FLUORESCENCE INTERMITTENCY IN SINGLE CADMIUM SELENIDE NANOCRYSTALS PDF

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Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. A Nature Research Journal. In addition, their strongly size-dependent optical properties render them attractive candidates as tunable light absorbers and emitters in optoelectronic devices such as light-emitting diodes 3,4 and quantum-dot lasers 5,6 , and as optical probes of biological systems 7.

Here we show that light emission from single fluorescing nanocrystals of cadmium selenide under continuous excitation turns on and off intermittently with a characteristic timescale of about 0. This intermittency is not apparent from ensemble measurements on many nanocrystals.

Thus spectroscopic measurements on single nanocrystals can reveal hitherto unknown aspects of their photophysics. Alivisatos, A. Science , — Brus, L. A 53 , — Colvin, V. Nature , — Dabbousi, B.

Weisbuch, C. Growth , — Kirstaedter, N. Hines, M. Kortan, A. Ambrose, W. Bernard, J. Chepic, D. Roussignol, P. B 4 , 5—13 Murray, C. Becerra, L. Bowen Katari, J. Basche, T. Cook, R. Macklin, J. Norris, D. B 53 , — Download references. Reprints and Permissions.

Nirmal, M. Fluorescence intermittency in single cadmium selenide nanocrystals. Download citation. Received : 01 July Accepted : 24 September Issue Date : 31 October Journal of Superconductivity and Novel Magnetism Journal of Chemical Education Nanotechnology Angewandte Chemie The Journal of Chemical Physics By submitting a comment you agree to abide by our Terms and Community Guidelines.

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Skip to main content. Subscribe Search My Account Login. Register your interest. Access through your institution. Buy or subscribe. Change institution. Rent or Buy article Get time limited or full article access on ReadCube. References 1 Alivisatos, A.

Author information Author notes M. Brus Authors M. Nirmal View author publications. You can also search for this author in PubMed Google Scholar. View author publications. Rights and permissions Reprints and Permissions. About this article Cite this article Nirmal, M. Geetha , S. Higginbotham , Toby D. Palato , H. Seiler , H. Baker , C. Sonnichsen , P.

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Fluorescence intermittency in single cadmium selenide nanocrystals

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BIOLOGICAL AND BIOENVIRONMENTAL HEAT AND MASS TRANSFER SOLUTION MANUAL PDF

The Fluorescence Bioassay Platforms on Quantum Dots Nanoparticles

Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. A Nature Research Journal. In addition, their strongly size-dependent optical properties render them attractive candidates as tunable light absorbers and emitters in optoelectronic devices such as light-emitting diodes 3,4 and quantum-dot lasers 5,6 , and as optical probes of biological systems 7.

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Continue to access RSC content when you are not at your institution. Follow our step-by-step guide. As colloidal semiconductor nanocrystals are developed for a wider range of diverse applications, it becomes more important to gain a deeper understanding of their properties in order to direct synthetic efforts. While most synthetic developments are guided by changes in ensemble properties, certain applications such as those in nano-electronics and nano-photonics rely on properties of nanocrystals at the individual level. For such applications and even for a more detailed understanding of the ensemble behavior, single nanocrystal spectroscopy becomes a vital tool. This review looks at how single nanocrystal spectroscopy has been applied to materials based on modern synthetic techniques and how these studies are elucidating properties that remain hidden at the ensemble level. First, recent theoretical models that are important for understanding many observed phenomena are explored.

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We'd like to understand how you use our websites in order to improve them. Register your interest. In this paper, we present the optical properties and the platforms on fluorescent quantum dots for biological labeling, biomedical engineering and biosensor in molecular imaging. Quantum dots possess several properties that make them very attractive for fluorescent tagging: broad excitation spectrum, narrow emission spectrum, precise tunability of their emission peak, longer fluorescence lifetime than organic fluorophores and negligible photobleaching. We describe how to take such advantages of quantum dots to develop the technology and employ it to build assay platforms. Finally, ultrasensitivity, multicolor, and multiplexing of the technology of semiconductor quantum dots open up promising and interesting possibilities for bioassay platform.

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