A one-step microwave synthesis of N-doped hydroxyl-functionalized carbon dots (CDs) with ultra-high fluorescence quantum yields (QYs) 99% is reported. These QY CDs were synthesized using citric acid and amino compound-containing hydroxyls like ethanolamine tris(hydroxylmethyl)aminomethane. Amino carboxyl moieties can form amides through dehydration condensation reactions, these act as bridges between hydroxyl groups, modify groups on the surface CDs. The entire reaction be carried out within...

High-efficiency blue CdSe/ZnS quantum dots (QDs) have been synthesized for display application with emission peak over 460 nm the purpose of reducing harmful effect short-wavelength light to human eyes. To reach a better charge balance, different size ZnO nanoparticles (NPs) were and electrical properties NPs analyzed. Quantum dot light-emitting diodes (QLEDs) based on as-prepared QDs optimized successfully fabricated. Using small-size NPs, we obtained maximum current efficiency (CE) 14.1 cd...

The selective hydrogenation of alkynes is an important reaction; however, the catalytic activity and selectivity in this reaction are generally conflicting. In study, ultrafine Pd nanoparticles (NPs) loaded on a graphite-like C3 N4 structure with nitrogen defects (Pd/DCN) synthesized. resulting Pd/DCN exhibits excellent photocatalytic performance transfer ammonia borane. rate superior to those Pd/BCN (bulk without defects) under visible-light irradiation. characterization results density...

Efficient inorganic perovskite light-emitting diodes (PeLEDs) with an ultrathin emission layer (∼30 nm) were realized by doping Lewis base polyethylene glycol (PEG) into CsPbBr3 films. PEG in the films not only physically fills crystal boundaries but also interacts crystals to passivate grains, reduce nonradiative recombination, and ensure efficient luminance high efficiency. As a result, promoted brightness, current efficiency (CE), external quantum (EQE) achieved. The decay rate of...

Methylammonium (MA) lead halide (MAPbX3, X = Cl, Br, I) perovskite quantum dots (PQDs) are very sensitive to environment (moisture, oxygen, and temperature), suffering from poor stability. To improve the stability, we synthesized silica-coated PQDs (SPQDs) by an improved ligand-assisted reprecipitation method through simply mixing stirring under room temperature in air without adding water catalyst, whole process took only a few seconds. The photoluminescence (PL) spectra of SPQDs can be...

Abstract Lattice matching and passivation are generally seen as the main beneficial effects in 2D/3D perovskite heterostructured solar cells, but understanding of mechanisms involved is still incomplete. In this work, it shown that heterostructure unstable under common thermal processing conditions, caused by lattice expansion strained 2D perovskite. Therefore an innovative fabrication technology involving a compressively PEA 2 PbI 4 layer proposed to compensate internal tensile strain...

Although inorganic perovskite solar cells (PSCs) are promising in thermal stability, their large open-circuit voltage (VOC ) deficit and difficulty large-area preparation still limit development toward commercialization. The present work tailors C60 via a codoping strategy to construct an efficient electron-transporting layer (ETL), leading significant improvement VOC of the inverted CsPbI2 Br PSC. Specifically, tris(pentafluorophenyl)borane (TPFPB) is introduced as dopant lower lowest...

Carbon nanodots (CDs) are known to be a superior type of lasing material due their low cost, toxicity, high photostability, and photobleaching resistance. Significant attention has been paid synthesizing CDs with fluorescence quantum yields (FLQYs) achieve higher optical gains. In this report, we reveal that excitation wavelength-independent (λex-independent) photoluminescence (PL) characteristics, rather than FLQYs, should given priority realize CD-based light amplification....

Exploring novel surface-enhanced Raman scattering (SERS) active materials with high detection sensitivity, excellent biocompatibility, low biotoxicity, and good spectral stability is urgently required for efficacious cancer cell diagnosis. Herein, black TiO2 nanoparticles (B-TiO2 NPs) crystal-amorphous core-shell structure are successfully developed. Remarkable SERS activity derived from the synergistic effect of promising structure. Abundant excitons can be generated by high-efficiency...

The boosted SERS activity is attributed to a high-efficiency PICT process due the significant reduction of non-radiative recombination at low temperature.

A multifunctional natural polyphenol-functionalized chitosan/gelatin sponge (PCGS) is reported for hemostatic and infected wound therapy.

With the rapid development of modern electrical equipment towards miniaturization, integration, and high power, high-temperature-resistant insulating papers with superior thermal conductivity are highly desirable for ensuring reliability high-end...

