Photophysical properties of biologically compatible CdSe quantum dot structures

Article Abstract:

The photophysical properties of CdSe and ZnS(CdSe) semiconductor quantum dots in nonpolar and aqueous solutions with steady-state (absorption and emission) and time-resolved (timecorrelated single-photon-counting) spectroscopy are examined. The result reveals that even with heavily quenched CdSe solublized with mercapotacetic acid it is still possible to modulate the emission using a hole acceptor such as adenine.

Aqueous solution reactions, Chemical properties

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Photooxidation and photobleaching of single CdSe/ZnS quantum dots probed by room-temperature time-resolved spectroscopy

Article Abstract:

The room-temperature luminescence of single CdSe/ZnS core-shell quantum dots is investigated by spectrally and temporally resolved confocal microscopy. A large (30 nm) blue shift is observed in the emission wavelength during illumination in air where the blue shift in air is ascribed to a 1 nm shrinkage of the CdSe core by photooxidation.

Zinc Sulfate

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Photoinduced charge transfer between CdSe quantum dots and p-phenylenediamine

Article Abstract:

The photophysical properties of CdSe nanocrystals arising from the interaction with p-phenylenediamine (PPD) are studied. A surface bound complexation equilibrDium model is proposed.

Structure

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