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Influence of the cobalt concentration on optical and magnetic properties of zinc oxide

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Chinese Science bulletin 2010年第10期55卷 897-901页

作者： WANG LiWei,ZHANG FuJun,XU Zheng,ZHAO SuLing & LU LiFang institute of optoelectronics technology,beijing jiaotong university key laboratory of luminescence and optical information (beijing jiaotong university),ministry of education,beijing 100044,china institute of optoelectronics technology Beijing Jiaotong University Beijing China ministry of education Key Laboratory of Luminescence and Optical Information (Beijing Jiaotong University) Beijing China

A series of Co-doped ZnO thin films have been prepared by direct current reactive magnetron sputtering on glass *** structural characterization by means of X-ray diffraction (XrD) and scanning electron microscopy (SEM) gave no evidence of second phase *** qualitative composition and chemical state were characterized by energy dispersive X-ray spectroscopy (EDS) and X-ray photoelectronic spectrometry (XpS),*** results confirmed that Co was incorporated as Co3+,occupying the Zn2+ sites in ZnO's wurtzite *** luminescence properties of the films were investigated by room temperature photoluminescence,and the optical properties were studied by optical *** magnetic analysis was carried out at room temperature and at 50 K by Quantum Design MpMS (SQUID) *** results showed that all the Co-doped ZnO thin films prepared by direct current magnetron sputtering were not ferromagnetic above 50 K.

关键词：氧化锌钴氧化物磁性直流反应磁控溅射 X射线光电子能谱室温光致发光扫描电子显微镜纤锌矿结构

To Improve Exciplex Emission by Increasing Organic-organic Interfaces in Electroluminescent Devices

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To Improve Exciplex Emission by Increasing Organic-organic I...

2007亚洲显示国际会议

作者： Shengyi Yang Xiulong Zhang Zhidong Lou key laboratory of luminescence and optical information ministry of education institute of optoelectronic technology beijing jiaotong university beijing 100044 china

＜正＞In this paper,two ways to improve exciplex emission in electroluminescent devices based on N,N’-diphenyl-N,N’-bis （3-methylphenyl）-（1,1′-biphenyl）-4,4′-diamine （TpD） and 2-（4′-biphenyl）-5-（4″-tert-butylphenyl）-1,3,4-oxadi- azole （pbD） are *** on exciplex emission of charge carriers at the TpD/pbD interface,we have shown im- proved exciplex emission from organic light-emitting diodes （OLEDs） by inserting an incorporated pbD:TpD film be- tween the TpD layer and the pbD layer,or by increasing the number of pbD/TpD interfaces while keeping the whole thickness of the TpD layer and the pbD layer constant in the multi-layer device.

关键词： Organic Light-emitting Diodes(OLEDs) Organic-organic Interface Exciplex Emission

Influence of Yb^(3+) concentration on the upconversion luminescence of oxyfluoride material doped with Er^(3+)

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Science china(physics,Mechanics & Astronomy) 2010年第2期53卷 310-314页

作者： ZHAO SuLing1,XU Zheng1,WANG LiHui2 & S. Wageh3 1 institute of optoelectronic technology,key laboratory of luminescence and optical information (beijing jiaotong university),ministry of education,beijing 100044,china 2 Department of physics,Chinese people’s public Security university,beijing 100038,china 3 physics & Engineering Mathematics Department Faculty of Electronic Engineering Menufiya university,Menouf 32952,Egypt 1. institute of optoelectronic technology Key Laboratory of Luminescence and Optical Information (Beijing Jiaotong University) Ministry of Education Beijing 100044 China2. Department of Physics Chinese People’s Public Security University Beijing 100038 China3. Physics & Engineering Mathematics Department Faculty of Electronic Engineering Menufiya University Menouf 32952 Egypt

In this paper,a new upconversion luminescent material co-doped with Erbium and Ytterbium is reported. The upconversion luminescence transition routes and related properties are studied. The results show that the absorption and emission intensities under excitation of 980 nm laser increase with the increase of the Yb3+ concentration. The red emission is stronger than the green emission. The energy transfer process plays an important role in the upconversion mechanism.

