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Three-dimensional organic cage with aggregation-induced delayed fluorescence

Chinese Chemical Letters 2021年第3期32卷 1017-1019页

作者： Yingyuan Hu Li Li Xiaoxia Wang Dongge Ma Fei Huang School of Materials Science and Engineering Dongguan University of TechnologyDongguan 523808China State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and DevicesSouth China University of TechnologyGuangzhou 510640China

A new kind of emissive small-molecular organic cage has been developed via the combination of coupling and condensation reactions,which shows outstanding solubility,structural stability and potential spatial isomeric ***,through the introduction of proper donor and acceptor units,this emissive organic cage is the first among organic cages to exhibit red aggregation-induced delayed fluorescence with photoluminescence emission at 603 *** finding not only expands the types of emissive small-molecular organic cages,but also represents an important step for further development of red delayed fluorescence materials with good solubility and aggregation-induced emission feature.

关键词： Organic cage Two-step reaction Aggregation-induced emission Delayed fluorescence Good solubility

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Design and fabrication of GeAsSeS chalcogenide waveguides with thermal annealing

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Chinese Physics B 2021年第3期30卷 320-325页

作者： Limeng Zhang Jinbo Chen Jierong Gu Yixiao Gao Xiang Shen Yimin Chen Tiefeng Xu Laboratory of Infrared Materials and Devices&Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province Research Institute of Advanced TechnologyNingbo UniversityNingbo 315211China Ningbo Institute of Oceanography Ningbo 315832China Department of Microelectronic Science and Engineering School of Physical Science and TechnologyNingbo UniversityNingbo 315211China

We reported a chalcogenide glass-based rib waveguide fabricated using photolithography and dry etching method. A commercial software(COMSOL Multiphysics) was used to optimize the waveguide structure and the distribution of the fundamental modes in the waveguide based on the complete vector finite component. We further employed thermal annealing to optimize the surface and sidewalls of the rib waveguides. It was found that the optimal annealing temperature for Ge As Se S films is 220℃, and the roughness of the films could be significantly reduced by annealing. The zero-dispersion wavelength(ZDW) could be shifted to a short wavelength around ~2.1 μm via waveguide structural optimization, which promotes supercontinuum generation with a short wavelength pump laser source. The insertion loss of the waveguides with cross-sectional areas of 4.0 μm×3.5 μm and 6.0 μm×3.5 μm was measured using lens fiber and the cut-back method. The propagation loss of the 220℃ annealed waveguides could be as low as 1.9 d B/cm at 1550 nm.

关键词： chalcogenide film dispersion engineering optical waveguide thermal annealing

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Over 18% binary organic solar cells enabled by isomerization of non-fullerene acceptors with alkylthiophene side chains

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Science China Chemistry 2022年第9期65卷 1758-1766页

作者： Ao Shang Siwei Luo Jianquan Zhang Heng Zhao Xinxin Xia Mingao Pan Chao Li Yuzhong Chen Jicheng Yi Xinhui Lu Wei Ma He Yan Huawei Hu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China Department of Chemistry Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional MaterialsEnergy Institute and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and ReconstructionHong Kong University of Science and TechnologyClear Water BayKowloonHong Kong 999077China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China Department of Physics Chinese University of Hong KongNew TerritoriesHong Kong 999077China Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou 510640China

Side-chain engineering has been demonstrated as an effective method for fine-tuning the optical,electrical,and morphological properties of organic semiconductors toward efficient organic solar cells(OSCs).In this work,three isomeric non-fullerene small molecule acceptors(SMAs),named as BTP-4F-T2C8,BTP-4F-T2EH and BTP-4F-T3EH,with linear and branched alkyl chains substituted on the α or β positions of thiophene as the side chains,were synthesized and systematically *** results demonstrate that the size and substitution position of alkyl side chains can greatly affect the electronic properties,molecular packing as well as crystallinity of the *** blending with donor polymer D18-Cl,the prominent device performance of 18.25% was achieved by the BTP-4F-T3EH-based solar cells,which is higher than those of the BTP-4F-T2EH-based(17.41%)and BTP-4F-T2C8-based(15.92%)*** enhanced performance of the BTP-4F-T3EH-based devices is attributed to its stronger crystallinity,higher electron mobility,suppressed bimolecular recombination,and the appropriate intermolecular interaction with the donor *** work reveals that the side chain isomerization strategy can be a practical way in tuning the molecular packing and blend morphology for improving the performance of organic solar cells.

