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colloidal quantum-dots surface and device structure engineering for high-performance light-emitting diodes

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National Science Review 2017年第2期4卷 170-183页

作者： Yuequn Shang Zhijun Ning School of Physical Science and Technology Shanghai Tech University Shanghai Institute of Ceramics Chinese Academy of Sciences University of Chinese Academy of Sciences

The application of colloidal quantum dots for light-emitting devices has attracted considerable attention in recent years, due to their unique optical properties such as size-dependent emission wavelength, sharp emission peak and high luminescent quantum yield. Tremendous efforts have been made to explore quantum dots for light-emission applications such as light-emitting diodes(LEDs) and light *** performance of quantum-dots-based light-emitting diodes(QD-LEDs) has been increasing rapidly in recent decades as the development of quantum-dots synthesis, surface-ligand engineering and device-architecture optimization. Recently, the external quantum efficiencies of red quantum-dots LEDs have exceeded 20.5% with good stability and narrow emission peak. In this review, we summarize the recent advances in QD-LEDs, focusing on quantum-dot surface engineering and device-architecture optimization.

关键词： colloidal quantum dots light-emitting diodes surface engineering device architecture

colloidal perovskite quantum dots for record-efficiency and phase stable solar cell

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Colloidal perovskite quantum dots for record-efficiency and ...

Photostability of colloidal single photon emitter in near-infrared regime at room temperature

第七届新型太阳能电池材料科学与技术学术研讨会

作者：郝萌萌白杨王连洲 Nanomaterials Centre School of Chemical Engineering and Australian Institute of Biotechnology and NanotechnologyThe University of Queensland

Solution processed halide perovskite quantum dots(PQDs) are in great potential as materials for efficient light emitting and solar cell technologies,which is attribute to their unique optoelectronic properties and facile fabricating route for large scale and flexible ***,PQDs obtained from reported synthesis approaches have abundant defects that are detrimental to charge transport,which curtails the power conversion efficiency(PCE) of QD solar cells(QDSCs).We demonstrate a ligand management strategy to synthesis PQDs with significant reduction of defect density and improved phase *** hero QDSC achieves a certified record PCE of 16.6% with negligible hysteresis,surpassing the previous record efficiency of 13.4%. We further demonstrate that the QD devices exhibit substantially enhanced operational stability,retaining 94% of the original PCE under 1-sun continuous illumination for 600 hours at *** anticipate that the colloidal PQDs will offer a new avenue for high-performance flexible devices,tandem solar cells,photocatalysis and a range of optoelectronics.

关键词： colloidal quantum dots Ligand management Solar cell

来源： cnki会议评论

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Chinese Physics B 2024年第3期33卷 515-520页

作者：靳思玥许兴胜 Key Laboratory of Optoelectronic Materials and Devices Chinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Hefei National Laboratory Hefei 230088China

The photostability of a colloidal single photon emitter in near-infrared regime at room temperature is *** fluorescence lifetime,blinking phenomenon,and anti-bunching effect of a single CdTeSe/ZnS quantum dot with an emission wavelength of 800 nm at room temperature are *** second-order correlation function at zero delay time is much smaller than 0.1,which proves that the emission from single quantum dots at 800 nm is a highly pure single-photon *** effects of the irradiation duration on the fluorescence from single quantum dots are *** experimental results can be explained by a recombination model including a multi-nonradiative recombination center model and a multi-charged model.

关键词： colloidal quantum dots single photon source blinking

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Double-ended passivator enables dark-current-suppressed colloidal quantum dot photodiodes for CMOS-integrated infrared imagers

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InfoMat 2024年第1期6卷 108-122页

作者： Peilin Liu Shuaicheng Lu Jing Liu Bing Xia Gaoyuan Yang Mo Ke Xuezhi Zhao Junrui Yang Yuxuan Liu Ciyu Ge Guijie Liang Wei Chen Xinzheng Lan Jianbing Zhang Liang Gao Jiang Tang Wuhan National Laboratory for Optoelectronics(WNLO)and School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhanthe People's Republic of China Wenzhou Advanced Manufacturing Technology Institute Huazhong University of Science and TechnologyWenzhouthe People's Republic of China School of Physics and Electronic Engineering Hubei University of Arts and ScienceXiangyangthe People's Republic of China School of Integrated Circuits Huazhong University of Science and TechnologyWuhanthe People's Republic of China School of Engineering Physics Shenzhen Technology UniversityShenzhenthe People's Republic of China Optics Valley Laboratory Wuhanthe People's Republic of China Shenzhen Huazhong University of Science and Technology Research Institute Shenzhenthe People's Republic of China

Lead sulfide(PbS)colloidal quantum dot(CQD)photodiodes integrated with silicon-based readout integrated circuits(ROICs)offer a promising solution for the next-generation short-wave infrared(SWIR)imaging *** their potential,large-size CQD photodiodes pose a challenge due to high dark currents resulting from surface states on nonpassivated(100)facets and trap states generated by CQD *** this work,we present a novel approach to address this issue by introducing double-ended ligands that supplementally passivate(100)facets of halidecapped large-size CQDs,leading to suppressed bandtail states and reduced defect *** results demonstrate that the dark current density is highly suppressed by about an order of magnitude to 9.6 nA cm^(2) at -10 mV,which is among the lowest reported for PbS CQD ***,the performance of the photodiodes is exemplary,yielding an external quantum efficiency of 50.8%(which corresponds to a responsivity of 0.532 A W^(-1))and a specific detectivity of 2.5×10^(12) Jones at 1300 *** integrating CQD photodiodes with CMOS ROICs,the CQD imager provides high-resolution(640×512)SWIR imaging for infrared penetration and material discrimination.

