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Nanowire-based transparent conductors for flexible electronics and optoelectronics

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Science Bulletin 2017年第2期62卷 143-156页

作者： Jie Xue jizhong song Yuhui Dong Leimeng Xu Jianhai Li Haibo Zeng Institute of Optoelectronics & Nanomaterials Herbert Cleiter Institute of Nanoscience School of Materials Science and Engineering Nanjing University of Science & Technology Nanjing 210094 China

As the necessary components for various modern electronic and optoelectronic devices, novel transparent electrodes(TEs) with the low cost, abundance features, and comparable performance of indium tin oxide(ITO) are inquired materials. Metal nanowires(NWs) with the excellent photoelectric properties as next-generation TE candidates have widely applications in smart optoelectronic devices such as electronic skins, wearable electronics, robotic skins, flexible and stretchable displays. This review describes the synthetic strategies for the preparation of metal NWs, the assemble process for metal NW films,and the practical aspects of metal NW films with the desired properties in various low-cost, flexible,and solution-based photoelectric devices.

关键词： Metal nanowires Transparent electrodes Solution-based process Light-emitting diodes Touch screens Solar cells

Perovskite nanocrystals:synthesis,properties and applications

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Science Bulletin 2017年第5期62卷 369-380页

作者： Pengfei Fu Qingsong Shan Yuequn Shang jizhong song Haibo Zeng Zhijun Ning Jinkang Gong Shanghai Institute of Ceramics Chinese Academy of SciencesShanghai 200050China University of Chinese Academy of Sciences Beijing 100049China School of Physical Science and Technology Shanghai Tech UniversityShanghai 201210China Institute of Optoelectronics & Nanomaterials Jiangsu Key Laboratory of Advanced Micro & Nano Materials and TechnologyCollege of Material Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China

Halide perovskites have emerged as superstar materials for optoelectronic devices. Besides the fever of research in solar cells, these materials show great promise on light emitting diodes(LEDs), photodetectors and lasers as well. Rapid advances in bulk perovskite materials aroused universal interest for the development of perovskite nanocrystals, inspired by the great progress of classic colloidal semiconductor quantum dots. Perovskite nanocrystals have been synthesized based on solution process and exhibited high luminescence quantum yield, sharp emission peak, and emission color tunability. Significant progresses have been made about the application of perovskite nanocrystals for LED and lasers in recent years. In this paper, we will comprehensively introduce the synthesis strategies, physical and chemical characteristics, as well as their applications in optoelectronic devices.

关键词： Halide perovskite Nanocrystals Light emitting diode Laser

Recent advances and prospects toward blue perovskite materials and light-emitting diodes

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InfoMat 2019年第2期1卷 211-233页

作者： Tao Fang Fengjuan Zhang Shichen Yuan Haibo Zeng jizhong song School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjingChina MIIT Key Laboratory of Advanced Display Materials and Devices Institute of Optoelectronics and NanomaterialsNanjingChina

Perovskite based light-emitting diodes(PeLEDs)have become a powerful candidate for next-generation solid-state lightings and high-definition displays due to their high photoluminescence quantum yield(PLQY),tunable emission wavelength over the visible spectrum,and narrow emission *** the past few years,the development of red-and green-emissive PeLEDs has rapidly increased,and the corresponding external quantum efficiencies(EQE)have exceeded 20%.However,the research progress of blue-emitting PeLEDs is limited by its poor material quality and inappropriate device ***,the maximum EQE of blue PeLED is only 6.2%,which is far from the industrialization *** order to promote the development of blue PeLEDs,we summarize the recent research progress of blue perovskite materials and LEDs and discuss several fatal challenges,mainly embodied in low efficiency and poor *** order to overcome these challenges,detailed analysis and strategies are put forward in terms of the materials and *** the former,we summarize the feasible strategy for the preparation of efficient and stable blue-emissive perovskites using component *** the latter,we analyze the advantages and limitations of the different strategies for blue-emissive perovskite in *** the end of the review,a comprehensive outlook is detailed,including future development directions and several technical problems to be ***,we aim to highlight the significance and promote the industrialization of PeLEDs.

关键词： blue emission component engineering efficiency light-emitting diodes perovskites stability

Calcined Mg-AI Layered Double Hydroxide as a Heterogeneous Catalyst for the Synthesis of Urea Derivatives from Amines and CO2

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Chinese Journal of Chemistry 2013年第3期31卷 381-387页

作者： Ran Zhang Li Hua Li Guo Baoning song jizhong Chen Zhenshan Hou Key Laboratory for Advanced Materials Research Institute of Industrial Catalysis East China University of Science and Technology Shanghai 200237 China

The calcined Mg-A1 layered double hydroxides （LDHs） with a Mg/A1 molar ratio of 3 ： 1 were synthesized and characterized thoroughly by X-ray diffraction （XRD）, temperature-programmed desorption （TPD） of CO2, and thermogravimetric analysis （TGA）. Thus the calcined Mg-A1 LDHs were used as catalyst for the catalytic synthesis of disubstituted ureas from amines and CO2. The effects of reaction time, reaction temperature, pressure, solvent and calcined temperature on activity have been investigated. The results indicated that aliphatic amines, cyclo- hexylamine and benzylamine can be converted to the corresponding ureas selectively over the calcined Mg-A1 LDHs catalysts with N-methyl-2-pyrrolidone （NMP） as solvent without using any dehydrating regent. The catalyst can be recycled several times with only slight loss of activity.

