Different amounts of Ni-doped TiO(2) (Ni = 0.1 to 10%) powders and thin films were prepared by following a conventional coprecipitation sol-gel dip coating techniques, respectively, at 400 800°C, thoroughly characterized means XRD, FT-IR, FT-Raman, DRS, UV-visible, BET surface area, zeta potential, flat band photocurrent measurement techniques. Photocatalytic abilities evaluated methylene blue (MB) degradation reaction under simulated solar light. Characterization results suggest that as...

The design and regulation of multiple room-temperature phosphorescence (RTP) processes are formidably challenging due to the restrictions imposed by Kasha's rule. Here, we report a general principle for materials that show RTP processes, which is informed our study four compounds where there modulation linker hybridization between donor (D) acceptor (A) groups. Theoretical modeling photophysical experiments demonstrate can be achieved in sp3 C-linked D-A arrest intramolecular electronic...

Multiresonant thermally activated delayed fluorescence (MR-TADF) compounds are attractive as emitters for organic light-emitting diodes (OLEDs) they can simultaneously harvest both singlet and triplet excitons to produce light in the device show very narrow emission spectra, which translates excellent color purity. Here, we report first example of an MR-TADF emitter (DOBDiKTa) that fuses together fragments from two major classes compounds, those containing boron (DOBNA) carbonyl groups...

Different amounts of Fe-doped TiO2 (with 0.1 to 10 wt.% Fe) powders were prepared at temperatures in the range 400 and 800?C following a conventional co-precipitation technique thoroughly characterized by means X-ray diffraction (XRD), Fourier-transform infrared (FT-IR), Raman (FT-Raman), diffuse reflectance spectroscopy (DRS), BET surface area, zeta potential flat band measurements. Photocatalytic ability was evaluated methylene blue (MB) degradation experiments conducted under irradiation...

Organic long-persistent luminescence (OLPL) is one of the most promising methods for long-lived-emission applications. However, present room-temperature OLPL emitters are mainly based on a bimolecular exciplex system which usually needs an expensive small molecule such as 2,8-bis(diphenyl-phosphoryl)dibenzo[b,d]thiophene (PPT) acceptor. In this study, new thermally activated delayed fluorescence (TADF) compound, 3-(4-(9H-carbazol-9-yl)phenyl)acenaphtho[1,2-b]pyrazine-8,9-dicarbonitrile...

Herein, we demonstrate how judicious selection of the donor decorating a central multi-resonant thermally activated delayed fluorescence (MR-TADF) core based on DiKTa can lead to very high-performance OLEDs. By with triphenylamine (TPA) and diphenylamine (DPA), 3TPA-DiKTa 3DPA-DiKTa exhibit bright, narrowband green red emission in doped films, respectively. The OLEDs these emitters showed record-high performance for this family maximum external quantum efficiencies (EQE

Room-temperature phosphorescence (RTP) originating from higher-lying triplet excitons remains a rather rarely documented occurrence for purely organic molecular systems. Here, we report two naphthalene-based RTP luminophores whose emission is enabled by radiative decay of high-lying excitons. In contrast, upon cooling the dominant originates lowest-lying excited state, which manifested red-shifted emission. Photophysical and theoretical studies reveal that unusual results thermally activated...

Corannulene-derived materials have been extensively explored in energy storage and solar cells, however, are rarely documented as emitters light-emitting sensors organic diodes (OLEDs), due to low exciton utilization. Here, we report a family of multi-donor acceptor (multi-D-A) motifs, TCzPhCor, TDMACPhCor, TPXZPhCor, using corannulene the carbazole (Cz), 9,10-dihydro-9,10-dimethylacridine (DMAC), phenoxazine (PXZ) donor, respectively. By decorating with different donors, multiple...

Abstract We report the characterization of rotaxanes based on a carbazole‐benzophenone thermally activated delayed fluorescence luminophore. find that mechanical bond leads to an improvement in key photophysical properties emitter, notably increase photoluminescence quantum yield and decrease energy difference between singlet triplet states, as well fine tuning emission wavelength, feat is difficult achieve when using covalently bound substituents. Computational simulations, supported by...

