We demonstrate efficient light extraction from the active region of bottom-emitting organic emitting devices (OLEDs) using a high refractive index, nondiffractive hemispherical microlens array located between transparent anode and embedded in low index glass substrate (n = 1.5). The subelectrode (SEMLA) results maximum external quantum efficiency 70 ± 4% for green phosphorescent OLEDs (PHOLEDs). Furthermore, wavelength- viewing-angle-independent structure white PHOLED efficiencies 50 3%....

Herein, a droplet manipulation system with superamphiphobic (SPO)–superamphiphilic (SPI) patterned polydimethylsiloxane (PDMS) substrate is developed for multiplex bioassay from single-droplet samples. The SPO fabricated by sequential spraying of adhesive and fluorinated silica nanoparticles onto PDMS substrate. It subsequently subjected to oxygen plasma mask form SPI patterns. layer exhibits extreme liquid repellency high contact angle (>150°) toward low surface tension viscous biofluidic...

Abstract The relationship between anisotropic orientation and molecular structure of thermally activated delayed fluorescent (TADF)‐based organic light emitting devices (OLEDs) is studied using TADF emitters with carbazole, biscarbazole, triscarbazole donor units. bicarbazole donors are more effective than the carbazole in driving molecules. A near‐perfect in‐plane dipole moment demonstrated donor. In addition, based OLED shows high photoluminescence quantum yield an upconversion efficiency...

Abstract The photophysical and electrochemical properties of N‐heterocyclic carbene complexes Iridium (III) (Ir(C ^ C:) 3 , where C C: = N‐phenyl,N‐methyl‐pyrazinoimidazol‐2‐yl (pmpz), N,N‐di‐p‐tolyl‐pyrazinoimidazol‐2‐yl (tpz)) are reported. Facial meridional isomers Ir(pmpz) prepared, but only the facial isomer can be isolated for Ir(tpz) . fac ‐Ir(pmpz) ‐Ir(tpz) have emission maxima at 465 nm in polystyrene, whereas maximum mer is redshifted to 495 nm. energies photoluminescent quantum...

Black phosphorus (BP) is a narrow bandgap layered semiconductor promising for mid-infrared optoelectronic applications. BP-based devices have been shown to surpass state-of-the-art detectors and light-emitting diodes (LEDs) in terms of performance. Despite their device advantages, the material's inherent instability air could hinder its use practical Here, we investigated impact passivation on lifetime BP LEDs, which deteriorate matter seconds without using passivation. The significantly...

One pot synthesis of RhCu alloy truncated octahedral nanoframes, Cu@Rh core–shell nanoparticles, and a bundle five nanowires is demonstrated. The 3D nanoframe, in particular, exhibits excellent catalytic activity toward the oxygen evolution reaction under alkaline conditions. Nanoparticle structure engineering has been extensively studied recent years for development active nanocatalysts energy conversion technologies such as fuel cells.1-9 A great improvement this area feasible with...

Orienting light-emitting molecules relative to the substrate is an effective method enhance optical outcoupling of organic devices. Platinum(II) phosphorescent complexes enable facile control molecular alignment due their planar structures. Here, orientation Pt(II) during growth emissive layers controlled by two different methods: modifying structure and using structural templating. Molecules whose structures are modified adjusting diketonate ligand Pt complex, dibenzo-(f,h)quinoxaline...

Mixing a sterically bulky, electron-transporting host material into conventional single host-guest emissive layer is demonstrated to suppress phase separation of the matrix while increasing efficiency and operational lifetime deep-blue phosphorescent organic light-emitting diodes (PHOLEDs) with chromaticity coordinates (0.14, 0.15). The bulky enables homogenous mixing molecules comprising suppressing aggregation; significant loss channel nonradiative recombination. By controlling amorphous...

Abstract The orientation of facial ( fac ) tris‐cyclometalated iridium complexes in doped films prepared by vacuum deposition is investigated altering the physical shape and electronic asymmetry molecular structure. Angle‐dependent photoluminescence spectroscopy Fourier‐plane imaging microscopy show that roughly spherical ‐tris(2‐phenylpyridyl)iridium (Ir(ppy) 3 isotropic, whereas are oblate spheroids, ‐tris(mesityl‐2‐phenyl‐1 H ‐imidazole)iridium (Ir(mi)...

Exploring crevasses in extreme environments such as Antarctica is highly dangerous yet essential for ensuring safe movement. Recently, robotic systems have been investigated a means to conduct exploration regions. Unlike conventional settings, these require integrated capabilities, including mobility harsh terrain and the ability operate reliably at extremely low temperatures. In this paper, we propose KAREX (Korea Antarctic Robot EXplorer), system designed investigate support research...

