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Electronic absorption and fluorescence spectra as well as the photophysical properties of 20-(S)-camptothecin were studied in a series of organic solvents and in aqueous solution. The fluorescence quantum yield and lifetime were measured. In contrast to previously reported results, this study has demonstrated that there is a marked increase of fluorescence quantum yield and fluorescence lifetime...
Cadmium selenide (CdSe) quantum dots (QDs) were synthesized with a cubic shape having a diameter of ~5.24nm. The prepared CdSe QDs were characterized by using UV–visible, Fourier transform infrared (FTIR), powder X-ray diffraction (XRD) and transmission electron microscope (TEM) measurements. The UV–visible absorption spectra indicate that the optical band gap of CdSe QDs is ~622nm and the peak shift...
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