Er nanocrystals with various shapes embedded in Si_yN_x prepared by using irradiation of electron beam for 30min. (b) EL emission in optical communication window on the Si–Yb–Er nanocrystals sample prepared in nitrogen with irradiation of electron beam for 30min and annealing at 1050°C for 20min, in which stimulated emission characteristics are observed near 1600nm.