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Triplet emitter materials present attractive possibilities for optimizations of organic/organometallic light emitting diodes (OLEDs). This is due to the significantly higher efficiencies obtainable with these compounds as compared to organic emitters. In this contribution, first a schematic introduction is given, how an OLED device is built-up and why multi-layer structures are preferred. Then a basic...
The photoluminescent properties of mono- and polynuclear cyclometalated platinum(II) complexes are discussed. Spectroscopic studies have revealed weak intra- or intermolecular metal-metal and ligand-ligand interactions that are affected by the molecular structure and microenvironment. The structure-emission relationships observed in these platinum(II) complexes are described and comparisons with palladium(II)...
Excitation energy transfer processes play an important role in many areas of physics, chemistry and biology. The three-dimensional oxalate networks of composition [MIII(bpy)3][MIM′III(ox)3]ClO4 (bpy=2,2′-bipyridine, ox=oxalate, MI=alkali ion) allow for a variety of combinations of different transition metal ions. The combination with chromium(III) on both the tris-bipyridine as well as the tris-oxalate...
Nitronyl nitroxides are stable free radicals that have been used to prepare new molecular solids with intriguing magnetic properties. These properties have been probed for the electronic ground state using a large number of different physical techniques and theoretical methods. In contrast, the excited states and optical spectroscopy of these compounds and their metal complexes have received little...
The most significant developments in quantum chemistry and wave packet dynamics providing the theoretical tools to study the electronic spectroscopy and photoreactivity of transition metal complexes are presented. The difficulties inherent to this class of molecules as well as the degree of maturity of the computational methods are discussed. Recent applications in transition metal coordination chemistry...
The Ln3+ ion is situated at a site of octahedral symmetry in crystals of the lanthanide elpasolites, M2ALnX6. The syntheses and crystal structures of M2ALnX6 are described, with particular reference to phase transitions. The centrosymmetric environment of Ln3+ confers different spectral properties than are observed for most solid-state lanthanide ion systems, and the selection rules are deduced. The...
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