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...

Via using an L-band optimized in-fiber polarizing grating device, a GHz femtosecond passively harmonic mode-locked Er-doped fiber laser based on nonlinear polarization rotation is first demonstrated. In total, 4.22 pulses with the duration of 810 fs and super-mode suppression ratio (SMSR) 32 dB are obtained under pump power 712 mW corresponding to 215 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">th</sup> order. The central wavelength 1581.7...

A highly efficient solution-processed QLED device with a doped HTL has been demonstrated by the modulation of hole transport.

Abstract Carbon nanotubes (CNTs) possess remarkable nonlinear optical properties; a particular application is to function as mode locker used in ultrafast fiber lasers produce ultrashort pulses. Various types of CNT saturable absorbers (SAs) and have been demonstrated. In this review, typical fabrication process development SAs are discussed we highlight the recent investigation progress state-of-the-art covering GHz, bidirectional lasers, vectorial comb systems, mode-locking dynamics. Our...

Surface plasmon-enhanced electroluminescence (EL) has been demonstrated by incorporating gold (Au) nanoparticles (NPs) in quantum dot light-emitting diode (QLED). Time-resolved photoluminescence (TRPL) spectroscopy reveals that the EL enhancement is ascribed to near-field through an effective coupling between excitons of emitters and localized surface plasmons around Au NPs. It found size NPs distance emissive layer have significant effects on performance QLED. The can be maximized as SP...

The migration of talents is crucial for regional development, while this issue overlooked in the context developing countries. This paper investigates causal effect relaxing internal restrictions on labor market outcomes college graduates China, exploiting 2014 hukou (household registration) reform. Using a Difference-in-Differences method, we find that non-megacities have become more appealing to graduates, and wages experienced significant decline relative their counterparts megacities...

Abstract Depression is a common psychiatric disorder, and monoamine‐based antidepressants as first‐line therapy remain ineffective in some patients. The synergistic modulation of neuroinflammation neuroplasticity could be major strategy for treating depression. In this study, an inflammation‐targeted microglial biomimetic system, PDA‐Mem@M, reported Microglial membrane‐coated nanoparticles penetrate the blood‐brain barrier facilitate targeting. Subsequently, owing to excellent free...

Pt(IV) complexes has been studied for its synthesis and anticancer therapy, while little is focus on supramolecular self‐assembly of complexes. Herein, three the form Pt(ppy)(pyn)Cl3 (n=1‐3), (where ppy represents 2‐phenylpyridine py 4‐phenylpyridine derivatives), were prepared investigated their photophysical properties upon in dichromethane. Among complexes, Pt(ppy)(py3)Cl3, where decorated with long chain L‐glutamated derivative, showed remarkably amplified chiral signal enhanced...

High performance, mechanically flexible quantum dot light emitting diodes (QLEDs) based on ZnO nanoparticles used as an electron transfer layer (ETL) are reported.

Here, we report on the hybrid hole transport materials 4,4'-bis-(carbazole-9-yl)biphenyl (CBP) or poly-N-vinylcarbazole (PVK) doped into poly(4-butyl-phenyl-diphenyl-amine) (Poly-TPD) as layer (HTL) to tailor energy band alignment between injection (HIL) and quantum dot (QD) light emitting in order realize efficient diodes (QLEDs) all solution-processed fabrication. Compared pristine Poly-TPD based device, it is found that electroluminescence (EL) performance of QLEDs can be significantly...

We present a passively mode-locked Erbium-doped fiber laser with tunable parameters including central wavelength, 3-dB bandwidth, and pulse duration. The mode-locking mechanism of the is realized by using single-walled carbon nanotubes (SWCNTs) polyvinyl alcohol composite film as saturable absorber. operation implemented via birefringence filter consisting polarization maintaining (PM) Brewster grating. achieves maximum spectral tuning range 36 nm 8-cm PM fiber. width variation 5.19 acquired...

Although recent breakthroughs in reported graphene-based phototransistors with embedded quantum dots (QDs) have definitely been astonishing, there are still some obstacles their practical use regard to electrical and optical performances.

