20 February 2015 Preparation and characterization of CdSe colloidal quantum dots by pptical spectroscopy and 2D DOSY NMR
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Proceedings Volume 9258, Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies VII; 92581W (2015) https://doi.org/10.1117/12.2070448
Event: Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies 2014, 2014, Constanta, Romania
Abstract
We present experimental results on preparation and characterization of colloidal CdSe quantum dots (QD) in organic solvent. CdSe QDs were synthesized following a modified literature method and have been characterized by UV-Vis absorption and photoluminescent (PL) spectroscopy, as well as by 2D Diffusion Ordered Spectroscopy (DOSY) NMR. The average CdSe particles size estimated from the UV-Vis absorption spectra was found to be in the range 2.28 - 2.92 nm, which correlates very well with the results obtained from NMR measurements. The PL spectrum for CdSe nanodots can be characterized by a narrow emission band with the peak maximum shifting from 508 to 566 nm in dependence of the CdSe nanoparticle size. The PL is dominated by a near-band-edge emission, accompanied by a weak broad band in the near IR, related to the surface shallow trap emission.
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I. Geru, I. Geru, O. Bordian, O. Bordian, I. Culeac, I. Culeac, C. Turta, C. Turta, V. Verlan, V. Verlan, A. Barba, A. Barba, } "Preparation and characterization of CdSe colloidal quantum dots by pptical spectroscopy and 2D DOSY NMR", Proc. SPIE 9258, Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies VII, 92581W (20 February 2015); doi: 10.1117/12.2070448; https://doi.org/10.1117/12.2070448
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