A new branched carbazole derivative, 1,3,5-tris(2-(9-ethylcarbazyl-3)ethylene)benzene (TECEB), was prepared as a hole-transporting material for organic light-emitting devices (OLEDs). TECEB is comparable to 1,4-bis(1-naphthylphenylamino)biphenyl (NPB) in terms of highest-occupied molecular orbital/lowest-unoccupied orbial energy levels, hole-drift mobility, well device performance (maximum luminence about 10 000 cd m-2 and current efficiency 3.27 A-1) standard...

Highly efficient, orange organic light-emitting diodes (OLEDs) fabricated from newly synthesized iridium complexes show a maximum luminance efficiency of 76 cd A−1 and peak power 45 lm W−1. The white OLEDs containing the traditional blue phosphors exhibit extraordinarily high efficiencies external quantum 26%. Detailed facts importance to specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted...

Metal halide perovskite materials have opened up a great opportunity for high-performance optoelectronic devices owing to their extraordinary properties. More than lead ones, stable and nontoxic bismuth perovskites exhibit more promise in future commercialization. In this work, we developed the first time photodetectors based on full-inorganic Cs3Bi2I9-xBrx modulate performance by varying x composition systematically. Among those self-powered photodetectors, Cs3Bi2I6Br3 shows best with...

A group of novel 2-(2′-hydroxyphenyl)benzothiazole derivatives (1–4) with excited-state intramolecular proton transfer (ESIPT) character were synthesized. Their photophysical properties studied by means steady-state absorption and fluorescence spectra time-resolved emission method as well theoretical calculation in a variety solvents. All these compounds can yield single at the green region nonpolar solvents such n-hexane, while dual consisting blue bands was captured strong polar like...

We report the development of a new type organic semiconductor gas sensor based on porphyrin-based hydrogen-bonded framework (HOF). Owing to orderly porous structures, decoration with rich amino sites and n-type nature, this HOF-based exhibits selective NO2 sensing performance ultra-fast response/recovery rates (17.6 s/15.4 s over 100 ppb) limit detection lower than 40 ppb, together high sensitivity, good reproducibility, long-term stability at room temperature. This study demonstrates that...

Neuromorphic visual systems can emulate biological retinal to perceive information under different levels of illumination, making them have considerable potential for future intelligent vehicles and vision automation. However, the complex circuits high operating voltages conventional artificial present great challenges device integration power consumption. Here, bioinspired synaptic transistors based on organic single crystal phototransistors are reported, which exhibit excitation inhibition...

Abstract Organic photoelectric neuromorphic devices that mimic the brain are widely explored for advanced perceptual computing. However, current individual synaptic mainly focus on utilizing linear models to process optoelectronic signals, which means there is a lack of effective response nonlinear structural information from real world, severely limiting computational efficiency and adaptability networks static dynamic information. Here, feedforward photoadaptive organic transistor with...

A natural, effective, and inexpensive hindered phenolic antioxidant mixture was prepared by blending lignin into quercetin. The performance of quercetin analyzed determining the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging capacity a low-cost high-efficiency ratio found to be 4:1 (w/w). After UV radiation for 4 h, DPPH quercetin/lignin decreased only 13.8%, while that 42.9% 28.6%, respectively. fluorescence analysis indicated molecules inserted weaken its aggregation form new...

Four heteroleptic bis-cyclometalated iridium(III) complexes containing 2-aryl-benzothiazole ligands, in which the aryl is dibenzofuran-2-yl [Ir(O-bt)2(acac)], dibenzothiophene-2-yl [Ir(S-bt)2(acac)], dibenzothiophene-S,S-dioxide-2-yl [Ir(SO2-bt)2(acac)] and 4-(diphenylphosphoryl)phenyl [Ir(PO-bt)2(acac)], have been synthesized characterized for use organic light-emitting diodes (OLEDs). These emit bright yellow (551 nm) to orange-red (598 phosphorescence at room temperature, peak wavelengths...

By adjusting the <italic>para</italic>-, <italic>meta</italic>-, and <italic>ortho</italic>-linking styles of p-type n-type units, physical parameters bipolar host materials are regularly tuned to a large extent. The <italic>meta</italic>- <italic>ortho</italic>-linked isomer hosts exhibit excellent performance in blue phosphorescent thermally activated delayed fluorescence organic light-emitting diodes.

3-(1H-Pyrazol-1-yl)pyridine is used as electron-transporting unit to construct bipolar host materials o-CzPyPz, m-CzPyPz, and p-CzPyPz for application in phosphorescent organic light-emitting diodes (PhOLEDs). By varying the ortho-, meta-, or para-linking mode between n-type 3-(1H-pyrazol-1-yl)pyridine p-type carbazole on phenylene bridge, optoelectronic parameters are tuned large extent. The highly twisted o-CzPyPz has high triplet energy of 2.95 eV, while isomer with more coplanar...

One-dimensional metal-oxides (1D-MO) nanostructure has been regarded as one of the most promising candidates for high-performance photodetectors due to their outstanding electronic properties, low-cost and environmental stability. However, current bottlenecks are high energy consumption relatively low sensitivity. Here, Schottky junctions between nanotubes (NTs) FTO were fabricated by electrospinning SnO2 NTs on glass substrate, bias voltage was ∼1.76 V, which can effectively reduce...

Up to now, the most efficient blue phosphorescent organic light-emitting diode (PhOLED) was achieved with a maximum external quantum efficiency (ηext) of 34.1% by using an exciplex cohost. It still remains challenge obtain such high efficiencies single-host matrix. In this work, highly sky-blue PhOLED is successfully fabricated newly developed bipolar host material, namely 5-(2-(9H-[3,9′-bicarbazol]-9-yl)phenyl)nicotinonitrile (o-PyCNBCz), which realizes ηext 29.4% at practical luminance 100...

Dendrimers are now an important class of materials for use in organic light-emitting diodes (OLEDs). In this Highlight, we make a brief summary the recent advances on OLEDs by using dendrimers as active materials. particular, will focus several issues related to both intrinsic structural features and properties, including dendrimer generation charge mobility, site isolation effect prevention energy transfer, host-free character. The potential applications white electroluminescence via simple...

Homoleptic tris-cyclometalated iridium(III) complexes containing 2-phenylbenzothiazole derivatives as ligands have been successfully synthesized and characterized for the first time. Electron-donating (CH3, OCH3) -withdrawing groups (F) were introduced into 6-position of benzothiazole moiety in to verify their influence on optical electronic properties complexes. Organic light-emitting diodes using these iridium doped emitters exhibited orange electrophosphorescence with excellent...

Two homoleptic and heteroleptic cyclometalated iridium complexes containing the 2-phenylbenzothiozole derivative as main ligand, 1 2, have been synthesized characterized efficient orange-red phosphors. Triarylamine was introduced an important substituent into 6-position of benzothiazole ring to tune photonic electronic properties these complexes. Different from most small molecular complexes, 2 are solution-processable their neat films can be obtained by a spin-coating method. Furthermore,...

Abstract The synthesis and photophysics of two novel 2‐(2′‐hydroxyphenyl)benzothiazole (HBT) derivatives are presented. electron‐withdrawing trifluoromethyl (CF 3 ) group in compound 1 facilitates the deprotonation phenolic hydroxy group. Well‐resolved triple fluorescence from enol, keto, anion, which ranges 350 to 600 nm, was detected for ethanol, marks first time an excited‐state intramolecular proton transfer (ESIPT) molecule has been reported. Both triphenylamine CF were introduced into...

The direct linking of dual n-type units is developed to design novel host materials for improved performance blue and green phosphorescent organic light-emitting diodes.