Gd3+ sensitized enhanced green luminescence in Gd:Tb(Sal)3Phen complex in PVA

Ternary and tertiary complexes of Tb(Sal)(3)Phen and Gd:Tb(Sal)(3)Phen were synthesized and characterized in PVA polymer. The structural properties of these systems were evaluated on the basis of NMR and FT-IR techniques. The absorption, excitation and emissive properties of the Tb(3+) ion were improved when coordinated with Sal and Phen ligands. Photoluminescence properties of the complexes in solution, crystals and dispersed in PVA film were explored in steady state and in time domain. Selective excitations (487, 355, 310 and 266 nm) of Tb(3+), Sal and Gd(3+) ions reveal an intramolecular energy transfer process. The emission of Gd:Tb(Sal)(3)Phen complex in PVA indicates the contribution of Gd(3+) ion to enhance the emission intensity of Tb(3+) ion. On the basis of these investigations, photophysics was widely discussed in terms of energy transfer and encapsulation effect.