Hexagonal columnar liquid crystals as a processing additive to a P3HT:PCBM photoactive layer

Ahipa, T.N.; Anoop, K M; Pai, Ranjith Krishna

doi:10.1039/c5nj01350j

Cited by 8 publications

(3 citation statements)

References 50 publications

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“…ITO substrate is a popular material that is useful for many opto-electronic applications using different substances and nanoparticles materials [31][32][33]. We used ITO because is an electrode widely used in electrochemistry due to its excellent optic transparence, high electric conductivity, wide work window in electrochemical studies and high physical and electrochemical stability [34,35].…”

Section: Resultsmentioning

confidence: 99%

Control of calcium oxalate morphology through electrocrystallization as an electrochemical approach for preventing pathological disease

Neira-Carrillo

Vásquez-Quitral

Sánchez

et al. 2015

Ionics

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Artículo de publicación ISIPathological crystallization of calcium oxalate (CaOx) inside the urinary tract is called calculi or kidney stone (Urolithiasis). CaOx exhibits three crystalline types in nature: CaOx monohydrate COM, dihydrate COD and trihydrate COT. COD and COM are often found in urinary calculi, particularly COM. Electrocrystallization has been recently used to perform oriented crystallization of inorganic compounds such as Ca-salts. Although many mineralization methods exist, the mechanisms involved in the control of CaOx polymorphism still remain unclear. Herein, we induced selective electrocrystallization of COD by modifying the electrical current, time and electrochemical cell type. By combining above factors, we established an efficient method without the use of additives for stabilizing non-pathological CaOx crystals. We found notorious stabilization of CaOx polymorphisms with hierarchically complex shape with nano-organization assembly, size and aggregated crystalline particles. Our results demonstrated that, by using an optimized electrochemical approach, this technique could have great potential for studying the nucleation and crystal growth of CaOx through functionalized synthetic polymers, and to develop a novel pathway to evaluate new calculi preventing-compound inhibitors

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Section: Resultsmentioning

confidence: 99%

Control of calcium oxalate morphology through electrocrystallization as an electrochemical approach for preventing pathological disease

Neira-Carrillo

Vásquez-Quitral

Sánchez

et al. 2015

Ionics

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“…It has been demonstrated that the efficiency of BHJ OSCs fabricated with P3HT:PCBM is strongly influenced by the deposition technique, blend composition, and post-treatment parameters. − Many studies have been performed to understand and control the undesired morphology and phase separation of the D and A domains, by incorporating additives to the BHJ blend precursor solution. Upon introduction of different processing additives to the cast P3HT:PCBM solution (i.e., trihydrazone-functionalized cyanopyridine (CPTH-D16), 1,8-diiodooctane, and 1,2,4-trichlorobenzene), a significant enhancement in photovoltaic performance has been observed.…”

Section: Part 1 Applications That Take Advantage Of the Tridimensiona...mentioning

confidence: 99%

Conducting Polymers in the Fields of Energy, Environmental Remediation, and Chemical–Chiral Sensors

et al. 2018

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Conducting polymers (CPs), thanks to their unique properties, structures made on-demand, new composite mixtures, and possibility of deposit on a surface by chemical, physical, or electrochemical methodologies, have shown in the last years a renaissance and have been widely used in important fields of chemistry and materials science. Due to the extent of the literature on CPs, this review, after a concise introduction about the interrelationship between electrochemistry and conducting polymers, is focused exclusively on the following applications: energy (energy storage devices and solar cells), use in environmental remediation (anion and cation trapping, electrocatalytic reduction/oxidation of pollutants on CP based electrodes, and adsorption of pollutants) and finally electroanalysis as chemical sensors in solution, gas phase, and chiral molecules. This review is expected to be comprehensive, authoritative, and useful to the chemical community interested in CPs and their applications.

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“…However, in recent years, LC displays are being challenged by new technologies, which have received broad interest from the industry . As a consequence, the semiconductor properties of LCs started to play an important role, extending the application of LCs into optoelectronic devices, such as organic field effect transistors (OFETs), − organic light emitting diodes (OLEDs), − and organic solar cells (OSCs). − In particular, columnar liquid crystals (ColLCs) comprise disk-like shaped molecules that are stacked into columns by strong π–π interactions . In these materials, anisotropic electronic transport occurs preferentially along the columns.…”

Section: Introductionmentioning

confidence: 99%

Delayed Fluorescence by Triplet–Triplet Annihilation from Columnar Liquid Crystal Films

Franca

Santos

Pander

et al. 2022

ACS Appl. Electron. Mater.

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Delayed fluorescence (DF) by triplet–triplet annihilation (TTA) is observed in solutions of a benzoperylene-imidoester mesogen that shows a hexagonal columnar mesophase at room temperature in the neat state. A similar benzoperylene-imide with a slightly smaller HOMO–LUMO gap, that also is hexagonal columnar liquid crystalline at room temperature, does not show DF in solution, and mixtures of the two mesogens show no DF in solution either, because of collisional quenching of the excited triplet states on the imidoester by the imide. In contrast, DF by TTA from the imide but not from the imidoester is observed in condensed films of such mixtures, even though neat films of either single material are not displaying DF. In contrast to the DF from the monomeric imidoester in solution, DF of the imide occurs from dimeric aggregates in the blend films, assisted by the imidoester. Thus, the close contact of intimately stacked molecules of the two different species in the columnar mesophase leads to a unique mesophase-assisted aggregate DF. This constitutes the first observation of DF by TTA from the columnar liquid crystalline state. If the imide is dispersed in films of polybromostyrene, which provides an external heavy-atom effect facilitating triplet formation, DF is also observed. Organic light-emitting diodes (OLEDs) devices incorporating these liquid crystal molecules demonstrated high external quantum efficiency (EQE). On the basis of the literature and to the best of our knowledge, the EQE reported is the highest among nondoped solution-processed OLED devices using a columnar liquid crystal molecule as the emitting layer.

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Hexagonal columnar liquid crystals as a processing additive to a P3HT:PCBM photoactive layer

Cited by 8 publications

References 50 publications

Control of calcium oxalate morphology through electrocrystallization as an electrochemical approach for preventing pathological disease

Control of calcium oxalate morphology through electrocrystallization as an electrochemical approach for preventing pathological disease

Conducting Polymers in the Fields of Energy, Environmental Remediation, and Chemical–Chiral Sensors

Delayed Fluorescence by Triplet–Triplet Annihilation from Columnar Liquid Crystal Films

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