Work

Emission Spectral Properties of Cadmium Sulfide Nanoparticles with Multiphoton Excitation

Year: 2002

Type: article

Abstract: We describe the luminescence spectral properties of CdS nanoparticles with multiphoton excitation. Three types of CdS nanoparticles were examined which were a CdS/dendrimer composite which displays high anisotropy, Cd 2+ -enriched nanoparticles which display two emission maxima, and polyphosphate-stabilized nanoparticles which display long wavelength emission. Illumination with long wavelengths near 700−790 nm resulted in two-photon excitation. Essentially the same emission spectra and intensity decays were observed with one-photon and two-photon excitation. Comparison with fluorescein indicates the NPs display large two-photon cross sections near 100 GM. The CdS/dendrimer and Cd 2+ -enriched CdS nanoparticles displayed large anisotropy values with two-photon excitation, substantially larger than with one-photon excitation. It appears that semiconductor nanoparticles are comparable to organic fluorophores which display the same spectral properties with one-photon and two-photon excitation.

Source: The Journal of Physical Chemistry B

DOI: 10.1021/jp0134953

Authors: Joseph R. Lakowicz, Ignacy Gryczynski, Gregorz Piszczek, Catherine J. Murphy

Institutions: University of Maryland, Baltimore, University of South Carolina

Language: English

Topic: Quantum Dots Synthesis And Properties

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: green

Funder: National Center for Research Resources

Award: Center for Fluorescence Spectroscopy