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Two aluminum-related defect spectra in irradiated silicon, All with a no-phonon transition at 0.836 eV and A12 at 0.886 eV, are studied by photoluminescence measurements employing temperature control and perturbation spectroscopy with uniaxial stress and magnetic fields. All is a defect of rhombic I (C2, ) site symmetry, probably incorporating carbon in addition to aluminum. Its optical properties are very similar to those of the Gal and T defects (related to Ga and C or B and C, respectively), suggesting equivalent microscopic structure of the All, Gal, and T defects. For A12, monoclinic I (C») or trigonal (C3") symmetry is found in stress or Zeeman measurements, respectively, with annealing behavior and local modes similar to All.

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