Sensitization of Luminescence of Europium Compounds on Solid Matrices by Terbium (III) Ions

Abstract

The conditions of sensitization of the luminescence of Eu(III) by Tb(III) ions in complexes with inorganic (Na2WO4) and organic (nalidixic acid) ligands in sorbates on solid matrices (zeolite CaX and crystalline zirconium phosphate (ZrP)) and in coprecipitation with CaWO4 have been investigated. It has been established that the maximum sensitization of the europium luminescence is attained in the case where Eu and Tb are present in a 1:0.5 ratio. In this case, the integral intensity of luminescence of Eu(III) (the band with λmax = 612 nm) in the sorbate of its complex with nalidixic acid on ZrP accounts for more than 60% of the luminescence intensity of the industrial photoluminophor Y2O3:Eu (FL-612) possessing red luminescence, and the intensity of Tb(III) luminescence (the band with λmax = 545 nm) accounts for about 40% of the luminescence intensity of the photoluminophor Gd2O2S:Tb possessing green luminescence.