Assemblies, characterization, and luminescent enhancement of organized molecular films based on rare earth complexes

Fluorescence enhancement of europium complex co-doped with terbium complex in a poly(methyl methacrylate) matrix

“…Among these enhancing ion complexes, it can be clearly seen that five ions are arranged in the order of their enhancement factors, terbium, gadolinium, Lanthanum > yttrium, dysprosium > cerium for Eu(DBM) 3 Phen system and that Tb 3+ complex causes the greatest fluorescence enhancement. This is the same as the conclusion reported earlier by Zhong et al [12] and Ci et al [15]. This result tells us that the closer the sizes of rare-earth ions in donor and acceptor complexes are, the more effective the energy transfer.…”

“…The non-fluorescent b-diketone complexes of yttrium, lanthanum, lutetium and gadolinium, and sometimes terbium, can donate energy that they have absorbed to the analogous fluorescent complexes of europium. Within the donating complex, the rareearth ion cannot accept energy from the level of the ligand, but the energy is transferred to the respective fluorescent complex, provided that the complexes are in close proximity, e.g., in an aqueous suspensions, co-precipitates, and LB films, containing a large excess of the donating complex [10][11][12]. This phenomenon was called co-fluorescence, or enhanced luminescence [13][14][15].…”

Assembly of Silver Nanoparticles into Hollow Spheres Using Eu(III) Compound based on Trifluorothenoyl-Acetone

“…The surface plasmon resonant absorption cannot be observed in previous work [17] because the silver hollow spheres are submicrometer and do not consist of silver nanoparticles. At the same time, an observation of the two curves A and B shows the almost same π–π* absorption peak (343.9 and 345.7 nm) of TTA, which is different from previous work [16,18,19]. The result is attributed that the additional free Eu(TTA) 3 · 2H 2 O do not form J-aggregate and only acts as bridge between silver nanoparticles.…”

Luminescent Properties of Europium Complexes with Different Long Chains in Langmuir-Blodgett (LB) Films

“…Since LB technique was introduced to fabricate Eu(III) complexes films [9], many researches have been done to study their luminescence of other materials with Eu(III) complexes composition [10]. As hydrophilic ability of Eu(III) complexes was strong and were hard to form stable film on subphase, ways were done to overcome Eu(III) complexes LB films stability and weak emission strength in films [6][7][8][9][11][12][13]. Mixture system containing complexes and classical film-forming molecules (SA or AA) could form stable Langmuir film at air/water surface and could be fabricated excellent LB films, but film-forming molecules affected emission strength because they were hard to be controlled exact molecular packing in films [14,15].…”