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Relativistic toroidal light solitons in plasma

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Plasma Science and technology 2023年第3期25卷 1-5页

作者：程中明邓达超郁明阳武慧春 Institute for Fusion Theory and Simulation School of PhysicsZhejiang UniversityHangzhou 310027People's Republic of China college of engineering physics Shenzhen Technology UniversityShenzhen 518118People's Republic of China

In the laser–plasma interaction,relativistic soliton formation is an interesting nonlinear phenomenon and important light mode convection in ***,it is shown by threedimensional particle-in-cell simulations that relativistic toroidal solitons,composed of intense light self-consistently trapped in toroidal plasma cavities,can be produced by azimuthallypolarized relativistic laser pulses in a near-critical underdense plasma.

关键词： azimuthally polarized laser pulse near-critical underdense plasma toroidal solitons relativistic solitons in plasma 3D particle-in-cell simulation self-focusing in plasma

Two-photon absorption of FAPbBr_(3) perovskite nanocrystals

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Chinese physics B 2023年第6期32卷 27-33页

作者：张轩宇肖书宇王雄彬贺廷超陈锐 Department of Electrical and Electronic engineering Southern University of Science and TechnologyShenzhen 518055China college of physics and Optoelectronic engineering Shenzhen UniversityShenzhen 518060China

Perovskite nanocrystals(NCs) with high two-photon absorption(TPA) cross-section are of great interest due to their potential applications in three-dimensional optical data storage and multiphoton fluorescence microscopy. Among various perovskite materials, FAPbBr_(3) NCs show a better development prospect due to their excellent stability. However, there are few reports on their nonlinear optical properties. In this work, the nonlinear optical behavior of FAPbBr_(3) NCs is *** methods of multiphoton absorption photoluminescence saturation and open aperture Z-scan technique were applied to determine the TPA cross-section of FAPbBr_(3)NCs, which was around 2.76 × 10^(-45)cm^(4)·s·photon^(-1) at 800 nm. In addition,temperature-dependent photoluminescence induced by TPA was investigated, and the small longitudinal optical phonon energy and electron–phonon coupling strength was obtained, which confirm the weak Pb–Br interaction. Meanwhile, it is found that the exciton binding energy in FAPbBr_(3) NCs was 69.668 me V, which may be ascribed to the strong hydrogen bond interaction. It is expected that our findings will promote the application of FAPbBr_(3) NCs in optoelectronic devices.

关键词： FAPbBr_(3)nanocrystals two-photon absorption cross-section Z-scan multiphoton absorption photoluminescence saturation

TiS2-based saturable absorber for ultrafast fiber lasers

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Photonics Research 2018年第10期6卷 I0046-I0050页

作者： X. ZHU S. CHEN M. ZHANG L. CHEN Q. Wu J. ZHAO Q．JIANG Z．ZHENG H．ZHANG School of Electronic and Information engineering Beihang University Beijing 100191 China Department of Optoelectronics engineering Shenzhen University Shenzhen 518060 China college of Health Science and Environmental engineering Shenzhen Technology University Shenzhen 518118 China college of Materials Science and engineering Shenzhen University Shenzhen 518060 China

We fabricate titanium disulfide(TiS2) using a liquid exfoliation method and subsequently a TiS2-based device by optically depositing the TiS2 material onto the microfiber. This device exhibits a strong nonlinear saturable absorption property with an optical modulation depth of 8.3% at 1560 nm. With the implementation of this all-fiber TiS2-based saturable absorber, we demonstrate that both mode-locking and Q-switching operation can be obtained in a turn-key all-fiber erbium-doped laser cavity. Our findings constitute the first example, to the best of our knowledge, of a TiS2-based saturable absorber for ultrashort pulse generation and highlight the great potential of such devices in two-dimensional nanomaterials-related photonics.

