Preparation and luminescence properties of ormosil hybrid materials doped with Tb(Tfacac)_3phen complex via a sol-gel process

摘要

In this paper, silica-based transparent organic-inorganic hybrid materials were prepared via the sol-gel process. Tetraethoxysilane (TEOS) and 3-glycidoxypropyltrimethoxysilane (GPTMS) were used as the inorganic and organic precursors, respectively. The terbium complex, Tb(Tfacac)_3phen (Tfacac = 1,1,1-trifluoroacetylacetone, phen = 1, 10-phenanthroline) was successfully doped into organically modified silicate (ormosil) matrix derived from TEOS and GPTMS, and the luminescent properties of the resultant ormosil composite phosphors [ormosil/Tb(Tfacac)_3phen] were investigated compared with those of the Tb(Tfacac)_3phen incorporated into SiO_2 derived from TEOS (labeled as silica/Tb(Tfacac)_3phen). Both kinds of the materials show the characteristic green emission of Tb~(3+) ion. The luminescence behavior of the resultant composite products was dependent on the matrix composition. The optimized lanthanide complex concentration in the ormosil/Tb(Tfacac)_3phen was increased compared with in silica/Tb(Tfacac)_3phen. Furthermore, the lifetime of Tb~(3+) in Tb(Tfacac)_3phen, silica/Tb(Tfacac)_3phen and ormosil/Tb(Tfacac)_3phen follows the sequence: ormosil/Tb(Tfacac)_3phen>silica/Tb(Tfacac)_3phen>pure Tb(Tfacac)_3phen.