Personne
Awos Al Salman
Cette personne n’est plus à l’EPFL
Publications associées (6)
A model for the multi-exponential excited-state decay of CdSe nanocrystals
Majed Chergui, Frank van Mourik, Awos Al Salman
We report on photoluminescence decay measurements of CdSe nanoparticles over several decades of intensities and times, and as a function of size and temp. A model is proposed for the multi-exponential decay kinetics, and their temp. dependence, in which a ...
2009Multimodal Distribution of Quantum Confinement in Ripened CdSe Nanocrystals
Majed Chergui, Philip Pattison, Awos Al Salman
We present three different prepn. methods for CdSe colloidal nanoparticles that, when carried out into the Ostwald ripening regime, lead to the development of complex spectral patterns resulting from the overlap of several distinct components corresponding ...
2008Spectroscopy and kinetic studies of electron-hole recombination in CdSe nanoparticles
This thesis presents an experimental study of the energy and time-resolved optical response of chemically prepared CdSe nanoparticles with different sizes, shapes (dots, rods, and tetrapods), and lattice structures (wurtzite and zinc blende). The first par ...
EPFL2007Temperature effects on the spectral properties of colloidal CdSe nanodots, nanorods, and tetrapods
Majed Chergui, Frank van Mourik, Awos Al Salman
The temp. dependence of the absorption and fluorescence spectra of colloidal CdSe nanocrystals was compared for three different shapes (dots, rods, and tetrapods) at 4-300 K. While the shift of the fluorescence max. indicates little dependence on the shape ...
2007Femtosecond polarization relaxation in CdSe nanocrystals
Majed Chergui, Frank van Mourik, Awos Al Salman
We present ultrafast pump-probe studies on chem. prepd. CdSe nanocrystals. Upon pulsed optical excitation we find pronounced oscillations, indicating strong coupling to a LO phonon mode. From the polarization dependence of the signal addnl. information abo ...
2007Synthesis of high quality zinc blende CdSe nanocrystals
Highly homogeneous and luminescent CdSe colloidal nanocrystals in the less common zinc blende crystal structure have been obtained at high temperature in a noncoordinating organic solvent. The key parameter appears to be the addition of a phosphonic acid t ...
2005