A new overview on rare earth diphenylphosphinates: Europium characteristic luminescence of low dimensional nanostructured materials

Abstract

Porous crystalline luminescent polymer compounds have attracted huge interest due to their supramolecular structures, aesthetically attractive structural topologies and potentialities for innovative technological applications. However, wet route precipitation or hydro/solvothermal methods may lead to the formation of highly insoluble porous coordination networks, as is true of europium diphenylphosphinates -[Eu(dpp) 3 ] n . The aim of this work was to study the optical behavior and its relation to the structure of [Eu(dpp) 3 ] n complexes obtained through different synthetic approaches by precipitation: wet route (WRS), ultrasound-assisted wet route (U-WRS), modulator-assisted wet route (M-WRS) and wet route synthesis with solvothermal treatment (S-WRS). These methodologies allowed to synthetize crystalline materials in which both chelate and bridged coordination modes coexist, and they were efficient for obtaining stick-shaped 1D1 nanostructured materials with well-defined optical properties. Changes in precipitation kinetics and crystalline phases formation rate led to a distribution of Eu 3+ ions in higher symmetry sites (HSS). S-WRS, transforming part of the less symmetrical sites into HSS, provided a better ordering of [Eu(dpp) 3 ] n . Furthermore, this is the first report of two or more symmetry sites for Eu 3+ in a pure [Eu(dpp) 3 ] n matrix.

Flexible and color-tunable poly(ether ether ketone) co-coordinated with Eu(III) and Tb(III) fluorescent films: Thermal stability and luminescence property

“…As shown in the inset of Figure 5(a), 5 D 0 → 7 F 1 transition at 592 nm of Eu 3+ ions followed magnetic dipole rules and the corresponding fluorescence intensity did not change significantly with the variation of x due to its independence of Eu 3+ ions chemical environment. 33,34 As a contrast, 5 D 0 → 7 F 2 transition at 616 nm, obeying the electric dipole mechanism, was very sensitive to the chemical environment of Eu 3+ ions and the properties of ligands, and its intensity was directly proportional to the Judd Ofelt Ω 2 parameter. 34…”

“…33,34 As a contrast, 5 D 0 → 7 F 2 transition at 616 nm, obeying the electric dipole mechanism, was very sensitive to the chemical environment of Eu 3+ ions and the properties of ligands, and its intensity was directly proportional to the Judd Ofelt Ω 2 parameter. 34…”

Metal–Organic Frameworks Based on Group 3 and 4 Metals

“…Taking advantage of unique fluorescence properties of rare earth (RE) elements including yttrium and lanthanides, RE-MOFs have been applied in broad applications, such as light emitting, [72][73][74][75][76][77][78][79][80][81][82][83][84][85][86][87][88] sensing, [89][90][91][92][93][94] catalysis, [95][96][97] and imaging [98][99][100][101][102] (Figure 3).…”

Redes metalo-orgânicas contendo íons lantanídeos: MOFs e LOFs

“…Em particular, suas propriedades luminescentes, conferidas pelas intensas e estreitas bandas de emissão, resultantes de transições do tipo f-f, geram cores específicas em dispositivos luminescentes. 42,43 Assim, materiais luminescentes contendo terras raras possuem extensa aplicação em dispositivos de iluminação, como displays emissores e lâmpadas fluorescentes, 44,45 sendo extensamente processados na forma de luminóforos de estado sólido, [46][47][48][49][50][51][52][53][54][55][56][57][58][59][60] materiais híbridos e compostos de coordenação, [61][62][63][64][65][66][67][68][69] vidros, 70 de mercúrio e, assim, evitar a perda de mercúrio da lâmpada e a redução da saída de luminosidade da lâmpada. A camada de barreira também melhora a eficiência da lâmpada, refletindo a luz UV que passa através da camada de material fosfórico para a camada de vidro.…”