The curved surface (CS) effect breaks symmetrical shape of nanosilicon on which some bonds can produce localized electron states in band gap. The different curvature can form the characteristic electron states for some special bonding on nanosilicon surface, which are related to a series peaks in photoluminecience (PL), such as L_N, L_NO, L_O1 and L_O2 line in PL spectra due to Si–N, Si–NO, Si=O and Si–O–Si bond on curved surface, respectively. Si–Yb bond on curved surface of Si nanostructures can manipulate the emission wavelength into the window of optical communication by the CS effect, which is marked as L_Yb line.