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Advancing microarray fabrication:One-pot synthesis and highresolution patterning of UV-crosslinkable perovskite quantum dots

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Nano Research 2024年第9期17卷 8600-8609页

作者： Linfeng Yuan Dejian Chen Kun He Jiamin xu kunyuan xu Jie Hu Sisi Liang Haomiao Zhu CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China University of Chinese Academy of Sciences Beijing 100049China College of Chemistry and Materials Science Fujian Normal UniversityFuzhou 350007China Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Research Center of Rare Earth MaterialsHaixi InstituteChinese Academy of SciencesXiamen 361021China

The development of highly efficient,solution-processable,and environmentally stable perovskite quantum dots(PQDs)is crucial for their accurate high-resolution patterning and subsequently enabling the practical deployment of PQD based emissive display *** study presents an innovative strategy for integrating all-inorganic PQDs and ultraviolet(UV)crosslinkable acrylate polymer at a structural and functional *** achievement is accomplished by meticulous design and one-pot synthesis of UV-crosslinkable CsPbX_(3)(X=Cl,Br,I)PQDs solution,which exhibit outstanding environmental *** the solution-processable characteristics of the resulting UV-crosslinkable PQDs,precise patterning of high-resolution(2μm,7608 pixels·in.^(-1))and colorful PQDs microarrays can be readily achieved through inkjet printing and high-throughput photolithography(~2μm in pitch line/space patterning).The UV cross-linked process guarantees a homogeneous distribution of PQDs,effectively mitigating coffee ring effect and improving the overall quality of stereoscopic *** photo-cured PQDs film,which undergoes free radical photopolymerization,displays an impressive photoluminescence quantum yield(PL QY)of up to 89.2%,reaching 98%of the value observed in the solution *** approach outlined in this research is both cost-effective and pragmatic,exhibiting tremendous promise for diverse system-level integrated optoelectronic devices,such as ultra-high-resolution micro-light-emitting device(micro-LED)displays.

关键词： perovskite quantum dots microarrays cross-linking strategy Inkjet printing photolithography

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Precursor chemistry towards highly efficient and phase-stable red emitting CsPbI_(3) perovskite nanocrystals

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Nano Research 2022年第1期15卷 644-652页

作者： Dejian Chen Decai Huang Mingwei Yang kunyuan xu Jie Hu Sisi Liang Haomiao Zhu CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Institute of Rare Earth MaterialsHaixi InstituteChinese Academy of SciencesXiamen 361021China

All-inorganic cesium lead halide perovskite nanocrystals(CsPbX_(3),X=Cl,Br,I)have attracted considerable scientific and technological interest due to their precise bandgap tunability,high color purity and efficient ***,their poor stability in harsh conditions such as moisture,ultraviolet(UV)light irradiation and high temperature,is a major obstacle for their further commercial ***,by simply using a new type of precursor,namely“HPbX_(3)”(X=Cl,Br,I),we can achieve the coordination equilibrium for Pb precursors during reaction and obtain high-quality perovskite nanocrystals with tremendously enhanced luminous efficiency and chemical stability based on hot-injection *** prepared a-CsPbb nanocrystals exhibit an extremely high photoluminescence quantum yield of 96%and keep stable in air for more than two months without any post-synthesis ***,stability evaluations under UV light irradiation,water or thermal impact are also performed and the results show substantially improved stability of these nanocrystals as compared with the samples prepared using traditional Pbl_(2) as *** temperature-dependent(10-300 K)steady and transient spectral analysis combined with compositional measurements,it is revealed that the lower structural defect density,which is guaranteed by abundant halogen when using HPbX3 as precursor,is the most important reason for such performance enhancement.

