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Enhancement of Frster energy transfer from thermally activated delayed fluorophores layer to ultrathin phosphor layer for high color stability in non-doped hybrid white organic light-emitting devices

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Chinese physics B 2017年第4期26卷 404-410页

作者：王子君赵娟周畅祁一歌于军胜 State key laboratory of Electronic Thin Films and Integrated devices School of Optoelectronic InformationUniversity of Electronic Science and Technology of China(UESTC)Chengdu 610054China school of Chemistry Sun Yat-sen UniversityGuangzhou 510275China

Fluorescence/phosphorescence hybrid white organic light-emitting devices（WOLEDs） based on double emitting layers（EMLs） with high color stability are *** simplified EMLs consist of a non-doped blue thermally activated delayed fluorescence（TADF） layer using 9,9-dimethyl-9,10-dihydroacridine-diphenylsulfone（DMAC-DPS） and an ultrathin non-doped yellow phosphorescence layer employing bis[2-（4-tertbutylphenyl）benzothiazolato-N,C2＇]iridium（acetylacetonate）（（tbt）_2Ir（acac））.Two kinds of materials of 4,7-diphenyl-1,10-phenanthroline（Bphen） and 1,3,5-tris（2-Nphenylbenzimidazolyl） benzene（TPBi） are selected as the electron transporting layer（ETL）,and the thickness of yellow EML is adjusted to optimize device *** device based on a 0.3-nm-thick yellow EML and Bphen exhibits high color stability with a slight Commission International de l＇Eclairage（CIE） coordinates variation of（0.017,0.009） at a luminance ranging from 52 cd/m^2 to 6998 cd/m^*** TPBi-based device yields a high efficiency with a maximum external quantum efficiency（EQE）,current efficiency,and power efficiency of 10%,21.1 cd/A,and 21.3 lm/W,*** ultrathin yellow EML suppresses hole trapping and short-radius Dexter energy transfer,so that Forster energy transfer（FRET）from DMAC-DPS to（tbt）_2Ir（acac） is dominant,which is beneficial to keep the color *** employment of TPBi with higher triplet excited state effectively alleviates the triplet exciton quenching by ETL to improve device efficiency.

关键词： white organic light-emitting devices non-doped emitting layers thermally activated delayed fluo-rescence color stability

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nanowrinkled Carbon Aerogels Embedded with FeN_(x) Sites as Effective Oxygen Electrodes for Rechargeable Zinc-Air Battery

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Research 2019年第1期2019卷 1-13页

作者： Ting He Bingzhang Lu Yang Chen Yong Wang Yaqiang Zhang John L.Davenport Alan P.Chen Chih-Wen Pao Min Liu Zhifang Sun Alexander Stram Alexander Mordaunt Jairo Velasco Jr Yuan Ping Yi Zhang Shaowei Chen State key laboratory for Powder Metallurgy College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China Department of Chemistry and Biochemistry University of California1156 High StreetSanta CruzCalifornia 95064USA Department of Chemical and materials Engineering University of AlbertaEdmontonAlbertaCanada T6G 1H9 Department of physics University of California1156 High StreetSanta CruzCalifornia 95064USA X-Ray Absorption Group National Synchrotron Radiation Research CenterHsinchu 30076Taiwan Institute of Super-microstructure and Ultrafast Process in Advanced materials School of Physics and ElectronicsCentral South UniversityChangsha 410083China key laboratory of materials Processing and Mold(Zhengzhou University) Ministry of EducationZhengzhou 450002China

Rational design of single-metal atom sites in carbon substrates by a flexible strategy is highly desired for the preparation of high-performance catalysts for metal-air *** this study,biomass hydrogel reactors are utilized as structural templates to prepare carbon aerogels embedded with single iron atoms by controlled *** tortuous and interlaced hydrogel chains lead to the formation of abundant nanowrinkles in the porous carbon aerogels,and single iron atoms are dispersed and stabilized within the defective carbon skeletons.X-ray absorption spectroscopy measurements indicate that the iron centers are mostly involved in the coordination structure of FeN_(4),with a minor fraction(ca.1/5)in the form of FeN_(3)***-principles calculations show that the FeN_(x) sites in the Stone-Wales configurations induced by the nanowrinkles of the hierarchically porous carbon aerogels show a much lower free energy than the normal *** resulting iron and nitrogen-codoped carbon aerogels exhibit excellent and reversible oxygen electrocatalytic activity,and can be used as bifunctional cathode catalysts in rechargeable Zn-air batteries,with a performance even better than that based on commercial Pt/C and RuO_(2) *** from this study highlight the significance of structural distortions of the metal sites in carbon matrices in the design and engineering of highly active single-atom catalysts.

