Polarized Luminescence of Anisotropic Eu3+-Centers in Cubic Crystals of ZrO2-Eu2O3 and CaF2 Solid Solutions

摘要

Using the polarized luminescence of the Eu3+ ion upon selective laser excitation, regularities of formation of the ion surrounding were studied in crystals with the defect fluorite structure, namely, in CaF2 : Eu3+ self-compensated with interstitial F– or compensated with Na+, as well as in ZrO2–Eu2O3 solid solutions. The influence of the defects (F– and Na+) on distortion of the initial crystalline surrounding of a cation site and on the selection rules of the electronic transitions of Eu3+ in the CaF2 structure was found. The method of polarized luminescence was also used for studying the deformation of the local surrounding of cation sites in stabilized zirconium dioxide crystals induced by the martensite cubic-tetragonal transformation. It is shown in this case that the symmetry of surrounding of cation sites results from weak tetragonal and rhombic shifts of the initial cubic surrounding.