In this study, the fundamental but previously overlooked factors of charge generation efficiency and light extraction (LEE) are explored collaboratively optimized in tandem quantum-dot light-emitting diodes (QLEDs). By spontaneously forming a microstructured interface, bulk-heterojunction-like charge-generation layer composed poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)/ZnO bilayer is fabricated an ideal surpassing 115% obtained. The coupling strength waveguide mode for top unit...

Achieving high-performance electroluminescence with EQE of 7.20% and CIE<italic>y</italic>∼ 0.06 based on bipolar materials intercrossed excited state characteristics.

All-inorganic and low-cost quantum-dot light-emitting diodes (QLEDs) are always desired considering the easy processing outstanding physical chemical stability of inorganic oxides. Herein, efficient all-inorganic QLEDs demonstrated by using NiO ZnO as charge transport layers fabricated via ultrasonic spray processes. Excellent device performance is achieved thanks to introduction an Al2O3 interlayer between quantum dots (QDs) amorphous layer. Transient photoluminescence electricity...

Recently, Apple Inc. launched the highly anticipated cellphone, iPhone X, which adopts an active-matrix organic light-emitting display (AMOLED) for first time.

Abstract Resonance interaction between a molecular transition and confined electromagnetic field can lead to weak or strong light-matter coupling. Considering the substantial exciton–phonon coupling in thermally activated delayed fluorescence (TADF) materials, it is thus interesting explore whether be used redistribute optical density of states change rate radiative decay. Here, we demonstrate that emission distribution TADF emitters reshaped narrowed top-emitting organic light-emitting...

As a primary anticounterfeiting technology, most paper devices take advantage of photoresponsive behaviors certain security materials or structures, thus featuring low-security threshold, which has been critical global issue. To incorporate optoelectronic into existing technology suggests feasible avenue to address this challenge. Here we report high-performance organic light-emitting paper-based flexible (FAC) device with multiple stimuli-responsiveness, including light, electricity, and...

Abstract A flexible mechanoluminophore device that is capable of converting mechanical energy into visualizable patterns through light-emission holds great promise in many applications, such as human-machine interfaces, Internet Things, wearables, etc. However, the development has been very nascent, and more importantly, existing materials or devices emit light cannot be discernible under ambient light, particular with slight applied force deformation. Here we report a low-cost organic...

In this article, we overview the latest advancements in organic near-infrared (NIR) materials, light-emitting devices and their applications. Moreover, discuss current limitations future prospects for NIR technology.

Organic light-emitting devices (OLEDs), as a luminescent technology with flexible, flat light, have become mainstream display for mobile equipment. Notably, color-tunable OLEDs are capable of dynamically changing the emission wavelength or color light modulated by voltage, and they exhibit distinctive behavior compared that in conventional OLEDs. These intriguing features also sparked many application fields, such smart lighting information encryption. Here, we offer an overview structure...

Two novel iridium(III) complexes (pbi)2Ir(mtpy) (1) and (pbi)2Ir(pbim) (2) adopting 1,2-diphenyl-1H-benzoimidazole (Hpbi) as cyclometalated ligands were successfully synthesized characterized. Strong emissions at 501 536 nm with high photoluminescence quantum yields of 48% 91% in CH2Cl2 298 K obtained for 1 2, respectively. The chemical calculations the photophysical properties indicated that dominant 3MLCT (metal-to-ligand charge-transfer) state mixed 3LLCT (ligand-to-ligand 3LC...

A PSS-rich PEDOT:PSS transparent electrode is proposed to greatly enhance the carrier balance in OLEDs by its hole buffer effect.

Flexible displays are essential to provide information in real time for human–machine interactions. As a next-generation display technology, quantum-dot light-emitting diodes (QLEDs) potentially serving as key components flexible displays. However, it is still challenging QLEDs simultaneously achieve flexibility, large-scale production, and high efficiencies. To this end, strategy proposed here by combining top-emitting structure, optical microcavity optimization, film preparation. A with...

