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Enhancing light yield of Tb^(3+)-doped fluoride nanoscintillator with restricted positive hysteresis for low-dose high-resolution X-ray imaging

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Nano Research 2023年第2期16卷 3339-3347页

作者： Yi Cheng Lei Lei Wenjuan Zhu Yubin Wang Hai Guo Shiqing Xu Key Laboratory of Rare Earth Optoelectronic Materials and Devices of Zhejiang Province Institute of Optoelectronic Materials and DevicesChina Jiliang UniversityHangzhou 310018China College of Electronic and Optical Engineering and College of Flexible Electronics(Future Technology) Nanjing University of Posts and TelecommunicationsNanjing 210023China Department of Physics Zhejiang Normal UniversityJinhua 321004China

Developing scintillators with high light yield(LY),superior irradiation stability,and weak afterglow is of significance for the realization of low-dose high-resolution X-ray excited optical luminescence(XEOL)*** doped fluoride nanoparticles possess low toxicity,superior environmental stability,facial fabrication process,and tunable emissions,which are appropriate candidates for the next generation nanoscintillators(NSs).However,the low LY and strong positive hysteresis greatly restrict their practical ***,we propose an effective strategy that engineers energy gap to significantly enhance the *** results verify that the tetragonal LiLuF4 host benefits the crystal level splitting of Tb^(3+)ions,which greatly promotes the electrons population on the Tb^(3+):5D4 level followed by the enhanced *** LY of LiLuF4:Tb@LiLuF4 NSs is calculated to be~31,169 photons/MeV,which is much higher than the lead halide perovskite colloidal CsPbBr3(~21,000 photons/MeV)and LuAG:Ce(~22,000 photons/MeV)***,the positive hysteresis is remarkably restricted after coating a thin *** X-ray detection limit and spatial resolution are measured to be~21.27 nGy/s and~7.2 lp/mm,*** further verify that this core/shell NS can be employed as scintillating screen to realize XEOL imaging under the low dose rate of 13.86μGy/*** results provide an effective route to develop high performance NSs,which will promote great opportunities for the development of low-dose high-resolution XEOL imaging devices.

关键词： nanoscintillators X-ray excited optical luminescence(XEOL)imaging crystal level splitting low-dose high-resolution

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Simulation study of nanomaterials in heat pipe enhanced high power LED heat sink 2

Simulation study of nanomaterials in heat pipe enhanced high...

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2023 2nd International Conference on Applied Mechanics and Advanced Materials, ICAMAM 2023

作者： Huang, Haibo Huang, Xiaohua Cheng, Zaijun Wang, Yuanzhang School of Optoelectronic and Communication Engineering Xiamen University of Technology Xiamen361024 China Fujian Key Laboratory of Optoelectronic Technology and Devices Xiamen361024 China

To facilitate the simulation of heat dissipation of high-power LED lamps, a set of simplified models for tubular heat pipes and carbon nanotube arrays were first established to estimate their thermal conductivity. Then several kinds of radiators were designed. The application of nanomaterials and heat pipes in the heat dissipation of lamps was studied by the finite element method. It is found that the radiator with vertical suspended fins strengthened by a heat pipe and heat dissipation coating has a better heat dissipation effect than other radiators. Finally, the simulation study of thermal interface materials and heat dissipation coatings for lamps and lanterns heat dissipation is carried out. The results show that the thermal interface materials of carbon nanotubes and carbon nano coatings can enhance the heat dissipation performance of lamps. © Published under licence by IOP Publishing Ltd.

关键词： Heat pipes

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Architecture Optimized 6×6 Optical Switch Assisted with In-Line Non-Invasive Light Monitors 16

Architecture Optimized 6×6 Optical Switch Assisted with In-...

