Transcription of Photoluminescence Spectroscopy
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Photoluminescence Spectroscopy
Valence bandexcited statesconduction bandexcitation photonluminescence photonnonradiative relaxationband gap energyelectronsPhotoluminescence SpectroscopyPhysics U600, Adv Lab I Physics of Waves and Optics Summer 2004D. Heiman, Northeastern University, 6/1/2004I. IntroductionIn this experiment, the energy levels in a semiconductor quantum well structure are investigated usingthe technique of Photoluminescence (PL). A laser is used to photoexcite electrons in a GaAssemiconductor and when they spontaneously de-excite they emit luminescence. The luminescence isanalyzed with a spectrometer and the peaks in the spectra represent a direct measure of the energy levelsin the is a popular and useful semiconductor material. The importance of electronic devices using GaAsis second only to devices using the more ubiquitous semiconductor, Si.
valence band excited states conduction band excitation photon luminescence photon nonradiative relaxation band gap energy electrons Photoluminescence Spectroscopy
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