Title :
Indirect activation of porphyrin by semiconductor quantum dot with two-photon excitation
Author :
Wen, Yanan ; Yang, Yanqiang
Author_Institution :
Dept. of Phys., Harbin Inst. of Technol., Harbin, China
Abstract :
Flourescence resonance energy transfer (FRET) between CdSe quantum dots (QDs) and meso-tetraphenylporphyrin (TPP) photosensitizers is studied by two-photon excitation fluorescent spectroscopy with 800nm femtosecond laser pulses. Evident transfer results are obtained in both the steady-state and time-resolved experiments. A slight peak shift to the red region in the emission of the CdSe QDs is observed after addition of TPP, which is speculated to be caused by energy transfer from QDs of small size to larger. An efficiency of about 0.3 accounts for the non-radiative energy transfer is estimated with the time-resolved method.
Keywords :
II-VI semiconductors; cadmium compounds; fluorescence; fluorescence spectroscopy; high-speed optical techniques; semiconductor quantum dots; CdSe; femtosecond laser pulses; flourescence resonance energy transfer; meso-tetraphenylporphyrin photosensitizers; nonradiative energy transfer; porphyrin indirect activation; semiconductor quantum dot; time-resolved method; two-photon excitation fluorescent spectroscopy; wavelength 800 nm; Fluorescence; Lead; Photonics; fluorescence resonance energy transfer; photodynamic therapy; quantum dots; two-photon excitation;
Conference_Titel :
Nano/Molecular Medicine and Engineering (NANOMED), 2009 IEEE International Conference on
Conference_Location :
Tainan
Print_ISBN :
978-1-4244-5528-7
DOI :
10.1109/NANOMED.2009.5559119