关键词： carbon dioxide 1,3-disubstituted urea hydrotalcites layered double hydroxide heterogeneous cataly-sis

Finely regulated luminescent Ag-In-Ga-S quantum dots with green-red dual emission toward white light-emitting diodes

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Opto-Electronic Advances 2024年第9期7卷 54-63页

作者： Zhi Wu Leimeng Xu Jindi Wang jizhong song Key Laboratory of Materials Physics of Ministry of Education Laboratory of Zhongyuan LightSchool of PhysicsZhengzhou UniversityDaxue Road 75Zhengzhou 450052China

Ag-In-Ga-S(AIGS)quantum dots(QDs)have recently attracted great interests due to the outstanding optical properties and eco-friendly components,which are considered as an alternative replacement for toxic Pb-and Cd-based ***,enormous attention has been paid to how to narrow their broadband spectra,ignoring the application advantages of the broadband *** this work,the AIGS QDs with controllable broad green-red dual-emission are first reported,which is achieved through adjusting the size distribution of QDs by controlling the nucleation and growth of AIGS ***,the AIGS QDs exhibit broad dual-emission at green-and red-band evidenced by photoluminescence(PL)spectra,and the PL relative intensity and peak position can be finely ***,the dual-emission is the intrinsic characteristics from the difference in confinement effect of large particles and tiny particles confirmed by temperature-dependent PL ***,the AIGS QDs(the size consists of 17 nm and 3.7 nm)with 530 nm and 630 nm emission could successfully be synthesized at 220°*** combining the blue light-emitting diode(LED)chips and dual-emission AIGS QDs,the constructed white light-emitting devices(WLEDs)exhibit a continuous and broad spectrum like natural sunlight with the Commission Internationale de l’Eclairage(CIE)chromaticity coordinates of(0.33,0.31),a correlated color temperature(CCT)of 5425 K,color rendering index(CRI)of 90,and luminous efficacy of radiation(LER)of 129 lm/W,which indicates that the AIGS QDs have huge potential for lighting applications.

关键词： quantum dots Ag-In-Ga-S dual emission white light-emitting diodes

Giant efficiency and color purity enhancement in multicolor inorganic perovskite light-emitting diodes via heating-assisted vacuum deposition

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Journal of Semiconductors 2020年第5期41卷 91-98页

作者： Boning Han Qingsong Shan Fengjuan Zhang jizhong song Haibo Zeng School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China MIIT Key Laboratory of Advanced Display Materials and Devices Institute of Optoelectronics&NanomaterialsNanjing 210094China School of Physics and Engineering Zhengzhou UniversityZhengzhou 450052China

Inorganic perovskites(Cs Pb X3(X=I,Br,Cl))have broad prospection in the field of high-definition displaying due to its excellent optoelectronic *** vacuum deposition process possesses advantages and competitiveness in the industrialized ***,the performance of light emitting diodes(LEDs)based on vacuum-deposited is incredibly ***,we proposed a heating-assisted vacuum deposition(HAVD)method to construct inorganic perovskite LEDs(Pe LEDs)with enhanced *** roughness and crystallinity of perovskite film were improved by regulating the heating treatment of *** the perovskite film exhibited largely rise in luminescence,with decreasing defect ***,with the optimized temperature,the green Pe LEDs exhibited 100-fold improvement of external quantum efficiency(EQE)with the luminance of up to 11941 cd/m2,and the full width at half-maximum(FWHM)of the electroluminescence(EL)spectra was decreased from 25 to 17 *** the same time,the red and blue Pe LEDs also exhibited obvious enhancement in EQE and luminance by HAVD method,and both the FWHM of EL spectra dropped below 20 nm,exhibiting excellent high color *** strategy has a huge potential to be a new commonly used method for low-cost fabrication of displays and lighting.

