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If we talk about luminescent metal complexes where metal-centered emission is observed, the electric and magnetic fields of large magnitudes may lead to Stark and Zeeman splitting of 2S+1LJ term into 2J+1 sublevels. It means their spectral bands become broader at room temperature and present quite well-resolved sets of sharp peaks at 77K. In case of organic donor-acceptor molecules strong electric field may cause hyperpolarization that affects on energy of electronic states, so some spectral changes can be expected too.

It is remarkable that a suitable material with optimized optical

and magnetic properties is the key to achieve a magneto-optical

interaction successfully due to the fact that the magnetic proper-

ties can make materials respond to external magnetic fields

and then should affect the optical properties of the materials

depending on the magnetic fields. 3d transition metal ions have

attracted considerable attention due to their broadband optical

properties, which is of great significance for wavelength division

multiplexing. However, the outermost d orbital electrons of metal

ions have a strong interaction with their ligand fields,indicating that the transition metal ions are not the ideal emis-sion center for investigating the influence of the magnetic fieldon luminescence. However, the 4f electrons of lanthanide ions

are shielded by their outer electrons with slight effect on theirsurrounding ligand fields and thus can eliminate the influenceof the host. Moreover, the lanthanide ion doped luminescentmaterials are endowed with excellent optical properties. In

particular, europium (Eu3+), one of the most popular luminescent

activators, is suitable for investigating the influence of the

magnetic field on its optical properties due to its excellent optical

performance in the visible band range.