Nonradiative depletion mechanisms

An Example The Phosphorescence of Dithiosuccinimide Many thio-carbonyls have photostable excited (n > ji ) and (ti —> ti ) states that tend to relax by photophysical rather than photochemical processes.177,178 Recently, the electronic spectra of dithioimides have been under experimental and theoretical investigation.179-181 The spin-forbidden radiative decay of the lowest-lying triplet state of dithiosuccinimide may serve as an example to illustrate the results of the previous sections. Experimentally a lifetime of 0.10 0.01 ms was determined for the Ti state.179 This value has been corrected for solvent effects, but the transition may include radiative as well as nonradiative depletion mechanisms. 

Since carrier heating caused by strong fields is antagonistic to the nonequiUb-rium depletion of the active region, and both processes are proportional to applied fields, in some point their action will become equal and remove the benefits of Auger processes. Besides that, since the main mechanism of nonradiative carrier generation is impact ionization, there is a danger of irreversible breakdown and device destmction. 

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