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Recent advances on luminescence in porous silicon

Our recent work in seeking the confirmative experimental evidences which support the quantum confinement mechanism of visible light emission from porous silicon (PS) is presented. The first successful observation of efficient infrared up-conversion luminescence verifies that the PS sample is an assembly of quantum confined structures with reduced dimensionalities. A double-resonance enhanced third-order nonlinear optical process is suggested to interpret the experimental observation. The carrier transfer mechanism involved in the light emission process is studied by the picosecond time-resolved luminescence spectroscopy. A comprehensive luminescence model which takes account into both the effects of quantum confinement and of surface states as well as the carrier transfer dynamics is proposed.