Photoluminescence properties of PbSe/PbS core‐shell quantum dots

Abstract

Abstract The present study describes the investigation of the ground‐state exciton emission in the PbSe/PbS core‐shell colloidal quantum dots (CQDs) with different core‐radius/shell‐thickness ratio, by recording temperature dependence of ground‐state exciton photoluminescence (PL) properties, including line‐width, integrated PL intensity, and the temperature coefficient of energy band‐gap, over a temperature range from 1.4 K to 300 K. The obtained data reveal a reduction of the temperature coefficient of the energy band‐gap as well as slightly decrease of exciton and optical phonon coupling in the PbSe/PbS core‐shell CQDs with respect to that in the corresponding PbSe core. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)