Spectral luminescence properties of nanostructured Ce-Nd-containing silicagel-glasses

Complex Ce4+-Nd3+ centers were formed in silica gel-glasses. These centers were characterized by weak cross-relaxation quenching of luminescence; an i ncreased luminescence branching ratio in the F-4(3/2) --> I-4(11/2), I-4(13 /2) transitions; strong structuring of the analogous spectral bands; and ef fective intracenter sensitization of luminescence. On reducing the Ce4+ ion s to the triply charged state, the structure of the luminescence bands of N d3+ ions became weaker and the ratio of their intensities approached the va lue typical of an Nd-containing silica gel-glass. (C) 2001 MAIK "Nauka/ Int erperiodica".