关键词： perovskite nanocrystals CsPbX_(3) precursor stability vacancy defect

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Organic polystyrene and inorganic silica double shell protected lead halide perovskite nanocrystals with high emission efficiency and superior stability

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Nano Research 2023年第7期16卷 10507-10514页

作者： Shujian Wang Dejian Chen kunyuan xu Jie Hu Decai Huang Maochun Hong Haomiao Zhu University of Science and Technology of China Hefei 230026China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341000China CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Research Center of Rare Earth MaterialsHaixi InstitutesChinese Academy of SciencesXiamen 361021China

The practical application of all-inorganic semiconductor lead halide perovskite nanocrystals(LHP NCs)has been limited by their poor ***,a lot of research on core-shell structure has been done to improve the stability of perovskite NCs,but the effect was far from the application ***,we,for the first time,report a convenient approach to synthesize organic-inorganic double shell CsPbBr_(3)@SiO_(2)@polystyrene(PS)NCs with an inter-core of CsPbBr_(3),the intermediate layer of SiO_(2)shell,and outmost PS ***,the CsPbBr_(3)@SiO_(2)@PS NCs maintained more than 90%of their initial photoluminescence(PL)intensity under one month's ultraviolet lamp irradiation or in 85℃ and 85%relative humidity(RH)*** white-light-emitting-diodes(WLEDs)were fabricated by encapsulating commercial InGaN chip with CsPbBr_(3)@SiO_(2)@PS NCs and K2SiF6:Mn^(4+)(KSF:Mn^(4+))phosphor with a luminous efficacy of~100 lm/W at 20 mA current and a color gamut of 128%of the National Television Standards Committee(NTSC)*** addition,these WLEDs still maintain 91%of the initial luminous efficacy after 1200 h of continuous *** results demonstrated that double shell-protected CsPbBr_(3)perovskite NCs have great potential in the field of WLEDs.

关键词： core-shell structure organic polystyrene(PS)inorganic SiO_(2)double shell CsPbBr_(3)@SiO_(2)@PS nanocrystals(NCs) high stability

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Ballistic transport in nanoscale self-switching devices

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Chinese Science Bulletin 2011年第21期56卷 2206-2209页

作者： CHEN ZiMin ZHENG ZhiYuan xu kunyuan WANG Gang State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen UniversityGuangzhou 510275China School of Physics and Telecommunication Engineering South China Normal UniversityGuangzhou 510631China

Using the Monte Carlo method,a type of semiconductor nano-device called self-switching device (SSD),which has diode-like I-V characteristics,was *** analyzing the microscopic transport behavior of the carriers,we show that the ballistic effects exist in the SSDs when the channel length of the device is extremely short (～120 nm).Furthermore,we show that the ballistic effect doubles the average drift velocity of the carriers (to ～6.0×107 cm/s) in short-channel SSDs,which decreases the transit *** implies that when the dimensions are decreased to nanoscale length,the SSD can operate much faster because the ballistic effect increases the operation speed of the ***,because of the ballistic transport,the energy efficiency may also be improved.

关键词：弹道输运开关设备纳米级蒙特卡罗方法通道长度操作速度开关器件纳米器件

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Synthesis and optical properties of highly efficient Na_(3)KMg_(7)(PO_(4))_(6):Eu^(2+)blue phosphor for full-spectrum white-light-emitting diodes:The role of Li_(2)CO_(3)flux

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Journal of Rare Earths 2024年第7期42卷 1217-1223,I0001页

作者： Zihao Wang Sisi Liang Chenyang Zhan kunyuan xu Jie Hu Dejian Chen Liping Song Haomiao Zhu School of Physics and Materials Science Nanchang UniversityNanchang330000China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou341000China CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou350002China Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Research Center of Rare Earth MaterialsHaixi InstituteChinese Academy of SciencesXiamen361021China

