Laser Studies Of Electron-Phonon Interactions In Amorphous Solids: Homogeneous Fluorescence Line-Broadening And Spectral Diffusion

Phaedon Avouris; Alan Campion; M. A. EI-Sayed

doi:10.1117/12.955602

5 December 1977 Laser Studies Of Electron-Phonon Interactions In Amorphous Solids: Homogeneous Fluorescence Line-Broadening And Spectral Diffusion

Phaedon Avouris, Alan Campion, M. A. EI-Sayed

Author Affiliations +

Proceedings Volume 0113, Advances in Laser Spectroscopy I; (1977) https://doi.org/10.1117/12.955602
Event: 21st Annual Technical Symposium, 1977, San Diego, United States

Abstract

We briefly review the areas of luminescence line-broadening and energy transfer in amorphous solids, with particular emphasis on non-resonant phonon-assisted energy transfer between like ions. The laser-induced fluorescence line-narrowing technique is discussed, and the importance of resonant excitation-detection is emphasized. We illustrate the discussion with several examples from our recent work. A two-phonon Raman scattering propess is shown to be the dominant source of homogeneous thermal line-broadening of the ⁵D₀→ ⁷F₀ fluorescence line of Eu³⁺ in a silicate glass, over the temperature range 200-350 K. We have further shown that the scattering efficiency is site-dependent, correlating with the static crystal field strength. Our results on spectral diffusion (energy transfer between like ions having different transition energies) indicate an electric dipole-dipole coupling mechanism between Eu³⁺ ions in a phosphate glass. The phonon involvement was determined to be an intersite two-phonon Raman process, with one-phonon action at each of the two coupled ion sites.

Citation Download Citation

Phaedon Avouris, Alan Campion, and M. A. EI-Sayed "Laser Studies Of Electron-Phonon Interactions In Amorphous Solids: Homogeneous Fluorescence Line-Broadening And Spectral Diffusion", Proc. SPIE 0113, Advances in Laser Spectroscopy I, (5 December 1977); https://doi.org/10.1117/12.955602

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