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16th Pacific Rim Conference on Lasers and Electro-Optics, CLEO-PR 2024

作者： Fu, Xin Wang, Zhao Zou, Kai Niu, Jiaqi Meng, Yun Liu, Siwei Yang, Lin Hu, Xiaolong Institute of Semiconductors Chinese Academy of Sciences Key Laboratory of Optoelectronic Materials and Devices Beijing China School of Precision Instrument and Optoelectronic Engineering Tianjin University Tianjin China Key Laboratory of Optoelectronic Information Science and Technology Ministry of Education Tianjin300072 China

A broadband thermo-optic switch with optimized architecture is demonstrated. The switch is calibrated in a very straightforward and effective manner by in-line non-invasive light monitors without apparent extra loss o... 详细信息

ISBN: (纸本)9798350372076

关键词： Optical switches

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A–D–A’–D–A type nonfused ring electron acceptors for efficient organic solar cells via synergistic molecular packing and orientation control

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Aggregate 2024年第2期5卷 463-472页

作者： WenkuiWei Xia Zhou Shuting Pang Jiadong Zhou Xiyue Yuan Junyu Li Yuting Chen Langheng Pan Zengqi Xie Hongbin Wu Fei Huang Yong Cao Chunhui Duan Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhouChina School of New Energy Ningbo University of TechnologyNingboChina Molecular Materials and Nanosystems&Institute for Complex Molecular Systems Eindhoven University of TechnologyEindhovenThe Netherlands

Nonfused ring electron acceptors(NFREAs)are promising candidates for future commercialization of organic solar cells(OSCs)due to their simple ***,the power conversion efficiencies(PCEs)of NFREA-based OSCs have large room for *** this work,by merging end group halogenation and side chain engineering,we developed four A-D-A’-D-A type NFREAs,which we refer to as EH-4F,C4-4F,EH-4Cl,and *** crystal X-ray diffraction revealed that multiple intermolecular S⋅⋅⋅F interactions between cyclopentadithiophene and 5,6-difluoro-3-(dicyanomethylene)indanone could cause an unfavorable dimer formation,leading to ineffectiveπ-πstackings in EH-4F and C4-4F,whereas no such dimer was found in EH-4Cl and C4-4Cl after replacing with 5,6-dichloro-3-(dicyanomethylene)***,although the shorter n-butyl side chain resulted in a closer molecular packing in C4-4Cl,EH-4Cl(2-ethylhexyl substitution)with proper crystallinity exhibited enhanced face-on orientation in thin film,which is favorable for vertical charge transport and further reducing charge *** a result,a PCE of 13.0%is obtained for EH-4Cl-based OSC with a fill factor of *** work highlights the importance of molecular packing and orientation control toward future high-performance A-D-A’-D-A type NFREAs.

关键词： molecular orientation molecular packing nonfused ring electron acceptors organic solar cells structure-performance relationships

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Narrow-bandgap materials for optoelectronics applications

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Frontiers of physics 2022年第1期17卷 89-121页

作者： Xiao-Hui Li Yi-Xuan Guo Yujie Ren Jia-Jun Peng Ji-Shu Liu Cong Wang Han Zhang School of Physics&Information Technology Shaanxi Normal UniversityXi’an710119China Shenzhen Key Laboratory of Two-Dimensional Materials and Devices/Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics Collaborative Innovation Center for Optoelectronic Science and TechnologyKey Laboratory of Optoelectronic Devices and Systems of Ministry of Education and GuangdongShenzhen518060China

Narrow-bandgap materials possess the intriguing optical-electric properties and unique structures,which can be widely applied in the field of photonics,energy optoelectronic sensing and biomedicine,***,the researches on nonlinear optical properties of narrow-bandgap materials have attracted extensive attention *** this paper,we review the progress of narrow-bandgap materials from many aspects,such as background,nonlinear optical properties,energy band structure,methods of preparation,and *** materials have obvious nonlinear optical characteristics and the interaction with the short pulse laser excitation shows the extremely strong nonlinear absorption characteristics,which leads to the optical limiting or saturable absorption related to Pauli blocking and excited state ***,some of these novel narrow-bandgap materials have been utilized for the generation of ultrashort pulse that covers the range from the visible to mid-infrared wavelength ***,the study on these materials paves a new way for the advancement of optoelctronics devices.

关键词： narrow-bandgap materials saturable absorber ultrafast lasers modulator photodetectors

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Facile Synthesis and Supercapacitive Properties of PDA/UiO-66 Composites 9

Facile Synthesis and Supercapacitive Properties of PDA/UiO-6...

