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A New Promising X-Ray Storage Phosphor BaBrCl∶Eu^(2+)

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Journal of Rare Earths 2006年第4期24卷 503-505页

作者：孟宪国王永生靳辉孙力 key laboratory of luminescence and optical information Ministry of Education Institute of Optoelectronic Technology Beijing Jiaotong University Beijing 100044 China

Photostimulated luminescence was observed in X-ray irradiated BaBrCl doped with Eu^2 ＋ . It shows an emission band that peak at 413 nm, and two difference absorption spectra （DAS） bands that peak at - 550 nm and 675 nm respectively. The stimulation energy is lower than that of BaFX：Eu^2＋（X = Cl, Br）, and matches the cheaper, more portable, and more convenient semiconductor laser better. The results indicate that BaBrCl ： Eu^2＋ shows positive potential as a promising X-ray storage phosphor for practical utilization.

关键词： photostimulated luminescence color center electron trapping rare earths

Electroluminescence quenching mechanism in Rubrene doped host-guest system

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Chinese Physics B 2010年第3期19卷 563-567页

作者：闫光赵谡玲徐征张福俊孔超朱海娜宋丹丹徐叙瑢 key laboratory of luminescence and optical information(Beijing Jiaotong University) Ministry of Education Institute of Optoelectronics technology Beijing Jiaotong University

In this paper, the electroluminescence quenching mechanism in a 5,6,11,12-tetraphenylnaphthacene （Rubrene） doped host-guest system is studied by utilizing a specially designed organic light-emitting diode with an emission layer consisting of a few periodic host/guest structures. Tris-（8-hydroxyquinoline） aluminium （Alq3） and Rubrene are used as the host and the guest, respectively. The thickness variation of the guest layer in each period enables the study of the effect of molecule aggregation, and the thickness variation of the host layer suggests a long range quenching mechanism of dipole-dipole interaction. The long range quenching mechanism is a Forster process, and the FSrster radius of Rubrene is between 3 and 10 nm.

关键词： organic light-emitting diode FSrster process quenching mechanisms

Effect of TiO2 Nanotubes on Polymer-Fullerene Bulk Heterojunction Solar Cells

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Chinese Physics Letters 2007年第9期24卷 2654-2656页

作者：李妍侯延冰靳辉师全民张秀龙 key laboratory of luminescence and optical information (Ministry of Education) Institute of Optoelectronic Technology Beijing Jiao Tong University Beijing 100044

We investigate the photovoltaic properties of hybrid organ/c solar cell based on the blend of poly[2-methoxy-5-（2- ethylhexoxy-l,4-phenylenevinylene）（MEH-PPV）, C60 and titanium dioxide （TiO2） nanotubes. In comparison of the composite devices with different TiO2：[MEH-PPV ＋C60] weight ratios of lw$.% （D1-1）, 2wt.% （D1-2）, 3wt.% （D1-3）, 5wt.% （D1-4）, 10wt.% （D1-5） and 20wt.% （D1-6）, it is found that the device Dl-a exhibits the best performance. The conversion efficiency is improved by a factor of 3 compared with the MEH-PPV：C60 device.

关键词： coated conductor buffer layer self-epitaxy CeO2

Synthesis of ZnO quantum dots and their agglomeration mechanisms along with emission spectra based on ageing time and temperature

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Chinese Physics B 2016年第9期25卷 149-152页

作者：乔泊赵谡玲徐征徐叙瑢 key laboratory of luminescence and optical information Ministry of EducationBeijing Jiaotong University Institute of Optoelectronics technology Beijing Jiaotong University

The ZnO quantum dots（QDs） were synthesized with improved chemical solution *** size of the ZnO QDs is exceedingly uniform with a diameter of approximately 4.8 nm,which are homogeneously dispersed in *** optical absorption edge shifts from 370 nm of bulk material to 359 nm of QD materials due to the quantum size effect,while the photoluminescence peak shifts from 375 nm to 387 nm with the increase of the density of ZnO *** stability of ZnO QDs was studied with different dispersion degrees at 0？C and at room temperature of 25？*** agglomeration mechanisms and their relationship with the emission spectra were uncovered for the first *** the ageing of Zn O QDs,the agglomeration is aggravated and the surface defects increase,which leads to the defect emission.

关键词： ZnO quantum dots quantum blue shift agglomeration mechanism stability

Enhanced performance in organic photovoltaic devices with a KMnO_4 solution treated indium tin oxide anode modification

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Chinese Physics B 2012年第12期21卷 526-530页

作者：杨倩倩赵谡玲徐征张福俊闫光孔超樊星张妍斐徐叙瑢 key laboratory of luminescence and optical information(Beijing Jiaotong University) Ministry of Education Institute of Optoelectronics technology Beijing Jiaotong University

The properties of poly（3-hexylthiophene）：（6,6）-phenyl C61 butyric acid methyl ester （P3HT：PCBM） organic pho- tovoltaic devices （OPVs） with an indium tin oxide （ITO） anode treated by a KMnO4 solution are investigated. The optimized KMnO4 solution has a concentration of 50 rag/L, and ITO is treated for 15 min. The modification of ITO anode results in an enhancement of the power conversion efficiency （PCE） of the device, which is responsible for the increase of the photocurrent. The performance enhancement is attributed to the work function modification of the ITO substrate through the strong oxygenation of KMnO4, and then the charge collection efficiency is improved.

