New Red Pair Luminescence from GaP

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Abstract
We report optical experiments showing that the low-temperature red luminescence in GaP doped with Cd (or Zn) acceptors arises in two ways: (a) from the recombination of electrons bound to neutral complexes involving Cd (or Zn) and O, with holes trapped at distant Cd (or Zn) acceptors producing pair spectra with novel properties; (b) from the decay of an exciton bound at these complexes, as recently reported by Morgan et al. Zeeman and isotopic shift experiments which provide information about the symmetry axis, electronic structure, and chemical identity of the exciton-impurity complex are also discussed. The concentrations of the neutral complexes in Zn- and Cd-doped GaP have been estimated from absorption measurements using oscillator strengths derived from the measured decay time of the exciton luminescence.

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