Shape-controlled Pt-based seeds lead to completely different M/Pt (M = Ru or Rh) structures of nanobox octapod. Unusually high catalytic activities Pt@Ru octapod toward the oxygen evolution reaction are observed due a core–shell effect.

It has long been a challenge to develop highly efficient outcoupling method for organic light-emitting diodes that is independent of wavelength and viewing angle, as well being nonintrusive into the device structure. Here, we demonstrate transparent, top emitting structure integrated with high index refraction waveguide layer rough, dielectric diffuse reflector eliminates plasmonic, waveguide, substrate modes without introducing viewing-angle dependence. The simple increases external quantum...

Abstract Wide energy gap materials dispiro[fluorene‐9,9′‐anthracene‐10′,9″‐fluorene] (SAS) and dispiro[xanthene‐9,9′‐anthracene‐10′,9″‐xanthene] (XAX) containing double spiro–carbons, are introduced as hosts for blue phosphorescent organic light‐emitting diodes (PHOLEDs). Both SAS XAX free of heteroatomic exocyclic bonds, which implicated in limiting the stability PHOLEDs. The synthesized gram‐scale quantities through short efficient paths. They have large gaps (≥5.0 eV) between highest...

Recently, sustainable growth and development has become an important issue for governments corporations. However, maintaining is very difficult. These difficulties can be attributed to sociocultural political backgrounds that change over time [1]. Because of these changes, the technologies sustainability also change, so companies attempt predict manage technology using patent analyses, but it difficult rapidly changing markets. The best way achieve insight into management in this market...

Cyanobacterial blooms appear by complex causes such as water quality, climate, and hydrological factors. This study aims to present the machine learning models predict occurrences of these complicated cyanobacterial efficiently effectively. The dataset was classified into groups consisting two, three, or four classes based on cell density after a week, which used target variable. We developed 96 for Chilgok weir using classification algorithms: k-Nearest Neighbor, Decision Tree, Logistic...

A humanoid, which refers to a robot that resembles human body, imitates human’s intelligence, behavior, sense, and interaction in order provide various types of services beings. Humanoids have been studied developed constantly improve their performance. were previously for simple repetitive or hard work required significant power. However, intelligent service robots actively these days necessary information enjoyment; include manufactured home, entertainment, personal use. It has become...

A facile one step route has been developed for the synthesis of trimetallic Cu@RhRu core–shell concave nanooctahedra by co-decomposition Ru, Rh and Cu precursors. mechanistic study reveals that nanoparticles with a CuRh alloy core Ru shell are initially formed subsequent migration to results in nanooctahedron. The exhibits atomically mixed phases an fcc atomic structure, although hcp structure is commonly found bulk Ru. We also report unusually high catalytic activity octahedral nanocrystals...

A power conversion system to drive a high-frequency electrosurgical generator (ESG) is proposed. The proposed consists of 4-MHz full-bridge inverter capable ensuring in wide load impedance range and implementing energy control functions accordance with the ESG characteristics. Unlike conventional systems, cannot deliver directly load, but through an instrument, which makes it difficult ensure power. Thus, matching essential ESG. For power, realized using resonance filter while considering...

We use Fourier-plane imaging microscopy (FIM) to determine the transition-dipole-moment orientation in doped organic emissive thin films. The of FIM enables precise, sensitive, and rapid measurement dipole emission layer an light-emitting device (OLED). An optical model a stratified birefringent multilayer is introduced for interpreting results obtained by FIM. Using model, we average vectors three phosphorescent dopant emitters. alignment measured quantitatively explains difference OLED...

We demonstrate an alternating current (AC) driven light emitting capacitor in which the color of emission spectra can be changed via applied AC frequency. The device has a simple metal-oxide-semiconductor (MOS) structure with organic emissive layer, enabling facile fabrication processing. layer comprises thin, submonolayer low energy dye underneath thick host matrix (∼30 nm) higher dyes. lower dyes dominates at frequency, while high This tunable could used for full-color displays and lighting future.

We report a method to neutralize the mid-gap defect states in MoS2 monolayers using laser soaking of an organic/transition metal oxide (TMO) blend thin film. The treated monolayer shows negligible emission from as compared as-exfoliated MoS2, accompanied by photoluminescence quantum yield improvement 0.018 4.5% at excitation power densities 10 W/cm2. effectiveness toward neutralization is governed polaron pair generated organic/TMO interface, diffusion free electrons, and subsequent...