Optical detection of magnetic resonance is reported for three distinct zinc-vacancy-zinc-interstitial Frenkel pairs in ZnSe produced by 2.5-MeV electron irradiation at 4.2 K. One is detected as distant-donor-to-Frenkel-pair recombination in luminescence at ∼600 nm. The other two are detected as localized-triplet recombination luminescence at ∼800 nm. The emitting excitonic state is analyzed as a hole on the zinc vacancy with an exchange-coupled electron on the nearby interstitial zinc. From this, the EPR properties of the isolated interstitial zinc donor are deduced.

• Received 13 March 1986

DOI:https://doi.org/10.1103/PhysRevLett.56.2310