关键词： organic solar cells non-fullerene acceptors side chain isomerization morphology intermolecular interaction

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Ferroelectric-controlled magnetoelectric effect at the CrI3/HfO2 interface

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Physical Review B 2024年第5期110卷 054407-054407页

作者： Tianpeng Duan Yun Zhang Jie Jiang Jingman Pang Min Liao Qiong Yang Hunan Provincial Key Laboratory of Thin Film Materials and Devices School of Materials Science and Engineering College of Physicals and Optoelectronic Technology Collaborative Innovation Center of Rare-Earth Functional Materials and Devices Development Faculty of Chemistry and Chemical Engineering

The effective manipulation magnetic properties of two-dimensional magnets through electric field presents profound implications for spintronics. In this study, we investigate the ferroelectric-controlled magnetoelectric coupling within the CrI3/HfO2(111)/CrI3 heterostructure by using first-principles calculations. It is found that the magnetic moments of CrI3 are notably responsive to the polarization orientation—either directed towards (Pin) or away (Pout) from the interface. The polarization of HfO2 triggers the accumulation (depletion) of screening electrons at the Pin (Pout) interface, which affects the relative population of the exchange-split spin bands at the interface and thus results in the enhanced (reduced) total magnetic moments of the monolayer CrI3. The easy magnetization axis of CrI3 switches from an out-of-plane (Pout state) to an in-plane (Pin state) direction by the reversal of ferroelectric polarization of HfO2. Additionally, the Curie temperature (TC) of monolayer CrI3 is enhanced by 78% in the Pout state. This work provides useful guidelines for the study of interfacial magnetoelectric coupling and design of multiferroic devices.

关键词： Ferroelectricity Magnetoelectric effect 2-dimensional systems First-principles calculations

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A High-Sensitivity Single-Beam Triaxial Atomic Magnetometer Based on Optical Fiber Transmission

A High-Sensitivity Single-Beam Triaxial Atomic Magnetometer ...

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2022 IEEE Conference on Telecommunications, Optics and Computer Science, TOCS 2022

作者： Wu, Zinan Zhang, Jialong He, Mengyang Ren, Bokang Wang, Zilong Ou, Zhonghua Yue, Huimin Zhou, Xiaojun Liu, Yong University of Electronic Science and Technology of China School of Optoelectronic Science and Engineering State Key Laboratory of Electronic Thin Films and Integrated Devices Chengdu610054 China

ISBN: (纸本)9781665470537

The SERF atomic magnetometer is nowadays the most sensitive equipment for magnetic field measurement. As used in triaxial magnetic field measurements, however, the weak interaction of the polarized atoms with the magnetic field in the pump light direction results in low sensitivity in that direction. To solve this issue, a single-beam orthogonal pumping triaxial atomic magnetometer based on a double-cell structure is demonstrated. In this paper, we use a beam-splitter to split the pumping light beam equally, so that the proposed triaxial atomic magnetometer can respond to magnetic fields in all three axes simultaneously, and with no sacrifice in sensitivity. The experiments have shown that the magnetometer has a sensitivity of 46fT/Hz1/2 on the x-axis, 32fT/Hz1/2 on the y-axis, and 40fT/Hz1/2 on the z-axis. This magnetometer has great potential for applications where the three components of the magnetic field need to be measured. © 2022 IEEE.

