Organic light-emitting diodes (OLEDs) based on vacuum deposited small molecules have undergone significant progress since the first efficient double-layered OLEDs were reported in 1987 by Tang and Van Slyke. Recently, solution processed molecular are also drawing more research attention, as such a technology combines advantages of facile synthesis low-cost process like polymers. The performance made is gradually catching up with their counterparts. This feature article will review device...

We present here the development of a new solution-processable n-type dopant, N-DMBI. Our experimental results demonstrated that well-known n-channel semiconductor, [6,6]-phenyl C(61) butyric acid methyl ester (PCBM), can be effectively doped with N-DMBI by solution processing; film conductivity is significantly increased doping. utilized this doping for first time to improve air-stability organic thin-film transistors, in which compensate electron traps. successful demonstration using opens...

Abstract Using imidazole‐type ancillary ligands, a new class of cationic iridium complexes ( 1 – 6 ) is prepared, and photophysical electrochemical studies theoretical calculations are performed. Compared with the widely used bpy (2,2′‐bipyridine)‐type ligands can be prepared modified ease, capable blueshifting emission spectra complexes. By tuning conjugation length blue‐green to red emitting obtained. Single‐layer light‐emitting cells (LECs) based on show electroluminescence. High...

The two-dimensional Ruddlesden-Popper (RP) phases are an important class of halide perovskites with versatile optoelectronic properties. So far, only organic-inorganic hybrid RP involving long organic spacers were reported in this class. Here, we report all-inorganic phase lead perovskite, Cs2PbI2Cl2 (1, I4/ mmm space group; a = 5.6385(8) Å, c 18.879(4) Å), synthesized by solid-state method. compound exhibits band gap Eg ∼ 3.04 eV and photoconductivity. We find anomalous evolution Cs2Pb1-...

Degradation of organic thin-film field-effect transistors (OTFTs) with pentacene as the active material has been studied. It was found that mobility device decreased by 30% and on/off current ratio to one fifth after OTFTs had stored in atmosphere for 500 h. Through surface morphology analysis atomic force microscopy absorption infrared spectroscopy, it adsorption H2O on layer main reason degradation. Remarkable improvement performance achieved encapsulation UV curable resin.

Blue-green-emitting cationic iridium complex with high luminescent efficiencies in both solutions and solid-states are essential for high-performance white light-emitting electrochemical cells (LECs). We report here an efficient blue-green-emitting [Ir(dfppz)2(tp-pyim)]PF6, using 1-(2,4-difluorophenyl)-1H-pyrazole (dfppz) as the cyclometalated ligand 2-(1-(4-tritylphenyl)-1H-imidazol-2-yl)pyridine (tp-pyim) ancillary ligand. [Ir(dfppz)2(tp-pyim)]PF6 emits blue-green light a quantum yield of...

Abstract A carbazole‐based diaza[7]helicene, 2,12‐dihexyl‐2,12‐diaza[7]helicene ( 1 ), was synthesized by a photochemical synthesis and its use as deep‐blue dopant emitter in an organic light‐emitting diode (OLED) examined. Compound exhibited good solubility excellent thermal stability with high decomposition temperature T d =372.1 °C) glass‐transition g , up to 203.0 °C). Single‐crystal structural analysis of the crystalline clathrate ) 2 ⋅ cyclohexane along theoretical investigation...

A novel series of solution-processible carbazole-based host materials, 3,6-bis(N-carbazolyl)-N-phenylcarbazole (BCC-36), 3,6-bis(3,6-di-tert-butyl-9-carbazolyl)-N-phenylcarbazole (BTCC-36), 2,7-bis(N-carbazolyl)-N-phenylcarbazole (BCC-27), and 2,7-bis(3,6-di-tert-butyl-9-carbazolyl)-N-phenylcarbazole (BTCC-27), is designed synthesized. Owing to the highly twisted configuration, these hosts exhibit high triplet energy levels (2.90–3.02 eV) glass transition temperatures (147–210 °C). They also...

Orange‐emitting phosphorescent organic light‐emitting diodes (PHOLEDs) are drawing more and attention; however, high‐performance hosts designed for orange PHOLEDs rare. Here, four indolocarbazole/1, 3, 5‐triazine hybrids synthesized to optimize the singlet triplet energies, as well transporting properties, ideal PHOLEDs. By introducing moieties with different electronegativity, a graded reduction of energies is achieved, resulting in minimum injection barrier energy loss. Besides, charge...

Solution-processed metal oxide thin-film transistors (TFTs) operating in enhancement mode are promising for the next-generation flat panel displays. In this work, we report high-mobility TFTs based on SnO2 active layer derived from a soluble tin(II) 2-ethylhexanoate precursor. Densely packed polycrystalline thin films with moderate oxygen vacancies and only few hydroxides obtained via systemically optimizing precursor concentrations processing conditions. The utilization of...

