Zusammenfassung
The anhydrous CeX3 solids with X = Cl, Br, I show two emission bands which are separated by ca. 2000 cm(-1) due to spin-orbit coupling. The longer-wavelength maximum appears at = 362 nm for CeCl3, 390 nm for CeBr3 and 514 nm for CeI3. It is suggested that this red shift is caused by an increasing interaction of the cerium 5d orbitals with the halide nd orbitals. Accordingly, the emission ...
Zusammenfassung
The anhydrous CeX3 solids with X = Cl, Br, I show two emission bands which are separated by ca. 2000 cm(-1) due to spin-orbit coupling. The longer-wavelength maximum appears at = 362 nm for CeCl3, 390 nm for CeBr3 and 514 nm for CeI3. It is suggested that this red shift is caused by an increasing interaction of the cerium 5d orbitals with the halide nd orbitals. Accordingly, the emission originates from a metal-centered 4f5d excited state which is mixed with a cerium 4f -> halide nd MLCT state. (c) 2005 Elsevier B.V. All rights reserved.
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