Título del libro: Strongly Confined Pbs Quantum Dots: Emission Limiting, Photonic Doping, And Magneto-Optical Effects
JORGE ALEJANDRO REYES ESQUEDA; BRUNO ULLRICH;
Autores externos:
Idioma:
Inglés
Año de publicación:
2016
Palabras clave:
Carrier transport; Diagnosis; Drug delivery; Effluent treatment; Gallium arsenide; III-V semiconductors; IV-VI semiconductors; Lead; Lead compounds; Light transmission; Magnetic resonance imaging; Magnetooptical effects; Medical imaging; Nanocrystals; Optical properties; Organic solvents; Semiconductor doping; Supercritical fluids; Applied magnetic fields; Biomedical research; Indispensable tools; Medical diagnostics; Monochromatic light; Novel applications; Temperature range; Two-photon excitations; Semiconductor quantum dots
Resumen:
Quantum dots (QDs) have proved themselves to be an indispensable tool in various fields including biomedical research, fluorescence devices, drug delivery, light harvesting, alternative imaging techniques, and novel applications of soft materials. In this chapter, we review our work on the optical properties including transmission, reflection, and photoluminescence (PL) of oleic acid-capped colloidal 2-5 nm PbS QDs in toluene and deposited on glass and GaAs substrates formed by solvent deposition, and a supercritical fluid method, respectively. The experiments have been carried out in the temperature range from 5 to 300 K using monochromatic light and lasers as optical stimuli. The experiments reveal novel insights about QD PL intensity limiting, photonic doping of quantized soft matter, i.e. of QDs in solution, and magneto-optical effects achieved with magnetic flux densities below 1 T. We show that, as charge carrier transport in nanowires, the emission of QDs inherently possesses a square root limitation as a function of the impinging optical stimulus and that two-photon excitation of QDs can be used for all-optical chemically inert quantized matter doping. Additionally, we reveal the potential of PbS QD thin films to be used for magneto-tunable mirrors, while the experiments demonstrate the influence of the experimental geometry on the fundamental transition in QDs and the impact of the stoichiometry on the diamagnetic properties of QDs in general. Most notably, from the practical point of view, we report here the discovery of emission amplitude tuning of QDs due to applied magnetic fields. The finding is considerably important for medical diagnostics applications such as magnetic resonance imaging. © 2017 Scrivener Publishing LLC. All rights reserved.
Entidades citadas de la UNAM:
ISBN:
9781119241966
Editorial:
wiley Nombre de la publicación:
Strongly Confined PBS Quantum Dots: Emission Limiting, Photonic Doping, and Magneto-Optical Effects
Página inicial:
353
Página final:
384
