Tellurium impurity centers in ZnSe were individually probed with time-resolved photoluminescence (PL) spectroscopy. Resolution-limited peaks with an ultralow spatial density originate in the recombination of excitons deeply bound to isolated nearest-neighbor isoelectronic Te pairs (Te2). This interpretation is supported by ab initio calculations. The peaks reveal antibunched photon emission and a doublet structure polarized along  and [1̄ 10]. The temperature dependence of the time-resolved PL decay exposes the dark excitonic states which indirectly affect the radiative recombination of single fine-structure split excitons.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - 2006|