We experimentally demonstrate a passively harmonic mode locked (PHML) Er-doped fiber laser with pump power efficiency up to 17 MHz/mW operating at L-band based on single walled carbon nanotubes polyvinyl alcohol (SWCNTs-PVA) film. Under 233 mW power, the stable pulse train 1594.97 nm 40.5 dB side suppression ratio (SMSR) and 742 fs duration is obtained repetition rate of 1.923 GHz, corresponding 170 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...

We demonstrate an L-band wavelength-tunable passively mode-locked fiber laser using a single long-period grating (LPFG) as narrow-band optical attenuator (NBOA). Through bending the LPFG, central wavelength can be continuously tuned from 1582.02 to 1597.29 nm, while output power only varies 1.465 1.057 mW, approximately rate of 22 µW/nm variation. This is first time that LPFG functioned NBOA in lasers, showing great advantage less impact on variation reduction. Besides, total cavity length...

We report the experimental observation of transformation process from a stationary soliton to pulsating in mode-locked fiber laser. The detailed dynamics, including parameter changings and sideband variation transition, are analyzed by dispersive Fourier technique. This Letter unveils great enhancement intracavity periodic perturbations resulting slight increase intensity induced modulation instability, leading occurrence parametric sidebands multi-periodic pulsing instability. Our results...

The Mamyshev oscillator (MO) is a promising platform to generate high-peak-power pulse with environmentally stable operation. However, rare efforts have been dedicated unveil the dynamics from seed signal pulse, particularly for multi-pulse Herein, we investigate buildup of in fiber MO. It revealed that gain competition among successively injected pulses leads higher pump power required ignite MO, hence resulting optical supports multiple pulses. are identified be evolved Moreover,...

Leukopenia is the most common side effect of chemotherapy and radiotherapy. It potentially deteriorates into a life-threatening complication in cancer patients. Despite several agents being approved for clinical administration, there are still high incidences pathogen-related disease due to lack functional immune cells. ADP-ribosyl cyclase CD38 displays regulatory on leukopoiesis system. To explore whether was potential therapeutic target leukopenia. We established drug screening model based...

Via careful choice of Er-doped fiber length in the cavity, a widely wavelength-tunable L-band dissipative soliton all-fiber laser incorporating optimized polarizing grating device is experimentally demonstrated. The delivers 15.38 ps pulses centered at 1597.34 nm with 3 dB bandwidth 34.6 under 622 mW pump power. pulse repetition rate 23 MHz. After using single mode external duration compressed to 772 fs. With nonlinear polarization rotation-based intracavity comb filter, central wavelength...

Abstract We demonstrate a high-energy noise-like pulse (NLP) generated by an Er-doped fiber (EDF) laser incorporating PbS quantum dot (QD) polystyrene (PS) composite film as saturable absorber (SA). Benefitting from the intrinsic properties of NLPs and high damage threshold QD PS film, stable NLP train can be obtained with output power 96.3 mW at pump 660 mW, corresponding to energy 9.68 nJ. This represents highest ever reported in EDF material-based SAs. The slope efficiency reached 17.37%...

We demonstrate a quantum dot capped gold nanoparticle composite as an emitting layer in light-emitting diodes to achieve enhanced efficiency.

A single/dual-wavelength switchable bidirectional Q-switched fiber laser using a polarizer is demonstrated. 45° tilted grating used as to induce intracavity birefringence filter in both clockwise (CW) and counter-clockwise (CCW) directions. carbon nanotube saturable absorber employed produce pulses. Through adjusting polarization states, lasing at 1551 1560 nm can be achieved CW CCW To the best of our knowledge, this first demonstration wavelength passively laser.

We systematically study the impact of average cavity dispersion and pulse spectral bandwidth on harmonic mode locking in long-wavelength band from an Er-doped fiber laser using carbon nanotubes polyvinyl alcohol (CNTs-PVA) film locker. By carrying out energy management through optimizing optical bandwidth, 2.08 GHz repetition rate corresponding to 201 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">st</sup> with 36.5 dB side suppression ratio...