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Constructing multifunctional deep-blue emitters with weak charge transfer excited state for high-performance non-doped blue OLEDs and single-emissive-layer hybrid white OLEDs

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Chinese Chemical Letters 2024年第10期35卷 175-179页

作者： Hui Liu Xiangyang Tang Zhuang Cheng Yin Hu Yan Yan Yangze Xu Zihan Su Futong Liu Ping Lu State Key Laboratory of Supramolecular Structure and Materials Department of Chemistry Jilin UniversityChangchun 130012China Sichuan Province Key Laboratory of Information Materials and Devices Application College of Optoelectronic EngineeringChengdu University of Information TechnologyChengdu 610225China

Deep-blue emitter with high photoluminescence efficiency(PLQY)is highly desirable in ultra-high definition displays and white solid-state *** this work,two deep-blue phenanthro[9,10]imidazole derivatives,PPIS and PPPIS,with hot exciton property are successfully *** to PPIS,the embedded phenyl bridge in PPPIS is able to effectively increase the overlap of frontier molecular *** consequence,PPPIS shows higher oscillator strength and significantly enhanced *** also achieves better electroluminescence performance in non-doped device,showing deep-blue emission with Commission International de l’Eclairage(CIE)coordinates of(0.153,0.087)and the maximum external quantum efficiency(EQEmax)of 8.5%with minuscule efficiency ***,when PPPIS serves as the host for phosphor PO-01,high-efficiency orange phosphorescent device is obtained with high EQEmax of 29.8%and negligible efficiency roll-off at 1000 cd/m^(2).Further,efficient single-emissive-layer white device is assembled via utilizing PPPIS as a blue emitter as well as the host for PO-01 simultaneously,providing warm-white emission with CIE coordinates of(0.429,0.433)at 1000 cd/m^(2),the forward-viewing EQEmaxof 27.2%and maximum power efficiency(PEmax)of 80.1 lm/W,*** studies can establish a viable design strategy for deep-blue emitters in high-performance non-doped blue OLEDs and hybrid WOLEDs.

关键词： Deep-blue emitters Phenanthro[9,10]imidazole Hot exciton Host Single-emissive-layer white device

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XK-III: A new three-degree-of-freedom omnidirectional moving spherical robot 2

XK-III: A new three-degree-of-freedom omnidirectional moving...

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2nd International Conference on robotics, Artificial Intelligence and Intelligent Control, RAIIC 2023

作者： Lin, Rui Yang, Xin Zhang, Yu Yang, Ruilin Li, Ruilin Southwest University of Science and Technology Robot Technology Used for Special Environment Key Laboratory of Sichuan Province Mianyang China

ISBN: (纸本)9798350328004

The unique motion mode and shape structure of spherical robot make it have high flexibility in complex and narrow environment. The existing spherical robot has the problems of high difficulty in control and large turning radius. Therefore, this paper designs a spherical robot with three-degree-of-freedom omnidirectional movement capability: XK-III. This paper innovatively designs a rotating mechanism around the OZ axis. Based on this structure, we designed the first sports mode (FSM) and the second sports mode (SSM) of XK-III. Then, the kinematics and dynamics specification model of XK-III spherical robot is established. Finally, the validity of the structural and dynamic models of XK-III is verified by using PID controller, active disturbance rejection controller and linear quadratic regulator. It provides an application idea for the application of spherical robots in complex environments. © 2023 IEEE.

关键词： Sports

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The water-soluble bicyclic 2-pyridone-based fluorescent probe for fast and selective detection of hypochlorite

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Chinese Chemical Letters 2023年第6期34卷 432-436页

作者： Qian Zhou Shanqiang Wang Xiaoyun Ran Linzhi Shen Xiaolin Luo Gui Wang Hui Yang Zhouyu Wang Xiaoqi Yu Asymmetric Synthesis and Chiral Technology Key Laboratory of Sichuan Province Research and Application of Small Organic Chiral Molecules Key Laboratory of Yibin CityDepartment of ChemistryXihua UniversityChengdu 610039China School of Food and Bioengineering Xihua UniversityChengdu 610039China Key Laboratory of Green Chemistry and Technology Ministry of EducationCollege of ChemistrySichuan UniversityChengdu 610064China

