High Pressure Study of Localized States Related to Lanthanide Ions in Solids

Abstract

The latest results on high pressure investigations of luminescence related to Pr 3+ and Eu 2+ in different lattices are presented in this contribution. In the latter case the influence of pressure on anomalous luminescence in Ba x Sr 1-x F 2 for x=0, 0.3 and 0.5 and 1, and the LiBaF 3 :Eu 2+ system as a function of pressure are presented and discussed. A theoretical model describing an impurity trapped exciton as a system where the first carrier is localized at the impurity and the second one is captured by the Coulomb potential at Rydberg-like states is developed. The model is used to analyze the anomalous luminescence in Eu 2+ doped fluorides and pressure quenching of Pr 3+ luminescence in oxides. The model explains the differences in the formation of an impurity trapped exciton in dependence, if the first excited impurity state belongs to 4f n or 4f n-1 5d 1 electronic configurations.

Luminescence of Eu3+ ions in hybrid polymer‐inorganic composites based on poly(methyl methacrylate) and zirconia nanoparticles

“…The problem is solved by introducing lanthanide ions into organic or crystalline matrices. The establishment of a ‘guest–host’ system may significantly increase the luminescent properties of the phosphor due to the partial displacement of the energy levels of ions and indirect excitation using the ‘antenna effect.’ Effective chelate compounds are selected as modification agents of organic matrices. Such chelates can be flavins, pyridines, lipofuscin, polycarboxylic acids, and β‐diketones .…”