Lanthanide-cored supramolecular systems with highly efficient light-harvesting dendritic arrays towards tomorrow’s information technology

Abstract

We have developed novel lanthanide-cored supramolecular systems with highly efficient light-harvesting dendritic arrays for integrated planar waveguide-typed amplifiers. Er 3+ ions were encapsulated by the supramolecular ligands, such as porphyrins and macrobicyclics. The supramolecular ligands have been designed and synthesized to provide enough coordination sites for the formation of stable Er(III)-chelated complexes. For getting a higher optical amplification gain, also, the energy levels of the supramolecular ligands were tailored to maintain the effective energy transfer process from supramolecular ligands to erbium(III) ions. Furthermore, to maximize the light-harvesting effect, new aryl ether-functionalized dendrons as photon antennas have been incorporated into lanthanide-cored supramolecular systems. In this paper, molecular design, synthesis and luminescent properties of novel lanthanidecored integrated supramolecular systems with highly efficient light-harvesting dendritic arrays will be discussed.

Fluorescence Quenching of Two Coumarin-3-carboxylic Acids by Trivalent Lanthanide Ions

“…Also, lanthanide complexes of bis-coumarins revealed cytotoxic activity [9], whereas 3-sulfo-4-hydroxycoumarin and bis (4-hydroxy-3-coumarinyl) acetic acid lanthanide complexes exhibited interesting anticoagulant effects [18,19]. Moreover, luminescent lanthanide complexes have raised much interest in a wide range of photonic applications such as planar waveguide amplifiers, plastic lasers, light-emitting diodes, and luminescent probes [15,[20][21][22][23][24][25].…”

Inert and stable erbium(III)-cored complexes based on metalloporphyrins bearing aryl-ether dendron for optical amplification: synthesis and emission enhancement

“…This mixture was purified with a second column (silica, CH 2 Cl 2 /hexane (8:2)) to afford the compound of G2-FB-por (1.150 g, 24%). 1 G2-FB-por (800 mg, 0.28 mmol) and PtCl 2 (183 mg, 0.69 mmol) were suspended in anhydrous benzonitrile (70 mL). The mixture was then purged with N 2 as it was slowly heated to 160 1C.…”

“…Luminescent lanthanide complexes have attracted considerable attention because of their academic interest and potential utility in a wide variety of applications, such as planar waveguide amplifiers, plastic lasers, and light-emitting diodes [1][2][3][4]. In most cases, luminescent lanthanide complexes consist of a lanthanide ion and a chelating luminescent ligand which acts as a sensitizer that transfers excitation energy to the encapsulated lanthanide ion; the presence of this kind of ligand overcomes the lanthanide ion's intrinsically low luminescence intensity by direct excitation of the lanthanide ion having low absorption and emission cross-sections.…”

Self-assembly using dendritic building blocks—towards controllable nanomaterials

“…These complexes have interesting luminescent properties as the dendritic branching can act both as an antenna, funnelling energy absorbed by the branched shell down to the metal ion, but also as a means of isolating the metal ion from its neighbours -hence decreasing quenching and increasing the luminescence intensity [44]. This class of lanthanide complex consequently has potential applications in the development of components for advanced fibreoptics [45]. Smith and co-workers have taken a similar approach to encapsulating lanthanides within a dendritic shell using a dendron based on L-lysine which has a carboxylic-acid group at the focal point [46].…”