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Investigation on hole mobility of FeCl3-doped 4, 4'-bis(carbazol-9-yl) -biphenyl by using space-charge-limited current model

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Guangdianzi Jiguang/Journal of Optoelectronics Laser 2014年第7期25卷 1288-1293页

作者： Yuan, Shu-Qing Zhu, Yuan-Li Wang, Zhen-Guo Hao, Yu-Ying Wang, Hua Xu, Bing-She Key Laboratory of Advanced Transducers and Intelligent Control System College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan 030024 China Key Lab of Interface Science and Engineering in Advanced Materials of Education Ministry of China Taiyuan University of Technology Taiyuan 030024 China

A series of single hole devices are designed based on the different concentrations of FeCl3 doped in 4, 4'-Bis(9H-carbazol-9-yl)biphenyl (CBP). The hole mobilities of p-type doped CBP by FeCl3 with various doping concentrations are estimated by using space-charge-limited current model, and compared with the mobility of NPB which is a kind of hole transport material commonly used in organic electroluminescence devices. The results indicate that FeCl3 doped CBP has significantly improved hole mobility. The highest hole mobility is achieved when the concentration of FeCl3 is 12%. For an electric field of 0.5 MV/cm, the estimated hole mobility of FeCl3-doped CBP with doping concentration of 12% reaches 4.5×10-5 cm2/V · s. Even in zero electric field, the hole mobility can reach 2.2×10-5 cm2/V · s, which is nearly four times of that of NPB. High efficiency organic light-emitting device is fabricated by using CBP: 12% FeCl3 as the hole transport layer. The device shows a maximum luminance of 68468 cd/m2 and a maximum current efficiency of 31.1 cd/A, which are increased by 97% and 23% compared with those of the reference device, respectively. The improvements are attributed to the balanced charge carrier transport characteristic, which results in an increased charge carrier recombination probability and a decreased triplet-polaron (T-P) annihilation probability.

关键词： Hole mobility

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Compressive sensing with tent chaotic sequence

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Sensors and transducers 2014年第2期165卷 119-124页

作者： Liu, Li Yang, Peng Zhang, Jianguo Ja, Huayu Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education Taiyuan University of Technology Taiyuan 030024 China College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan 030024 China

Compressive sensing is a new sampling theory to capture signals at sub-Nyquist rate. To guarantee exact recovery from sparse measurements, specific sensing matrix, which satisfies the Restricted Isometry Property, should be well chosen. Random matrix has been proved to meet the property with high probability;however, the practical implementation is expensive in hardware design. Chaotic matrices which generated by Logistic sequence, Chua and Lorenz dynamical systems have been verified to be Toeplitz-structured and sufficient to satisfy the property. In this paper, we propose that another chaotic sequence - Tent map can also be used to construct the sensing matrix. By numerical performance, we show that, the proposed Tent chaotic sensing matrix has similar performance to random matrix or Logistic chaotic matrix for exact reconstructing compressible signals and images from fewer measurements. © 2014 IFSA Publishing, S. L.

关键词： Compressed sensing

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Effects of Surface Roughness of Ag Thin Films on Surface-enhanced Raman Spectroscopy of Graphene: Spatial Nonlocality and Physisorption Strain

Effects of Surface Roughness of Ag Thin Films on Surface-enh...

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第三届等离激元光子学前沿国际会议

作者： Xin Liu Yuda Zhao Yang Chai Dangyuan Lei Department of Applied Physics The Hong Kong Polytechnic University Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education and College of Physics and Optoelectronics Taiyuan University of Technology

＜正＞Metallic nanostructures are widely used for surface-enhanced Raman spectroscopy（SERS）.Nanoscale surface corrugation significantly affects the localized plasmon response and the subsequent Raman intensity of th...

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The lysis of bacterial cell in oscillating electric field

The lysis of bacterial cell in oscillating electric field

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中国电子学会电路与系统学会第二十五届年会

作者： Jianfeng Jin Jianmin Qin Department of Biotechnology Delft University of TechnologyJulianalaan 1362628 BL Delftthe Netherl Key Lab of Advanced Transducers and Intelligent Control System Ministry of EducationTaiyuan Univers

A new disruption method using oscillating electric field has been developed in this *** a low voltage oscillating electric field,Eschericia coli cells were effectively disrupted and recombinant proteins were released showing enzymatic *** oscillating frequencies were tested to optimize the disruption of cells but no significant influence of frequency on cell lysis was *** method can be further developed for sterilization of beverages and diary products and used by microfluidic or high throughput screening devices to detect bio-molecules.