关键词： all-inorganic perovskites light-emitting diodes heating assisted vacuum deposition Cs Pb Br3 color purity

Highly spectra-stable pure blue perovskite light-emitting diodes based on copper and potassium co-doped quantum dots

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Nano Research 2023年第5期16卷 7654-7660页

作者： Fang Chen Wenjie Ming Yongfei Li Yun Gao Lea Pasquale Kexin Yao Boyuan Huang Qiuting Cai Guochao Lu jizhong song Mirko Prato Xingliang Dai Haiping He Zhizhen Ye School of Materials Science and Engineering State Key Laboratory of Silicon MaterialsZhejiang UniversityHangzhou 310027China Wenzhou Key Laboratory of Novel Optoelectronic and Nano Materials Institute of WenzhouZhejiang UniversityWenzhou 325006China Wenzhou XINXINTAIJING Tech.Co.Ltd. Wenzhou 325006China Shanxi‐Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030000China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Multi-scale Porous Materials Center Institute of Advanced Interdisciplinary Studies&School of Chemistry and Chemical EngineeringChongqing UniversityChongqing 400044China Materials Characterization Facility Istituto Italiano di TecnologiaGenova 16163Italy School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450052China

Halide perovskite light emitting diodes(LEDs)have gained great progress in recent ***,mixed-halide perovskites for blue LEDs usually suffer from electroluminescence(EL)spectra shift at a high applied voltage or current density,limiting their *** this work,we report a strategy of using single-layer perovskite quantum dots(QDs)film to tackle the electroluminescence spectra shift in pure-blue perovskite LEDs and improve the LED efficiency by co-doping copper and potassium in the mixed-halide perovskite *** a result,we obtained pure-blue halide perovskite QD-LEDs with stable EL spectra centred at 469 nm even at a current density of 1,617 mA·cm^(−2).The optimal device presents a maximum external quantum efficiency(EQE)of 2.0%.The average maximum EQE and luminance of the LEDs are 1.49%and 393 cd·m^(−2),increasing 62%and 66%compared with the control *** study provides an effective strategy for achieving spectra-stable and highly efficient pure-blue perovskite LEDs.

关键词： light-emitting diode blue LED perovskite quantum dot stable electroluminescence spectra metal doping

Perovskite light-emitting/detecting bifunctional fibres for wearable LiFi communication

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Light(Science & Applications) 2020年第1期9卷 441-449页

作者： Qingsong Shan Changting Wei Yan Jiang jizhong song Yousheng Zou Leimeng Xu Tao Fang Tiantian Wang Yuhui Dong Jiaxin Liu Boning Han Fengjuan Zhang Jiawei Chen Yongjin Wang Haibo Zeng MIIT Key Laboratory of Advanced Display Materials and Devices Institute of Optoelectronics&NanomaterialsSchool of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China Peter Grünberg Research Center Laboratory of Broadband Wireless Communication and Sensor Network TechnologyMinistry of EducationNanjing University of Posts and TelecommunicationsNanjing 210003China

Light fidelity(LiFi),which is emerging as a compelling technology paradigm shifting the common means of highcapacity wireless communication technologies,requires wearable and full-duplex compact design because of its great significance in smart wearables as well as the‘Internet of Things’.However,the construction of the key component of wearable full-duplex LiFi,light-emitting/detecting bifunctional fibres,is still challenging because of the conflicting process between carrier separation and recombination,as well as the highly dynamic film-forming ***,we demonstrate light-emitting/detecting bifunctional fibres enabled by perovskite QDs with hybrid *** hybrid perovskite inks endow fibres with super-smooth QD ***,combined with the small exciton binding energy and high carrier mobility of perovskite QDs,enables successful integration of electroluminescence and photodetection into *** bifunctional fibres possess the narrowest electroluminescence full width at half maximum of ~19 nm and,more importantly,the capability for simultaneously transmitting and receiving *** successful fabrication of narrow emission full-duplex LiFi fibres paves the way for the fabrication and integration of low crosstalk interoperable smart wearables.

关键词： process perovskite functional

Perovskite QLED with an external quantum efficiency of over 21%by modulating electronic transport

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Science Bulletin 2021年第1期66卷 36-43,M0003页

作者： Tao Fang Tiantian Wang Xiansheng Li Yuhui Dong Sai Bai jizhong song School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China MIIT Key Laboratory of Advanced Display Materials and Devices Institute of Optoelectronics&NanomaterialsNanjing 210094China Department of Physics Chemistry and Biology(IFM)Linköping UniversityLinköping 58183Sweden

Perovskite quantum-dot-based light-emitting diodes(QLEDs)are highly promising for future solid-state lightings and high-definition displays due to their excellent color ***,their device performance is easily affected by charge accumulation induced luminescence quenching due to imbalanced charge injection in the *** we report green perovskite QLEDs with simultaneously improved efficiency and operational lifetime through balancing the charge injection with the employment of a bilayered electron transport *** charge-balanced QLEDs exhibit a color-saturated green emission with a full-width at half-maximum(FWHM)of 18 nm and a peak at 520 nm,a low turn-on voltage of2.0 V and a champion external quantum efficiency(EQE)of 21.63%,representing one of the most efficient perovskite QLEDs so *** addition,the devices with modulated charge balance demonstrate a nearly 20-fold improvement in the operational lifetime compared to the control *** results demonstrate the great potential of further improving the device performance of perovskite QLEDs toward practical applications in lightings and displays via rational device engineering.

关键词： Light-emitting diodes Perovskite Quantum dots Charge balance Electron transport