Abstract
Fluorescence enhancement of Tb3+ and Eu3+ in aqueous solution has been studied using phenyl phosphonic acid (PPOA), C6H5P (O)(OH) 2 and phenyl phosphinic acid (PPIA), C6H5P (O)(OH) H as ligands. The enhancement, a result of ligand sensitized fluorescence, was observed to be more than two orders of magnitude with these ligands. On addition of trioctyl phosphine oxide (TOPO), a synergistic ligand, Tb3+ and Eu3+ fluorescence were further enhanced in PPIA acid complexes. The Tb3+ and Eu3+ fluorescence in their PPOA complexes were enhanced by over two orders of magnitude, by the addition of La3+; a process known as cofluorescence. The present study demonstrates for the first time cofluorescence in phosphonic ligands. While synergism due to TOPO was observed with PPIA, cofluorescence was observed with PPOA.
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