Publication

Photoluminescence and carrier dynamics in GaAs quantum wells

Vincenzo Savona
1997
Conference Papers

Abstract

We use a rate equation model in order to reproduce the dynamics of two-dimensional excitons and free carriers in a time resolved photoluminescence experiment. We investigate the dynamics of the exciton formation from free electron-hole pairs, and the evolution of Is excitons within their band. The interaction of excitons and free carriers with optical and acoustic phonons is considered. The shape of the time resolved photoluminescence signal is considerably different in the case of acoustic or optical phonon assisted formation. An analysis of the photoluminescence rise as a function of the lattice temperature and carrier density is reported.

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https://infoscience.epfl.ch/entities/publication/54421218-1de0-4e9a-adf3-94413d39b93a

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Vincenzo Savona
1997
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/54421218-1de0-4e9a-adf3-94413d39b93a

About this result

Related concepts (32)

Exciton

An exciton is a bound state of an electron and an electron hole which are attracted to each other by the electrostatic Coulomb force. It is an electrically neutral quasiparticle that exists in insulators, semiconductors and some liquids. The exciton is regarded as an elementary excitation of condensed matter that can transport energy without transporting net electric charge. An exciton can form when a material absorbs a photon of higher energy than its bandgap. This excites an electron from the valence band into the conduction band.

Photoluminescence

Photoluminescence (abbreviated as PL) is light emission from any form of matter after the absorption of photons (electromagnetic radiation). It is one of many forms of luminescence (light emission) and is initiated by photoexcitation (i.e. photons that excite electrons to a higher energy level in an atom), hence the prefix photo-. Following excitation, various relaxation processes typically occur in which other photons are re-radiated.

Charge carrier

In physics, a charge carrier is a particle or quasiparticle that is free to move, carrying an electric charge, especially the particles that carry electric charges in electrical conductors. Examples are electrons, ions and holes. The term is used most commonly in solid state physics. In a conducting medium, an electric field can exert force on these free particles, causing a net motion of the particles through the medium; this is what constitutes an electric current.

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Photoluminescence and carrier dynamics in GaAs quantum wells

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