关键词：液体剥离方法激光器通讯技术发展现状

CNTs/CNF-supported multi-active components as highly efficient bifunctional oxygen electrocatalysts and their applications in zincair batteries

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Nano Research 2023年第4期16卷 4793-4802页

作者： Weiyuan Ding Ali Saad Yuchen Wu Zhiwei Wang Xiuting Li Institute for Advanced Study Shenzhen UniversityShenzhen 518060China college of physics and Optoelectronic engineering Shenzhen UniversityShenzhen 518060China

Rational construction of active components has been the biggest challenge in preparing efficient bifunctional oxygen ***,electrospinning and chemical vapor deposition(CVD)were employed to embed active species including FeCo nanoparticles,MNx(M=Fe,Co),and FePx in porous and graphitized carbon nanotubes(CNTs)/carbon nanofiber(CNF).The as-prepared FeCo@CoNx@FePx/C exhibited a half-wave potential as high as 0.86 V in oxygen reduction reaction(ORR)and low oxygen evolution reaction(OER)overpotential of 368 mV at 10 mA·cm^(−2),which are superior to Pt/C(0.83 V)and IrO_(2)(375 mV)*** assembled Zn-air battery(ZAB)showed a high energy efficiency(Edischarge/Echarge)of 65%at 20 mA·cm^(−2)and stabilized for 700 charge-discharge *** spectroscopic and microscopic characterizations evidenced that the outstanding bifunctionality of the electrocatalyst can be ascribed to three main reasons:First,FeCo nanoparticles are rich in MOH/MOOH active sites for OER,and FePx/CNTs constructed with CVD also modulate electronic structure to improve electron transfer;second,both MNx in carbon matrix and FePx/CNTs are highly active towards ORR;third,the CNTs/CNF are highly porous and graphitized,which promotes mass transport and improves electrical conductivity and stability of the *** work gives important implications on the design of bifunctional electrocatalysts.

关键词： carbon nanotubes(CNTs)/carbon nanofiber(CNF)-supported multi-active components oxygen reduction reaction oxygen evolution reaction zinc-air battery

A model for fast electron-driven high-density plasma in the double-cone ignition scheme

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Chinese physics B 2024年第11期33卷 322-330页

作者： Zhong-Yi Chen Kai-Ge Zhao Ying-Jun Li School of Science China University of Mining and TechnologyBeijing 100083China shenzhen Key Laboratory of Ultraintense Laser and Advanced Material technology Center for Intense Laser Application Technologyand College of Engineering PhysicsShenzhen Technology UniversityShenzhen 518118China State Key Laboratory for Tunnel engineering China University of Mining and TechnologyBeijing 100083China

A model for fast electron-driven high-density plasma is proposed to describe the effect of injected fast electrons on the temperature and inner pressure of the plasma in the fast heating process of the double-cone ignition(DCI)*** to the collision of the two low-density plasmas,the density and volume of the high-density plasma ***,the ignition temperature and energy requirement of the high-density plasma vary at different moments,and the required energy for hot electrons to heat the plasma also *** practical experiments,the energy input of hot electrons needs to be *** reduce the energy input of hot electrons,the optimal moment and the shortest time for injecting hot electrons with minimum energy are *** this paper,it is proposed to inject hot electrons for a short time to heat the high-density plasma to a relatively high ***,the alpha particles with the high heating rate and PdV work heat the plasma to the ignition temperature,further reducing the energy required to inject hot *** study of the injection time of fast electrons can reduce the energy requirement of fast electrons for the high-density plasma and increase the probability of successful ignition of the high-density plasma.

