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...

Abstract As a new solution‐processable laser material, carbon dots (CDs) offer advantages of non‐toxicity, low‐cost, and high‐stability, which are conducive to the sustainable development miniaturized lasers. Full‐color CDs (FC‐CDs) with bright‐blue, green, yellow, red, deep‐red, near‐infrared (NIR) fluorescence prepared. Their photoluminescence emission ranges from 431 714 nm. The FC‐CDs show narrow full widths at half maximum in range 44–76 nm, concurrent high radiative transition rates (...

Abstract It is challenging to realize ultra‐pH‐responsive fluorescent carbon dots (CDs), especially reversibly adjustable multichromatic emission covering a broad wavelength range including deep‐red lasing. This study reports one‐step solvothermal treatment of pyrogallol obtain brilliant CDs with substantial bathochromic shift (from blue dark red emission) induced by pH changes. The show an excellent reversible response: simple acid instantaneously shifts their initial green 140 nm...

Carbon dots (CDs) are promising luminescent emission layer materials for next generation electroluminescent light emitting diodes (EL-LEDs) due to their many advantages, such as environmental friendliness, low cost, and high stability. However, limited by the spin-forbidden properties of triplet transition, it is difficult improve external quantum efficiency (EQE) fluorescent CDs-based EL-LEDs. Meanwhile, traditional thermally activated delayed (TADF) CDs prepared using coating strategies...

CoF3 aqueous solution was used to modify the surface of Ti-doped iron oxidethin film photoanodes negatively shift flat-band potential and allow photogenerated electrons directly reduce water hydrogen without an external bias; zero bias performance further improved by use glucose (a biomass analog) bypass relatively slow oxygen evolution reaction provide a source rapidly consume holes.

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...

To improve the optoelectronic properties of iron oxide as a photoelectrode, hematite (α-Fe2O3) thin films were doped with titanium using atmospheric pressure chemical vapor deposition (APCVD) for synthesis. The prepared by pyrolysis Fe(CO)5 and TiCl4 precursors on fluorine-doped tin (FTO) substrates found to have polycrystalline morphology faceted particulates ∼20 50 nm in size preferred crystallographic growth along [110] direction. performance photoanodes was measured function...

High-efficiency excimer fluorescence of <bold>mTPA-9-AN</bold> is realized by a thermally-activated phase transition process.

Miniaturized solid-state lasers with a single longitudinal mode are vital for various photonic applications. Here we prepare red-emissive carbon dots (CDs) photoluminescence quantum yield (PLQY) of 65.5 % by combining graphitic nitrogen doping and surface modification. High-concentration alters the CDs' emission from blue to red, while electron-donating groups polymer coating on their surfaces improve PLQY photostability. The CDs exhibit excellent stimulated characteristics, low threshold...

An H-shaped photonic crystal fiber (PCF)-based surface plasmon resonance (SPR) sensor is proposed for detecting large refractive index (RI) range which can either be higher or lower than the RI of material used. The grooves PCF as sensing channels are coated with gold film and then brought into direct contact analyte, not only reduces complexity fabrication but also provides reusable capacity compared other designs. performance investigated by using finite element method. Numerical results...

Carbon dots (CDs) are promising nanomaterials for next-generation lighting and displays due to their tunable bandgap, high photoluminescence quantum yield (PLQY), stability. However, the exciton utilization efficiency (EUE) of CD-based films can only reach 25%, fundamentally limiting application in electroluminescent light-emitting diodes (LEDs). Improving EUE is therefore great significance. Herein, we developed composite containing CDs poly(9-vinylcarbazole) (PVK). The were then used...

As a new type of solution-processed nano-laser material, carbon dots (CDs) have shown considerable potential in optical communication, laser displays, micro/nano processing, and biomedicine. Reducing the threshold gain material is significance for further development CDs' applications field lasers. A series blue-emissive CDs (B-CDs) are synthesized by changing molar ratios precursors (citric acid (CA): L-Cysteine (L-Cys)). B-CDs structure nanoparticles with their surface being modified...

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....

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...

Quasi-2D perovskites based blue light-emitting diodes (LEDs) suffer from its poor electroluminescence performance, mainly caused by the nonradiative recombination in defect-rich low-

Abstract Carbon dots (CDs) have emerged as an exceptional material for the emission layer in new generation of electroluminescent light‐emitting diodes (ELEDs) owing to their low cost, high stability, and luminous efficiency. Although blue CDs‐based ELEDs a wide bandgap exciton utilization efficiency (EUE), it is still challenging increase external quantum (EQE). thermally activated delayed fluorescence triplet‐triplet annihilation may improve EUE, design complicated by significant charge...

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)....

The utilization of triplet excitons plays a key role in obtaining high emission efficiency for organic electroluminescent devices. However, to date, only phosphorescent materials have been implemented harvest the light-emitting field effect transistors (OLEFETs). In this work, we report first incorporation exciplex thermally activated delayed fluorescence (TADF) emitters heterostructured OLEFETs excitons. By developing new kind TADF emitter constituted by m-MTDATA...

Abstract Carbon dots (CDs) serve as a novel, non‐toxic, cost‐effective, and highly‐stable solution‐processable nanolaser material. However, compared to commonly used commercial laser dyes, CDs exhibit lower photoluminescence quantum yields (PLQYs), radiation transition rates, gain coefficients. Consequently, this leads higher thresholds that significantly impede the expansion of practical applications for CDs. Therefore, enhancing performance is crucial in guiding design CD materials...

Vortex beams (VBs), with their unique spatial light field distribution, show promising applications in fields such as optical micromanipulation and high-capacity communications. However, the simultaneous realization of broad wavelength tunability high topological charge remains a great challenge. In this work, based on gain media fluorescent carbon dots, which are known class solution-processable biocompatible materials luminescence spectra covering from ultraviolet to near-infrared, perfect...