关键词： Optical pumping

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Wearable ultrasensitive and rapid human physiological monitoring based on microfiber Sagnac interferometer

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Science China(Information Sciences) 2024年第3期67卷 281-290页

作者： Xin WANG Hongyou ZHOU Meihua CHEN Yongcheng HE Zhishen ZHANG Jiulin GAN Zhongmin YANG State Key Laboratory Luminescent Materials and Devices Institute of Optical Communication MaterialsSpecial Glass Fiber and Device Engineering Technology Research and Development Center of Guangdong ProvinceGuangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesSouth China University of Technology Guangdong-Hong Kong-Macao Joint Laboratory for Intelligent Micro-Nano Optoelectronic Technology Foshan University

High-sensitive and fast-responding flexible strain sensors are essential for the smart wearable devices that precisely and dynamically perceive the weak deformations induced by human physiological signals. Here, a flexible strain sensor via polydimethylsiloxane(PDMS)-encapsulated microfiber Sagnac interferometer was designed and prepared for monitoring the human pulse signals and sound vibrations. The sensor achieved a record-breaking sensitivity(gauge factor, GF = 9977) and an extremely low detection limit(0.00025%) due to the strong polarization-dependent coupling effect in the microfiber coupler and the polarization-mixing effect in the Sagnac loop. The relative intensity demodulation method also enabled a fast response time of 10 μs. The wearable pulse measurements were implemented by attaching this flexible strain sensor directly to human skin at various locations and the waveform details were accurately captured. Taking advantage of the ultra-high sensitivity and fast response performance of the prepared sensor, the real-time dynamic acquisition of the underwater weak signal, such as the hydro-acoustic waves with a wide range of 20 Hz–16.86 k Hz, has been demonstrated. These initial results pave the way for a new and innovative category of underwater wearable devices with rapid detection of human physiological signals and weak environmental vibrations.

关键词： flexible strain sensor microfiber Sagnac interferometer underwater detection

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Spectral polarization-encoding of broadband laser pulses by optical rotatory dispersion and its applications in spectral manipulation

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Chinese Physics B 2021年第7期30卷 556-561页

作者： Xiaowei Lu Congying Wang Xuanke Zeng Jiahe Lin Yi Cai Qinggang Lin Huangcheng Shangguan Zhenkuan Chen Shixiang Xu Jingzhen Li Shenzhen Key Laboratory of Micro-Nano Photonic Information Technology Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronics EngineeringShenzhen UniversityShenzhen 518060China Collaborative Innovation Center for Optoelectronic Science and Technology International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology(Ministry of Education)Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China

We propose a kind of spectral polarization-encoding(SPE)for broadband light pulses,which is realized by inducing optical rotatory dispersion(ORD),and decoded by compensating *** with polarization-sensitive devices,SPE can not only work to control polarization-dependent transmission for central wavelength or bandwidth-tunable filtering,but also can be used for broadband regenerative or multi-pass amplification with a polarization-dependent gain medium to improve output *** is entirely passive thus very simple to be designed and *** using an ORD crystal with a good transmission beyond 3-μm mid-infrared region,e.g.,Ag Ga S_(2),SPE promises to be applied for the wavelength tuning lasers in mid-infrared region,where the tunning devices are rather under developed compared with those in visible and near-infrared region.

关键词： ultrafast optics optical rotatory dispersion spectral polarization-encoding spectral manipulation

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Triazine and Porphyrin-Based Cross-Linked Conjugated Polymers:Protonation-Assisted Dissolution and Thermoelectric Properties

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CCS Chemistry 2021年第11期3卷 2688-2695页

作者： Ling-Ling Wang Qing-Lin Jiang Duo-Kai Zhao Qing-Lei Zhang Yan-Hua Jia Cheng Gu De-Hua Hu Yu-Guang Ma Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou 510640

As two pivotal functional segments,triazine and porphyrin can be coupled to form a highly cross-linked conjugated *** the obtained conjugated polymers are almost insoluble in most solvents,a small amount of protonic acid can cause the formation of a colloidal solution of *** dissolution process has proved to be a surface charge effect induced by protonation of porphyrin units in the polymer ***-quality conjugated polymer films have been prepared on diverse substrates by solution drop-casting and then used for thermoelectric(TE)*** films exhibit remarkable TE performance with high Seebeck coefficients(−6650μV K^(−1))and electronic conductivities(0.042 S cm^(−1)),yielding a power factor of 185μW m^(−1) K^(−2),which,collectively,are the highest among all reported n-type organic TE *** work may pave the way for the design and development of solution-processed,cross-linked polymer films as promising TE materials.

