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The 4 T 1 (F) → 4 A 2 (F) Luminescence of the Co 2+ (d 7 ) Impurity Centre in Zinc Selenide Crystals
Author(s) -
Goetz G.,
Schulz H.J.
Publication year - 1992
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221690125
Subject(s) - luminescence , impurity , phonon , atomic physics , ion , zinc , analytical chemistry (journal) , coupling constant , absorption spectroscopy , absorption (acoustics) , emission spectrum , physics , chemistry , spectral line , condensed matter physics , optics , chromatography , quantum mechanics , particle physics , astronomy , organic chemistry
Abstract The 4 T 1 (F) → 4 A 2 (F) transition of Co 2+ (d 7 ) ions in ZnSe is detected by its emission at T ≈ 4 K. The no‐phonon line at v̄ = 5558 cm −1 is demonstrated to coincide with the inverse absorption transition. The luminescence shows medium coupling to ZnSe lattice vibrations. An exponential decay with a time constant τ = 100 μs is recorded. A rich fine‐structure is displayed by the 4 T 1 (P) ← 4 A 2 (F) absorption studied for comparison. Qualitatively, it can be described by spin–orbit and Jahn‐Teller interaction. Finally, the properties of two additional emission bands present in the 4200 to 5600 cm −1 region are illustrated, one of them dominated by a no‐phonon line at 5471 cm −1 . Capture of a hole by a neutral donor is discussed as a possible interpretation of a broad luminescence band peaking near 4600 cm −1 .