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Room temperature preparation of highly stable cesium lead halide perovskite nanocrystals by ligand modification for white lightemitting diodes

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Nano Research 2021年第8期14卷 2770-2775页

作者： Yu Zhang Guishun Li Changkun She Shaohua Liu Fangyu Yue Chengbin Jing Ya Cheng Junhao Chu Engineering Research Center for Nanophotonics and Advanced Instrument of Ministry of Education Key Laboratory of Polar Materials and Devices(Ministry of Education)The Extreme Optoelectromechanics LaboratoryDepartment of MaterialsSchool of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China

The poor stability of halide perovskite nanocrystals(NCs)has severely hindered future practical ***,we proposed a facile and effective ligand modification route to synthesize stable CsPbBr_(3) nanocrystals by introducing a double-terminal ligand,namely 4,4'-Azobis(4-cyanovalericacid)(CA),to replace the conventional oleic acid(OA)ligand at room *** as-synthesized CsPbBr_(3)-CA not only possesses high photoluminescence quantum yield(72%)related to the reduced trap defects,but also shows significantly improved stability exposure to water,ethanol,light,and/or heat benefiting from the CA ligand anchored to NC surfaces *** photoluminescence intensity of CsPbBr_(3)-CA maintains about 80%and 75%of its initial emission intensity after immersed in water or ethanol for 360 min,respectively,whereas that of the CsPbBr_(3)-OA was quenched completely within a few ***,an all-inorganic white light-emitting diode(LED)covered 126%National Television System Committee(NTSC)standard and 92%Rec.2020 standard was fabricated by combining the green CsPbBr_(3)-CA and commercial red-emitting K2SiF6:Mn4+(KSF)phosphors onto a blue LED ***,the presented work initiates the development of the room temperature preparation of high quality CsPbBr_(3) and shows prospect for next-generation displays.

关键词： perovskite nanocrystals ligand modification stability white light-emitting diode

Optical studies of semiconductor perovskite nanocrystals for classical optoelectronic applications and quantum information technologies: a review

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Advanced Photonics 2020年第5期2卷 11-25页

作者： Zengle Cao Fengrui Hu Chunfeng Zhang Shining Zhu Min Xiao Xiaoyong Wang Nanjing University College of Engineering and Applied SciencesSchool of PhysicsCollaborative Innovation Center of Advanced MicrostructuresNational Laboratory of Solid State MicrostructuresNanjingChina University of Arkansas Department of PhysicsFayettevilleArkansasUnited States

Semiconductor perovskite films are now being widely investigated as light harvesters in solar cells with ever-increasing power conversion efficiencies,which have motivated the fabrication of other optoelectronic devices,such as light-emitting diodes,lasers,and *** superior material and optical properties are shared by the counterpart colloidal nanocrystals(NCs),with the additional advantage of quantum confinement that can yield size-dependent optical emission ranging from the near-UV to near-infrared *** far,intensive research efforts have been devoted to the optical characterization of perovskite NC ensembles,revealing not only fundamental exciton relaxation and recombination dynamics but also lowthreshold amplified spontaneous emission and novel superfluorescence ***,the application of single-particle spectroscopy techniques to perovskite NCs has helped to resolve a variety of optical properties for which there are few equivalents in traditional colloidal NCs,mainly including nonblinking photoluminescence,suppressed spectral diffusion,stable exciton fine structures,and coherent singlephoton *** the main purpose of ensemble optical studies is to guide the smooth development of perovskite NCs in classical optoelectronic applications,the rich observations from single-particle optical studies mark the emergence of a potential platform that can be exploited for quantum information technologies.

关键词： perovskite nanocrystals optical studies single-particle spectroscopy transient absorption optoelectronic applications quantum information technologies

Colorimetric Determination of Chloridion in Domestic Water Based on the Wavelength Shift of CsPbBr_(3) perovskite nanocrystals via Halide Exchange

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Journal of Analysis and Testing 2021年第1期5卷 3-10页

作者： Guo-Bin Huang Zhi-Yong Guo Ting-Xiu Ye Chen Zhang Yan-Mei Zhou Qiu-Hong Yao Xi Chen Institute of Analytical Technology and Smart Instruments and Colleague of Environment and Public Healthy Xiamen Huaxia UniversityXiamen 361024China College of Pharmacy Xiamen Medical CollegeXiamen 361023China College of Chemistry Chemical Engineering and EnvironmentMinnan Normal UniversityZhangzhou 363000China Xiamen Key Laboratory of Food and Drug Safety Xiamen Huaxia UniversityXiamen 361005China State Key Laboratory of Marine Environmental Science Xiamen UniversityXiamen 361024China

