Size-dependent fluorescence in CdSe quantum dots

In this study, the authors adopt a non-toxic chemical route for synthesis of cadmium selenium quantum dots (QD) of five different size distributions. They have been characterized by UV/Vis absorption spectroscopy and transmission electron microscopy. Fluorescence spectroscopy is performed to investigate their optical emission with size-variation. By UV/Vis spectroscopy, a blue-shift is revealed and the band gap is calculated in each case. Transmission electron micrographs show QD of different size distributions (in the range 2–8 nm) and fluorescence spectra reveal green–orange luminescence depending upon the size distribution.