关键词： oscillating electric field cell disruption sterilization microfluidic device high throughput screening

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In situ SERS monitoring of photocatalytic organic decomposition using recyclable TiO2-coated Ag nanowire arrays

In situ SERS monitoring of photocatalytic organic decomposit...

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作者： Bao, Zhi Yong Liu, Xin Dai, Jiyan Wu, Yucheng Tsang, Yuen Hong Lei, Dang Yuan Department of Applied Physics Hong Kong Polytechnic University Hong Kong Hong Kong Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan China Shenzhen Research Institute Hong Kong Polytechnic University Shenzhen Hong Kong College of Material Science and Engineering Hefei University of Technology Hefei China

Recently, semiconductor and noble metal complex nanomaterials have attracted ever-increasing attention because of the realization of multiple functionalities in a single entity. In this study, Ag-TiO2 core-shell nanocomposites were synthesized by hydrolysis of butyl titanate on the surface of Ag nanowires. Due to efficient electron transfer at the Ag-TiO2 interface, the as-prepared nanocomposites exhibit much higher photocatalytic activity than bare TiO2 films, as demonstrated by the enhanced photodegradation rate of R6G and methyl blue molecules. In the meanwhile, such nanocomposites serve as a high-sensitivity surface-enhanced Raman scattering (SERS) substrate for in situ monitoring of the photocatalytic decomposition reaction, and the substrate is recyclable due to its self-cleaning function. Full-wave numerical calculations reveal that the improved photocatalysis and SERS efficiencies are attributed to the largely enhanced electromagnetic near-field in the nanocomposites. Our results point out that bifunctional semiconductor-metal hybrids hold great promise for simultaneously detecting and decomposing organic pollutants in the environment. © 2014 Elsevier B.V. All rights reserved.

关键词： Titanium dioxide

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Measurement circuit of solenoid inductance sensor

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Computer Modelling and New Technologies 2014年第12期18卷 39-45页

作者： Li, Suming Quan, Long Key Laboratory of Advanced Transducers and Intelligent Control System of Ministry of Education Taiyuan University of Technology Wanbailin DistrictTaiyuan China Institute of mechanical and Electronic Engineering China

To achieve the accurate measurement of the hydraulic valve opening position, two different measurement circuits were designed respectively for two-coil and three-coil differential solenoid inductance displacement sensors. Compared the pros and cons of their static and dynamic performances. The peripheral measurement circuit based on the AD698 was improved, so as to enhance the sensitivity of displacement detection. The different sensor measurement circuits were tested to compare the static output characteristics of these two types of sensors. The experimental results show that AD698 sensor measurement circuit is featured with small nonlinear error, high repeatability, and low hysteresis error. Sensitivity varies with the range of the measurement. When the sensor measuring ranges of conditions are defined, it is appropriate to increase sensitivity. In Valvistor hydraulic cartridge valve system, AD698 measurement circuit would be used to test the real-time dynamic detection. When the system pressure is maintained constant, the valve opening size influences the response speed of the sensor measuring circuit. The greater the pressure valve, the faster the dynamic response of the valve. The relationship between main valve displacement and flow rate is also detected in these experiments.

关键词： Inductance

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New Method to Improve Dynamic Stiffness of Electro-hydraulic Servo systems

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Chinese Journal of Mechanical Engineering 2013年第5期26卷 997-1005页

作者： BAI Yanhong QUAN Long Key Laboratory of Advanced Transducers and Intelligent Control System of Ministry of Education Taiyuan University of Technology School of Electronics Information Engineering Taiyuan University of Science and Technology

Most current researches working on improving stiffness focus on the application of control *** controller in closed-loop hydraulic control system takes effect only after the controlled position is deviated,so the control action is *** dynamic performance against force disturbance and dynamic load stiffness can’t be improved evidently by advanced control *** this paper,the elementary principle of maintaining piston position unchanged under sudden external force load change by charging additional oil is *** this basis,the conception of raising dynamic stiffness of electro hydraulic position servo system by flow feedforward compensation is put *** a scheme using double servo valves to realize flow feedforward compensation is presented,in which another fast response servo valve is added to the regular electro hydraulic servo system and specially utilized to compensate the compressed oil volume caused by load impact in *** two valves are arranged in parallel to control the cylinder ***,the model of flow compensation is derived,by which the product of the amplitude and width of the valve’s pulse command signal can be *** determination rules of the amplitude and width of pulse signal are concluded by analysis and *** the proposed scheme,simulations and experiments at different positions with different force changes are *** simulation and experimental results show that the system dynamic performance against load force impact is largely improved with decreased maximal dynamic position deviation and shortened settling *** is,system dynamic load stiffness is evidently *** paper proposes a new method which can effectively improve the dynamic stiffness of electro-hydraulic servo systems.

