Red‐emitting tetraphenylethylene derivative with aggregation‐induced enhanced emission for luminescent solar concentrators: A combined experimental and density functional theory study

Abstract

This study examines the use of an aggregation-induced enhanced emission fluorophore (TPE-MRh) to prepare red-emitting luminescent solar concentrators (LSCs) based on poly(methyl methacrylate) (PMMA) and poly(cyclohexyl methacrylate) (PCMA). TPE-MRh is a tetraphenylethylene (TPE) derivative bearing two dimethylamino push groups and a 3-methyl-rhodanine pull moiety, with absorption maxima at around 500 nm and fluorescence peak at 700 nm that strongly increases in solid-state. TPE-MRh displays a typical crystallizationinduced enhanced emission that has been rationalized by modeling the compound behavior in solution and solid-state via density functional theory calculations with the inclusion of the environment. TPE-MRh dispersed into 5 × 5 cm 2 polymer films with a thickness of 25 ± 5 μm has revealed a partial fluorescence quenching with fluorophore content. Quantum yields (QYs) below 10% for the 2 wt.% of doping have been addressed to the formation of less emissive micro-sized clusters of fluorophores. PMMA slabs with the same surface size but 3 mm of thickness and 200 ppm of TPE-MRh have provided QY of 36.5% thanks to the attenuation of the detrimental effects of fluorophore aggregation. This feature is reflected in the LSCs performance, with devices achieving the largest power collected by the photovoltaic cell.

Orange/Red Benzo[1,2-b:4,5-b′]dithiophene 1,1,5,5-Tetraoxide-Based Emitters for Luminescent Solar Concentrators: Effect of Structures on Fluorescence Properties and Device Performances

“…42% at the highest concentration, likely due to inner filter effects combined with the possible formation of less emissive supramolecular (amorphous) chromophoric aggregates. 66 Although these values were inferior to that recorded in toluene (77%), they were still compatible with the fabrication of efficient LSC devices. Slightly lower quantum yields were obtained for emitter BDT-H1 and even BDT-AA , despite the abovementioned formation of micro-aggregates, denoting the excellent light emission properties of the latter compound.…”

Waterborne Acrylic Resin Containing Luminescent Eu3+ Pigments for Luminescent Solar Concentrators

“…The emission quantum yields were determined by using a 152 mm diameter "Quanta-𝜑" integrating sphere, coated with Spectralon in agree-ment with literature reports. [8,9] All measurements were carried out at room temperature. Epifluorescence micrographs were taken on a LED epifluorescence microscope (Schaefer South-East Europe) equipped with a LED blue and green 5 W light source and a DeltaPix Invenio 2EIII microscope camera (DeltaPix).…”

“…The most investigated LSC is based on transparent amorphous polymers like poly(methyl methacrylate) (PMMA) containing the Lumogen F Red 305 (LR) perylene-based fluorophore, [6] and maximum power conversion efficiencies (PCE) of 7.1% was DOI: 10.1002/macp.202200392 reached. High quantum yield (QY) and photostable organic [3,[7][8][9][10][11][12] or inorganic [13][14][15][16][17][18][19][20] luminophores were also studied as effective doping agents. Lanthanide coordination complexes, mainly involving Eu 3+ ions, have recently attracted significant attention due to their high quantum efficiency, photostability, and tunable fluorescence around 600-630 nm that agrees well with the maximum external quantum efficiency of the Si-based PV cells.…”

Oxidization enhances type I ROS generation of AIE-active zwitterionic photosensitizers for photodynamic killing of drug-resistant bacteria

“…[22][23][24][25] Fortunately, aggregate science, represented by the concept of aggregation-induced emission (AIE), shows great potential to address this problem. [26][27][28][29] AIE-active PSs usually exhibit strong emission and an aggregationinduced ROS generation effect and thus provide new opportunities for the development of PDT. 30,31 Recently, although several AIE-active type I PSs have been developed, [32][33][34] there are few reports on how to improve the ROS production efficacy of type I PSs.…”