关键词： upconversion luminescence Er3+ Yb3+

Exploring photocurrent output from donor/acceptor bulk-heterojunctions by monitoring exciton quenching

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Chinese physics b 2015年第6期24卷 271-278页

作者：王新平何志群梁春军邱海安荆西平 key laboratory of luminescence and optical information Ministry of EducationInstitute of Optoelectronic TechnologyBeijing Jiaotong University College of Chemistry and Molecular Engineering Peking University

In this work, a series of polymer bulk-heterojunctions is fabricated based on the combinations of different donors （Ds）（p3HT and pCpDTbT） and acceptors （As）（pCbM, ICbA, and F8bT）. Exciton quenching efficiencies of the D-A pairs are obtained in order to quantify charge-transfer between the donor and the acceptor via a modified approach developed in conjunction with experimental results of optical absorption and photoluminescence spectra. It is discovered that the exciton quenching efficiency in the combination of pCpDTbT：pCbM and p3HT：pCbM reaches 70% and over, but in pCpDTbT：ICbA it is about 12%. A relatively high ALUMOdonor_acceptor results in a relatively high exciton quenching efficiency, which is responsible for better charge separation. The results agreed well with the photocurrent effect of the heterojunction layers. The work offers a convenient way to predict a potentially promising photovoltaic material with a selected D-A pair.

关键词： exciton quenching optical absorption photoluminescence photocurrent

Design and Simulation on Voltage programmed a-Si TFT AMOLED pixel Circuit

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Design and Simulation on Voltage Programmed a-Si TFT AMOLED ...

2007亚洲显示国际会议

作者： Mingqing Zhang Feng Teng~* Chunjun Liang institute of optoelectronic technology key laboratory of luminescence and optical information ministry of education beijing jiaotong university beijing china

＜正＞Active matrix organic light-emitting diode（AMOLED）has attracted considerable interest in the filed of flat panel dis- plays for high ***-silicon thin-film transistors（poly-Si TFTs）employing an excimer laser annealing（ELA） have been widely considered for pixel elements for AMOLED because of their high current driving ***, the nonuniformity and maintenance of an ELA facility is a severe problem to fabricate large-size and low-cost AMOLED *** this paper a new amorphous silicon thin-film transistor（a-Si TFT）pixel circuit for the active matrix organic light-emitting diode（AMOLED）employing a voltage programming has been proposed which consists of five switching TFTs,one driving TFT,and one *** the simulation with pSpice,the influence of Vdd voltage,storage ca- pacitor（CS）and ratio of W/L of switching TFT（T3、T4、T1）,driving TFT（T2）on the output characteristics of this pixel electrode circuit were analyzed in details and then the reasonable parameters of the circuit was *** further simulation results indicate that the proposed a-Si:H TFT pixel circuit can successfully compensate the variation of OLED luminance caused by the threshold voltage,which is not consistent for difference a-Si:H TFTs and pixels of OLEDs,then the gray scale tmiformity of the screen can be improved.

关键词： Active Matrix Organic Light-emitting Diode(AMOLED) Amorphous Silicon Thin-film Transistor(a-Si:H TFT) pixel Electrode Circuit pSpice

分子束外延生长的ZnO压电薄膜及其声表面波器件特性

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发光学报 2012年第3期33卷 328-333页

作者：刘凤娟胡佐富李振军张希清北京交通大学光电子技术研究所发光与光信息技术教育部重点实验室北京100044

用rF-MbE在蓝宝石(0001)衬底上引入MgO和低温ZnO双缓冲层生长了ZnO薄膜,并制备了声表面波器件。在ZnO薄膜中,仅观测到(0002)面的XrD,且衍射峰增强,半高宽减小,表明ZnO薄膜c轴取向性更好,晶体结构更优。室温下自由激子吸收峰更尖锐和吸... 详细信息

用rF-MbE在蓝宝石(0001)衬底上引入MgO和低温ZnO双缓冲层生长了ZnO薄膜,并制备了声表面波器件。在ZnO薄膜中,仅观测到(0002)面的XrD,且衍射峰增强,半高宽减小,表明ZnO薄膜c轴取向性更好,晶体结构更优。室温下自由激子吸收峰更尖锐和吸收边更陡峭以及仅观测到自由激子发光,且发光线宽变窄、发光强度变大,表明ZnO薄膜缺陷密度减小,薄膜质量提高。测得该ZnO压电薄膜的电阻率高达4×107Ω.cm,其声表面波的速度高达5 010 m/s。