关键词： electro-hydraulic servo system flow feedforward compensation dynamic load stiffness double-valve actuation

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Simultaneous Excitation and Emission Enhancements in Upconversion Luminescence Using plasmonic Double-resonant Gold Nanorods

Simultaneous Excitation and Emission Enhancements in Upconve...

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第三届等离激元光子学前沿国际会议

作者： Xin Liu Dangyuan Lei Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education and College of Physics and Optoelectronics Taiyuan University of Technology Department of Applied Physics The Hong Kong Polytechnic University Shenzhen Research Institute The Hong Kong Polytechnic University

＜正＞Enhancing the quantum efficiency of lanthanide-doped upconversion nanocrystals is crucial for applying them in fluorescence imaging,biosensing and optoelectronic applications[1,2].Here we demonstrate numerically...

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Fusion modeling of the hot rolling strip width

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Journal of Computational Information systems 2014年第12期10卷 5373-5380页

作者： Tian, Jianyan Wang, Fang Qiu, Huadong Li, Wenting College of Information Engineering Taiyuan University of Technology Taiyuan 030024 China Key Lab. of Advanced Transducers and Intelligent Control Syst. at Taiyuan Univ. of Technol. Ministry of Education Taiyuan 030024 China

By organically integrating the computation formulas of hot rolling strip width mechanism model with the intelligent modeling technique, this paper proposes an intelligent fusion modeling method for a hot rolling strip width model. Due to the relations between the variations of hot rolling strip width and factors such as the chemical composition of the slabs, side compression of vertical rollers, thickness compression ratios, plate temperature, velocity and strain, and also the distinct influences by these factors mentioned afore, this paper adopts a neural network based on the improved particle swarm optimization to adjust parameters in the width mechanism model. It aims to give the mechanism model some level of self-learning and adaptive abilities, as to improve the model accuracy, broaden the range of applications, and also ensure modeling speed. In addition, in order to better control the head and tail shapes of the strip, an improvement about short stroke control has been made to the head and tail width model. Practical applications at a steelworks indicate that this method is feasible and effective by reducing width fluctuations of finished strips, raising steel yield rates and achieving favorable economical benefits. 1553-9105/Copyright © 2014 Binary Information Press.

关键词： Particle swarm optimization (PSO)

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Trimer superfluid induced by photoassocation on the state-dependent optical lattice

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Physical Review A 2014年第3期90卷 033622-033622页

作者： Wanzhou Zhang Ran Li W. X. Zhang C. B. Duan T. C. Scott College of Physics and Optoelectronics Taiyuan University of Technology Shanxi 030024 China Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education Taiyuan University of Technology Shanxi 030024 China Center for Applied Physics and Technology Peking University Beijing 100871 China College of Science Chang an University Xian 710064 China

We use the mean-field method, the quantum Monte Carlo method and the density-matrix-renormalization-group method to study the trimer superfluid phase and the quantum phase diagram of the Bose-Hubbard model in a one-dimensional optical lattice, with an explicit trimer-tunneling term. Theoretically, we derive the explicit trimer hopping terms, such as ai3†aj3, by the Schrieffer-Wolf transformation. In practice, the trimer superfluid described by these terms is driven by photoassociation. The phase transition between the trimer superfluid phase and other phases are also studied. Without the on-site interaction, the phase transition between the trimer superfluid phase and the Mott insulator phase is continuous. Turning on the on-site interaction, the phase transitions are first order with Mott insulators of atoms filling 1 and 2. With nonzero atom tunneling, the phase transition is first order from the atom superfluid to the trimer superfluid. In the trimer superfluid phase, the winding numbers can be divided by three without any remainder. The power-law decay exponent is 1/2 for the nondiagonal correlation ai†3aj3, i.e., the same as the exponent of the correlation ai†aj in hardcore bosons. The density-dependent atom-tunneling term ni2ai†aj and pair-tunneling term niai†2aj2 are also studied. With these terms, the phase transition from the empty phase to atom superfluid is first order and different from the cases without the density-dependent terms. The effects of finite three-body interactions and finite temperatures are also studied. Our results will be helpful in realizing the trimer superfluid by a cold-atom experiment.

关键词： OPTICAL lattices SUPERFLUIDITY QUANTUM Monte Carlo method RENORMALIZATION group DENSITY matrices MEAN field theory

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