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Site selective spectroscopy and crystal field analysis of Er3+ in Ca3Ga2Ge3O12 garnet

A detailed study of the optical spectroscopy of Er3+ in Ca3Ga2Ge3O12 crystals is reported. Several site selective techniques were employed (absorption, luminescence, excitation and up-conversion). The combined use of these techniques allowed the separation and classification of the observed spectral lines. Six different Er3+ optical centres are observed. The energy level analysis was performed using a parametric Hamiltonian for the 4f11 electronic configuration of Er3+ in a D2 symmetry site. A set of parameters was obtained by fitting calculated to experimental energy levels for each identified centre. Differences among centres were analysed and related to the different charge compensating mechanisms.