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A record-breaking low turn-on voltage blue QLED via reducing built-in potential

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Nano Research 2024年第12期17卷 10446-10452页

作者： Run Wang hengyang xiang Chi Zhang Hongyang Li Yuqin Su Qi Chen Qinye Bao Gaoran Li Haibo Zeng MIIT Key Laboratory of Advanced Display Materials and Devices Institute of Optoelectronics and NanomaterialsCollege of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China i-Lab CAS Center for Excellence in NanoscienceSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China School of Physics and Electronic Science East China Normal University Shanghai 200241China

Developing light-emitting diodes(LEDs)with the merits of low driving and high brightness has always been *** the carrier dynamic process under electroexcitation,the built-in potential(V_(bi))represents the moment that the photons start to be produced in a ***,it has not been carefully studied and ***,we observed that by employing an interface regulation strategy to enhance hole concentration,the V_(bi)of quantum dot LEDs(QLEDs)can be *** with the characterization methods of Mott–Schottky(MS)and scanning Kelvin probe microscopy(SKPM),the key indicator of V_(bi)on driving voltage for QLEDs is *** from the reduction of V_(bi),a record-breaking ultra-low turn-on voltage of 2.2 V(@1 cd/m^(2))is achieved in a blue *** blue QLED shows an advantage of high brightness under low driving voltages,i.e.,1000 cd/m^(2)@3.10 V and 5000 cd/m^(2)@3.88 *** work proposes a reference strategy to predict and analyze the driving voltage issue,which is beneficial to facilitating the development of low-driving QLEDs in the future.

关键词： built-in potential low turn-on voltage high brightness quantum dot light-emitting diodes(QLEDs)

White light-emitting diodes from perovskites

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Journal of Semiconductors 2021年第3期42卷 4-6页

作者： hengyang xiang Chuantian Zuo Haibo Zeng Liming Ding MIIT Key Laboratory of Advanced Display Materials and Devices Institute of Optoelectronics&NanomaterialsSchool of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China

White light-emitting diodes(WLEDs),as key infrastructure,play an important role in the field of lighting and *** the past few decades,many methods were developed to prepare WLEDs.A common strategy is to use blue LEDs to excite yttrium aluminum garnet(YAG)phosphors and generate composite white light,which is now the main technology for commercial *** 2014,Nobel Prize in Physics was awarded to Nakamura et *** their contribution to blue LEDs[1,2].

关键词： diodes WLED emitting

Multi-site anchoring lead-halide octahedral by benzylphosphonic acid to regulate phase distribution for efficient PeLEDs

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Nano Research 2024年第11期17卷 10034-10041页

作者： Jiahao Tang Yifei Wang hengyang xiang Run Wang Kun Zhang Xinyi Lv Xinrui Chen Ziqing Xu Zhesheng Chen Lei Wang Aidi Zhang An Xie Haibo Zeng MIIT Key Laboratory of Advanced Display Materials and Devices Institute of Optoelectronics and Nanomaterials College of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan 430074 China Engineering Research Center of Functional Polymer Membrane Materials of Jiangsu Province Nanjing Bready Advanced Materials Technology Co. Ltd. Nanjing 211103 China School of Materials Science and Engineering Xiamen University of Technology Xiamen 361024 China

Quasi-two-dimensional perovskite light-emitting diodes (quasi-2D PeLEDs) are emerging as high-potential candidates for new generation of wide-color gamut displays due to their simple, low-cost solution process, and high color purity. However, the luminescence performance of quasi-2D perovskite films is severely limited by dispersed phase distribution and excessive defect density, which are caused by excessive diffusion of nucleation sites during the perovskite growth stage. Here, the benzylphosphonic acid (BPA) molecule, owing to its strong P-O-Pb bond energy sites and strong electronegativity to PEA+, can aggregate lead-halide octahedron to grow high-dimensional phases, avoiding scattered low-dimensional phases (n = 1). The continuous gradient phase distribution will be beneficial to smooth carrier injection and effectively suppress the leakage current in PeLEDs. Meanwhile, the introduction of phosphonic acid groups will fill the vacancies of Pb ions and reduce non-radiative recombination. As a result, the maximum external quantum efficiency (EQE) of PeLEDs can be increased from 8% to 20.6% with a 514 nm light emission and a 21 nm full-width half maximum, and the device lifetime (T 50) is nearly 6-fold of the pristine sample. In addition, this strategy is also suitable for other wavelength. For example, in blue light, performance improvement is also realized that the maximum EQE of 8% and the luminance increased from 1045 to 5264 cd/m2. These results provide a feasible strategy to regulate the phase distribution and passivate the defects of quasi-2D perovskites.

