A sharp luminescence line due to the crystal-field transition ( 4 T 1 – 6 A 1 ) of Fe 3+ in the tetrahedral symmetry is observed for the first time in iron-doped I-III-VI 2 chalcopyrite type compounds, CuGaS 2 and CuAlS 2 . The peak energy is 4,942 cm -1 and 5,804 cm -1 respectively. These values are rather small as compared to those in many ferric oxides in which the excitation energy of 4 T 1 in octahedral symmetry is observed around 10,000 cm -1 . The Zeeman effect is also observed and is explained quantitatively by the use of the ligand field theory: We find that g ⊥ of the lowest excited state is zero and the spin-orbit parameter 18 cm -1 .
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Sato et al. (1974) studied this question.
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