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Articles you may be interested inEffect of donor-acceptor concentration ratios on nonradiative energy transfer in closely packed CdTe quantum dots Appl. Phys. Lett. 95, 133123 (2009);

The formation of donor–acceptor pairs was detected by perturbed γγ angular correlation spectroscopy. In ZnSe, ZnTe, and CdTe crystals doped with the donor 111In and one of the acceptors N, P, As, or Sb the strength of the electric field gradient shows a systematic correlation of the bond length between the respective acceptor and the neighboring cation. For N acceptors, an inward relaxation of the neighboring cations is concluded to occur.

By means of perturbed ␥␥ angular correlation ͑PAC͒ experiments using the radioactive dopants 77 Br, 111 Ag, and 111 In, the behavior of the group-I elements Li, Cu, Ag, and Au is investigated. Group-I elements are shown to form nearest-͑NN͒ and next-nearest-neighbor donor-acceptor pairs in the II-VI semiconductor CdTe. The simultaneous occurrence of cation vacancies indicates the transition of group-I elements from substitutional to interstitial lattice sites. In case of NN pairs, the electric-field gradients measured in the PAC experiments are compared with those obtained theoretically by density-functional theory calculations. PAC experiments performed in ZnTe and ZnSe show a similar behavior regarding the donor-acceptor pairing with group-I elements in these compounds.