Materials, Photonic Devices, and Sensors

Concentration and size dependence of peak wavelength shift on quantum dots in colloidal suspension

[+] Author Affiliations
Benjamin S. Rinehart, Caroline G. L. Cao

Wright State University, Department of Biomedical, Industrial, and Human Factors Engineering, 3640 Colonel Glenn Highway, Dayton, Ohio 45435, United States

Opt. Eng. 55(8), 087106 (Aug 19, 2016). doi:10.1117/1.OE.55.8.087106
History: Received May 12, 2016; Accepted August 2, 2016
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Abstract.  Quantum dots (QDs) are semiconductor nanocrystals that have significant advantages over organic fluorophores, including their extremely narrow Gaussian emission bands and broad absorption bands. Thus, QDs have a wide range of potential applications, such as in quantum computing, photovoltaic cells, biological sensing, and electronics. For these applications, aliasing provides a detrimental effect on signal identification efficiency. This can be avoided through characterization of the QD fluorescence signals. Characterization of the emissivity of CdTe QDs as a function of concentration (1 to 10  mg/ml aqueous) was conducted on 12 commercially available CdTe QDs (emission peaks 550 to 730 nm). The samples were excited by a 50-mW 405-nm laser with emission collected via a free-space CCD spectrometer. All QDs showed a redshift effect as concentration increased. On average, the CdTe QDs exhibited a maximum shift of +35.6  nm at 10  mg/ml and a minimum shift of +27.24  nm at 1  mg/ml, indicating a concentration dependence for shift magnitude. The concentration-dependent redshift function can be used to predict emission response as QD concentration is changed in a complex system.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Topics

Quantum dots

Citation

Benjamin S. Rinehart and Caroline G. L. Cao
"Concentration and size dependence of peak wavelength shift on quantum dots in colloidal suspension", Opt. Eng. 55(8), 087106 (Aug 19, 2016). ; http://dx.doi.org/10.1117/1.OE.55.8.087106


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