关键词： ZnO MgO缓冲层声表面波

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固态阴极射线发光的表征

物理 2008年第11期37卷 772-776页

作者：赵谡玲北京交通大学光电子技术研究所发光与光信息技术教育部重点实验室北京100044

固态阴极射线发光(SSCL)是一种全新的激发方式,是发光的一个分支.文章作者辨认了固态阴极射线发光的本质,证明了它的普适性.文章对固态阴极射线发光的本质作了进一步的分析,分析了它的发光光谱及随驱动电压提高时的变化规律,证明了固态... 详细信息

固态阴极射线发光(SSCL)是一种全新的激发方式,是发光的一个分支.文章作者辨认了固态阴极射线发光的本质,证明了它的普适性.文章对固态阴极射线发光的本质作了进一步的分析,分析了它的发光光谱及随驱动电压提高时的变化规律,证明了固态阴极射线激发既可引起激子发光,又可引起扩展态发光,扩展态的发光是激子离化后产生的电子-空穴的直接复合.文章作者还研究了固态阴极射线发光的瞬态特性及发光的衰减,证明了在它的发光波形中用传统的位相方法已不能表示固态阴极射线发光与激发电压的时间关系,并从它的两个发光峰随频率变化的明显差别提出了实测真实发光寿命的思路.

关键词：固态阴极射线发光有机电致发光激子扩展态

Overview of Several optical Technologies Applied in ITS

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Overview of Several Optical Technologies Applied in ITS

2005全国博士生学术论坛（交通运输工程学科）

作者： Luo rui, Xu Jing jing (key laboratory of all optical Network and Advanced Telecommunication Network, ministry of education, china institute of Lightwave technology, beijing jiaotong university, beijing 100044 School of Electronics and information Engineering, beijing jiaotong university, beijing 100044)

＜正＞ As we enter the 21st century, the traffic problems such as traffic accidents, traffic jams, environment pollution and etc, are more and more severe and become the social effects of pollution in global with increasing of automotive *** are two major options for addressing theses phenomena: making radically new uses of new and existing technologies and organizational structures to reduce the need for travel, or using the available capacity more efficiently and effectively. In both cases, Intelligent Transportation System （ITS） plays a major role in the implementation of the selected solutions. It has always been the most effective and ultimate solution to the modern traffic ***, optical technologies are in high speed development and have been successfully applied in many fields. recently, several developments of optical technologies have brighten the outlook on ITS. Since ITS involves a great number of research areas, this paper focuses on those we believe to be the most *** main purpose is to study the achievements attained in the last years and to give an overview of possible directions towards future research. These optical technologies involved in this paper show as follows:1. Interferometric Fiber Optic Gyroscopes （IFOG） are becoming affordable and effective for many such applications, since the measurement of rotational motion is an essential element of vehicle navigation and stabilization.2. radio - on - Fiber （rOF） technology applied in ITS communication system can realize an infrastructure for the access network which could commonly cope with several service or system configurations and be quickly and economically installed over wide *** Vehicle Detector （OVD） installed above the road performs two- way communications between the device and the vehicle having the on - vehicle communication equipment, which detects the vehicles, and is also used to communicate traffic information between the vehicle detecto

关键词： intelligent transportation system interferometric fiber optic gyroscopes radio - on - fiber optical vehicle detector

Synthesis of Eu-doped Core/Shell Vanadate Nanopartilces with Different Shell:Surface Effect on Spectral and Dynamic properties

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Synthesis of Eu-doped Core/Shell Vanadate Nanopartilces with...

第18届国际真空大会

作者： p. Zhou H.S.peng* X. H. Wang S. H. Huang key laboratory of luminescence and optical information ministry of education institute of optoelectronic technology beijing jiaotong university beijing 100044 china.

In rare earth doped nanoparticles （Nps）, luminescence is severely quenched by surface effect. Hence, surface coating is found very helpful to improve luminescence quantum yield in many nanosystems. However, the shell is critical to the improvement of luminescence of Nps, depending on its nature against the core Nps. In this paper, YVO4: Eu3+ Nps coated with two different shells, i.e., LaVO4 and YVO4, were prepared respectively. The shells both belong to zircon structure, but the mismatch values of the radius of doped Eu3+ ion versus that of Y3+ and La3+ is different. The spectral and dynamics properties are investigated in bare and core/shell Nps, and surface effect is discussed in detail.

关键词： Surface effect luminescence Core/shell Nanoparticles