关键词： cross-linked conjugated polymers protonation-assisted dissolution triazine porphyrin thermoelectric

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A Numerical Investigation on the Influence of the Circular Ring on the Aerodynamic Noise Generated by a Cooling Fan

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Fluid Dynamics & Materials Processing 2023年第1期19卷 1-14页

作者： Jun Feng Tao Bian Qianpeng Han Bing Wang State Key Laboratory of Precision Blasting Jianghan UniversityWuhan430056China School of Intelligent Manufacturing Jianghan UniversityWuhan430056China Key Laboratory of Optoelectronic Chemical Materials and Devices Ministry of EducationSchool of Chemical and Environmental EngineeringJianghan UniversityWuhan430056China Institute for Interdisciplinary Research Jianghan UniversityWuhan430056China Guangdong HUST Industrial Technology Research Institute Dongguan523429China

The influence of the width of the circular ring of a car cooling fan on the aerodynamic noise is investigated numerically through the determination of the overall sound pressure level(OASPL).The results demonstrate that when the circular rings cover near 2/3 of the width of the blade tips of the rotor in the axis direction,the rotor has the lowest OASPL and the related total pressure efficiency and flow mass rate are better than the corresponding values obtained for a reference rotor without a circular *** increasing the width of the circular ring in the axis direction,the tip vortex around the trailing edge of the blade tip becomes smaller and finally ***,a separated flow field arises gradually and then grows in size around the middle of the junction of the blade tips with the *** the circular rings cover nearly 2/3 s of the width of the blade tips of the fan in the axis direction,the extension of the separated flow around the blade’s tip attains a minimum.

关键词： Cooling fan width of the circular ring aerodynamic noise CFD simulation

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Laser-Induced Recoverable Fluorescence Quenching of Perovskite Films at a Microscopic Grain Scale

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Energy & Environmental Materials 2022年第4期5卷 1189-1199页

作者： Yuren Xiang Yameng Cao Wenqiang Yang Rui Hu Sebastian Wood Bowei Li Qin Hu Fan Zhang Jujie He Mozhgan Yavari Jinlai Zhao Yunlong Zhao Jun Song Junle Qu Rui Zhu Thomas P.Russell S.Ravi P.Silva Wei Zhang Center for Biomedical Optics and Photonics(CBOP)&College of Physics and Optoelectronic Engineering Key Laboratory of Optoelectronic Devices and SystemsShenzhen UniversityShenzhen 518060China Advanced Technology Institute University of SurreyGuildford GU27XHUK National Physical Laboratory Hampton RoadTeddington TW110LWUK Department of Polymer Science and Engineering University of MassachusettsAmherst MA 01003USA State Key Laboratory for Artificial Microstructure and Mesoscopic Physics School of PhysicsPeking UniversityBeijing 100871China College ofmaterials science and engineering Shenzhen Key laboratory of Polymer Science and TechnologyGuangdong Research Center for interfacial Engineering of FunctionalMaterialsShenzhen UniversityShenzhen 518060China

Understanding the fundamental properties of metal-halide perovskite materials is driving the development of novel optoelectronic ***,we report the observation of a recoverable laser-induced fluorescence quenching phenomenon in perovskite films with a microscopic grain-scale restriction,accompanied by spectral *** fluorescence quenching depends on the laser intensity and the dwell time under Auger recombination dominated *** features indicate that the perovskite lattice deformation may take the main responsibility for the transient and show a new aspect to understand halide perovskite *** further modulate this phenomenon by adjusting the charge carrier recombination and extraction,revealing that efficient carrier transfer can improve the bleaching resistance of perovskite *** results provide future opportunities to attain high-performance devices by tuning the perovskite lattice disorder and harvesting the energetic carriers.

关键词： fluorescence quenching perovskite photophysics stability

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