By Daniel R. Gamelin, Hans U. Gudel (auth.), Prof. Dr. Hartmut Yersin (eds.)
There exists a wide literature at the spectroscopic homes of copper(II) com- nine kilos. this can be because of the simplicity of the d electron configuration, the wide range of stereochemistries that copper(II) compounds can undertake, and the f- xional geometric habit that they usually show . The digital and geometric houses of a molecule are inexorably associated and this is often very true with six-coordinate copper(II) compounds that are topic to a Jahn-T- ler effect.However,the spectral-structural correlations which are occasionally d- wn needs to usually be considered with warning because the info contained in a customary resolution UV-Vis absorption spectrum of a copper(II) compound is restricted. significant spectral-structural correlations may be bought in a similar sequence of compounds the place special spectroscopic facts is offered. within the fol- four– lowing sections such sequence are tested; the six-coordinate CuF and six 2+ Cu(H O) ions doped as impurities in unmarried crystal hosts.Using low tempera- 2 6 ture polarized optical spectroscopy and electron paramagnetic resonance, a really precise photograph might be drawn concerning the geometry of those ions in either their floor and excited digital states. We then examine the spectrosco- cally decided structural information with that acquired from X-ray diffraction or EXAFS measurements.
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Extra info for Transition Metal and Rare Earth Compounds: Excited States, Transitions, Interactions II
The fact that the bulk cooperative luminescence spectrum can be related to microscopic pairwise interactions at all in this homogeneously-doped sample provides a very important insight into the workings of such processes. This result clearly illustrates and generalizes a most basic assertion of the shell model for energy transfer in isotropically-doped solids , namely, that pair effects such as energy transfer, ETU, or cooperative luminescence are dominated by nearest neighbor interactions, even at low concentrations.
In Fig. 16b, the hysteresis temperature dependence in Upconversion Processes in Transition Metal and Rare Earth Metal Systems 39 10% Yb3+ :Cs3Lu2Br9 is compared with the absorption temperature dependence of the same sample. The triangles in the hysteresis data report the hysteresis widths at each temperature, which increase as the temperature is lowered. The dashed line is an arbitrary polynomial fit to the curvature of the absorption data to assist the eye. This same curve is inverted and superimposed on the hysteresis data.
Schematic representation of the sequence of events in a simple three-level photon avalanche excitation mechanism: a nonresonant GSA to generate one ion in level 1; b resonant ESA to generate one ion in level 2; c nonradiative cross relaxation to generate two ions in level 1 Upconversion Processes in Transition Metal and Rare Earth Metal Systems 33 upconversion therefore involves only steps (a) and (b), and is effectively an inefficient GSA/ESA upconversion excitation mechanism. As the pump power increases, the population of level 2 increases with the square of the power, P2, while that of level 1 increases linearly with power.
Transition Metal and Rare Earth Compounds: Excited States, Transitions, Interactions II by Daniel R. Gamelin, Hans U. Gudel (auth.), Prof. Dr. Hartmut Yersin (eds.)