Origin of Blue Photoluminescence from Naturally Oxidized Porous Silicon
Upon the 325 nm excitation from a helium-cadmium laser, the photoluminescence (PL) from aged porous silicon was investigated with fluorescence spectroscopy. Each PL spectrum of the aged porous silicon films contained two luminescent bands, one of the luminescent bands peaked at about 466.7 nm whereas the other luminescent band peaked at about 596.1 nm. The origin of the blue PL from aged porous silicon was discussed, and our results indicated that the blue photoluminescence of porous silicon films originated from the silicon oxide itself.
Yuan Ming Huang
Y. M. Huang et al., "Origin of Blue Photoluminescence from Naturally Oxidized Porous Silicon", Solid State Phenomena, Vols. 181-182, pp. 374-377, 2012