Full-spectrum phosphor-converted white-light-emitting diodes(pc-WLED)are emerging as a mainstream technology in semiconductor ***,high-performance blue phosphor which can be excited efficiently by a 400 nm NUV diode chip is still ***,we present a blue-emitting Na_(3)KMg_(7)(PO_(4))6:Eu^(2+)phosphor synthesized by the solid-reaction ***,we find that the using of Li_(2)CO_(3)as flux can significantly improve the crystal quality and thus the emission efficiency of the ***,the excitation peak of the phosphor shifts from 365 to 400 nm,which is pivotal for efficient NUV(400 nm)diode chip *** practical Eu^(2+)concentration is also enhanced by using Li_(2)CO_(3)as flux,and the absorption efficiency is greatly *** phosphor exhibits superior PL thermal stability,namely retains 94%integrated photoluminescence intensity at 150℃of that at 25℃.As a result,the optimized phosphor shows an emission band peaked at 437 nm with a bandwidth of 40 nm and a high external photoluminescence quantum yield of 51.7%.Finally,a pc-WLED was fabricated by using NKMPO:Eu^(2+)blue,Sr_(2)SiO_(4):Eu^(2+)green,CaAlSiN_(3):Eu^(2+)red phosphors,and a 400 nm NUV diode *** shows a high color rendering index of R_(a)=96.4 and a correlated color temperature of 4358 *** results prove that NKMPO:Eu^(2+)is a promising blue phosphor for full-spectrum WLED based on NUV diode chips.

关键词： Eu^(2+) Blue phosphor Na_(3)KMg_(7)(PO_(4))_(6) Full-spectrum white LEDs Rare earths

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Electronic Ratchet Nanodiodes

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Engineering（科研） 2009年第2期1卷 127-131页

作者： kunyuan xu Gang WANG 不详

Using a two-dimensional ensemble Monte Carlo (EMC) method, electronic nanometer devices with different parameters are studied in detail. Calculation results show that at nanoscale the electric properties of interface inside the devices play an important role in determining the working properties of the devices. By properly arranging device structures, surface charges originated from device fabrication can be exploited to produce a predetermined electric potential in the devices. Based on this fact, two structures that can lead to an asymmetric potential along their nanochannel are proposed for designing strong nonlinear devices. Further studies indicate that Ratchet effect brought by the asymmetric potential results in diode-like current-voltage characteristics of the devices. Through optimizing device parameters, zero threshold voltage can be achieved, which is desired for detecting applications. Moreover, since the devices are at nanoscale, simulation results reveal that used as rectifiers the working frequencies can be up to a few THz.

关键词： Ratchet Effect Nanodiode Asymmetric Monte Carlo

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基于可变形部件模型的遥感影像船只检测方法

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同济大学学报（自然科学版） 2017年第12期45卷 1887-1892页

作者：张绍明徐昆源张鹏王建梅同济大学测绘与地理信息学院上海200092 中国公路工程咨询集团有限公司北京100097

提出了一种基于混合可变形部件模型的船只检测方法.该方法采用基于梯度方向直方图(HOG)特征的可变形部件模型(DPM)来描述船只,在HOG特征金字塔空间通过滑窗方式检测目标.基于HOG特征的DPM不具有方向不变性,因此根据船只目标特点,分别从... 详细信息

提出了一种基于混合可变形部件模型的船只检测方法.该方法采用基于梯度方向直方图(HOG)特征的可变形部件模型(DPM)来描述船只,在HOG特征金字塔空间通过滑窗方式检测目标.基于HOG特征的DPM不具有方向不变性,因此根据船只目标特点,分别从模型训练阶段和目标检测阶段进行改进.在模型训练阶段,为了减少模板数量,将所有船只样本旋转到相同方向进行参数学习;在目标检测阶段,将兴趣区旋转至特定方向后进行模板匹配,实现遥感影像上任意方向的船只检测.利用该方法在高分二号光学遥感影像上进行船只检测,实验结果表明此方法可以有效检测船只.

