The role of in the blue luminescence in hydrothermally prepared porous silicon

Blue photoluminescence (PL) in hydrothermally prepared porous silicon (PS) was found to be insensitive to the composition of silicon oxide, and the peak position of the blue band changes with changing excitation wavelength. All these factors suggested that silicon oxide cannot be responsible for the blue PL. High-density quantum dots were observed in the PS layer by high-resolution electron microscopy (HREM) analysis, and were suggested to be responsible for the emission.