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

Journal Article · Mon Oct 05 00:00:00 EDT 2009 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.3243979· OSTI ID:21308711

Yanan, Wen; Weisi, Song; Yuqiang, Liu; Yinghui, Wang; Yanqiang, Yang ^[1]; Limin, An ^[1]

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1. Department of Physics, Center for Condensed Matter Science and Technology, Harbin Institute of Technology, Harbin 150001 (China)

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.

• OSTI ID: 21308711
• Journal Information: Applied Physics Letters, Vol. 95, Issue 14; Other Information: DOI: 10.1063/1.3243979; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
CADMIUM COMPOUNDS
ELECTRON EXCHANGE
ENERGY TRANSFER
EXCITATION
EXCITONS
MULTI-PHOTON PROCESSES
PHOTOCHEMISTRY
PHOTONS
PORPHYRINS
QUANTUM DOTS
SEMICONDUCTOR MATERIALS
SENSITIZERS
SPECTROSCOPY
TIME RESOLUTION