The luminescence band at 0.95 eV has been identified as originating from the transition within
(SiGaVGaSiGa)
complexes by comparing cathodoluminescence and positron annihilation spectra. The
upper and lower energy levels of the molecule-like defect complexes are suggested to lie at
22 meV below the conduction band and at about 0.5 eV above the valence band,
respectively.