Activation of porphyrin photosensitizers by semiconductor quantum dots via two-photon excitation

Applied Physics Letters - Tập 95 Số 14 - 2009
Yanan Wen1, Weisi Song1, Limin An1,2, Yuqiang Liu1, Yinghui Wang1, Yanqiang Yang1
1Harbin Institute of Technology 1 Department of Physics, Center for Condensed Matter Science and Technology, , Harbin 150001, China
2Heilongjiang University 2 Physics Department of Science and Technology, , Harbin 150080, China

Tóm tắt

Energy transfer from water-soluble quantum dots (QDs) to porphyrinlike sensitizers is studied by time-resolved spectroscopy of two-photon excitation with femtosecond laser pulses. Evident transfer results are observed. Electron exchange is found to be the dominant transfer mechanism. Relative intensity change between excitonic and trapping emission implies that nonradiative energy transfer occurs through the trapping state of QDs, which presents a way of raising energy transfer efficiency in this type of donor-acceptor pairs. This study underlines the potential of QD-porphyrin model system for applications in two-photon excitation photodynamic therapy.

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Applied Physics Letters

Tập 95 Số 14

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