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9th International Conference on Advances in Machinery, Materials Science and Engineering Applications, MMSE 2023

作者： Cao, Chunhua Wang, Yazhen Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education School of Optoelectronic Materials & Technology Jianghan University Wuhan430056 China

ISBN: (纸本)9781643684383

UiO-66 in Zr-MOFs materials stands out in the research of supercapacitors due to its large specific surface, high stability and high heat resistance. In this paper, pure UiO-66 was successfully prepared using solvothermal method, and three PDA/UiO-66 composites with addition mass ratio of UiO-66 and dopamine of 2:1, 3:1 and 4:1 were prepared by autopolymerizing dopamine hydrochloride to form polydopamine at room temperature. The materials' morphology and structure were examined using SEM, TEM and XRD, and the capacitive performances were analyzed by CV and GCD. The results indicated that the capacitor properties of UiO-66 could be improved to a certain extent with the appropriate amount of polydopamine coating. The PDA/UiO-66 composite with a mass ratio of 2:1 displayed a high specific capacitance of 822.04 F/g at 1 A/g, and maintained good capacity retention even after 4000 charge/discharge cycles in a three-electrode system. These results suggested that the PDA/UiO-66 composite had great potential as a supercapacitor electrode material. © 2023 The Authors.

关键词： Supercapacitor

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Numerical design of an efficient Ho^(3+)-doped InF3 fiber laser at~3.2μm

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Journal of Electronic Science and technology 2024年第3期22卷 35-46页

作者： Shi-Yuan Zhou Hong-Yu Luo Ya-Zhou Wang Yong Liu State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu611731China DTU Electro Technical University of DenmarkKongens Lyngby2800Denmark

In this work,we theoretically unlock the potential of Ho^(3+)-doped InF3 fiber for efficient~3.2μm laser generation(from the ^(5)F_(4),^(5)S_(2)→^(5)F_(5) transition),by employing a novel dual-wavelength pumping scheme at 1150 nm and 980 nm,for the first *** clad-coupled 1150 nm pumping of 5 W,~3.2μm power of 3.6 W has been predicted with the optical-to-optical efficiency of 14.4%.Further efficient power scaling,however,is blocked by the output saturation with 980 nm *** alleviate this behavior,the cascaded ^(5)I_(5)→^(5)I_(6) transition,targeting~3.9μm,has been activated simultaneously,therefore accelerating the population circulation between the laser upper level ^(5)F_(4),^(5)S_(2) and long-lived ^(5)I_(6) level under 980 nm *** a result,enhanced~3.2μm power of 4.68 W has been obtained with optical-to-optical efficiency of 15.6%.Meanwhile the~3.9μm laser,yielding power of 2.76 W with optical-to-optical efficiency of 9.2%,is theoretically achievable as well with a moderate heat load,of which the performance is even better than the prior experimentally and theoretically reported Ho^(3+)-doped InF3 fiber lasers emitting at~3.9μm *** work demonstrates a versatile platform for laser generation at~3.2μm and~3.9μm,thus providing the new opportunities for many potential applications,e.g.,polymer processing,infrared countermeasures,and free-space communications.

关键词： Cascaded Fiber laser Holmium Mid-infrared

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Progress in the preparation and physical properties of two-dimensional Cr-based chalcogenide materials and heterojunctions

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Frontiers of physics 2024年第2期19卷 105-130页

作者： Xiulian Fan Ruifeng Xin Li Li Bo Zhang Cheng Li Xilong Zhou Huanzhi Chen Hongyan Zhang Fangping OuYang Yu Zhou School of Physics and Electronics Hunan Key Laboratory of Nanophotonics and DevicesCentral South UniversityChangsha 410083China Jincheng Research Institute of Opto-mechatronics Industry Jincheng 048000China Shanxi Key Laboratory of Advanced Semiconductor Optoelectronic Devices and Integrated Systems Jincheng 048000China School of Physical Science and Technology Xinjiang UniversityUrumqi 830046China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China

Two-dimensional transition metal dichalcogenides(TMDs)exhibit promising application prospects in the domains of electronic devices,optoelectronic devices and spintronic devices due to their distinctive energy band structures and spin−orbit coupling ***-based chalcogenides with narrow or even zero bandgap,covering from semiconductors to metallic materials,have considerable potential for wide-band photodetection and two-dimensional ***,the preparation of 2D CrX_(n)(X=S,Se,Te)nanosheets primarily relies on chemical vapor deposition(CVD)and molecule beam epitaxy(MBE),which enable the production of high-quality large-area *** review article focuses on recent progress of 2D Cr-based chalcogenides,including unique crystal structure of the CrX_(n)system,phase-controlled synthesis,and heterojunction ***,a detailed introduction of room-temperature ferromagnetism and electrical/optoelectronic properties of 2D CrXn is ***,this paper summarizes the challenges associated with utilizing 2D Cr-based chalcogenides in preparation strategies,optoelectronics devices,and spintronic devices while providing further insights.