Abstract A CsPbBr 3 ‐based all‐inorganic perovskite light‐emitting diode (PeLED) with ultrahigh brightness and enhanced stability is prepared by controlling of morphology interface engineering. nonionic surfactant polyoxyethylene (20) sorbitan monolaurate introduced into the film, which induces tightly arranged grains in thus highly passivating defects at grain boundaries, resulting a performance‐enhanced PeLED highest 111 000 cd m −2 , peak current efficiency (CE) 21.1 −1 maximum external...

Abstract In this paper, a facile sol–gel process for producing monodisperse, spherical, and nonaggregated pigment particles with core/shell structure is reported. Spherical silica (245 385 nm in diameter) Cr 2 O 3 , α‐Fe ZnCo 4 CuFeCrO MgFe CoAl pigments are selected as cores shells, respectively. The obtained core/shell‐structured samples, denoted SiO @Cr (green), @α‐Fe (red), @MgFe (brown), @ZnCo (dark green), @CoAl (blue), @CuFeCrO (black), well characterized by using X‐ray diffraction...

Abstract The electroresponsive WO 3 ‐based electrochromic distributed Bragg reflectors (ECDBRs) are fabricated by means of one‐step, room temperature glancing‐angle electron‐beam evaporation. reflectance and wavelength ECDBRs can be precisely reversibly tailored on a large scale simply applying small bias voltage (±1.1 V) due to the effect layer, this unique character is utilized construct an electrically tunable microcavity luminescent device with embedded green CdSe@ZnS quantum dots (QDs)....

Abstract This paper reports our experimental studies on the underlying mechanism responsible for electroluminescence spectral narrowing phenomenon in cavity-based organic light-emitting diodes. It is found that microcavity generates an emerging phenomenon: a magneto-photoluminescence signal Poly(9,9-dioctylfluorene-alt-benzothiadiazole) polymer under photoexcitation, which completely absent when not used. provides evidence leads to formation of spatially extended states, functioning as...

Continuous-wave (CW) lasing in quasi-two-dimensional (2D) perovskite-based distributed feedback cavities has been achieved at room temperature; however, CW microcavity lasers comprising Bragg reflectors (DBRs) have rarely prepared using solution-processed quasi-2D perovskite films because the roughness of significantly increases intersurface scattering loss microcavity. Herein, high-quality spin-coated gain were an antisolvent to reduce roughness. The highly reflective top DBR mirrors...

In this paper, BPO4 and Ba2+-doped powder samples were prepared by the sol−gel process using glycerol poly(ethylene glycol) as additives. The structure optical properties of resulting characterized X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, field emission scanning electron microscopy (FESEM), diffuse reflection spectra, photoluminescence (PL) excitation quantum yield, kinetic decay, paramagnetic resonance (EPR), respectively. It was found that undoped showed a...

This study evaluated the shear bond strengths and etching patterns of seven self-adhesive resin cements to human enamel specimens which were subjected one following surface treatments: (1) Polishing with #600 polishing paper; (2) Phosphoric acid; (3) G-Bond one-step adhesive; or (4) acid G-Bond. After treatment, incisor bonded a composite using cement [Maxcem (MA), RelyX Unicem (UN), Breeze (BR), BisCem (BI), seT (SE), Clearfil SA Luting (CL)] conventional [ResiCem (RE)]. Representative...

Abstract A novel UV transparent conducting films based on Sb 2 O 3 /Ag/Sb (SAS) structure, which were prepared by an electron-beam thermal evaporation at room temperature. This SAS exhibits excellent electrical, optical and stable properties. Especially for region, the has high transmittance of 80% 306 nm 92% 335 nm, meanwhile achieving low sheet resistance ( ≤ 10 Ω sq −1 ). The OLED show competitive device performance. obtains peak electroluminescence 376 shows a very maximum EQE 4.1% with...

Because of the wide emission spectrum tunability that ranges from visible region to near-infrared, InP-based colloidal quantum dots (QDs) show great promise for use in next-generation full-color displays and solid-state lighting. The performance-improved InP QD-based light-emitting devices (QLEDs) were fabricated by using Mg-doped ZnO nanoparticles (ZnMgO NPs) as an interlayer between electron transport layer active QD layer. It is found ZnMgO NPs can reduce injection suppress exciton...

Abstract Background The purposes of this simulation study were to evaluate the stresses in roots endodontically treated molars with extensive coronal tissue loss which restored by endocrowns (all-in-one core and crown) traditional crowns post-cores, during masticatory using finite element analysis. Methods A mesio-distal cross-section a lower right first molar was digitized used create 2-dimensional models teeth supporting tissue; different crown designs, viz., endocrown 2 mm occlusal...