SPECTROSCOPIC STUDY OF RARE-EARTH CHROMATES - RELATION TO THE STRUCTURE

The luminescence spectra of tile trivalent europium ion embedded in va rious rare earth chromates were analyzed. The spectroscopic data in mo st of chromates are in agreement with tile structural determination bu t for some others the discrepancy between two methods is underlined. E nergy level schemes were deduced from the experimental emission spectr a and the crystal field simulation has been performed. The maximum spl itting of the F-7(1) manifold of the Eu3+ ion as a function of N-v, th e so-called crystal field strength parameter, is given. This allows us to classify the compounds according to their crystal field extent.