The excitation and decay mechanisms of the Yb3+ intra-4f-shell emission are studied in n-type Mow-grown and p-type LPE grown InP:Yb layers by photoconductivity measurements, time-resolved photoluminescence, photoluminescence excitation and emission spectroscopy. Assuming a pseudodonor or pseudo-acceptor-like character of the isoelectronic Yb3+ T,, centre the temperature dependences of the 41-shell transition intensity and lifetime can be consistently explained. Models for the excitation and decay processes of the Yb3+ photoluminescence are proposed.
The 0.5-eV (4000-cm ) emission band in InP:Fe is studied in detail by Fourier-transform infrared photoluminescence (PL), time-resolved PL, and photoluminescence excitation (PLE) spectroscopy.We resolve new fine structures in both the zero-phonon (ZP) lines and in the corresponding phonon sideband. The transient PL signal follows an exponential decay with a time constant of 1.1+0.3 ms. The PLE shows that the 0.5-eV band can be pumped via hole capture of Fe + and even more efficiently by exciting resonantly the charge-transfer states [Fe +( T2), hp], where the hole is bound to Fe +. The results from PLE and the long decay time strongly support the interpretation of the 0.5-eV band as spin-fiip transitions Tq -+ A~of Fe +. We explain the fine structure of the ZP lines by a dynamic Jahn-Teller distortion in the excited state Tz. The decay of the charge-transfer states [Fe +( T2), hq] leaves the Fe + ion in an excited state (Fe +)', which pumps the 0.5-eV emission.
We present Fourier transform infrared photoluminescence (PL) and absorption studies on GaAs:Fe to analyze the origin of the Fe-related emission at 3057 cm−1. Temperature-dependent PL spectra show additional hot lines and a characteristic phonon sideband linked to this Fe-related peak. Time-resolved studies, using the 1.06 μm line of a Nd:YAG laser for excitation, reveal a decay time of 1.9±0.3 ms. The long lifetime and the fine-structure splitting fit a model where the transitions take place between the 4T1 excited state and the 6A1 ground state of Fe3+ (3d5) in tetrahedral environment.
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