Bottleneck in multiphonon nonradiative transitions
- 1 May 1997
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 55 (17), 11006-11009
- https://doi.org/10.1103/physrevb.55.11006
Abstract
The nonradiative decay process of rare-earth ions in solids has been considered up to now to be independent of excitation intensity. In this paper we show that the multiphonon nonradiative decay probabilities of rare-earth ions in a germanate glass are reduced at high excitation state densities for the larger energy gaps. The classical exponential energy gap law is shown to 'rotate' at higher excitation around the 3.2-phonon point. The observed effect is described in terms of a spatial saturation of the accepting mode term with an effective diffusion length ranging between 45 and 20 Å for excited state density from 2× to 8× at an active ion concentration of 2.5× .
Keywords
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