关键词： quasi-2D perovskites light-emitting diodes benzylphosphonic acid phase distribution defect passivation

Electron donor–acceptor (D-A) tuning to achieve soluble covalent organic polymers for optoelectronic devices

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eScience 2023年第1期3卷 53-61页

作者： Xueli Li Xianjin Yue Yifei Wang Tengge Chen Yihui Zhou Di Liu hengyang xiang Shengli Zhang Haibo Zeng Zhonghua xiang State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing100029PR China MIIT Key Laboratory of Advanced Display Materials and Devices Institute of Optoelectronics and NanomaterialsSchool of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing210094PR China

Covalent organic polymers(COPs)have emerged as a unique class of luminescent polymers with pre-designed quasi-ordered ***,their layered stacks and limited solubility preclude further processing for large-scale applications in devices,especially optoelectronic ***,a universal strategy to adjust the electron donor–acceptor(D-A)moieties of the building blocks in COPs is proposed,achieved by in situ charge exfoliation of COP blocks into few-layer true solutions in(Lewis)acid and base *** electron D-A moieties of the building blocks endow the COPs with the ability to accept or donate electrons,by altering the electron cloud distribution as well as the relative energy levels of the frontier molecular *** resultant soluble COPs can easily be processed into a uniform film by solution processing via the spin-coat *** obtained COP-N achieves efficient and stable perovskite electroluminescence as a novel hole injection material on indium tin oxide,and the operating lifetime for a perovskite quantum dot light-emitting diodes device exceeds that of a poly(ethylene dioxythiophene):polystyrene sulphonate *** straightforward electronic regulation strategy provides a new avenue for the rational synthesis of processable reticular molecular polymers for practical electronic devices.

关键词： Covalent organic polymers Electron donor-acceptor(D-A)moieties In situ charge exfoliation Solution processing

钙钛矿多色级联发光二极管中多中心载流子均衡分布调控研究

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无机材料学报 2023年第9期38卷 1062-1068,I0003页

作者：王润相恒阳曾海波南京理工大学材料科学与工程学院新型显示材料与器件工信部重点实验室南京210094

钙钛矿发光二极管(PeLEDs)具有优异的光电特性,在显示应用中表现出巨大的发展潜力。红、绿和蓝单色PeLEDs的研究已经取得了突破性的进展,但是三色钙钛矿共同电致发光的研究始终迟滞不前。本研究在不同钙钛矿之间引入具有空穴/电子产生... 详细信息

钙钛矿发光二极管(PeLEDs)具有优异的光电特性,在显示应用中表现出巨大的发展潜力。红、绿和蓝单色PeLEDs的研究已经取得了突破性的进展,但是三色钙钛矿共同电致发光的研究始终迟滞不前。本研究在不同钙钛矿之间引入具有空穴/电子产生和传输能力的中间连接层(ICL),实现了蓝绿双色和红绿蓝三色发光中心共同电致发光。一方面,ICL可以抑制不同钙钛矿之间的离子交换和能量转移;另一方面,ICL具有电荷产生和输运功能,能够确保不同发光中心获得足够的载流子实现独立发光。进一步改变空穴传输层(NPB)的厚度可以调控蓝绿双色发光中心之间的能量均衡分布,当NPB厚度为40 nm时,器件表现出最大外量子效率(External Quantum Efficiency,EQE)为0.33%。红绿蓝钙钛矿共同电致发光器件的最大EQE达到0.5%。本工作首次报道了红绿蓝三色钙钛矿共同电致发光,并为钙钛矿多色发光中心共同电致发光提供了具有参考性的策略,推动了钙钛矿在显示应用中的发展进程。

关键词：钙钛矿发光二极管多色发光中心中间连接层载流子分布调控

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磷化铟量子点及其电致发光研究现状和挑战

发光学报 2024年第2期45卷 231-251页

作者：相恒阳王益飞于鹏张坤赵家龙曾海波南京理工大学材料科学与工程学院新型显示材料与器件工信部重点实验室江苏南京210094 广西大学物理科学与工程技术学院广西南宁530004

量子点作为一种理想的发光材料,一直以来引起了科学家和工业界的广泛关注,推动了生物成像、照明、显示等领域的发展。随着生态环境保护的意识逐渐增强,磷化铟量子点(InP QDs)作为镉基量子点的最好替代者之一,受到了广泛的关注:一方面,In... 详细信息