关键词： fast electrons the high-density plasma alpha particles double-cone ignition scheme the optimal moment the shortest time

Acceptor-Donor-Acceptor π-Stacking Boosts Intramolecular Through-Space Charge Transfer towards Efficient Red TADF and High-PerformanceOLEDS

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Research 2022年第4期2022卷 283-294页

作者： Chenglin Jiang Jingsheng Miao Danwen Zhang Zhenhua Wen Chuluo Yang Kai Li shenzhen Key Laboratory of New Information Display and Storage Materials College of Materials Science and EngineeringShenzhen UniversityShenzhen 518055China college of physics and Optoelectronic engineering Shenzhen UniversityShenzhen 518060China

Organic push-pull systems featuring through-space charge transfer(TSCT)excited states have been disclosed to be capable of exhibiting thermally activated delayed fluorescence(TADF),but to realize high-efficiency long-wavelength emission still remains a ***,we report a series of strongly emissive orange-red and red TSCT-TADF emitters having(quasi)planar and rigid donor and acceptor segments which are placed in close proximity and orientated in a cofacial *** maxima(λ_(em))of 594−599 nm with photoluminescence quantum yields(PLQYs)of up to 91%and delayed fluorescence lifetimes of down to 4.9μs have been achieved for new acceptor-donor-acceptor(A-D-A)molecules in doped thin *** presence of multiple acceptors and the strong intramolecularπ-stacking interactions have been unveiled to be crucial for the efficient low-energy TSCT-TADF *** light-emitting diodes(OLEDs)based on the new A-D-A emitters demonstrated electroluminescence with maximum external quantum efficiencies(EQEs)of up to 23.2%for the red TSCT-TADF *** EQE of 18.9%at the brightness of 1000 cd m^(-2) represents one of the highest values for red TADF *** work demonstrates a modular approach for developing high-performance red TADF emitters through engineering through-space interactions,and it may also provide implications to the design of TADF emitter with other colours.

关键词： emitter OLED donor

Light-driven sextuple theranostics:nanomedicine involving second near-infrared AIE-active Ir(Ⅲ)complex for prominent cancer treatment

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Science China Chemistry 2024年第7期67卷 2314-2324页

作者： Xue Liu Jiangao Li Fei Zhang Dingyuan Yan Lei Wang Dong Wang Ben Zhong Tang Center for AIE Research Shenzhen Key Laboratory of Polymer Science and TechnologyGuangdong Research Center for Interfacial Engineering of Functional MaterialsCollege of Material Science and EngineeringShenzhen UniversityShenzhen 518060China college of physics and Optoelectronic engineering Shenzhen UniversityShenzhen 518060China School of Science and engineering Shenzhen Institute of Aggregate Science and TechnologyThe Chinese University of Hong KongShenzhen(CUHK-Shenzhen)Shenzhen 518172China

Light-driven cancer theranostics has shown inexhaustible and vigorous vitality by virtue of its high efficacy,prominent controllability and *** of an all-round theranostic material simultaneously affording both multimodal diagnosis imaging and synergistic phototherapy would be an appealing yet significantly challenging ***,a novel nanomedicine Ir@PPEG-MeEPO was ingeniously constructed by integrating beforehand1O2-charged amphiphilic polymer and well-tailored Ir(Ⅲ)complex IrDPTP,which was featured by second near-infrared(NIR-Ⅱ)aggregation-induced emission(AIE)tendency,efficient reactive oxygen species(ROS)generation,good photothermal conversion efficiency and high-performance hydrogen gas *** the best of our knowledge,IrDPTP held the longest emission wavelength among all reported AIE Ir(Ⅲ)***,Ir@PPEG-MeEPO was capable of controllably releasing ROS via triggered photothermal effect upon NIR irradiation,making it well-adapted to hypoxic environment of *** distinctive characteristics of Ir@PPEG-MeEPO endowed it with unprecedented performance on sextuple theranostics comprised of NIR-Ⅱfluorescence-photoacoustic-photothermal trimodal imaging and photodynamic-photothermal-hydrogen trimodal therapy,witnessed by the precise tumor diagnosis and complete tumor *** study would open up new perspectives for the exploration of superior nanomedicine for practical cancer theranostics.

