Synthesis and Electroluminescence of New Polyfluorene Copolymers with Phenothiazine Derivative. Their Application in White-Light-Emitting Diodes

Phenothiazine and triphenylamine-based fluorescent Schiff bases for the dual application of white light generation and H2O2 sensing

Two simple Schiff bases applied for white light emission in an ionic liquid medium and peroxide sensing with an exceptional LOD.

Second Near-Infrared Aggregation-Induced Emission Fluorophores with Phenothiazine Derivatives as the Donor and 6,7-Diphenyl-[1,2,5]Thiadiazolo[3,4-g]Quinoxaline as the Acceptor for In Vivo Imaging

Traditional organic fluorophores generally have hydrophobic conjugated backbones and exhibit an aggregation-caused quenching emission property, which limits greatly their applications in the biological field. Aggregation-induced emission (AIE) fluorophores can breakthrough this shortcoming and are more promising in biological imaging. In this paper, we synthesized three novel donor-acceptor-donor-type second near-infrared (NIR-II) fluorophores and studied their geometric and electronic structures and photophysical properties by both theoretical and experimental studies. All the three fluorophores had typical AIE characteristics, and their emission wavelength spanned the traditional near-infrared and NIR-II regions. They exhibited much stronger fluorescence after being encapsulated in polymer nanoparticles (NPs) than in solutions, and the fluorophore-loaded NPs had desirable biosafety and significant tumor accumulation, indicating that they have great application potentials in tumor detection.

White light emitting diode based on purely organic fluorescent to modern thermally activated delayed fluorescence (TADF) and perovskite materials

White organic/polymer light emitting diode (WOLED/WPLED) processed from solution has attracted significant research interest in recent years due to their low device production cost, device flexibility, easy fabrication over large area including roll to roll and ability to print in various designs and shapes providing enormous design possibilities. Although WOLEDs fabricated using solution process lack their thermally evaporated counterparts in terms of device efficiency, remarkable progress has been made in this regard in recent years by utilizing new materials and device structures. In the present review, we have summarized and extrapolated an excellent association of old and modern concept of cost-effective materials and device structure for realization of white light. In particular, this article demonstrated and focused on design, and development of novel synthesis strategy, mechanistic insights and device engineering for solution process low cost WOLEDs device. Herein, an overview of the prevailing routes towards white light emitting devices (WLEDs) and corresponding materials used, including polymer based WLED, small molecules emitters based thermally activated delayed fluorescence (TADF), perovskite light-emitting diodes (PeLEDs) and hybrid materials based LEDs, color down-converting coatings with corresponding best efficiencies ever realized. We presume that this exhaustive review on WLEDs will offer a broad overview of the latest developments on white SSL and stonework the approach en route for innovations in the immediate future.

Phenothiazine electrophores immobilized on periodic mesoporous organosilicas by ion exchange

Two different phenothiazines carrying quaternary ammonium groups in the side chain have been synthesized and fully characterized.

Facile synthesis of triphenylamine and phenothiazine-based Schiff bases for aggregation-induced enhanced emission, white light generation, and highly selective and sensitive copper(ii) sensing

Facile synthesis of triphenylamine and phenothiazine based Schiff bases for multiple applicability, viz., in AIEE, WLE and Cu²⁺ sensing.

High-color-quality white electroluminescence and amplified spontaneous emission from a star-shaped single-polymer system with simultaneous three-color emission

A star-shaped single-polymer system with simultaneous RGB emission has been developed, achieving high-color-quality saturated white electroluminescence.

White electroluminescence from a single polymer system: phenothiazine derivatives as a red emissive dopant and polyfluorene as a blue host

Photo physical studies of organic light emitting copolymers and their ordered supramolecular self-assembly: tuning the electroluminescence properties with high efficient white light.

White light-emitting diodes based on an all-phosphorescent supramolecular polymer

Novel white light-emitting supramolecular phosphorescent polymers were first synthesized through an efficient host–guest interaction, and their performances can be readily adjusted by varying the monomer ratio. The present work provides an effective way to afford high-performance solution-processable white electroluminescent emitters.

A peptide based two component white light emitting system

A peptide based two component white light emitting system has been designed and developed on the basis of a co-assembly of a PDI containing peptide system as an acceptor and a stilbene containing peptide system as a donor in organic solvents.

t-Bu3P-Coordinated 2-Phenylaniline-Based Palladacycle Complex as a Precatalyst for the Suzuki Cross-coupling Polymerization of Aryl Dibromides with Aryldiboronic Acids

t -Bu₃P-Coordinated 2-phenylaniline-based palladacycle complex, [2'-(amino-kN)[1,1'-biphenyl]-2-yl-kC]chloro(tri-t-butylphosphine)palladium, as a general, highly efficient precatalyst for the Suzuki cross-coupling polymerization of aryl dibromides with aryldiboronic acids is described. Such t-Bu₃P-coordinated 2-aminobiphenyl-based palladacycle complex-catalyzed Suzuki cross-coupling polymerization afforded polymers within an hour, with the yields and the molecular weights comparable to or higher than that of polymers obtained by using other palladium catalysts with much longer polymerization time. Our study provided a highly efficient catalyst system for the Suzuki cross-coupling polymerization of aryl dihalides with aryldiboronic acids. Our study also paved the road for us to investigate other monodentate ligand-coordinated palladacycle complexes including N-heterocyclic carbine-coordinated ones for cross-coupling polymerizations.

