What is it about?
CdTe@SiO2 fluorescent nanospheres were synthesized by heating reflux method. Infrared spectra support the structural formation mechanism of the CdTe@SiO2 composite nanospheres. The CdTe@SiO2 composite nanospheres were characterized by means of SEM, TEM, IR, nitrogen adsorption isotherm, fluorescence spectra and electroluminescence spectra, etc. It was found that both pH value and reflux time played important roles in growth and quantum yield of CdTe@SiO2 fluorescent nanospheres. CdTe@SiO2 fluorescent nanospheres were fabricated to be a single electrode light-emitting diode prototype. The electroluminescence spectra and Commission International de L’Eclairage remained almost the same over a range of operation voltages, and it meant the light-emitting diodes had better color stability. So CdTe@SiO2 fluorescent nanospheres could provide a potential application in light-emitting diode.
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Why is it important?
However, all the samples were prepared in the dark and under oxygen free condition. The reaction was controlled difficultly, and the conditions were severe. The CdTe@SiO2 composite spheres were used for confocal images of cells. However, no studies had been reported about electrode light-emitting diode so far.
Perspectives
In this work, we reported a heating reflux method which was controlled simple and no need in the dark and under oxygen free compared with previous work. The CdTe were attached by Na2SiO3 on the surface of SiO2 nanospheres to form CdTe@SiO2 composite nanospheres, so it constituted a novel method. The CdTe@SiO2 composite nanospheres had better stability in the open air and were water-soluble. Photoluminescence color of CdTe@SiO2 fluorescent nanospheres could be controlled by reaction time. We provided some experimental results to support the structural formation mechanism for the CdTe@SiO2 composite nanospheres. CdTe@SiO2 fluorescent nanospheres were fabricated to be a single electrode light-emitting diode and their electroluminescence spectra, Commission International de L’Eclairage and the current density versus voltage were investigated for the first time.
Dr Di Li
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This page is a summary of: Stable and water-soluble CdTe@SiO2 composite nanospheres: Preparation, characterization and application in LED, Colloids and Surfaces A Physicochemical and Engineering Aspects, May 2013, Elsevier,
DOI: 10.1016/j.colsurfa.2013.02.027.
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