关键词： aggregation-induced emission NIR-II emission cancer theranostics multimodal diagnosis imaging multimodal therapy

Observation of table-like magnetocaloric effect and large refrigerant capacity in Nd_(6)Fe_(13)Pd_(1-x)Cu_(x) compounds

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Journal of Rare Earths 2022年第4期40卷 660-669,I0006页

作者： Yusong Du Chaohua Zhang Youming Lu Junqin Li Gang Cheng Jiang Wang Guanghui Rao college of Materials Science and engineering Shenzhen UniversityShenzhen 518060China college of physics and Optoelectronic engineering Shenzhen UniversityShenzhen 518060China Guangxi Key Laboratory of Information Materials Guilin University of Electronic TechnologyGuilin 541004China

The table-like magnetocaloric effect is significant for the magnetic refrigeration applications above 20 K based on the Ericsson ***,we prepared a series of Nd_(6)Fe_(13)Pd_(1-x)Cu_(x)(x=0.05,0.1,0.15)compounds by the arc-melting *** compounds show the single crystalline phase in the tetragonal Nd_(6)Fe_(13)Si-type structure with the space group I4/mcm.A magnetic phase transition from ferromagnetism to antiferromagnetism and a metamagnetic transition from the antiferromagnetic state to the ferromagnetic state are observed in each of the *** compounds exhibit table-like magnetocaloric effects with large refrigerant capacities.A constantΔSM in a temperature span of 40 K in the Nd_(6)Fe_(13)Pd_(0.85)Cu_(0.15) compound are *** a field change of 0–5 T,the peak values of–ΔS_(M) for the Nd_(6)Fe_(13)Pd_(0.95)Cu_(0.05),Nd_(6)Fe_(13)Pd_(0.90)Cu_(0.10),and Nd_(6)Fe_(13)Pd_(0.85)Cu_(0.15) compounds are estimated to be 4.8,4.6 and 4.4 J/(kg·K)with corresponding refrigerant capacity values of 323,331 and 316 J/kg,*** obtained table-like magnetocaloric effects with large refrigerant capacities as well as fairly small thermal and magnetic hysteresis deem these series of compounds good candidates for single-phase magnetic refrigeration based on the Ericsson cycle.

关键词： Rare earth-based compound Crystal structure Magnetic transition Magnetocaloric effect

B-N covalent bond-involved π-extension of multiple resonance emitters enables high-performance narrowband electroluminescence

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National Science Review 2024年第6期11卷 243-253页

作者： Xingyu Huang Jiahui Liu Yulin Xu Guohao Chen Manli Huang Mingxin Yu Xialei Lv Xiaojun Yin Yang Zou Jingsheng Miao Xiaosong Cao Chuluo Yang shenzhen Key Laboratory of New Information Display and Storage Materials College of Materials Science and EngineeringShenzhen University college of physics and Optoelectronic engineering Shenzhen University

Multi-boron-embedded multiple resonance thermally activated delayed fluorescence（MR-TADF） emitters show promise for achieving both high color-purity emission and high exciton utilization ***, their development is often impeded by a limited synthetic scope and excessive molecular weights,which challenge material acquisition and organic light-emitting diode（OLED） fabrication by vacuum deposition. Herein, we put forward a B–N covalent bond-involved π-extension strategy via post-functionalization of MR frameworks, leading to the generation of high-order B/N-based motifs. The structurally and electronically extended π-system not only enhances molecular rigidity to narrow emission linewidth but also promotes reverse intersystem crossing to mitigate efficiency roll-off. As illustrated examples, ultra-narrowband sky-blue emitters（full-width at half-maximum as small as 8 nm in n-hexane）have been developed with multi-dimensional improvement in photophysical properties compared to their precursor emitters, which enables narrowband OLEDs with external quantum efficiencies(EQEmax) of up to 42.6%, in company with alleviated efficiency decline at high brightness, representing the best efficiency reported for single-host OLEDs. The success of these emitters highlights the effectiveness of our molecular design strategy for advanced MR-TADF emitters and confirms their extensive potential in high-performance optoelectronic devices.

关键词： narrowband electroluminescence thermally activated delayed fluorescence (TADF) multiple resonance emitters ultra-high external quantum efficiency