R. L. Matthews, E. Knobbe
Dec 1, 1993
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Journal
Chemistry of Materials
Abstract
The narrow emission bands of europium (III), particularly the laser-active 610-nm band, make it useful as an optical source. Previous solution studies demonstrated that Eu[sup 3+] chelate complexes have superior fluorescence properties with respect to salts such as EuCl[sub 3] and Eu(NO[sub 3])[sub 3], both of which have recently been doped into gel matrices. To study the liquid-phase and solid-state properties of Eu[sup 3+] complexes relative to EuCl[sub 3], tris(4,4,4-trifluoro-1-(2'-thienyl)-1,3-butane-dionate-O,O') europium(III) dihydrate and piperidinium tetrakis(4,4,4-trifluoro-1-(2'-thienyl)-1,3-butanedionato-O,O') europate(III) were introduced into silica gel by the sol-gel method. The luminescence behavior of the solid-state samples was studied during the sol-gel aging process by means, of absorption, emission, and excitation spectroscopy. The complexes were found to have notably higher quantum efficiencies than EuCl[sub 3], in both solution and the solid state, and their absorption and spontaneous-emission cross-sections were 2-3 orders of magnitude higher. 32 refs., 3 figs., 1 tab.