关键词： Oxygen charge skeleton

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Current advancements on charge selective contact interfacial layers and electrodes in flexible hybrid perovskite photovoltaics

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Journal of energy Chemistry 2021年第3期30卷 151-173页

作者： Gopalan Saianand Prashant Sonar Gregory J.Wilson Anantha-Iyengar Gopalan Vellaisamy A.L.Roy Gautam E.Unni Khan Mamun Reza Behzad Bahrami K.Venkatramanan Qiquan Qiao Global Centre for Environmental Remediation(CCER) Faculty of ScienceThe University of NewcastleCallaghan 2308New South WalesAustralia CSIRO energy Newcastle Energy Centre10 Murray Dwyer CctMayfield WestNSW 2304Australia school of Chemistry and physics Queensland University of Technology(QUT)2 George StreetBrisbaneQLD 4001Australia Centre for Material Science Queensland University of Technology(QUT)BrisbaneQLD 4000Australia Daegyeong Regional Infrastructure Technology Development Center Kyungpook National UniversityDaegu 41566Republic of Korea James Watt school of Engineering University of GlasgowG128QQUnited Kingdom Facufty of Engineering and Built Environment The University of NewcastleCallaghan 2308New South WalesAustralia Department of Electrical Engineering Center for Advanced PhotovoltaicsSouth Dakota State UniversityBrookings 57007South DakotaUSA Department of physics SCSVMV Deemed UniversityKanchipuram 631561Tamil NaduIndia

Perovskite-based photovoltaic materials have been attracting attention for their strikingly improved performance at converting sunlight into *** beneficial and unique optoelectronic characteristics of perovskite structures enable researchers to achieve an incredibly remarkable power conversion *** hybrid perovskite photovoltaics promise emerging applications in a myriad of optoelectronic and wearable/portable device applications owing to their inherent intriguing physicochemical and photophysical properties which enabled researchers to take forward advanced research in this growing *** perovskite photovoltaics have attracted significant attention owing to their fascinating material properties with combined merits of high efficiency,light-weight,flexibility,semitransparency,compatibility towards roll-to-roll printing,and large-area mass-scale *** perovskite-based solar cells comprise of 4 key components that include a flexible substrate,semi-transparent bottom contact electrode,perovskite(light absorber layer)and charge transport(electron/hole)layers and top(usually metal)*** these components,interfacial layers and contact electrodes play a pivotal role in influencing the overall photovoltaic *** this comprehensive review article,we focus on the current developments and latest progress achieved in perovskite photovoltaics concerning the charge selective transport layers/electrodes toward the fabrication of highly stable,efficient flexible *** a concluding remark,we briefly summarize the highlights of the review article and make recommendations for future outlook and investigation with perspectives on the perovskite-based optoelectronic functional devices that can be potentially utilized in smart wearable and portable devices.

关键词： Perovskite photovoltaics Charge transport layers Contact interface layer Contact electrodes Printable electronics

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Rapid interrogation of special nuclear materials by combining scattering and transmission nuclear resonance fluorescence spectroscopy

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Nuclear Science and Techniques 2021年第8期32卷 67-77页

作者： Hao-Yang Lan Tan Song Jia-Lin Zhang Jian-Liang Zhou Wen Luo school of Nuclear Science and Technology University of South ChinaHengyang 421001China National Exemplary Base for International Sci.&Tech. Collaboration of Nuclear Energy and Nuclear SafetyUniversity of South ChinaHengyang 421001China

The smuggling of special nuclear materials(SNMs)across national borders is becoming a serious threat to nuclear *** paper presents a feasibility study on the rapid interrogation of concealed SNMs by combining scattering and transmission nuclear resonance fluorescence(s NRF and t NRF)*** s NRF spectroscopy,SNMs such as^(235,238)U are excited by a wide-band photon beam of appropriate energy and exhibit unique NRF *** Carlo simulations show that one-dimensional scans can realize isotopic identification of concealed^(235,238)U when the detector array used for interrogation has sufficiently high energy *** simulated isotopic ratio^(235U/238)U is in good agreement with the theoretical value when the SNMs are enclosed in relatively thin *** interrogation is followed by t NRF spectroscopy using a narrow-band photon beam with the goal of obtaining tomographic images of the concealed *** reconstructed image clearly reveals the position of the isotope^(235)U inside an iron *** is shown that the interrogation time of s NRF and t NRF spectroscopy is one order of magnitude lower than that when only t NRF spectroscopy is used and results in a missed-detection rate of 10^(-3).The proposed method can also be applied for isotopic imaging of other SNMs such as^(239,240)Pu and^(237)Np.