Catalysts for suzuki polycondensation: ionic and "quasi-ionic" amphipathic palladium complexes with self-phase-transfer features

Poly(9,9-dioctylfluorene) (PFO) with M(n) values above 100,000 g mol(-1) in a toluene/water system and M(n) values up to 600,000 g mol(-1) in a THF/water system has been obtained by improved Suzuki polycondensation using a new kind of amphipathic palladium catalyst with self-phase-transfer features, which could overcome the disadvantage caused by the immiscible biphasic mixture and accelerate the transmetalation step.

catena-Poly[[[triaqua-cobalt(II)]-μ-10-methyl-phenothia-zine-3,7-dicarboxyl-ato] monohydrate]

The polymeric title compound, {[Co(C(15)H(9)NO(4)S)(H(2)O)(3)]·H(2)O}(n), consists of chains along [001] made up from Co(2+) ions bridged by 10-methyl-phenothia-zine-3,7-dicarboxyl-ate anions. The Co(2+) ion, coordinated by three O atoms from two different carboxyl-ate groups and three water mol-ecules, displays a distorted octa-hedral environment. In the crystal, π-π inter-chain inter-actions, with centroid-centroid distances of 3.656 (2) and 3.669 (2) Å between the benzene rings of the ligands, assemble the chains into sheets parallel to (100). O-H⋯O hydrogen-bonding inter-actions between the coordinating water mol-ecules and carboxyl-ate O atoms link the sheets into a three-dimensional network.

Solar-energy production and energy-efficient lighting: photovoltaic devices and white-light-emitting diodes using poly(2,7-fluorene), poly(2,7-carbazole), and poly(2,7-dibenzosilole) derivatives

World energy needs grow each year. To address global warming and climate changes the search for renewable energy sources with limited greenhouse gas emissions and the development of energy-efficient lighting devices are underway. This Review reports recent progress made in the synthesis and characterization of conjugated polymers based on bridged phenylenes, namely, poly(2,7-fluorene)s, poly(2,7-carbazole)s, and poly(2,7-dibenzosilole)s, for applications in solar cells and white-light-emitting diodes. The main strategies and remaining challenges in the development of reliable and low-cost renewable sources of energy and energy-saving lighting devices are discussed.

Direct white light photoluminescent nanoparticles with one fluorophore

Aggregation of Rhodamine B (RhB) fluorophore in confined nanoscale domains changes the photoluminescence behavior of RhB in core-shell silica/PGMA-RhB nanoparticles. Under an excitation at 365 nm, silica/PGMA-RhB nanoparticles exhibit a two-band emission of yellow and blue in a tetrahydrofuran (THF) solution, compared to the yellow emission of RhB in a THF solution. The yellow and blue emissions of silica/PGMA-RhB nanoparticles are of approximately equal intensity, and mix together to show white light emission from the core-shell nanoparticles. Removal of the silica core from the core-shell nanoparticles does not alter its photoluminescence behavior. Therefore, the white light emission of RhB in the nanoparticles originates from the aggregation of RhB molecules in a nanoscale domain. This finding provides a new and convenient approach to the preparation of white light photoluminescent materials.

White-light emitting hydrogen-bonded supramolecular copolymers based on pi-conjugated oligomers

Three different pi-conjugated oligomers (a blue-emitting oligofluorene, a green-emitting oligo(phenylene vinylene), and a red-emitting perylene bisimide) have been functionalized with self-complementary quadruple hydrogen bonding ureidopyrimidinone (UPy) units at both ends. The molecules self-assemble in solution and in the bulk, forming supramolecular polymers. When mixed together in solution, random noncovalent copolymers are formed that contain all three types of chromophores, resulting in energy transfer upon excitation of the oligofluorene energy donor. At a certain mixing ratio, a white emissive supramolecular polymer can be created in solution. In contrast to their unfunctionalized counterparts, bis-UPy-chromophores can easily be deposited as smooth thin films on surfaces by spin coating. No phase separation is observed in these films, and energy transfer is much more efficient than in solution, giving rise to white fluorescence at much lower ratios of energy acceptor to donor. Light emitting diodes based on these supramolecular polymers have been prepared from all three types of pure materials, yielding blue, green, and red devices, respectively. At appropriate mixing ratios of these three compounds, white electroluminescence is observed. This approach yields a toolbox of molecules that can be easily used to construct pi-conjugated supramolecular polymers with a variety of compositions, high solution viscosities, and tuneable emission colors.