关键词：可变形部件模型(DPM) 混合模型船只检测高分遥感影像

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以创新为灵魂走好纺织新型工业化道路

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中国纺织 2003年第1期 21-29页

作者：许坤元中国纺织工业协会

实现工业化是我国现代化建设进程中的历史性任务。党的十六大报告中指出:“坚持以信息化带动工业化,以工业化促进信息化,走出一条科技含量高、经济效益好、资源消耗低、环境污染少、人力资源优势得到充分发挥的新型工业化路子”,为我国... 详细信息

实现工业化是我国现代化建设进程中的历史性任务。党的十六大报告中指出:“坚持以信息化带动工业化,以工业化促进信息化,走出一条科技含量高、经济效益好、资源消耗低、环境污染少、人力资源优势得到充分发挥的新型工业化路子”,为我国在本世纪前20年基本实现工业化指明了前进的方向。

关键词：创新新型工业化中国纺织工业产业特征

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纺织工业趋势与预测

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中国纺织 2003年第3期 6-11页

作者：许坤元中国纺织工业协会

文章从多个方面分析了国内外纺织工业的发展趋势,并对2002年中国纺织工业的生产、销售、出口状况提供了完整、翔实的数据,指出有以下几个方面需要应对:国内市场国际化,国际市场国内化;单一企业竞争转向企业群体之间的竞争:一个供应链与... 详细信息

文章从多个方面分析了国内外纺织工业的发展趋势,并对2002年中国纺织工业的生产、销售、出口状况提供了完整、翔实的数据,指出有以下几个方面需要应对:国内市场国际化,国际市场国内化;单一企业竞争转向企业群体之间的竞争:一个供应链与另一个供应链,一个物流配送系统与另一个物流配流系统,一个企业参与的群体与另一个企业参与的群体的竞争;由生产能力竞争变成生产能力乘上流通能力的系数。企业的发展不仅取决于能生产多少适销产品,而取决于能将多少商品顺利地销售出去,取决于流通能力,流通已成为经济运行的先导力量,争夺销售终端,创造客户的竞争将十分激烈;由产品竞争转向品牌的竞争,企业从创造有型资产到创造无形资产,并对无形资产——品牌进行销售、许可、特许经营等商业性开发投资为目的的商业运作,最大限度地挖掘品牌的价值,推动竞争从低级形态转向高级形态;由单纯追求市场份额的竞争转向对市场快速反应能力的竞争。现代高新技术的发展,全球市场经济体制的趋同,世界贸易组织统一的“游戏规则”,已把一层层篱笆拆光了,使技术转移周期越来越短,商品更新换代越来越快,随着消费者消费水平的提高,其消费偏好越来越个性化、多样化和层次化,企业生命周期越来越短,必然重新组合。由价格战、广告战,单一形式?

关键词： 2002年中国纺织工业世界发展趋势市场预测国内市场国际市场

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太赫兹振荡器件之间同相位锁定机制的研究

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华南师范大学学报（自然科学版） 2018年第1期50卷 55-60页

作者：潘金涛王越许坤远华南师范大学物理与电信工程学院广州510006

基于单个平面太赫兹振荡器输出特性,深入分析了振荡器阵列中器件之间的相位关系.研究表明:将2个振荡器直接并联组成阵列时,由于器件之间的耦合较弱,两器件无法协同工作,因而输出信号随时间无规律波动.通过在器件之间引入额外的表面栅,... 详细信息

基于单个平面太赫兹振荡器输出特性,深入分析了振荡器阵列中器件之间的相位关系.研究表明:将2个振荡器直接并联组成阵列时,由于器件之间的耦合较弱,两器件无法协同工作,因而输出信号随时间无规律波动.通过在器件之间引入额外的表面栅,利用栅极偏压增强耦合,使器件工作于基波同相位锁定状态,从而输出幅度稳定、工作频率约为0.37 THz的信号.通过对器件沟道内部电子浓度分布的进一步分析发现,器件之间同相位锁定机制的微观实质为两沟道内部动力学偶极畴处于同步状态.由于双器件阵列的输出信号幅值为单器件的2倍,信号强度则为4倍,可见这种结构的设计实现了完全相干的功率合成.

关键词：太赫兹平面器件阵列表面栅极耦合

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