| Enhancement of the photoluminescence of CdSe quantum dots during long-term UV-irradiation: privilege or fault in life science research? | |
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MedLine Citation:
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PMID: 15246356 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The present study describes an impressive enhancement of the photoluminescence (PL) intensity of low-temperature synthesized CdSe nanocrystals (75 degrees C) during long-term UV-irradiation. The integrated PL-intensity of CdSe core and CdSe/ZnS core/shell nanocrystals, dispersed in chloroform, enhanced about 3 and 6 times, respectively, during 9 h exposure to UV-light, without any significant changes in the characteristic absorbance spectra and shifting of PL-spectra. After termination of the irradiation a comparatively slow photobleaching was detected with tau(1/2) = 6 h for CdSe core and tau(1/2) = 14 h for CdSe/ZnS core/shell nanocrystals. The most impressive was the effect of UV-irradiation on the photoluminescence of water-soluble CdSe nanocrystals. The integrated PL-intensity enhanced about 10 times during 11 h exposure to UV-light and the improved PL-intensity was preserved during 3 days after termination of the irradiation without any significant photobleaching. The results are discussed in the context of application of CdSe nanocrystals as novel fluorophores in life science experiments. |
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Authors:
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Zhivko Zhelev; Rajan Jose; Toshimi Nagase; Hideki Ohba; Rumiana Bakalova; Mitsuru Ishikawa; Yoshinobu Baba |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of photochemistry and photobiology. B, Biology Volume: 75 ISSN: 1011-1344 ISO Abbreviation: J. Photochem. Photobiol. B, Biol. Publication Date: 2004 Jul |
Date Detail:
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Created Date: 2004-07-12 Completed Date: 2005-07-14 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 8804966 Medline TA: J Photochem Photobiol B Country: Switzerland |
Other Details:
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Languages: eng Pagination: 99-105 Citation Subset: IM |
Affiliation:
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Natural-Substance Composed Materials Group, National Institute for Advanced Industrial Science and Technology, AIST-Kyushu, Tosu, Saga-ken, Japan. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Biological Science Disciplines Cadmium Compounds / chemistry, radiation effects* Crystallization Luminescence* Quantum Dots Selenium Compounds / chemistry, radiation effects* Spectrometry, Fluorescence Ultraviolet Rays |
| Chemical | |
Reg. No./Substance:
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0/Cadmium Compounds; 0/Selenium Compounds; 1306-24-7/cadmium selenide |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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