Origin Of The Luminescence From Sno2 Nanoribbons

Time-resolved X-ray excited optical luminescence and X-ray absorption near-edge structures have been employed to study the origin of the multi-color luminescence from SnO2 nanoribbons. We find that the yellow-green luminescence has a long lifetime while the blue luminescence a short one. The luminescence is attributed to the radiative decay of trapped electrons in oxygen vacancies just below the conduction band and electrons in the conduction band to intrinsic surface states in the band gap.