关键词： Special nuclear material Nondestructive interrogation Nuclear resonance fluorescence

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Progress and challenges in the fabrication of DPS shells for ICF

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Matter and Radiation at Extremes 2019年第1期4卷 24-31页

作者： Meifang Liu Yawen Huang Sufen Chen Dawei Pan Miao Chen Qiaomei Chu Yiyang Liu Qiang Yin Zhanwen Zhang Research Center of Laser Fusion China Academy of Engineering PhysicsMianyangChina school of Material Science and Engineering Southwest University of Science and TechnologyMianyangChina

To improve the quality of deuterated polystyrene(DPS)shells,the synthesis and purification of DPS as well as the fabrication of DPS shells are *** molecular weight and molecular weight distribution,measured by GPC-MALLS,are about 350 kg mol^(-1) and less than 2.0,*** results of TG and GC-MS indicate that the residual solvent is almost completely *** shells with;300 mm–2500 mmdiameter and;10 mm–100mmwall thickness are successfully prepared by a microfluidic *** monodispersity of the diameter ismuchbetter than that of the wall thickness in a batch *** vacuoles can be suppressed by both reducing hydrophilic residues in DPS and adding some salts into the outer water phase(W2).The defects appearing during the drying process decrease by heat treatment,ethanol exchange,and lowered drying *** results presented in this work not only provide guidelines for the preparation of DPS shells of better quality,but also indicate challenges for the future.

关键词： shells DPS removed

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Fano Effect and Spin-Polarized Transport in a Triple-Quantum-Dot Interferometer Attached to Two Ferromagnetic Leads

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Chinese physics Letters 2020年第12期37卷 74-80页

作者：白继元陈孔发任鹏宇李江华贺泽龙李立 school of Electronic and Information Engineering Yangtze Normal UniversityChongqing 408003China College of materials Science and Engineering Fuzhou UniversityFuzhou 350108China key Lab of In-fiber Integrated Optics of Ministry of Education College of ScienceHarbin Engineering UniversityHarbin 150001China

We report the conductance and average current through a triple-quantum-dot interferometer coupled with two ferromagnetic leads using the nonequilibrium Green’s *** results show that the interference between the resonant process and the non-resonant process leads to the formation of Fano *** Fano resonances can be observed by applying a time-dependent external *** a Zeeman magnetic field is applied,the spin-up electron transport is depressed in a certain range of electron energy levels.A spin-polarized pulse device can be realized by adjusting the spin polarization parameters of ferromagnetic ***,the I–V characteristic curves show that under the influence of Fano resonance,the spin polarization is significantly enhanced by applying a relatively large reverse bias *** results strongly suggest that the spin-polarized pulse device can be potentially applied as a spin-dependent quantum device.

关键词： function. field. resonant

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Enhancing the graphene photocurrent using surface plasmons and a p-n junction

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Light(Science & Applications) 2020年第1期9卷 793-802页

作者： Di Wang Andres E.Llacsahuanga Allcca Ting-Fung Chung Alexander V.Kildishev Yong P.Chen Alexandra Boltasseva Vladimir M.Shalaev school of Electrical and Computer Engineering Purdue UniversityWest LafayetteIN 47907USA Birck nanotechnology Center Purdue UniversityWest LafayetteIN 47907USA Department of physics and Astronomy Purdue UniversityWest LafayetteIN 47907USA Purdue Quantum Science and Engineering Institute(PQSEI) Purdue UniversityWest LafayetteIN 47907USA

The recently proposed concept of graphene photodetectors offers remarkable properties such as unprecedented compactness,ultrabroadband detection,and an ultrafast response ***,owing to the low optical absorption of pristine monolayer graphene,the intrinsically low responsivity of graphene photodetectors significantly hinders the development of practical *** address this issue,numerous efforts have thus far been made to enhance the light–graphene interaction using plasmonic *** approaches,however,can be significantly advanced by leveraging the other critical aspect of graphene photoresponsivity enhancement-electrical junction *** has been reported that the dominant photocarrier generation mechanism in graphene is the photothermoelectric(PTE)***,the two energy conversion mechanisms involved in the graphene photodetection process are light-to-heat and heat-to-electricity *** this work,we propose a meticulously designed device architecture to simultaneously enhance the two conversion ***,a gap plasmon structure is used to absorb a major portion of the incident light to induce localized heating,and a pair of split gates is used to produce a p-n junction in graphene to augment the PTE current *** gap plasmon structure and the split gates are designed to share common key components so that the proposed device architecture concurrently realizes both optical and electrical *** experimentally demonstrate the dominance of the PTE effect in graphene photocurrent generation and observe a 25-fold increase in the generated photocurrent compared to the un-enhanced *** further photocurrent enhancement can be achieved by applying a DC bias,the proposed device concept shows vast potential for practical applications.

