Special Section on BioMEMS, Theory and Practice of MEMS/NEMS, and Sensors

Indirect activation of porphyrin by semiconductor quantum dots with two-photon excitation

[+] Author Affiliations
Yanan Wen, Yuqiang Liu, Yanqiang Yang

Harbin Institute of Technology, Center for Condensed Matter Science and Technology, Harbin, Heilongjiang, 150001, China

Limin An

Harbin Institute of Technology, Center for Condensed Matter Science and Technology, Harbin, Heilongjiang, 150001, China and Heilongjiang University, Physics Department of Science and Technology, Harbin, Heilongjiang, 150080, China

Weisi Song, Zhenling Yang

Harbin Institute of Technology, Center for Condensed Matter Science and Technology, Harbin, Heilongjiang, 150001, China

J. Micro/Nanolith. MEMS MOEMS. 9(3), 031003 (July 02, 2010). doi:10.1117/1.3446806
History: Received December 23, 2009; Accepted April 23, 2010; Published July 02, 2010; Online July 02, 2010
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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.

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© 2010 Society of Photo-Optical Instrumentation Engineers

Citation

Yanan Wen ; Yuqiang Liu ; Yanqiang Yang ; Limin An ; Weisi Song, et al.
"Indirect activation of porphyrin by semiconductor quantum dots with two-photon excitation", J. Micro/Nanolith. MEMS MOEMS. 9(3), 031003 (July 02, 2010). ; http://dx.doi.org/10.1117/1.3446806


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