Magnetic Field Effects on the Luminescence of Transition Metal Complexes

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Abstract
In many crystalline transition metal complexes the radiative deactivation of the lowest excited electronic state is only vibronically allowed. By application of an external magnetic field the deactivation process can become directly allowed without assistance of a vibrational quantum and, thus, the luminescence is blue shifted by the order of one vibrational quantum. Required for this effect is a magnetic-field-induced coupling between the lowest excited electronic state and a second, energetically adjacent excited electronic state of proper symmetry. Several d8− and d6−complex ions are discussed as examples.