As a strong oxidizer,hypochlorite(Cl O^(-))are widely employed as bleaching agents and *** of ClO^(-)is required to ensure bactericidal effects and avoid hazards caused by excessive residual ***,the derivative bicyclic 2-pyridone,namely DHIP-Py,was prepared successfully to establish a new ClO^(-)-quantitative *** probe exhibits excellent Cl O^(-)selectivity over other ROS and anions/cations,high sensitivity(LOD=1.32μmol/L),fast response(<5 s),and wide-p H tolerance(pH4~10).Benefit from its good water solubility,DHIP-Py is well suited for water sample analysis and has been successfully applied to detect Cl O^(-)in real-world food and environmental samples,including tap water,bottled water and river *** detection results were essentially identical to that of obtained from traditional DPD ***,visual detection of Cl O^(-)via filter paper-based solid sensor and imaging of ClO^(-)in Escherichia coli were also achieved by *** satisfactory results demonstrate that this bicyclic 2-pyridone-based hypochlorite probe is a promising free chlorine chemosensor with great potential for analytical applications.

关键词： Fluorescent probe Hypochlorite Bicyclic 2-pyridone Tap water Bioimaging

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Particle Filter Method Based on Angle of Arrival for Seeking Radioactive Source

Particle Filter Method Based on Angle of Arrival for Seeking...

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International Conference on Guidance, Navigation and Control, ICGNC 2022

作者： Xie, Yuehui Teng, Mingbo Wan, Pengcheng Xiao, Yufeng Robot Technology Used for Special Environment Key Laboratory of Sichuan Province Southwest University of Science and Technology Mianyang621010 China

ISBN: (纸本)9789811966125

To find out a lost radioactive source, a particle filter method based on Angle of Arrival (AOA) is proposed in this paper. Firstly, a particles set is constructed to describe the source location and intensity. Secondly, the AOA is introduced into particle update process before the process of the normalization, resampling and adaptive update. Finally, the particle filtering ends when convergence condition is satisfied, and the source position is estimated with weighted summation of the particle. Simulation experiments show that the proposed method can help a robot to seek a source with unknown position. Moreover, contrast with existing research results, it behaved more efficiently and was suitable for larger detection areas. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Monte Carlo methods

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Hierarchical Control Method for Multi-robot Formation

Hierarchical Control Method for Multi-robot Formation

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International Conference on Guidance, Navigation and Control, ICGNC 2022

作者： Jiamin, Fan Jianwen, Huo Ying, Luo Yufeng, Xiao Robot Technology Used for Special Environment Key Laboratory of Sichuan Province Southwest University of Science and Technology Mianyang621010 China

ISBN: (纸本)9789811966125

The difficulty for multi-robots to adapt their formation in an uncertain environment is a considerable issue. In this study, we propose a hierarchical multi-robot formation control algorithm. The proposed algorithm is composed of a strategy layer, logic layer, tactical layer, and an execution layer. The algorithm form multi-robots efficiently and methodologically. The logic layer adopts the finite-state machine theory to design multi-robot formation switching states, which realizes the state transition according to the instructions of the strategy layer and robot execution signals. The tactical layer designs the control law of the formation switching movement and the different formations to maintain the movement, which adopts the dynamic window method to design the anti-collision strategy in the formation process. In this study, simulation experiments were conducted in a complex environment to verify the correctness and feasibility of the proposed algorithm. Moreover, physical experiments were performed in real scenes to further verify the effectiveness and stability of the proposed algorithm. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Industrial robots

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Using Load Transient Waveform to Analyze Fault Propagation Mechanism in DC-DC Switching Power Supply

Using Load Transient Waveform to Analyze Fault Propagation M...

