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A unified model of phonon-assisted and zero-phonon radiative transitions in nanoscale silicon structures is presented. For characteristic sizes above 15--20, phonon-assisted transitions dominate, while zero-phonon transitions, allowed due to the finite-size effect, are more important for smaller length scales. Light emission from porous silicon is analyzed on the basis of these results showing that phonon-assisted transitions should dominate the emission in the observed red band.
Mark S. Hybertsen (Mon,) studied this question.