Abstract
A single Er3+ centre in CaGdAlO4:Er3+ has been identified to have C4v symmetry from polarized laser selective excitation. This is consistent with isovalent substitution of the Er3+ ions for host crystal Gd3+ ions. Using both optical and infrared absorption and polarized laser excited fluorescence, 59 crystal-field energy levels and their wavefunction symmetries have been identified and used to perform comprehensive single electron crystal-field analyses for the Er3+ ion centre. For excitation of the 4F9/2 multiplet, blue and green upconversion fluorescence is observed. Self-absorption dips recorded in upconversion excitation spectra are indicative of the presence of radiative energy transfer processes.
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