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24 November 2010 Complex of water-soluble CdSe/ZnS quantum dots and chlorin e6: interaction and FRET
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Proceedings Volume 7376, Laser Applications in Life Sciences; 737607 (2010)
Event: Laser Applications in Life Sciences 2010, 2010, Oulu, Finland
In this work we present the spectral study on complex formation between CdSe/ZnS-amino (620 nm) quantum dots (QDs) and second-generation photosensitizer chlorin e6 (Ce6). In the presence of QDs, significant changes in the absorption and fluorescence properties of Ce6 were observed. The fluorescence spectrum of bound Ce6 molecules displayed the new intensive fluorescence band at 670 nm, similar to that observed in organic solvent chloroform. With an increase in QDs:Ce6 molar ratio up to 1:20, the spectrum of QDs-Ce6 showed the decrease in intensity of QDs fluorescence band at 620 nm, while the intensity of fluorescence band at 670 nm was increasing simultaneously. The fluorescence excitation spectrum of bound Ce6 molecules exposed a contribution of QDs spectrum. The fluorescence decay measurements of QDs-Ce6 solution displayed the shortening of QDs fluorescence lifetime at increasing Ce6concentration. We conclude, that Ce6 molecules interact with the hydrophobic groups of QDs coating, which results in the changes of spectral properties of Ce6. Upon binding, Ce6 molecules are located close enough to the shell/core of QDs for Förster resonance energy transfer (FRET) from QDs to Ce6 to occur.
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J. Valanciunaite, A. Skripka, G. Streckyte, and R. Rotomskis "Complex of water-soluble CdSe/ZnS quantum dots and chlorin e6: interaction and FRET", Proc. SPIE 7376, Laser Applications in Life Sciences, 737607 (24 November 2010);

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