Luminescence of Europium(III) and Terbium(III) Complexes Incorporated in Poly(Vinyl Pyrrolidone) Matrix

Abstract

Lanthanide complexes of europium and terbium ions with hydrogen phthalate [Eu(Hphth) 3 and Tb(Hphth) 3 , respectively, Hphth ) hydrogen phthalate] were incorporated into poly(vinyl pyrrolidone) (PVP) matrix. Transmission electron microscopy (TEM) results showed that the lanthanide complexes, with a mean diameter about 8.0 nm, were dispersed homogeneously in the PVP matrix. The excitation of the Ln(Hphth) 3 -PVP system by UV light resulted in a ligand-to-metal energy transfer and the emission spectra of the complexes displayed characteristic luminescence of the central ions. PVP significantly affected the strength of the hypersensitive transitions ( 5 D 0 f 7 F 2 for Eu 3+ , and 5 D 4 f 7 F 5 for Tb 3+ ) of the complexes. For the mixed complexes containing both Eu 3+ and Tb 3+ as central ions, the luminescent intensity was strongly dependent upon the ratio of the lanthanide ions. Trace amount of Eu 3+ quenched the luminescence of the Tb 3+ , whereas the presence of Tb 3+ enhanced the luminescence of the Eu 3+ , thus demonstrating an important feature of energy transfer from terbium to europium in the mixed complexes.

2‐Thiopheneacetato‐Based One‐Dimensional Coordination Polymer of Tb3+: Enhancement of Terbium‐Centered Luminescence in the Presence of Bidentate Nitrogen Donor Ligands

“…Furthermore, the energy transfer between the lanthanide ions themselves is a nonradiative process and would account for the decrease in the terbium cation emission intensity, particularly when the metal ion concentration is high. [27] In contrast, 3 and 4 exhibit high quantum yields due to the displacement of solvent molecules from the coordination sphere by the bidentate nitrogen donor li-gands. Additionally, the bidentate nitrogen donor present in the coordination sphere of these complexes may also cause energy transfer to the neighboring HTPAC ligand.…”

New hetero-dilanthanide complexes containing Ln1(fod)3 and Ln2(fod)3 fragments (Ln=Pr–Nd; Nd–Sm; Eu–Tb and Ho–Er) linked by bis-diimine bridging ligand

“…This leads to quenching of Tb(III) emission and enhancement of Eu (III)-luminescence in hetero-dilanthanide, Eu-Tb complex 3. Reports of efficient intramolecular Tb(III) → Eu(III) energy transfer in multiple lanthanide systems are available in the literature [11,14,25,26]. The higher intensity of the electric-dipole 5 D 0 → 7 F 2 transition (as compared to magnetic-dipole 5 D 0 → 7 F 1 transition) and stark splitting indicate that the coordination environment around Eu(III) center is asymmetric.…”

320-fold luminescence enhancement of [Ru(dpp)3]Cl2 dispersed on PMMA opal photonic crystals and highly improved oxygen sensing performance

“…It is surprising that the internal quantum efficiency improves 5.36-fold due to largely restrained non-radiative relaxation. Because of the introduction of the PhC solid skeleton, the non-radiative relaxation can be largely restrained 28,29 and a similar phenomenon was also observed in rare earth ions inserted in inverse opal PhCs. 30 Additionally, the influence of photobleaching was also considered and can be ignored due to the short measurement time (Supplementary Fig.…”