Transition mechanisms and spectral shapes of the 5D0-7F0 line of Eu3+ and Sm2+ in solids -: art. no. 195118

The results of recent ab initio calculations performed by Smentek and Hess for several f-f transitions of Eu3+ in a host of C-2v symmetry are compared with experimental data, and dominant mechanisms of the [D-5](0)-[F-7](0), [D-5](0)-[F-7](1) and [D-5](1)-[F-7](0) optical transitions of Eu3+ and Sm2+ ions are discussed. It is shown that the processes that were treated in the ab initio calculation make only very small contributions in these transitions in actual systems. The difference in the spectral shape of the [D-5](0)-[F-7](0) line between Eu3+ and Sm2+ in glass is explained on the basis of the different dependence of the transition energy on the value of the crystal-field parameter B-20.