Abstract:
Recent time resolved experiments on electronic relaxation in semiconductor quantum dots samples show an incomplete relaxation from electronic excited states, a fast depopulation of electronic ground states and a luminescence upconversion (anti-Stokes luminescence). We present an interpretation of these effects in terms of electron-LO-phonon scattering in 0D nanostructures. In addition to this, we show that a similar mechanism of electronic scattering can lead to an upconversion of electronic distribution to wetting layer states.