Photoluminescence properties of GaAsBi single quantum wells with 10% of Bi

Photoluminescence of tetrahedral quantum-dot quantum wells.

Taking into account the tetrahedral shape of a quantum-dot quantum well (QDQW) when describing excitonic states, phonon modes, and the exciton-phonon interaction in the structure, we obtain within a nonadiabatic approach a quantitative interpretation of the photoluminescence spectrum of a single CdS/HgS/CdS QDQW. We find that the exciton ground state in a tetrahedral QDQW is bright, in contrast...

Bismuth Quantum Dots in Annealed GaAsBi/AlAs Quantum Wells

Formation of bismuth nanocrystals in GaAsBi layers grown by molecular beam epitaxy at 330 °C substrate temperature and post-growth annealed at 750 °C is reported. Superlattices containing alternating 10 nm-thick GaAsBi and AlAs layers were grown on semi-insulating GaAs substrate. AlAs layers have served as diffusion barriers for Bi atoms, and the size of the nanoclusters which nucleated after s...

Quantitative study of localization effects and recombination dynamics in GaAsBi/GaAs single quantum wells

Photoluminescence microscopy of InGaN quantum wells

Submicron spatial resolution photoluminescence is used to assess radiative efficiency and spatial uniformity of GaN/InGaN heterojunctions. Room temperature photoluminescence of multiple InGaN quantum wells with GaN barriers fabricated by electron-cyclotron resonance assisted molecular beam epitaxy was measured as a function of position on a facet perpendicular to the layer structure. Our high r...

Photoluminescence properties of a quantum system consisting of different size GaAs quantum wells

Photoluminescence properties of a quantum system consisting of four different size GaAs quantum wells (Lz=15, 7, 4.5 and 3 nm) clad by 50 nm thick Al0.24Ga0.76As barriers have been investigated by steady-state and time-resolved (TR) photoluminescence (PL) experiments at 13-300 K. It is found that the low temperature PL emission energy distribution is not uniform over the four excitonic emission...