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Photoluminescence: Analyzing Light Emission Properties

Explore the use of photoluminescence in optical spectroscopy to identify composition, defects, and emission properties of materials. Learn about spectroscopic techniques and photoluminescence excitation for quantitative analysis. Discover how electron-hole pairs and band structures play a role in emission spectra characterization.

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Photoluminescence: Analyzing Light Emission Properties

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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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