Luminescent europium(iii)–β-diketonate complexes hosted in nanozeolite L as turn-on sensors for detecting basic molecules

Abstract

The luminescence efficiency of Eu(3+)-β-diketonate complexes entrapped within the channels of nanozeolite L is severely decreased by the acidic environment in the channels. The neutralization of the acid sites can remarkably increase the luminescence efficiency due to the formation of complexes with high coordination numbers. Herein we report a simple, effective and robust luminescent sensor for detecting basic molecules (such as amines) based on the above observations.

Photo- and thermo-stable luminescent nanocomposite resulting from hybridization of Eu(III)-β-diketonate complexes with laponite

“…We have reported the encapsulation of lanthanide complexes within the channels of zeolite L crystals and interesting results have been achieved [15,23e26]. The photo- [23] and thermo-stability [26] of lanthanide complexes were obviously enhanced after insertion into the channels of zeolite L; dense, homogeneous, well-oriented, stable, and highly organized luminescent monolayer of zeolite L were obtained with a functional linker, the emitting color of the monolayers can be fine-tuned [25]; the proton strength in channels of zeolite L was also probed by the luminescence feature of the encapsulated Eu 3þ -b-diketonate complexes [18,27] and the corresponding nanocomposites have been successfully used to detect basic molecules [28]. However, one of the problems using zeolites as the matrices is that the spaces where the guest species are accommodated are believed to be rigid and could not be adjusted according to the size of the accommodated guest species.…”

Electrochemical luminescence modulation in a Eu(iii) complex-modified TiO2 electrode

“…[23][24][25][26] Various methods of achieving this immobilization have been reported, but most have typically been based on FRET from a host material such as nanocrystalline titania microspheres, 27-30 clay 31-33 and zeolite [34][35][36][37] to luminescent species such as Eu(III) ion. However, the lower energy transfer efficiency of these materials makes it difficult to achieve a large on-off emission contrast.…”

Faster Synthesis of Beta-Diketonate Ternary Europium Complexes: Elapsed Times & Reaction Yields

“…In particular, β-diketonate ligands have proved to be efficient antennae leading to highly efficient complexes, with relevant and unique applications such as in emitting layers to fabricate white organic light-emitting diodes (WOLED)[ 7 ]; as triple-layer organic light emitting diodes (OLED) in UV portable dosimeter [ 8 ]; as red phosphors applied in light-emitting diodes (LED)[ 9 – 12 ]; as turn-on sensors for detecting basic molecules hosted in nanozeolite [ 13 ], as surfactant functionalized in polymer for luminescence integration [ 14 ], as highly sensitive temperature sensors [ 15 ], as two-photon sensitized luminescent probes for applications in biological imaging [ 16 ], etc.…”