Abstract:

We investigate excitonic polaron states comprising local exciton and longitudinal optical (LO) phonons and decaying of LO phonons. The series from excited polaron states form a group and have essential contribution to the PL spectrum. By mixing of LO phonons with environal phonon modes, this group reduces to a ``zero-phonon line'' (ZPL), Stokes lines (SL) and anti-Stokes lines. This mixing can be coherent and Fano lineshape may appear. The series from the ground polaron state belongs to another group, including ZPL and SL's, with a redshift to the first group.
 
 
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