Spectroscopy characterization and quantum yield determination of quantum dots

3rd International Meeting for Researchers in Materials and Plasma Technology; 1st Symposium on Nanoscience and Nanotechnology

物理学;材料科学

Ortiz, S.N. Contreras^1 ; Ospino, E. Mejía^1 ; Cabanzo, R.^1

Universidad Industrial de Santander, Bucaramanga, Colombia^1

关键词: CdSe/ZnS;    Core/shell;    Fluorescence spectra;    Hydrophilic and hydrophobic;    Quinine sulphate;    Synchronous spectra;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/687/1/012097/pdf
DOI  :  10.1088/1742-6596/687/1/012097

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In this paper we show the characterization of two kinds of quantum dots: hydrophilic and hydrophobic, with core and core/shell respectively, using spectroscopy techniques such as UV-Vis, fluorescence and Raman. We determined the quantum yield in the quantum dots using the quinine sulphate as standard. This salt is commonly used because of its quantum yield (56%) and stability. For the CdTe excitation, we used a wavelength of 549nm and for the CdSe/ZnS excitation a wavelength of 527nm. The results show that CdSe/ZnS (49%) has better fluorescence, better quantum dots, and confirm the fluorescence result. The quantum dots have shown a good fluorescence performance, so this property will be used to replace dyes, with the advantage that quantum dots are less toxic than some dyes like the rhodamine. In addition, in this work we show different techniques to find the quantum dots emission: fluorescence spectrum, synchronous spectrum and Raman spectrum.