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2024 Photonics and Electromagnetics Research Symposium, PIERS 2024

作者： Wan, Junliang Yu, Pengfei Cai, Qiang-Ming Cao, Xin Zhou, Longjian Li, Haoran Zhu, Yuyu Fan, Jun Laboratory of Science and Technology on Reliability Physics and Application of Electronic Component Guangzhou China Southwest University of Science and Technology School of Information Engineering Mianyang China Robot Technology Used for Special Environment Key Laboratory of Sichuan Province Mianyang China Tianfu Institute of Research and Innovation China

ISBN: (纸本)9798350375909

The degradation of certain components within DC-DC power supplies can lead to abnormal performance, resulting in the occurrence of faults. The degradation of components can cause changes in output voltage and current, and the different degradation characteristics of components have different impacts on the characteristics of output parameters. Therefore, it is necessary to master this impact relationship, that is, the fault propagation mechanism can be used to effectively diagnose faults and manage health. Studying the fault propagated mechanism is an important prerequisite for fault diagnosis. Output terminals of DC-DC power supply are usually connected in parallel with electrolytic capacitors. The function of electrolytic capacitors is to filter, filtering out most of the AC part of the output voltage, and reducing the ripple of the output voltage. Electrolytic capacitors are the most vulnerable components to failure in switching power supplies, with approximate 60% of failed components being electrolytic capacitors. Therefore, the fault propagation mechanism of electrolytic capacitors is a key research topic. Most research focuses on the fault propagation mechanism based on steady-state output signals. This article studies the fault propagation mechanism based on transient output signals. Through experimental testing, the impact of parameter degradation of electrolytic capacitors on the transient waveform of output voltage and the mapping relationship between capacitor degraded parameters and transient waveform are studied. The method is to analyze the voltage waveform when the current step changes using equivalent degradated experiments of capacitors. Its advantage lies in the fact that transient waveforms are more sensitive than steady-state waveforms and require lower sampling rates, making it easier to analyze the degradated characteristics of electrolytic capacitors. For power supplies with simple structures, data is collected through simulation. For commerc

关键词： Capacitor bank

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Microscopic origin and relevant grain size effect of discontinuous grain growth in BaTiO_(3)-based ferroelectric ceramics

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Journal of Materials Science & technology 2023年第33期164卷 119-128页

作者： Hong Li Bo Wu Cong Lin Xiao Wu Tengfei Lin Min Gao Hong Tao Wenjuan Wu Chunlin Zhao College of Materials Science and Engineering Fuzhou UniversityFuzhou 350108China Physics Department Southwest Minzu UniversityChengdu 610041China Sichuan Province Key Laboratory of Information Materials and Devices Application Chengdu University of Information TechnologyChengdu 610225China

Barium titanate[BaTiO_(3)(BT)]-based ceramics are typical ferroelectric ***,the discontinuous grain growth(DGG)and relevant grain size effect are deeply *** obvious DGG phenomenon is observed in a paradigmatic Zr^(4+)-doped BT-based ceramic,with grains growing from∼2.2–6.6 to∼121.8–198.4μm discontinuously near 1320℃.It is found that fine grains can get together and grow into large ones with liquid phase surrounding them above eutectic *** the grain boundary density(D g)is quantitatively studied and shows a first-order reciprocal relationship with grain size,and the grain size effect is dependent on D *** grains lead to high D g,and then cause fine domains and pseudocubic-like phase structure because of the interrupted long-range ferroelectric orders by grain *** D g also causes the diffusion phase transition and low Curie dielectric peak due to the distribution of phase transition temperature induced by internal *** domain switching experiments reveal that the polarization orientation is more difficult near the grain boundary,implying that the grain boundary inhibition dominates the process of polarization orientation in fine-grain ceramics,which leads to low polarization but a high coercive ***,large-grain ceramics exhibit easy domain switching and high&similar *** work reveals that the grain boundary effect dominates the grain size effect in fine-grain ceramics,and expands current knowledge on DGG and grain size effect in polycrystalline materials.

