JAHN-TELLER EFFECT IN V(4+) DOPED GD3GA5O12 GARNET

We consider the static and dynamic E epsilon and T * epsilon Jahn-Te ller effects in order to analyze the absorption and emission spectra o f octahedrally coordinated V4+ and absorption of tetrahedrally coordin ated V4+. Using two-dimensional configuration coordinate diagrams of o ctahedrally and tetrahedrally coordinated V4+ we are able to explain t he structure of the emission and absorption spectra and the fluorescen ce kinetics measurements of V4+ doped GGG. Our calculations support th e assumption that V4+ in tetrahedral sites is responsible for the addi tional absorption band in the red region.