Nonradiative Transitions in Semiconductors

Finally nonradiative transitions which are specific for semiconductors are mentioned. In order to do so, we consider a specific radiative transition, viz. the donor-acceptor-pair emission (Sect 3.3.9). In the excited. state the donor and acceptor are occupied (Fig. 4.14). This excited luminescent center may show radiative and nonradiative transitions within the center itself (similar to the discussion in Sect. 4.2). In addition, however, there are other processes which are related to the valence and/or conduction band. 

If the donor is thermally ionized (Fig. 4.14), the luminescence will be quenched unless it is trapped again at a donor site. A different nonradiative mechanism is 

DiBartolo B (ed) (1991) Advances in nonradiative processes in solids. Plenum, New York 

Struck CW, Fonger WH (1991) Understanding luminescence spectra and efficiency using Wp and related functions, Springer, Berlin Heidelberg New York 

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