Transition Metal and Rare Earth Compounds: Excited States, Transitions, Interactions I

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Hartmut Yersin, K.L. Bray
Springer Science & Business Media, Jan 12, 2001 - Science - 186 pages
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For a long time, the properties of transition metal and rare earth compounds have fascinated chemists and physicists from a scientific view-point, and more recently also their enormous potential as new materials has been explored. Applications in different fields have already been realized or are under c- rent investigation, for example, new laser materials, IR to visible upconversion systems, compounds for photolithographic processes, systems involving pho- redox processes for solar energy conversion, new photovoltaic devices, chemical sensors, biosensors, electroluminescent devices (OLEDs) for flat panel display systems, supramolecular devices with wide-range definable photophysical properties, materials for energy harvesting, optical information and storage systems, etc. Metal complexes are also highly important in biology and me- cine. Most of the applications mentioned are directly related to the properties of the electronic ground state and the lower-lying excited states. Metal complexes with organic ligands or organometallic compounds exhibit outstanding features as compared to purely organic molecules. For instance, metal compounds can often be prepared and applied in different oxidation states. Furthermore, various types of low-lying electronic excitations can be induced by a suitable choice of ligands, for example, such as metal-centered transitions (MC, e. g. d-d* tran- tion), ligand-centered (LC, e. g. n-n*), metal-to-ligand-charge transfer (MLCT, e. g. d-7r*), intra-ligand-charge-transfer (ILCT) transitions, etc. In particular, the orbitals involved in the resulting lowest excited states determine the photoph- ical and photochemical properties and thus the specific use of the compound.

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About the author (2001)

Hartmut Yersin is Professor at the University in Regensburg, the city which also hosts the headquarter of OSRAM, one of the two leading illumination companies. Various research stays brought him in contact with leading workgroups in East and West. Now his research activities focus upon characterization of emitter materials, transition metal complexes, and theory and development of electroluminescent devices. His projects are awarded large fundings from the German Research Foundation, the Volkswagen Foundation as well as the Federal Ministry of Education and Research.
His close relationships with various institutions have enabled him to recruit a set of pioneering researchers from both industry and universities to cover a broad spectrum of topics ranging from theory to application.