Lanthanum lutetium gallium garnets doped with Cr3+ and Nd3+ ions: analysesof elemental composition and energy transfer

A series of experiments was carried out in order to determine the elemental concentration of a sample doped with Cr3+, and to elucidate the nature of the energy transfer process between the Cr3+ and Nd3+ ions in lanthanum lut etium gallium garnets. Elemental concentrations were determined using the i nstrumental neutron activation and X-ray fluorescence techniques. Nature of the energy transfer was studied by obtaining the spectral data on the sing le doped samples with Cr3+ and Nd3+, and on the double doped sample with bo th ions. These data include absorption, luminescence, excitation spectra an d pulsed excitation. The Cr --> Nd transfer efficiency, eta, was quantitati vely determined to be 0.59 at room temperature. (C) 2000 Elsevier Science B .V. All rights reserved.