Abstract
The visible photoluminescence (PL) of porous silicon (PS) has been investigated in terms of the behavior of PL excitation and emission spectra. It is shown that for appropriately prepared samples, the excitation and emission spectra become entirely independent of the emission and excitation wavelengths, respectively, while both their bandwidths and the large Stokes shift between them remain unchanged. The result indicates that the broad PL bands of PS are due to homogeneous broadening, and that carrier localization accompanied by a strong electron-phonon coupling plays an important role in the visible luminescence of PS.
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