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Optical Spectroscopy

Optical Spectroscopy. Alexander Breindel. What is Optical Spectroscopy?. Spectroscopic techniques using infrared, ultraviolet, and visible light Separating by wavelength allows quantitative analysis Prism Diffraction Grating. Photoluminescence.

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Optical Spectroscopy

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  1. Optical Spectroscopy Alexander Breindel

  2. What is Optical Spectroscopy? • Spectroscopic techniques using infrared, ultraviolet, and visible light • Separating by wavelength allows quantitative analysis • Prism • Diffraction Grating

  3. Photoluminescence • Light emission as a result of excitations from a light source • Electron-hole pair is created by exciting electrons into the conduction band • When the electron-hole pair recombine, there is an emission. Hannewald et al. (2002)

  4. Experiment Setup Laser Lenses Sample Spectrometer

  5. What is Photoluminescence used for? • Photoemission spectrum depends on the band structure • Identify sample composition • Identify defect species and concentration • Characterization of the optical emission properties of the sample

  6. Photoluminescence Excitation • Modification of the Photoluminescence experiment • Measure the intensity at a particular emission energy as a function of excitation energy • Associated with absorption

  7. Example: Perovskite Sample • (C6H5C2H4-NH3)2-PbI4 • Consists of organic and inorganic layers Gauthron et al. (2010)

  8. Results Gauthron et al. (2010)

  9. Results cont. Gauthron et al. (2010)

  10. Image References • K. Hannewald, S. Glutsch, and F. Bechstedt"Theory of photoluminescence excitation spectroscopy in semiconductors"Poster, ICPS 26, Edinburgh (UK), August 2002, Proc. 26th Int. Conf. on the Physics of Semiconductors, Institute of Physics Publ., Bristol, ISBN 0-7503-0924-5 (CD), (2002). • K. Gauthron, J-S. Lauret, L. Doyennette, G. Lanty, A. Al Choueiry, S. J. Zhang, A. Brehier, L. Largeau, O. Mauguin, J. Bloch, and E. Deleporte, "Optical spectroscopy of two-dimensional layered (C6H5C2H4-NH3)2-PbI4perovskite," Opt. Express 18, 5912-5919 (2010) 

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