Abstract ZnO nanoparticles (NPs) play a crucial role in advancing quantum-dot light-emitting diodes (QLEDs) because of their excellent electron transport properties. While the conductivity is determined by both density and mobility charge carriers, previously overlooked problem that excessive carrier can lead to nonradiative Auger recombination at quantum-dot/ZnO interface. An ideal layer should possess high low density. Here, we achieve such properties NP films through operando...

Abstract Recent breakthroughs in quantum dot light-emitting devices (QD-LEDs) show their promise the development of next-generation displays. However, QD-LED with conventional ITO-based bottom emission structure is difficult to realize high aperture ratio, electricfield-independent and flexible full-color Hence, we demonstrate top-emitting QD-LEDs dry microcontact printing films. The proved be able accelerate excitons radiative transition rate, then contributing stable electroluminescent...

Abstract The high operating voltage is a primary issue preventing the commercial application of ferroelectric organic field-effect transistor (Fe-OFET) nonvolatile memory (NVM). In this work, we propose novel route to resolve by employing two ultrathin AlO X interfacial layers sandwiching an polymer film with low coercive field, in fabricated flexible Fe-OFET NVM. operation NVMs decreases downscaling thickness film. By inserting at both sides film, not only gate leakage prominently depressed...

Organic–inorganic hybrid LEDs are reviewed from the perspectives of organic and inorganic functional materials, interfacial engineering, device structures physics.

Here, this work presents an air-stable ultrabright inverted organic light-emitting device (OLED) by using zinc ion-chelated polyethylenimine (PEI) as electron injection layer. The chelation is demonstrated to increase the conductivity of PEI three orders magnitude and passivate polar amine groups. With these physicochemical properties, OLED shows a record-high external quantum efficiency 10.0% at high brightness 45,610 cd m-2 can deliver maximum 121,865 m-2. Besides, also possess excellent...

White organic light-emitting devices based on an orange phosphorescent iridium complex, bis(2-(2-fluorphenyl)-1,3-benzothiozolato-N,C2′) (acetylacetonate) [(F-BT)2Ir(acac)] and blue fluorescent 4,4′-bis(2,2′-diphenylvinyl)-1,1′-biphenyl are reported. By introducing a bipolar transport 4,4′N,N′-dicarbazole-biphenyl layer between the emission layers, additional light from (F-BT)2Ir(acac) is observed. The authors attributed it to elimination of Dexter energy transfer two emitters. Pure white...

A novel iridium(III) (pbi)2Ir(biq) with a strong orange emission at 573 nm was synthesized, which showed high photoluminescence quantum yield (PLQY) of 45% in CH2Cl2 298 K. The chemical calculations together the photophysical properties indicated that transition incorporation 3MLCT (metal-to-ligand charge transfer), 3LLCT (ligand-to-ligand transfer) mixed 3LC (ligand-centered 3π–π*) characters contributed to (pbi)2Ir(biq). Cyclic voltammetry (CV), thermogravimetric analysis (TGA) and...

Abstract Ultrasonic spray coating process (USCP) with high material -utilization, low manufacture costs and compatibility to streamline production has been attractive in researches on photoelectric devices. However, surface tension exists the solvent is still a huge obstacle realize smooth organic film for light emitting devices (OLEDs) by USCP. Here, quality polymer anode buffer layer small molecular are successfully realized through USCP introducing extra-low diluent control method. The...

Abstract High color quality and the removal of blue hazard are important for lighting applications. Thermally activated delayed fluorescence (TADF) materials can achieve ≈100% internal quantum efficiency with low cost. However, it is still challenging to high‐color‐quality blue‐hazard‐free TADF‐based white organic light‐emitting devices (WOLEDs). Here, a bluish‐green TADF material named 10,10′‐[5‐(6‐[1,1′‐biphenyl]‐4‐yl‐2‐phenyl‐4‐pyrimidinyl)‐1,3‐phenylene] bis...

A high-performance multi-bit organic transistor nonvolatile-memory, with good mechanical durability and environmental stability, was prepared for the first time on a paper substrate.