Weiwei Chen

Fiberhome Technology Group (China)

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Xiaosheng Tang

Chongqing University

Juan Du

University of Chinese Academy of Sciences

Zhigang Zang

Chongqing University

Wei Hu

Chongqing University

Miao Zhou

Wuhan Botanical Garden

Zhiping Hu

University of Chinese Academy of Sciences

Zhengzheng Liu

Shanghai Institute of Optics and Fine Mechanics

Yuxin Leng

Shanghai Institute of Optics and Fine Mechanics

Zhiqiang Yao

China Electric Power Research Institute

Zhiqiang Zu

Chongqing University

Cooperative Institutions

Chinese Academy of Sciences

Chongqing University

University of Chinese Academy of Sciences

Zhengzhou University

Anhui Medical University

Shanghai Institute of Optics and Fine Mechanics

Henan Academy of Agricultural Sciences

First Affiliated Hospital of Anhui Medical University

China Medical University

Chinese Academy of Agricultural Sciences

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Room-temperature up-conversion random lasing from CsPbBr₃ quantum dots with TiO₂ nanotubes

Optics Letters (2019)

Xiaosheng Tang Yao Bian Zhengzheng Liu Juan Du Meng Li

We report successful room-temperature up-conversion random lasing by distributing CsPbBr3 quantum dots (QDs) uniformly into TiO2 nanotubes (NTs). In order to overcome the difficulty in purifying the QDs, TiO2 NTs were designed to collect QDs and enhance the optical multiple scattering effect. A threshold of 9.54 mJ/cm2 and narrow full width at half-maximum of 0.49 nm with a relatively high quality factor of 1089 were successfully observed. These results indicate that CsPbBr3QDs/TiO2 NTs can be high-performance up-conversion lasers for practical applications, especially when the phase matching required by conventional approaches cannot be fulfilled.

Random laser

10.1364/ol.44.004706

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Citations (16)

Vision measurement of gear pitting based on DCGAN and U-Net

Journal of Mechanical Science and Technology (2021)

Zhiwen Wang Yi Qin Weiwei Chen

Sample (material)

10.1007/s12206-021-0601-5

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Ultrathin, Core–Shell Structured SiO₂ Coated Mn²⁺‐Doped Perovskite Quantum Dots for Bright White Light‐Emitting Diodes

Small (2019)

Xiaosheng Tang Weiwei Chen Zhengzheng Liu Juan Du Zhiqiang Yao

Abstract All‐inorganic semiconductor perovskite quantum dots (QDs) with outstanding optoelectronic properties have already been extensively investigated and implemented in various applications. However, great challenges exist for the fabrication of nanodevices including toxicity, fast anion‐exchange reactions, and unsatisfactory stability. Here, the ultrathin, core–shell structured SiO 2 coated Mn 2+ doped CsPbX 3 (X = Br, Cl) QDs are prepared via one facile reverse microemulsion method at room temperature. By incorporation of a multibranched capping ligand of trioctylphosphine oxide, it is found that the breakage of the CsPbMnX 3 core QDs contributed from the hydrolysis of silane could be effectively blocked. The thickness of silica shell can be well‐controlled within 2 nm, which gives the CsPbMnX 3 @SiO 2 QDs a high quantum yield of 50.5% and improves thermostability and water resistance. Moreover, the mixture of CsPbBr 3 QDs with green emission and CsPbMnX 3 @SiO 2 QDs with yellow emission presents no ion exchange effect and provides white light emission. As a result, a white light‐emitting diode (LED) is successfully prepared by the combination of a blue on‐chip LED device and the above perovskite mixture. The as‐prepared white LED displays a high luminous efficiency of 68.4 lm W −1 and a high color‐rendering index of Ra = 91, demonstrating their broad future applications in solid‐state lighting fields.

Quantum yield

Color rendering index

10.1002/smll.201900484

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Enhancing Electromechanical Conversion and Motion-Monitoring Application of Pore-Oriented Cellulose Nanocrystal/Agarose Aerogel Modified with Flexible Heterojunction Structures

Weiwei Chen Lin Gan Ga Liu Jie Xiong Tingting Yang

Agarose

10.2139/ssrn.4895775

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CASPFuse: An Infrared and Visible Image Fusion Method based on Dual-cycle Crosswise Awareness and Global Structure-tensor Preservation

IEEE Transactions on Instrumentation and Measurement (2024)

Xuan Li R Chen Jie Wang Weiwei Chen Huabing Zhou

Sensor Fusion

10.1109/tim.2024.3509580

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Gear Pitting Measurement by Multi-Scale Splicing Attention U-Net

