Metal-mesh is one of the contenders to replace indium tin oxide (ITO) as transparent conductive electrodes (TCEs) for optoelectronic applications. However, considerable surface roughness accompanying metal-mesh type has been root cause electrical short-circuiting devices, such organic light-emitting diode (OLED) and photovoltaic (OPV). In this work, a novel approach making TCE proposed that based on hybrid printing silver (Ag) nanoparticle ink electroplating nickel (Ni). By polishing back...

Poly[(9,9-dioctylfluorenyl-2,7-diyl)-alt(4,4'-(N-(4-butylphenyl)))] (TFB) has been widely used as a hole transport layer (HTL) material in cadmium-based quantum dot light-emitting diodes (QLEDs) because of its high mobility. However, the highest occupied molecular orbital (HOMO) energy level TFB is -5.4 eV, injection from to (QD) higher than 1.5 eV. Such oxidation potential at QD/HTL interface may seriously degrade device lifetime. In addition, not resistant most solvents, which limits...

We report an inverted and multilayer quantum dot light emitting diode (QLED) which boosts high efficiency by tuning the energy band alignment between charge transport layers. The electron layer (ETL) was ZnO nanoparticles (NPs) with optimized doping concentration of cesium azide (CsN3) to effectively reduce flow balance injection. This is virtue a 0.27 eV upshift ETL's conduction edge, inhibits quenching excitons preserves superior emissive properties dots due insulating characteristics...

Sky-blue homoleptic iridium(<sc>iii</sc>) complexes with phenylimidazole ligands show consistent behavior that is linked to their ligand conjugation.

Film morphology has predominant influence on the performance of multilayered organic light-emitting diodes (OLEDs), whereas there is little reported literature from angle molecular level to investigate impact film-forming ability and device performance. In this work, four isomeric cross-linkable electron-transport materials constructed with pyridine, 1,2,4-triazole, vinylbenzyl ether groups were developed for inkjet-printed OLEDs. Their lowest unoccupied orbital (∼3.20 eV) highest occupied...

High-efficiency quantum dot light-emitting diodes (QLEDs) were fabricated using inkjet printing with a novel cross-linkable hole transport material N,N'-(9,9'-spirobi[fluorene]-2,7-diylbis[4,1-phenylene])bis(N-phenyl-4'-vinyl-[1,1'-biphenyl]-4-amine) (SDTF). The cross-linked SDTF film has excellent solvent resistance, high thermal stability, and the highest occupied molecular orbital (HOMO) level of -5.54 eV. inkjet-printed is very smooth uniform, roughness as low 0.37 nm, which comparable...

With the help of photonic sintering using intensive pulse light (IPL), copper has started to replace silver as a printable conductive material for printing electrodes in electronic circuits. However, sinter ink, high energy IPL be used, which often causes electrode destruction, due unreleased stress concentration and massive heat generated. In this study, Cu/Sn hybrid ink been developed by mixing Cu Sn particles. The requires lower than normal successfully employed process make metal-mesh...

A novel cross-linkable electron-transport material has been designed and synthesized for use in the fabrication of solution-processed OLEDs. The exhibits a low LUMO level -3.51 eV, high electron mobility 1.5×10-5 cm2 V-1 s-1 , excellent stability. An average 9.3 % shrinkage film thickness was observed after thermal curing. maximum external quantum efficiency (EQE) 15.6 (35.0 cd A-1 ) achieved blue-phosphorescent OLEDs by spin-coating 13.8 (31.0 an ink-jet-printed device, both which are...

A novel cross-linkable electron transport material, 1,3,5-tris(5-(4-vinylphenyl)pyridin-3-yl)benzene (TV-TmPY), for solution-processing as well a small molecule, 1,3,5-tris(5-phenylpyridin-3-yl)benzene (TmPY), vacuum deposition were designed and synthesized OLEDs. TV-TmPY TmPY with identical core structures are fully characterized to systematically investigate the impact of solution processing on performance phosphorescent Over 90% EQE (external quantum efficiency) was achieved...