The successful development of eosin-Y and sulfur-codoped g-C 3 N 4 composite as a highly efficient photocatalyst for the regeneration NADH/NADPH (64.38%/81.14%) light-driven oxidation sulfide to sulfoxide with an yield 99.6%.

Engineering multifunctionality in hybrid polyoxometalates (hybrid POMs) is an interesting but scarcely explored topic. Herein, we set about engineering two important materials properties, viz., photochromism and self-separating catalysis, a POM by modulating the counterion motif. A series of six aromatic sulfonium counterions have been developed on basis motif that allows structural electronic fine-tuning changing substituents at multiple locations. Using sodium molybdate, new octamolybdate...

We report an organic emitter containing a β-triketone electron acceptor core and phenoxazine as the donors (TPXZBM) for solution-processed light-emitting diodes (OLEDs). The resulting molecule is very unusual because it shows both thermally activated delayed fluorescence intramolecular proton transfer. compare its performance with previously reported diketone analogue PXZPDO. Solution-processed OLEDs of PXZPDO TPXZBM show maximum external quantum efficiencies 20.1 12.7%, respectively....

Abstract The S 1 state and high‐lying triplet excited states (Δ E S1Tn ) offer insight into clarifying the mechanism of efficiency roll‐off organic light‐emitting diodes (OLEDs). However, experimental detection Δ is challenging due to Kasha's rule. Here, two emitters, PhCz‐O‐DiKTa PhCz‐DiKTa , showing multi‐resonant thermally activated delayed fluorescence (MR‐TADF) are reported. By modulating conjugation between MR‐TADF DiKTa emissive center donor substituent, emission directly from T 2 for...

Crystal engineering is a green and convenient approach to designing desirable materials through rational manipulation of intermolecular interactions. We have reported the lesser sulfonate–pyridinium interaction for design synthesis organic co-crystals with improved features. Here in we report utilization tune solid-state luminescence precursor naphthalene disulfonic acid (NDSA-2H). Organic salts NDSA-2H are synthesized characterized three isostructural bipyridyl co-formers: 4-phenylpyridine...

We report the use of an extended -conjugated electron-deficient “pyrazino[2,3-g]quinoxaline (PQ)” as a strong, planar acceptor in donor-acceptor thermally activated delayed fluorescence emitter design to achieve deep-red NIR...

Abstract Thermally activated delayed fluorescence (TADF) is an emission mechanism whereby both singlet and triplet excitons can be harvested to produce light. Significant attention devoted developing TADF materials for organic light‐emitting diodes (OLEDs), while their use in other electronics applications such as sensors, has lagged. A family of emitters, TPAPyAP , TPAPyBP TPAPyBPN containing a triphenylamine (TPA) donor differing nitrogen‐containing heterocyclic pyrazine‐based acceptors...

The development of novel metal-free solid-state near-infrared (NIR) emitters is a challenging task. Herein, the facile synthesis two organic NIR emitting at 705 and 673 nm are reported. mechanism emission shown to be an excited-state intramolecular proton transfer through series experiments as well theoretical calculations. X-ray crystallography analyses revealed that unique packing arrangement molecules with slipped face-to-face helps prevent π–π stacking interaction aggregation-caused...

Based on the mechanism of hydrolytic cleavage Schiff bases, a 1-aminopyrene based fluorescent chemodosimeter, 3, is reported for selective detection Nb5+ ions in solution. Among 21 metal tested, chemodosimeter shows fluorogenic 'turn-on' response toward mixed aqueous media.

Bromo-functionalized B1-polycyclic aromatic hydrocarbons (PAHs) with LUMOs of less than -3.0 eV were synthesized and used in cross-couplings to form donor-acceptor materials. These materials spanned a range S1 energies, number showing thermally activated delayed fluorescence significant emission the near-infrared region spectrum. B1-PAHs represent useful family acceptors that can be readily functionalized.

We report rare examples of organic small molecules exhibiting both thermally activated delayed fluorescence (TADF) and wide-ranging piezochromism (Δ λ > 150 nm) in the near-infrared region their utilization deep-red OLEDs.

Modification of a MR-TADF core with mesogenic units allowed for the design liquid crystal exhibiting narrowband sky-blue and self-assembly in columnar mesophase.