Polariton and free-exciton-like photoluminescence in ZnO

Reynolds, D. C.; Look, D. C.; Jogai, B.; Collins, T. C.
December 2001
Applied Physics Letters;12/3/2001, Vol. 79 Issue 23, p3794
Academic Journal
An unusual photoluminescence line X has been observed in ZnO at an energy between that of the common donor-bound excitons (DBEs) and the free excitons (FEs). In the presence of a high carrier concentration, induced by a second below-band gap laser, the DBEs decrease in intensity, due to screening, and both the FEs and X increase. Thus, X has free-exciton, rather than bound-exciton, character. However, its electric-field vector lies in the plane perpendicular to the c axis, as is also found for the DBEs. The appearance of X is discussed in terms of the polariton picture. © 2001 American Institute of Physics.


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