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    
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.
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    
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
Biological Science Disciplines
Cadmium Compounds / chemistry,  radiation effects*
Quantum Dots
Selenium Compounds / chemistry,  radiation effects*
Spectrometry, Fluorescence
Ultraviolet Rays
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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