Document Detail


Enhancement of the photoluminescence of CdSe quantum dots during long-term UV-irradiation: privilege or fault in life science research?
MedLine Citation:
PMID:  15246356     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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.
Authors:
Zhivko Zhelev; Rajan Jose; Toshimi Nagase; Hideki Ohba; Rumiana Bakalova; Mitsuru Ishikawa; Yoshinobu Baba
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
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:
Created Date:  2004-07-12     Completed Date:  2005-07-14     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8804966     Medline TA:  J Photochem Photobiol B     Country:  Switzerland    
Other Details:
Languages:  eng     Pagination:  99-105     Citation Subset:  IM    
Affiliation:
Natural-Substance Composed Materials Group, National Institute for Advanced Industrial Science and Technology, AIST-Kyushu, Tosu, Saga-ken, Japan.
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MeSH Terms
Descriptor/Qualifier:
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:
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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