关键词： CMOS integration colloidal quantum dots dark current suppression double-ended passivation infrared imager

Significant Lifetime Enhancement in QLEDs by Reducing Interfacial Charge Accumulation via Fluorine Incorporation in the ZnO Electron Transport Layer

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Nano-Micro Letters 2022年第12期14卷 432-446页

作者： Dong Seob Chung Tyler Davidson-Hall Giovanni Cotella Quan Lyu Peter Chun Hany Aziz Department of Electrical and Computer Engineering Waterloo Institute for NanotechnologyUniversity of Waterloo200 University Avenue WestWaterlooON N2L 3G1Canada Ipswich Research Centre Huawei Technologies Research&Development(UK)Ltd.Phoenix House(B55)Adastral ParkIpswich IP53REUK Ottawa IC Laboratory Huawei Canada19 Allstate ParkwayMarkhamON L3R 5B4Canada

ZnO nanoparticles are widely used for the electron transport layers(ETLs)of quantum dots light emitting devices(QLEDs).In this work we show that incorporating fluorine(F)into the ZnO ETL results in significant enhancement in device electroluminescence stability,leading to LT50 at 100 cd m^(−2) of 2,370,000 h in red QLED,47X longer than the control devices.X-ray photo-electron spectroscopy,time-of-flight secondary ion mass spectroscopy,photoluminescence and electrical measurements show that the F passivates oxygen vacancies and reduces electron traps in *** photoluminescence versus bias measurements and capacitance-voltage-luminance measurements reveal that the CF4 plasma-treated ETLs lead to increased electron concentration in the QD and the QD/hole transport layer interface,subsequently decreasing hole accumulation,and hence the higher *** findings provide new insights into the critical roles that optimizing charge distribution across the layers play in influencing stability and present a novel and simple approach for extending QLED lifetimes.

关键词： colloidal quantum dots quantum dots light emitting device Device stability Zinc oxide nanoparticles Fluorine

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Strong circularly polarized luminescence from quantum dots/2D chiral perovskites composites

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Nano Research 2023年第5期16卷 7593-7599页

作者： Qingqian Wang Hongmei Zhu Wei Chen Junjie Hao Zhaojin Wang Jun Tang Yingguo Yang Xiao Wei Sun Dan Wu Kai Wang Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen 518055China College of Engineering Physics Shenzhen Technology UniversityShenzhen 518118China College of New Materials and New Energies Shenzhen Technology UniversityShenzhen 518118China Shanghai Advanced Research Institute Chinese Academy of ScienceShanghai 201210China

Chiral perovskites(CPs)have attracted enormous attentions since they have combined chirality and optoelectrical properties well which is promising in circularly polarized luminescence(CPL)application and of great importance for future ***,there is a key contradiction that in chiral perovskites chirality distorts the crystal structure,leading to poor photoluminescence(PL)*** the balance between chirality and PL is a major challenge for strong CPL from chiral ***,two-dimensional(2D)chiral perovskite has shown fascinating chiral induced spin selectivity(CISS)effect which can act as spin injector under ambient ***,we propose an effective strategy to achieve high CPL activity generated from quantum dots(QDs)by introducing 2D chiral perovskite as a chiral source,providing spin polarized carriers through the CISS *** as-synthesized QDs/CP composites exhibit dissymmetry factors(glum)up to 9.06×10^(−3).For the first time,we performed grazing incident wide angle X-ray scattering(GIWAXS)measurements,showing the chirality originates from the distorted lattices caused by the large chiral organic ***,time-resolved PL(TR-PL)measurements verify the enhanced CPL activity should be attributed to the charge transport between two *** findings provide a useful method to achieve CPL in QDs/2D chiral perovskite heterojunctions which could be promising in spinoptoelectronics application.