关键词： electrical plasmon hinder

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Recent theoretical progress in the development of perovskite photovoltaic materials

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Journal of energy Chemistry 2018年第3期27卷 637-649页

作者： Xin Zhou Joanna Jankowska Hao Dong Oleg V.Prezhdo College of Environment and Chemical Engineering Dalian University.Dalian 116622.LiaoningChina Department of Chemistry University of Southern CaliforniaLos Angeles 90089California.United States Institute of physics.Polish Academy of Sciences Warsaw 02-668.Poland school of Chemistry and Chemical Engineering Liaoning Normal UniversityDalian 116029LiaoningChina

Since the seminal work by Kojima et al. in 2009, solar cells based on hybrid organic-inorganic perovskites have attracted considerable attention and experienced an exponential growth, with photovoltaic efficiencies as of today reaching above 22%. Despite such an impressive development, some key scientific issues of these materials, including the presence of toxic lead, the poor long-term device stability under heat and humidity conditions, and the anomalous hysteresis of the current-voltage curves shown by various solar cell devices, still remain unsolved and constitute an important focus of experimental and theoretical researchers throughout the world. Density functional theory calculations have been successfully applied to exploring structural and electronic properties of semiconductors, complementing the experimental results in search and discovery of novel functional materials. In this review, we summarize the current progress in perovskite photovoltaic materials from a theoretical perspective. We discuss design of lead-free perovskite materials, humidity-induced degradation mechanisms and possible origins for the observed solar cell hysteresis, and assess future research directions for advanced perovskite solar cells based on computational materials design and theoretical understanding of intrinsic properties.

关键词： Solar cells Perovskite materials Density functional theory

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Recent progress on ambipolar 2D semiconductors in emergent reconfigurable electronics and optoelectronics

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Chinese physics B 2023年第12期32卷 21-39页

作者：赵月豪孙浩然盛喆张卫周鹏张增星 school of microelectronics Fudan UniversityShanghai 200433China National Integrated Circuit Innovation Center Shanghai 201203China school of Information Science and Technology Hangzhou Normal UniversityHangzhou 311121China

In these days,the increasing massive data are being produced and demanded to be processed with the rapid growth of information *** is difficult to rely solely on the shrinking of semiconductor devices and scale-up of the integrated circuits(ICs)again in the foreseeable *** new materials,new-principle semiconductor devices and new computing architectures is becoming an urgent topic in this *** two-dimensional(2D)semiconductors,possessing excellent electrostatic field controllability and flexibly modulated major charge carriers,offer a possibility to construct reconfigurable devices and enable the ICs with new functions,showing great potential in computing capacity,energy efficiency,time delay and *** review focuses on the recent significant advancements in reconfigurable electronic and optoelectronic devices of ambipolar 2D semiconductors,and demonstrates their potential approach towards ICs,like reconfigurable circuits and neuromorphic *** is expected to help readers understand the device design principle of ambipolar 2D semiconductors,and push forward exploring more new-principle devices and new-architecture computing circuits,and even their product applications.

关键词： two-dimensional material ambipolar semiconductor semiconductor device

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Light energy conversion device for photocatalyst 2.0%WO_3-TiO_2 with oxygen vacancies for water splitting

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Journal of Central South University 2010年第5期17卷 943-946页

作者：童海霞陈启元胡慧萍尹周澜 Institute of Chemical and Biologic Engineering Changsha University of Science and Technology school of Chemistry and Chemical Engineering Central South University

Using carbon felt,polytetrafluoroethylene latex and powder catalyst to assembly a light energy conversion device,the photocatalytic activity of catalyst 2.0%WO3-TiO2(2%WO3 compounding TiO2) with oxygen vacancies was studied through the water splitting for O2 evolution,using a high pressure mercury lamp as the light source and Fe 3+ as the electron acceptor in two different devices:an ordinary photolysis device with catalyst powder suspending through a magnetic stirrer and a self-assembly light energy conversion *** results show that after 12 h irradiation,the photocatalytic activity of 2.0%WO3-TiO2 with oxygen vacancies in the self-assembly light energy conversion device is higher than that of the ordinary photolysis device,and the amount of oxygen evolution is about 12 and 9 mmol/L respectively in these two *** 12 h,the rates of O2 evolution are slow in each device and the photocatalyst almost loses the photoactivity in the ordinary photolysis ***,compared with the ordinary photocatalytic device,the rate of oxygen evolution and the life time of the catalyst are improved in the self-assembly light energy conversion device.

关键词：能量转换装置二氧化钛三氧化钨分解水氧空位光触媒光能光催化活性

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