Enhanced phonon-assisted photoluminescence in InAs/GaAs parallelepiped quantum dots

Photoluminescence Spectra of Quantum Dots: Enhanced Probabilities of Phonon-assisted Transitions

J. T. Devreese, E. P. Pokatilov, V. M. Fomin, V. N. Gladilin Theoretische Fysica van de Vaste Stof, Universiteit Antwerpen (UIA), Universiteitsplein 1, B-2610 Antwerpen, Belgium Universiteit Antwerpen (RUCA), Groenenborgerlaan 171, B-2020 Antwerpen, Belgium TU Eindhoven, P. O. Box 513, 5600 MB Eindhoven, The Netherlands Fizica Structurilor Multistratificate, Universitatea de Stat din Moldova, s...

Tunnel Magnetoresistance for Phonon-Assisted Tunneling through Quantum Dots

Spin-polarized transport through a single-level quantum dot interacting with a local phonon mode is studied in the frame of the nonequilibrium Green-function technique. It is shown that strong electron–phonon interaction gives rise to a significant current suppression, to additional resonance peaks in the differential conductance as well as to oscillations of the tunnel magnetoresistance. Also,...

Competition between zero-phonon and phonon-assisted luminescence in colloidal CdSe quantum dots

Photoluminescence of silicon quantum dots in nanospheres.

Si quantum dots (SiQDs) based nanospheres (SiNSs) were prepared via a novel synthetic strategy. These SiNSs were demonstrated to possess unique dot spacing dependent photoluminescence (PL) up-conversion and surface dependent (N modified surface) down-converted PL. It was demonstrated that a small distance between SiQDs (<5 nm) is the necessary condition for the PL up-conversion of SiNSs, while ...

Photoluminescence upconversion in colloidal CdTe quantum dots

Efficient photoluminescence ~PL! up-conversion has been observed in colloidal CdTe quantum dots with an energy gain of as high as 360 meV. Compared with the normal PL, the peak energy of this up-converted PL ~UCPL! shows a redshift of about 80 meV, and the corresponding radiative lifetime becomes nearly twice as long. This UCPL is attributed to the carrier recombination involving surface states...