关键词： organic photovoltaic devices indium tin oxide anode modification KMnO4

Effects of concentration and annealing on the performance of regioregular poly(3-hexylthiophene) field-effect transistors

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Chinese Physics B 2009年第8期18卷 3568-3572页

作者：田雪雁徐征赵谡玲张福俊袁广才徐叙瑢 Institute of Optoelectronics technology Beijing Jiaotong University key laboratory of luminescence and optical information (Beijing Jiaotong University) Ministry of Education

This paper investigates the effects of concentration on the crystalline structure, the morphology, and the charge carrier mobility of regioregular poly（3-hexylthiophene）（RR-P3HT） field-effect transistors （FETs）. The RR-P3HT FETs with RR-P3HT as an active layer with different concentrations of RR-P3HT solution from 0.5 wt% to 2 wt% are prepared. The results indicate that the performance of RR-P3HT FETs improves drastically with the increase of RR-P3HT weight percentages in chloroform solution due to the formation of more microcrystalline lamellae and bigger nanoscale islands. It finds that the field-effect mobility of RR-P3HT FET with 2 wt% can reach 5.78×10^-3 cm^2/Vs which is higher by a factor of 13 than that with 0.5 wt%. Further, an appropriate thermal annealing is adopted to improve the performance of RR-P3HT FETs. The field-effect mobility of RR-P3HT FETs increases drastically to 0.09 cm^2/Vs by thermal annealing at 150 ℃, and the value of on/off current ratio can reach 104.

关键词： field-effect transistors regioregular poly(3-hexylthiophene) concentration annealing field-effect mobility

Influence of process parameters on electrochemical and physical properties of sputtered iron-doped nickel oxide thin films

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Transactions of Nonferrous Metals Society of China 2006年第6期7卷 1301-1306页

作者：黄金昭徐征李海玲亢国虎王文静 key laboratory of luminescence and optical information Ministry of EducationInstitute of Optoelectronic TechnologyBeijing Jiaotong University Beijing Solar Energy Research Institute

The iron-doped nickel oxide films used as oxygen evolution catalysts in the photoelectrochemical production of hydrogen from solar energy were deposited by means of RF reactive magnetron sputtering from a Ni-Fe alloy target in oxygen and argon *** effects of processing parameters on the film properties,such as overpotential,composition,surface morphology and preferred orientation,were *** electrochemical experiment,structural and compositional measurements indicate that the relative lower substrate temperature,higher RF power,higher working pressure and oxygen content are necessary to gain lower *** lowest overpotential of 251 mV is obtained at a current density of 80 mA/*** existence of iron,which acts as activity site,and Ni3+ ion is responsible for lowering *** analyzing SEM and XRD data,it is also noticed that an improvement in crystallinity,appropriate grain size and less crystalline phase contribute to an increased electrocatalytic activity in oxygen evolution *** results mentioned above indicate that iron-doped nickel oxide is promising as an oxygen catalyst.

关键词： iron-doped nickel oxide films overpotential photoelectrochemical

Structure,optical,and magnetic properties of Mn-doped ZnO films prepared by sputtering

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International Journal of Minerals,Metallurgy and Materials 2010年第4期17卷 475-480页

作者： Li-wei Wang Zheng Xu Fu-junZhang Su-ling Zhao Li-fang Lu Institute of Optoelectronics technology Key Laboratory of Luminescence and Optical Information （Ministry of Education of China） Beijing Jiaotong University Beijing100044 China

The microstructural, optical, and magnetic properties and room-temperature photoluminescence （PL） ofMn-doped ZnO thin films were studied. The chemical compositions were examined by energy dispersive X-ray spectroscopy （EDS） and the charge state of Mn ions in the ZnO：Mn films was characterized by X-ray photoelectronic spectrometry （XPS）. From the X-ray diffraction （XRD） data of the samples, it can be found that Mn doping does not change the orientation of ZnO thin films. All the films prepared have a wurtzite structure and grow mainly along the c-axis orientation. The grain size and the residual stress were calculated from the XRD results. The optical transmittance of the film decreases with the increase of manganese content in ZnO. The room-temperature photoluminescence of the films shows that the in- tensity of near band energy （NBE） emission depends strongly on the Mn content. The hysteresis behavior indicates that the films with the Mn content below 9at% are ferromagnetic at room temperature.

关键词： ZnO magnetron sputtering ferromagnetism optical properties photoluminescence

An optimized, sensitive and stable reduced graphene oxide–gold nanoparticle-luminol-H_2O_2 chemiluminescence system and its potential analytical application

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Chinese Physics B 2014年第4期23卷 622-628页

作者：王闻硕何大伟王继红段嘉华彭洪尚吴洪鹏富鸣王永生张希清 key laboratory of luminescence and optical information Ministry of Education Institute of Optoelectronic TechnologyBeijing Jiaotong University School of Science China University of Petroleum

The chemiluminescence （CL） performance of luminol is improved using reduced graphene oxide/gold nanoparticle （rGO-AuNP） nano-composites as catalyst. To prepare this catalyst, we propose a linker free, one-step method to in- situ synthesize rGO-AuNP nano-composites. Various measurements are utilized to characterize the resulting rGO-AuNP samples, and it is revealed that rGO could improve the stability and conductivity. Furthermore, we investigate the CL signals of luminal catalyzed by rGO-AuNP. Afterwards, the size effect of particle and the assisted enhancement effect of rGO are studied and discussed in detail. Based on the discussion, an optimal, sensitive and stable rGO-AuNP-luminon- H202 CL system is proposed. Finally, we utilize the system as a sensor to detect hydrogen peroxide and organic compounds containing amino, hydroxyl, or thiol groups. The CL system might provide a more attractive platform for various analytical devices with CL detection in the field of biosensors, bioassays, and immunosensors.

关键词： graphene nanoparticles chemiluminescence biosensers