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.
valence band excited states conduction band excitation photon luminescence photon nonradiative relaxation band gap energy electrons Photoluminescence Spectroscopy
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