SPECTROSCOPIC PROPERTIES OF FE3-DOPING WITH RARE-EARTH IONS( IN GGG AND THE EFFECT OF CO)

The spectroscopic properties of Fe3+ in tetrahedral d-sites of GGG and the effect of co-doping with Tm3+ are investigated. It is thus shown that a very efficient energy transfer from Fe3+ (d) to Tm3+ takes plac e due to a good superposition of Fe emission and Tm H-3(6)-> H-3(4) ab sorption spectra and due to a favorable packing of the d-sites around the dodecahedral site occupied by Tm. It was also found that the Fe-se nsitized luminescence of Tm has different spectral and temporal charac teristics from the normal emission of this ion in GGG.