We present an optical Fourier-transform-infrared photoluminescence (PL) and absorption study of the T2~E internal 3d transitions of Fe + in GaP. We analyze in detail the four zero-phonon lines of Fe + which appear at about 3300 cm in GaP. A fine structure, which originates from diferent iron isotopes, is resolved. Detailed PL and absorption spectra between 2500 and 4200 cm reveal many features in the Stokes and anti-Stokes phonon sidebands. With the help of temperaturedependent absorption measurements we are able to set up the complete level scheme for the internal 3d transitions of Fe + in GaP. We compare the experimental results to theoretical values obtained by crystal-field theory including spin-orbit coupling.
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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