نویسندگان
دانشکده فیزیک، دانشگاه یزد، یزد
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Simple and green synthesis of high-efficieny quantum dots QDs is of great significance and yet not fully implemented. Surface modification of QDs has a key role in improving their efficiency quantum. In this paper, the CdTe and CdTe/CdS core/shell QDs were synthesized in aqueous solution. The photoluminescence quantum yield of the CdTe QDs depended strongly on the growth of CdS shell. Therefore, the influence of various experimental conditions, including time reaction, pH solution, growth temperature, the S-to-Cd molar ratio and type of S source, on the growth rate of shell CdS has been systematically investigated. The QDs were characterized by fluorescence and UV-vis absorption spectroscopy, powder X-ray diffraction and transmission electron microscopy. The obtained CdTe-CdS core-shell QDs were highly photoluminescence quatntum yield with a widely tunable fluorescence emission window of 557–607 nm. With the growth of the CdS shell on the surface CdTe QDs, photoluminescence quatntum yield has increased significantly to 50. Thus, as high quality QDs have commercial potential
کلیدواژهها [English]