Organic-inorganic hybrid photodetectors attract considerable attention because they can combine the advantages of both organic and inorganic systems. Here, a perovskite compound with broad absorption spectrum high power conversion efficiency is used as photosensitive layer in an organic/inorganic heterojunction photodetector fast response. The sensitivity exceeding 104 obtained at bias 0–4 V. Using tandem light-emitting diode (OLED) light source, we fabricated optocoupler device. achieved...

A novel bipolar host material, which meets the requirements of high triplet energy, good charge carrier transport properties, solubility, and film-forming ability at same time, has been designed synthesized. Utilizing a new compound as high-efficiency solution-processed blue white phosphorescent organic light-emitting diodes (PHOLEDs) have achieved.

Abstract A pyridine‐containing anthracene derivative, 9,10‐bis(3‐(pyridin‐3‐yl)phenyl)anthracene (DPyPA), which comprehensively outperforms the widely used electron‐transport material (ETM), tris(8‐quinolinolato) aluminum (Alq 3 ), is synthesized. DPyPA exhibits ambipolar transport properties, with both electron and hole mobilities of around 10 −3 cm −2 V −1 s ; about two orders magnitude higher than that Alq . The nitrogen atom in pyridine ring coordinates to lithium cations, leads...

Flexible electronics has attracted enormous interest in wearable and human-machine interfacing. Here, a flexible organic tribotronic transistor (FOTT) without top gate electrode been demonstrated. The FOTT is fabricated on polyethylene terephthalate film using the p-type pentacene poly(methyl methacrylate)/Cytop composites as conductive channel dielectric layer, respectively. charge carriers can be modulated by contact electrification between layer mobile triboelectric layer. Based FOTT,...

Electroluminescent properties of a new monoaza[6]helicene as deep-blue light emitters in nondoped and doped OLEDs were investigated.

Abstract Red‐light photodetectors without filters are in urgent need for narrowband applications such as full‐color imaging and multi‐output visible light communication (VLC). However, their development is hindered by the lack of small‐band‐gap response materials. Without wavelength filters, a new type photodetector with simple single‐layer architecture developed, based on stable squarylium dye characterized detectivity peak at 680 nm full width half maximum 80 nm. The device, which exhibits...

The development of pure-blue-to-deep-blue-emitting ionic phosphors is an ultimate challenge for full-color displays and white-light sources. Herein we report two series short-wavelength light-emitting cationic iridium(III) complexes with nonconjugated ancillary cyclometalating ligands, respectively. In the first series, 1-[(diphenylphosphino)methyl]-3-methylimidazolin-2-ylidene-C,C2′ (dppmmi) used as ligand 2-phenylpyridine (ppy), 2-(2,4-difluorophenyl)pyridine (dfppy),...

N-doping is an effective way to increase the electron conductivity of organic semiconductors and achieve ohmic cathode contacts in electronics. To avoid use difficult-to-handle highly reactive n-dopants, air-stable precursors are widely used nowadays, which could decompose release species a subtractive though always with unwanted even harmful byproducts during processing. Here, we show that metals, such as copper, silver gold, free electrons readily presence chelating ligands, irreversible...

Two novel star-shaped host materials for solution processed blue phosphorescent organic light-emitting devices, 9-(5′,5‴-diphenyl[1,1′:3′,1″:3″,1‴:3‴,1⁗-quinquephenyl]-5″-diyl)-9H-carbazole (DQC) and 9,9′-(5′-phenyl[1,1′:3′,1″-terphenyl]-3,5-diyl)bis-9H-carbazole (PTC), were synthesized by the Suzuki coupling reaction. These compounds both exhibited high glass-transition temperatures (Tg ≥ 128 °C) excellent film-forming ability. The nonplanar configuration of DQC PTC limited effective...

In order to study the impacts of precursors on solution-processed metal oxide films and performance their field-effect transistors (FETs), zinc acetate dehydrate four different Sn – tin(II) 2-ethylhexanoate, tin(IV) acetate, chloride isopropoxide were utilized prepare zinc–tin (ZTO) thin by metal–organic decomposition (MOD) sol–gel processes. Through systematic analysis these devices, it is demonstrated that precursors, with molecular geometrical configurations organic ligands, greatly...

Intramolecular π–π stacking interaction in one kind of phosphorescent cationic iridium complexes has been controlled through fluorination the pendant phenyl rings on ancillary ligands. Two blue-green-emitting complexes, [Ir(ppy)2(F2phpzpy)]PF6 (2) and [Ir(ppy)2(F5phpzpy)]PF6 (3), with ligands substituted two five fluorine atoms, respectively, have synthesized compared to parent complex, [Ir(ppy)2(phpzpy)]PF6 (1). Here Hppy is 2-phenylpyridine, F2phpzpy...

A new solution method of Marangoni effect-controlled oriented growth (MOG) to fabricate highly crystals TIPS pentacene.