关键词： physical properties two-dimensional materials Cr-based chalcogenide controlled synthesis heterojunction eletronic and optoelectronic devices

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Research on an automatic light field refocusing method for a camera array

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Optics Express 2025年第10期33卷 20964-20980页

作者： Pan, Yihua Zhao, Yushan Li, Yuyang Liu, Bin Chen, Ping Shanxi Key Laboratory of Intelligent Detection Technology & Equipment School of Information and Communication Engineering North University of China Shanxi Taiyuan030051 China Key Laboratory of Photoelectronic Imaging Technology System of Ministry of Education of China School of Optics and Photonics Beijing Institute of Technology Beijing100081 China State Key Laboratory of Extreme Environment Optoelectronic Dynamic Testing Technology and Instruments North University of China Shanxi Taiyuan030051 China

Light field information includes the position and angle information of light in space. A camera array is one of the methods for obtaining light field information, which combines and arranges multiple cameras in space to achieve multi-angle imaging of the same target. Based on the light field information, a computational imaging method can be used to achieve refocusing technology for a camera array (also known as optical synthetic aperture imaging technology). In this technology, by setting the focusing coefficient, the light field information can be focused on different depths. This mode is called taking photos first and focusing later. However, in order to focus on a specific object surface, traditional refocusing methods require users to manually adjust the focusing coefficient multiple times, which is time-consuming and user-unfriendly. Therefore, in this paper, we propose an automatic focusing method based on the optimal focusing coefficient map (OFCM) to address the manual refocusing problem. This method transforms the refocusing problem into obtaining the optimal focus coefficient map. In the process of solving OFCM, the threshold filtering method and the neighborhood filling method are used to optimize the results and improve the robustness of the proposed method. The experimental results show that our proposed method has higher imaging quality and faster running efficiency compared to automatic refocusing methods based on disparity maps and gradient functions. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Computational Imaging

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Regulating the dimensionality of diphosphaperylenediimide-based polymers by coordinating the out-of-plane anisotropic π-framework toward Ag^(+)

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Science China Chemistry 2022年第9期65卷 1741-1748页

作者： Zetong Ma Yujian Liu Shengdong Wang Jiadong Zhou Zhaohui Wang Wei Jiang Key Laboratory of Organic Optoelectronics and Molecular Engineering Department of ChemistryTsinghua UniversityBeijing 100084China Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou 510640China

The development of hetero-π-conjugated molecules is of significance for constructing diverse assembling superstructures based on heteroatom-related bonded or nonbonded ***,we developed one-pot P-heteroannulation via palladiumcatalyzed dual P-C bonds formation and subsequent sulfidation to construct two isomeric diphosphaperylenediimides(cis-5 and trans-5).The unique out-of-plane anisotropic π-framework induced a cumulative anisotropy with a dipole moment of up to 8.82 D for cis-5,leading to distinct supramolecular packing *** and electrochemical characterizations demonstrated that they showed the largest redshifts extending to 574 nm and rather low-lying LUMO levels of −4.41 ***,the introduced P=S moieties endowed these diphosphaperylenediimides with prominent coordination ability towards Ag^(+),and thus the first example of perylene diimide(PDI)core-involved metal-organic coordination polymers(MOCPs)with tunable dimensionality varying from 1D,2D,to 3D was tactfully *** view of easy accessibility and 2D layered porous structure,thus 2D(trans-5)·(AgOTf)based MOCP showed high crystallinity and good CO_(2) adsorption capacity with surface area of 112 m^(2)/*** result opens a span-new avenue for exploring rylene imide-based MOCPs and related properties by integrating P functionality.

关键词： metal-organic coordination polymers perylene diimides phosphorous heteroannulation dimensionality gas adsorption

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