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5 December 1977 Laser Studies Of Electron-Phonon Interactions In Amorphous Solids: Homogeneous Fluorescence Line-Broadening And Spectral Diffusion
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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 5D07F0 fluorescence line of Eu 3+ 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.
© (1977) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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); doi: 10.1117/12.955602; https://doi.org/10.1117/12.955602
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