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It is shown that the green/blue photoluminescence from oxidized nanocrystalline and porous silicon, which has been attributed to the blue shift of the band gap in small silicon nanocrystals, is due to silanol groups; Si-OH. Alanol groups, = Al-OH and hydrated lead oxide, PbO 2 (OH) show the same photoluminescence in terms of spectral distribution and fast decay time of several nanoseconds...