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Journal of Micro/Nanolithography, MEMS, and MOEMS

Indirect activation of porphyrin by semiconductor quantum dots with two-photon excitation
Author(s): Yanan Wen; Yuqiang Liu; Yuqiang Yang; Limin An; Weisi Song; Zhenling Yang
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Paper Abstract

Steady-state and nanosecond time-resolved spectroscopies are performed to investigate the interaction between CdSe quantum dots (QDs) and mesotetraphenylporphyrin (TPP) photosensitizers under two-photon excitation with 800-nm femtosecond laser pulses. The luminescent intensity and lifetime of the QDs decrease intensively in the QD-porphyrin mixture, whereas those of the TPP increase, suggesting occurence of a nonradiative fluorescence resonance energy transfer (FRET) process between the excited states of the donors and acceptors. An energy transfer efficiency of 0.27 is estimated from quenching of the excited-state radiative lifetime of the QDs. A 4-nm red shift in the emission spectrum of the CdSe QDs is observed after mixing with TPP, which is speculated to be caused by the energy transfer from QDs of small size to large. This study could be valuable for developing a QD-based drug system for application in two-photon excitation photodynamic therapy.

Paper Details

Date Published: 1 July 2010
PDF: 4 pages
J. Micro/Nanolith. 9(3) 031003 doi: 10.1117/1.3446806
Published in: Journal of Micro/Nanolithography, MEMS, and MOEMS Volume 9, Issue 3
Show Author Affiliations
Yanan Wen, Harbin Institute of Technology (China)
Yuqiang Liu, Harbin Institute of Technology (China)
Yuqiang Yang, Harbin Institute of Technology (China)
Limin An, Harbin Institute of Technology (China)
Weisi Song, Harbin Institute of Technology (China)
Zhenling Yang, Harbin Institute of Technology (China)

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