A series of cross‐linkable bipolar host materials containing carbazole (donor, D) and 1,2,4‐triazole (acceptor, A) were designed synthesized. The with styryl groups can be thermally cross‐linked by curing at 172–190 °C without any polymerization initiator. Excellent solvent resistance was observed for all the materials, which is beneficial preparation subsequent functional layers solution processes. highest occupied molecular orbital energy levels 5.55, 5.58 5.54 eV are estimated these...

A thin Al2O3 insulating buffer layer deposited on indium tin oxide (ITO) anode by atomic deposition has been investigated for organic light-emitting diodes (OLEDs). With an optimal thickness of 1.4 nm and low density structural defects the film, OLEDs current efficiency power were simultaneously improved 12.5% 23.4%, respectively. The improvements in both mean lower energy loss during holes injection process better balanced charge injection. To understand mechanism behind enhanced...

A novel bipolar host material 9-(3-(5-(4-(diphenylphosphoryl)phenyl)-4-phenyl-4H-1,2,4-triazol-3-yl)phenyl)-9H-carbazole (CTPO) with carbazole, triazole and phosphine oxide moieties was designed synthesized. CTPO found to exhibit a high glass transition temperature (Tg = 127 °C), suitable HOMO LUMO levels (5.65 2.42 eV), triplet energy (3.06 eV) excellent properties. device 15 wt% doping concentration showed low turn-on voltage of 2.5 V maximum current power efficiencies 41.6 cd A−1 43.0 lm...

In conventional quantum dot light-emitting diodes (QLEDs), the organic charge transport materials are susceptible to erosion by water and oxygen, which would reduce efficiency lifetime of devices. Herein, we modified surface hole layer with an ultra-thin Al <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> layer, is deposited using atomic deposition technique, obtain highly efficient...

A simple and low-cost method for improving organic light-emitting diode (OLED) performance by printing poly(3,4-ethylenedioxythiophene) : poly(styrenesulfonate) (PEDOT PSS) grids on the anode is demonstrated. The PEDOT PSS were printed an aerosol jet printer ITO surface. maximum current efficiency of OLED modified with 1.92 times higher than a conventional device. power enhancement factor 2.3 at density 740 mA cm(-2). in can be attributed to light extraction conductivity embedded low-index grids.

Polyethylenimine (PEI) interlayer rinsing with different solvents for inverted organic light emitting diodes (OLEDs) is systematically studied in this paper. In comparison the pristine one, maximum current efficiency (CE max) and power (PE are enhanced by 21% 22% device ethylene glycol monomethyl ether (EEA). Little effect found on work function of PEI rinsed deionized water (DI), ethanol (EtOH), EEA. On other hand, surface morphologies through solvent treatments quite different. Our results...

Abstract The high photovoltaic conversion efficiency (PCE) of ternary organic solar cells (OSCs) based on PTB7-Th, PC 71 BM and IEICO-4F material is obtained, the short-circuit current density ( J SC ), fill factor (FF), open-circuit voltage 25.90 mA cm −2 , 73.20% 0.71 V, respectively. PCE as 13.53%. It highest OSCs materials for all we know. narrow bandgap deposited PTB7-Th:PC bulk heterojunction (BHJ) by layer-by-layer process. We constructed dual active layer both BHJ pseudo-planar...

A printed Al film with low resistance and work function has been demonstrated, which was successfully used as the cathode in OLEDs. The achieved through an precursor ink under sintering temperature (80 °C for 30 s).

The ink jet printing RGB patterning technology (“Printing Technology”) for OLED TV application is gathering momentum toward commercialization. main technical challenges of technology, are (1) to improve the panel performance fabricated by and (2) establish manufacturable G8.5/G11 MURA‐Free technology. Recently, has made tremendous progress in terms material performance( life time, current efficiency, color gamut driving voltage) including optimization top emission device architecture...

Abstract Avobenzone as an ancillary ligand was chosen to construct two yellow iridium(III) complexes, named Irdfppyavo and Irbtavo, [dfppy, bt, avo represent 2‐(2,4‐difluorophenyl)pyridine, 2‐phenylbenzo[ d ]thiazole, avobenzone, respectively], which were thoroughly investigated organic light‐emitting diode dopants. Most importantly, the electroluminescence devices from a luminance of 100–1000 cd m –2 displayed small power efficiency roll‐off values 28.9 21.4 % for respectively.