Eu³⁺-Based Bridged Silsesquioxanes for Transparent Luminescent Solar Concentrators

Abstract

The sol-gel preparation of a bridged silsesquioxane containing europium(III) salts and 2-thenoyltrifluoroacetone has been achieved from a new ethane tetracarboxamide-based organosilane. Free-standing films with thicknesses up to 440 μm and maximum absolute quantum yield (q) of 0.34 ± 0.03 (excitation at 320 nm) were prepared by the drop cast method, while thin films (∼200-400 nm) spin-coated on glass substrates led to highly luminescent coatings with q = 0.60 ± 0.02 (excitation at 345 nm). The thin films were tested as planar luminescent solar concentrators and the optimized device displays an optical conversion efficiency of 12.3% in the absorbing spectral region of the active layer (300-380 nm).

Optical Properties of Hybrid Organic‐Inorganic Materials and their Applications

“…[99,102,104] Moreover, despite the quite limited use of hybrid materials in the fabrication of LSC, their efficiency values are of the same order of magnitude as those of pure organic LSCs. [100] Recent examples of hybrid materials used in LSCs comprise polymers doped with QDs, [105,106] metal halide nanocluster blends [107] and organic dyes, [104] Eu 3+ -based bridged silsesquioxanes, [108][109][110] and di-and tri-ureasils doped with organic dyes and Eu 3+ $-diketonate complexes. [101,[111][112][113] An intriguing example of lightweight and mechanically flexible high-performance waveguiding photovoltaics is the fabrication of cylindrical LSCs of plastic optical fibers (POFs) coated (bulk fibers) or filled (hollow-core fibers) with Rh6G-or Eu 3+ -doped organic-inorganic hybrids ( Figure 8D-G).…”

Enhanced energy transfer efficiency and stability of europium β-diketonate complex in ionic liquid-based lyotropic liquid crystals

“…[1][2][3][4] However, their practical applications are severely restricted due to their poor stability at high temperatures and strong luminescence quenching under long periods of ultraviolet irradiation. They are increasingly being employed in various fields, such as organic light-emission devices (OLEDs), luminescent solar concentrators, and biological fluorescent probes.…”

ALD/MLD fabrication of luminescent Eu-organic hybrid thin films using different aromatic carboxylic acid components with N and O donors

“…In particular, the presence of the bidentate nitrogen donor ligands was found to extend the photoluminescence excitation wavelength range to 6 | RSC Adv., 2016, 00, [1][2][3][4][5] This journal is © The Royal Society of Chemistry 20xx…”

“…The efficiency of the process varies with the nature of the ligand and the bonding between the ligand and the lanthanide ion. Polydentate pyridine carboxylates are particularly promising candidates as sensitizers: [5][6][7] the large lanthanide ions act as hard acids and form strong bonds with ligands having O and N donor atoms such that the resultant hybrids usually exhibit not only high thermal stabilities but also intense photoluminescence.…”