Chinese Journal of Mechanical Engineering (2023)

Yi Qin Dejun Xi Weiwei Chen Yi Wang

Abstract The judgment of gear failure is based on the pitting area ratio of gear. Traditional gear pitting calculation method mainly rely on manual visual inspection. This method is greatly affected by human factors, and is greatly affected by the working experience, training degree and fatigue degree of the detection personnel, so the detection results may be biased. The non-contact computer vision measurement can carry out non-destructive testing and monitoring under the working condition of the machine, and has high detection accuracy. To improve the measurement accuracy of gear pitting, a novel multi-scale splicing attention U-Net (MSSA U-Net) is explored in this study. An image splicing module is first proposed for concatenating the output feature maps of multiple convolutional layers into a splicing feature map with more semantic information. Then, an attention module is applied to select the key features of the splicing feature map. Given that MSSA U-Net adequately uses multi-scale semantic features, it has better segmentation performance on irregular small objects than U-Net and attention U-Net. On the basis of the designed visual detection platform and MSSA U-Net, a methodology for measuring the area ratio of gear pitting is proposed. With three datasets, experimental results show that MSSA U-Net is superior to existing typical image segmentation methods and can accurately segment different levels of pitting due to its strong segmentation ability. Therefore, the proposed methodology can be effectively applied in measuring the pitting area ratio and determining the level of gear pitting.

Feature (linguistics)

Net (polyhedron)

10.1186/s10033-023-00874-w

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Citations (1)

Nanocomposites of AgInZnS and graphene nanosheets as efficient photocatalysts for hydrogen evolution

Nanoscale (2015)

Xiaosheng Tang Weiwei Chen Zhiqiang Zu Zhigang Zang Ming Deng

AgInZnS–reduced graphene nanocomposites with highly efficient photocatalytic hydrogen evolution activity under visible-light irradiation were synthesized by a simple hydrothermal route.

10.1039/c5nr05145b

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Two-step method for preparing all-inorganic CsPbBr3 perovskite film and its photoelectric detection application

Materials Letters (2016)

Dongjue Liu Zhiping Hu Wei Hu Peihua Wangyang Kuai Yu

Photoelectric effect

10.1016/j.matlet.2016.10.015

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Citations (64)

Enhanced Stability and Tunable Photoluminescence in Perovskite CsPbX₃/ZnS Quantum Dot Heterostructure

Small (2017)

Weiwei Chen Jiongyue Hao Wei Hu Zhigang Zang Xiaosheng Tang

All‐inorganic perovskite CsPbX 3 (X = Cl, Br, I) and related materials are promising candidates for potential solar cells, light emitting diodes, and photodetectors. Here, a novel architecture made of CsPbX 3 /ZnS quantum dot heterodimers synthesized via a facile solution‐phase process is reported. Microscopic measurements show that CsPbX 3 /ZnS heterodimer has high crystalline quality with enhanced chemical stability, as also evidenced by systematic density functional theory based first‐principles calculations. Remarkably, depending on the interface structure, ZnS induces either n‐type or p‐type doping in CsPbX 3 and both type‐I and type‐II heterojunctions can be achieved, leading to rich electronic properties. Photoluminescence measurement results show a strong blue‐shift and decrease of recombination lifetime with increasing sulfurization, which is beneficial for charge diffusion in solar cells and photovoltaic applications. These findings are expected to shed light on further understanding and design of novel perovskite heterostructures for stable, tunable optoelectronic devices.

10.1002/smll.201604085

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CsPbBr3/CdS Core/Shell Structure Quantum Dots for Inverted Light-Emitting Diodes Application

Frontiers in Chemistry (2019)

Xiaosheng Tang Jie Yang Shiqi Li Weiwei Chen Zhiping Hu

Novel CsPbBr3/CdS core/shell structure quantum dots (QDs) were successfully synthesized using a facile hot-injection method. The corresponding CsPbBr3/CdS QDs based light-emitting diodes (QLEDs) were further prepared, which demonstrated the maximum luminance of 354 cd/m2 and an external quantum efficiency (EQE) of 0.4% with the current efficiency (CE) of 0.3 cd/A. Moreover, the optoelectronic performance of the CsPbBr3/CdS QDs based QLEDs exhibited a comparable enhancement in contrast to the pure CsPbBr3 QDs based QLEDs. Hypothetically, the novel CsPbBr3/CdS structure QDs introduced one new route for advanced light emission applications of perovskite materials.

Quantum Efficiency

10.3389/fchem.2019.00499

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Citations (39)