Emission Spectral Properties of Cadmium Sulfide Nanoparticles with Multiphoton Excitation

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.

Blueing, Bleaching, and Blinking of Single CdSe/ZnS Quantum Dots

“…The relative ease with which TPE can be performed on QDs is due to the high cross-sections. Lakowicz et al [33] report a TPE cross section of 10 À48 cm 4 s photon À1 at 700 nm, which is much larger than the one for fluorescein at 700 nm. [34,35] Blanton et al [10] calculated cross-sections as large as 10 À46 cm 4 s photon À1 at 800 nm.…”

Hydrothermal Synthesis, Characterization and Raman Vibrations of Chalcogenide SnS Nanorods

“…Researcher have been paying attention to controlled shaped morphology of nanomaterials after growth, particularly solution-phase fabrication of one-dimensional nanostructures of binary semiconductors materials. Nanostructures of metal chalcogenides such as CdS, CdSe, ZnS, SnS, etc., have attracted considerable interest having their application in optical, electronic and superconductor devices [1,2]. Narrow band gap IV-VI (IV = Sn, Ge, Pb; VI = S, Te, Se) semiconductors exhibiting infrared (IR) and near-infrared (NIR) optical activity have been extensively studied.…”

Microbe-mediated synthesis of antimicrobial semiconductor nanoparticles by marine bacteria

“…The microbial synthesis of nanoparticles had been recently recognized as a promising source of nanomaterials [9]. CdS has promising applications in technical fields such as photochemical catalysis, gas sensor, detectors for laser and infrared, solar cells, nonlinear optical materials and various luminescence devices [10][11][12][13]. CdS nanoparticle synthesis has been a modern growing field of research due to its important optical, physical and chemical properties.…”