Synthesis and characterization of mondispersed CdSe nanocrystals at lower temperature |
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| Institution: | 1. School of Chemistry & Environmental Engineering and Center of Analysis and Testing, Yancheng Teachers University, Yancheng 224007, PR China;2. State Key Laboratory of Materials-Oriented Chemical Engineering and College of Science, Nanjing Tech University, Nanjing 210009, PR China;3. State Key Lab & Coordination Chemistry Institute, Nanjing University, Nanjing 210093, PR China;1. Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS-Université de Rennes 1, Campus de Beaulieu, Bât 10A, 35042 Rennes cedex, France;2. Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznan, Poland;1. Analytical and Testing Center, Southwest University of Science and Technology, Mianyang 621010, China;2. Department of Materials, Southwest University of Science and Technology, Mianyang 621010, China;1. Department of Physics, University of Calcutta, 92, Acharya Prafulla Chandra Road, Kolkata 700009, India;2. Department of Physics, Bose Institute, 93/1, Acharya Prafulla Chandra Road, Kolkata 700009, India |
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| Abstract: | Nearly monodispersed CdSe quantum dots have been prepared by a soft solution approach using air-stable reagents at lower temperature. The temporal evolution of the absorption and room temperature photoluminescence spectra were used to follow the reaction process and to characterize the optical properties of as-prepared CdSe quantum dots. The results exhibited clear exciton peaks in absorption and bright band-edge luminescence. The structures of the CdSe nanocrystals were determined by X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM). The influence of the temperature on the properties of the resultant CdSe nanocrystals was investigated. The distribution of properties within ensembles of CdSe nanocrystals was also studied. A drastic difference in the photoluminescence efficiencies of size-selected fractions was observed. |
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