Formation of core/shell PbS/Na2SrSi2O6 nanocrystals in glass

Abstract

In this work, PbS QDs were precipitated in the glass containing sodium strontium silicate (Na2SrSi2O6) nanocrystals. Tunable absorption and photoluminescence of PbS QDs in the range of 1700-2200 nm were achieved through thermal treatment. Increased heat-treatment duration and temperature would induce the formation of Na2SrSi2O6 nanocrystals. The results from absorption and photoluminescence spectra and X-ray diffraction patterns indicated that PbS QDs acted as nucleating agents for Na2SrSi2O6 nanocrystals and facilitate their formation. The high resolution transmission electron microscopy analysis confirmed that PbS/Na2SrSi2O6 core/shell nanocrystals were formed in the glass. (C) 2016 Optical Society of America