关键词： circularly polarized luminescence colloidal quantum dots two-dimensional(2D)chiral perovskites grazing incident wide angle X-ray scattering(GIWAXS) chiral induced spin selectivity

用于PPG信号测试的大面积柔性胶体量子点红外光电二极管

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Science Bulletin 2023年第7期68卷 698-705页

作者：梁心怡刘宇轩刘沛林杨骏睿刘婧杨扬汪波胡军张琳祥杨高元鲁帅成梁桂杰蓝新正张建兵高亮唐江 Wuhan National Laboratory for Optoelectronics(WNLO)and School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Optics Valley Laboratory Wuhan 430074China Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and ScienceXiangyang 441053China Wenzhou Advanced Manufacturing Technology Research Institute of Huazhong University of Science and Technology Wenzhou 325006China Shenzhen Huazhong University of Science and Technology Research Institute Shenzhen 518000China

以铟镓砷、碲镉汞等外延生长的单晶材料作为吸光层的光电二极管是红外探测技术的主流方案.然而,它们的刚性结构、极高成本以及有限尺寸使其无法满足诸如人体内外环境监测,便携式医疗等智能穿戴应用的需求.基于低温液相工艺的胶体量子点(... 详细信息

以铟镓砷、碲镉汞等外延生长的单晶材料作为吸光层的光电二极管是红外探测技术的主流方案.然而,它们的刚性结构、极高成本以及有限尺寸使其无法满足诸如人体内外环境监测,便携式医疗等智能穿戴应用的需求.基于低温液相工艺的胶体量子点(CQDs)红外光电二极管是实现大面积柔性红外光电探测器极具竞争力的候选方案,但由于其发展年限较短,仍存在暗电流密度大、均匀性差以及工作稳定性差等问题.本文通过在CQDs墨水中引入聚酰亚胺来制备CQDs光电二极管.这种聚合物配体既实现了对CQDs表面缺陷态的钝化,又能够保持胶体墨水的单分散性和持久性.这两点使得光电探测器的吸光层形貌得以改善,同时暗电流密度显著降低,极大地优化了CQDs光电二极管的均匀性和工作稳定性.采用该方案制备的大面积柔性CQDs光电二极管能够实现高于10^(13)Jones的比探测率,可在环境光下实现可穿戴式光电体积描记(PPG)心率信号监测,极大地降低了成本和功耗.

关键词： colloidal quantum dots Large-area Flexible Infrared photodiode Photoplethysmogram

Ligand engineering of colloid quantum dots and their application in all-inorganic tandem solar cells

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Journal of Energy Chemistry 2020年第11期29卷 230-239页

作者： Fen Qiao Yi Xie Zhankun Weng Huaqiang Chu School of Energy&Power Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070HubeiChina Ministry of Education Key Laboratory for Cross-Scale Micro and Nano Manufacturing Changchun University of Science and TechnologyChangchun 130022JilinChina International Research Centre for Nano Handling and Manufacturing of China Changchun University of Science and TechnologyChangchun 130022JilinChina School of Energy and Environment Anhui University of Technology.Ma'an-shan 243002.AnhuiChina

How to effectively utilize the energy of the broad spectrum of sunlight is one of the basic problems in the research of tandem solar cells. Due to their size effect, quantum confinement effect and coupling effect, colloidal quantum dots(QDs) exhibit new physical properties that bulk materials don’t ***(X = Se, S, etc.) and Pb X(X = Se, S, etc.) QDs prepared by hot-injection methods have been widely studied in the areas of photovolitaic devices. However, the surfactants surrounding QDs seriously hinder the charge transport of QDs based solar cells. Therefore, how to fabricate high-performance tandem solar cells via ligands engineering has become a major challenge. In this paper, the latest progress of colloidal QDs in the research of all-inorganic tandem solar cells was summarized. Firstly, the improvement of QDs surface ligands and the optimization of ligands engineering were discussed, and the control of the physical properties of QDs films were realized. From the aspects of colloidal QDs, ligand engineering, and solar cell preparation, the future development direction of colloidal QDs solar cells was proposed, providing technical guidances for the preparation of low-cost and high-efficiency nanocrystalline solar cells.

关键词： Hot-injection method colloidal quantum dots Ligand engineering Tandem solar cell

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Device performance and light characteristics stability of quantum-dot-based white-light-emitting diodes

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Nano Research 2018年第3期11卷 1575-1588页

作者： Bruno Clasen Hames Ivan Mora-Sero Rafael S. Sanchez Institute of Advanced Materials (INAM) Universitat Jaume 1 12071 Castello Spain

Advances in image quality in recent decades have made it necessary to develop new technologies for producing displays to meet remarkably stricter standards. The display market is governed mainly by liquid crystal display and light-emitting diode （LED） technology; however, it suffers from limitations that can be overcome by developing the next generation of electroluminescent displays. The introduction of colloidal quantum dots （QDs） as down-converters has enabled the production of displays with extremely high color purity and gamut. Therefore, colloidal nanocrystals are excellent candidates for the preparation of electroluminescent devices, which represent a straightforward approach to the development of unprecedented high-quality displays. We synthesized light-emitting QDs covering the entire visible spectrum with high fluorescence quantum yields and color purity, and produced high-brightness single-color LEDs with external quantum efficiencies of 0.39%, 1.04%, 2.10%, and 1.30% for red-, orange-, green-, and blue-emitting dots, respectively. Additional136 white LEDs were prepared by mixing QDs; they showed color temperatures of 5,300 K and color rendering indices exceeding 80%. Very importantly, we exhaustively characterized the LED performance, including the response time, stability, and evolution of the light characteristics, thus providing crucial information toward the development of high-quality electroluminescent displays.

关键词： colloidal quantum dots quantum dotlight-emitting diodes white light-emitting diode(LED) displays electroluminescence LED stability