Interdot carrier transfer in semimagnetic Pb1-xMnxSe nanocrystals embedded in oxide glass

Temperature- and excitation-intensity-dependent photoluminescence (PL) spectra of semimagnetic Pb1-xMnxSe nanocrystals embedded in glass matrix have been studied. Two types of dot families with different sizes and dispersions were identified by spectral deconvolution in Gaussian components with different full widths at half maxima values. Temperature induced carrier-transfer interdots are responsible for the sigmoidal temperature dependence of the higher PL peak energy and for anomalous enhanced photoluminescence emission efficiency, at low temperatures. The activation energy of nonradiative channel responsible for a strong thermal quenching, at T > 80K, is deduced from an Arrhenius plot of integrated PL intensity. (C) 2010 Elsevier B.V. All rights reserved.