量子点作为一种理想的发光材料,一直以来引起了科学家和工业界的广泛关注,推动了生物成像、照明、显示等领域的发展。随着生态环境保护的意识逐渐增强,磷化铟量子点(InP QDs)作为镉基量子点的最好替代者之一,受到了广泛的关注:一方面,InP QDs具有与镉基量子点相媲美的发光和光电性质;另一方面,其发光光谱范围可覆盖整个可见光区,且合成工艺与镉基量子点共通。然而,因为InP QDs与传统镉基量子点相比,在元素价态、核壳晶格匹配性、反应动力学过程等方面具有特殊性,其合成化学的发展还不成熟,限制了其光电应用的研究进程。本文结合量子点显示的发展现状和未来需求,针对InP QDs体系进行了综述,通过分析其研究现状,分析其发展问题和挑战,并对其进行了展望,期望为量子点及其电致发光器件的进一步探索研究提供一些启示和帮助,推动无镉、低毒、高色纯度量子点体系的发展。

关键词：量子点磷化铟 QLEDs 高色纯度显示

煤气化装置黑水阀冲蚀磨损机理及智能防控研究

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流体机械 2023年第10期51卷 10-17页

作者：金浩哲陈凤官王超刘骁飞项恒阳浙江理工大学流动腐蚀研究所杭州310018 合肥通用机械研究院有限公司合肥230031

针对煤气化装置黑水阀的冲蚀磨损问题,分析了黑水阀冲蚀磨损失效机理、过程与条件,实现黑水阀的失效预测分析,获得关键部位的损伤速率;采用B/S架构方式搭建黑水闪蒸处理系统的智能防控体系,实现黑水阀流动参数的实时监测。结果表明:黑... 详细信息

针对煤气化装置黑水阀的冲蚀磨损问题,分析了黑水阀冲蚀磨损失效机理、过程与条件,实现黑水阀的失效预测分析,获得关键部位的损伤速率;采用B/S架构方式搭建黑水闪蒸处理系统的智能防控体系,实现黑水阀流动参数的实时监测。结果表明:黑水阀内含固流体在流经节流区域时,固体颗粒以切削等方式高速冲击阀门壁面,导致阀芯以及阀座部位出现较严重损伤,且阀芯部位的冲蚀磨损率较阀座部位高出1个数量级,最高达到2×10^(-6)kg/(m^(2)·s),但其磨损率会随着开度增加而减小。智能防控体系通过实时信号采集、二次信号采集和软测量建模等技术手段,实现装置的运行状态实时监测并提出针对性的工艺防护方案,使黑水闪蒸阀门使用寿命延长91%以上,有利于指导黑水闪蒸处理系统的安全稳定长周期运行,进而为煤气化系统的安全运行提供保障。

关键词：煤气化黑水阀冲蚀磨损数值模拟智能防控

基于表面等离子激元波导透射性能的环形滤波器设计

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光学技术 2014年第4期40卷 295-297,301页

作者：项立张衡阳湛江师范学院广东湛江524048 空军工程大学陕西西安710038

当前对表面等离子体激元(SPP)耦合性能及其传播的研究已成为这一领域急需改进的课题。为了进一步使SPP纳米器件成为可能,利用SPP波导结构设计了一种表面等离子体激元环形滤波器,建立了SPP波导结构传输模型和金属光栅SPP传输模型。透射... 详细信息

当前对表面等离子体激元(SPP)耦合性能及其传播的研究已成为这一领域急需改进的课题。为了进一步使SPP纳米器件成为可能,利用SPP波导结构设计了一种表面等离子体激元环形滤波器,建立了SPP波导结构传输模型和金属光栅SPP传输模型。透射率仿真分析表明,透射率会随着金属薄膜厚度的变化而变化,当金属薄膜厚度降低时,透射带宽会明显变窄,且透射的峰值也会降低。滤波器结构仿真结果表明,滤波器具有很强的消光效果,在具有有效谐振频率的同时可以更好地实现阻碍非谐振频率。该研究对纳米等离子激元器件的实际应用具有一定的理论和实际意义。

关键词：表面等离子体激元(SPP) 波导环形滤波器消光效果谐振频率

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冯·莱特与“派生义务”悖论

武汉大学学报（人文科学版） 2002年第2期55卷 167-171页

作者：柳祥美衡阳师范学院法学院湖南衡阳421008

文中所说的“悖论”,只是指由道义逻辑中的某个定理推出的结论 ,与人们在直观上或常识上或习惯上的理解是不相符的 ,也不是通常说的那种会导致逻辑系统产生矛盾的悖论。作为道义逻辑开创者的冯·莱特 ,是如何看待和如何解决道义逻辑中... 详细信息

文中所说的“悖论”,只是指由道义逻辑中的某个定理推出的结论 ,与人们在直观上或常识上或习惯上的理解是不相符的 ,也不是通常说的那种会导致逻辑系统产生矛盾的悖论。作为道义逻辑开创者的冯·莱特 ,是如何看待和如何解决道义逻辑中几个著名的“派生义务”悖论问题的。

关键词：冯·特派生义务悖论