关键词： BT-based ferroelectric ceramics Discontinuous grain growth Grain boundary density Grain size effect on structure/property Microscopic origin

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Manipulating Zr/Ti ratio based on phase diagram for large electrocaloric effects with multiple target operation temperatures in PLZT ceramics

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Journal of Advanced Ceramics 2024年第9期13卷 1422-1431页

作者： Junjie Li Ruowei Yin Zhe Xiong Yizheng Bao Xing Zhang Wenjuan Wu Lezhong Li Yang Bai Sichuan Province Key Laboratory of Information Materials and Devices Application College of Optoelectronic Engineeringand Chengdu IC Valley Industrial CollegeChengdu University of Information TechnologyChengdu 610225China Beijing Advanced Innovation Center for Materials Genome Engineering and Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Chengdu Hongming Electronics Co. Ltd.Chengdu 610199China Key Laboratory of Inorganic Functional Materials and Devices Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201800China Sichuan Meteorological Optoelectronic Sensor Technology and Application Engineering Research Center Chengdu University of Information TechnologyChengdu 610225China

Ferroelectric phase transition has been identified as a promising avenue for designing high-performanceelectrocaloric materials for zero-emission and solid-state refrigeration. However, extensive research has been limited todeveloping ferroelectric materials with large electrocaloric effects near room temperature, preventing them from meetingdiverse refrigeration requirements. In this study, by leveraging the room-temperature phase diagram of the (PbLa)(ZrTi)O_(3)solution, we prepared a series of Pb_(0.775)La_(0.15)Zr_(x)Ti_(1−x)O_(3) bulk ceramics spanning the ferroelectric and relaxor ferroelectricphase regions. This enabled the attainment of various phase transition features and temperatures. Finally, largeelectrocaloric effects, coupled with adjustable operation temperatures ranging from 150 to −45℃, are successfullyachieved through manipulation of the Zr/Ti ratio. This comprehensive range of operation temperatures effectively addressesdiverse refrigeration application requirements, ranging from industrial equipment to freezer cabinets. This work not onlyunderscores the expansion of the electrocaloric refrigeration application domain but also proposes a material designstrategy tailored to meet these evolving demands.

关键词： electrocaloric effect phase transition phase diagram ferroelectric ceramics

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Design of high-frequency test fixture considering impedance matching

Design of high-frequency test fixture considering impedance ...

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2023 International Conference on Mechatronic Engineering and Artificial Intelligence, MEAI 2023

作者： Peng, Yi Cai, QiangMing Yang, Lanqing Cao, Xin Zhou, Longjian Li, Haoran Zhu, Yuyu School of Information Engineering Southwest University of Science and Technology Mianyang China Robot Technology Used for Special Environment Key Laboratory of Sichuan Province Mianyang China Mianyang China

ISBN: (纸本)9781510674608

This paper presents the design of a high-frequency test fixture for high-speed connectors. Specifically, after analyzing and designing the board material, laminate structure, trace structure, and signal via structure, the impedance consistency and bandwidth of the high-speed interconnect structure are verified through TDR and S-parameter simulations conducted in HFSS. a PCB layout is generated using Cadence. The test results confirm that the differential impedance of the fixture meets the requirements for high-speed connector testing. Within the frequency range of 0-30 GHz, the difference between S11 and S21 for the 2x-thru structure is greater than 0 dB, indicating a bandwidth capability of up to 30 GHz for the fixture. © 2024 SPIE.

关键词： Bandwidth

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Dynamic SLAM algorithm based on reprojection error and depth estimation

Dynamic SLAM algorithm based on reprojection error and depth...

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2023 International Conference on Automation Control, Algorithm, and Intelligent Bionics, ACAIB 2023

作者： Deng, Ziben Huang, Pengcheng Bai, Keqiang School of Information Engineering Southwest University of Science and Technology China Fund of Robot Technology Used for Special Environment Key Laboratory of Sichuan Province China

ISBN: (纸本)9781510667662

In order to improve the SLAM accuracy of robots in dynamic scenes and realize the tracking of dynamic objects, this paper proposed a dynamic objects recognition method based on reprojection error and depth estimation. Firstly, recognize objects by semantic segmentation and calculate reprojection error of objects between adjacent frames to filter out dynamic objects. Then, estimate the depth of objects to improve the recognition accuracy. Finally, complete SLAM and real-time estimation of dynamic objects pose according to static background and objects. Results of experiments on KITTI datasets show that the algorithm can effectively improve the recognition accuracy of dynamic objects and ameliorate the SLAM accuracy in dynamic scenes. © 2023 SPIE.

关键词： Semantics

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