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A new zero-phonon line in GaAs:Cr is observed at 0.844 eV. This line is attributed to an internal transition of a Cr2+-Te complex. Photoluminescence excitation experiments are reported for the first time on the 0.839-eV line (Cr2+–X). Comparison of the results on these two centers with those obtained on isolated Cr2+ gives interesting details about the trigonal field at Cr2+–X and Cr2+-Te. Other complexes are not suspected to be observed in luminescence.
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Deveaud et al. (1984) studied this question.
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