Cubic phase CsPbBr_(3)perovskite nanocrystals(PNCs)was prepared by a high-temperature hot-injection *** high photoluminescence quantum yield(PLQY)of as-prepared CsPbBr_(3)PNCs was 87%,which can be used for the determination of chloridion in domestic water samples based on their wavelength-shift characteristics via halide *** proposal approach for the determination of chloridion reveals a linear correlation ranged from 10 to 200μM of the chloridion concentration and the wavelength shift of CsPbBr_(3)PNCs with a correlation coe fficient of R^(2)=*** as-mentioned method reveals neglectable responses towards those co-existing ions in the water aside from chloridion,due to the quick exchange between Cl and Br and the outstanding color change caused by wavelength *** strategy has been applied to the determination of chloridion in water samples with the recoveries of 98.9–104.2%and the limit of detection(LOD)of 4μ*** results show that the suggested approach is promising for the development of novel fluorescence detection for chloridion in water.

关键词： CsPbBr_(3) perovskite nanocrystals Wavelength shift Chloridion

High-Temperature Synthesis in Nonpolar Solvent for CsPbBr3 and CH3NH_3PbBr3 perovskite nanocrystals with High-Efficient Luminescence

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Wuhan University Journal of Natural Sciences 2017年第5期22卷 429-434页

作者： LIU Xiaodan WANG Qiang CHENG Ziqiang ZHOU Li WANG Ququan Key Laboratory of Artificial Micro-and Nano-structures ofthe Ministry of Education School of Physics and TechnologyWuhan UniversityWuhan 430072HubeiChina

We report a method to synthesize both organicinorganic CH3NH3PbBr3 and all-inorganic CsPbBr3 perovskite nanocrystals in nonpolar solvent at high temperature. The cesium oleate and CH3NH3Br （MABr） are prepared and then injected into the nonpolar solvent of octadecene including oleic acid, oleylamine, and lead halide. In the synthesis of organic-inorganic perovskites of CHaNH3PbBr3, the frequently-used polar solvent of dimetbylformamide or other polar solvents are not used. The prepared CsPbBr3 nanocrystals are spherical nanoparticles with the diameter of 250 nm. The CHaNH3PbBr3 perovskites are micro-scale hexagonal nanoplatelets. The colloidal perovskites exhibit high-efficient fluorescence and excellent stability.

关键词： perovskite nanocrystals luminescence nonpolar solvent

Near UV luminescent Cs_(2)NaBi_(0.75)Sb_(0.25)Cl_(6)perovskite colloidal nanocrystals with high stability

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Chinese Chemical Letters 2022年第1期33卷 537-540页

作者： Huixian Yang Yanmei Guo Guoning Liu Ruowei Song Jinxi Chen Yongbing Lou Yixin Zhao School of Chemistry and Chemical Engineering Jiangsu Key Laboratory for Science and Application of Molecular FerroelectricsJiangsu Engineering Laboratory of Smart Carbon-Rich Materials and DevicesSoutheast UniversityNanjing 211189China School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Near UV highly luminescent colloidal Cs_(2)NaBiCl_(6)nanocrystals(NCs)were synthesized by a simple low-cost ligand-assisted reprecipitation *** our strategy,metal chloride precursors were added to the mixture of anti-solvent and ligand at *** obtained Cs_(2)NaBiCl_(6)NCs exhibited a bright blue emission with significantly improved photoluminescence quantum yield(PLQY)of 39.05%.The optical properties and stability were greatly enhanced by doping Sb where Cs_(2)NaBi_(0.75)Sb_(0.25)Cl_(6)showed a high PLQY of 46.57%,and both the powder and the colloidal solution exhibited superior stability.

关键词： perovskite nanocrystals Ligand-assisted reprecipitation Stability Cs_(2)NaBiCl_(6) Cs_(2)NaBi_(0.75)Sb_(0.25)Cl_(6)

Synthesis and transformation of zero-dimensional Cs3BiX6(X=Cl,Br)perovskite-analogue nanocrystals

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Nano Research 2020年第1期13卷 282-291页

作者： Hanjun Yang Tong Cai Exian Liu Katie Hills-Kimball Jianbo Gao Ou Chen Department of Chemistry Brown University324 Brook StreetProvidenceRhode Island02912USA Ultrafast Photophysics of Quantum Devices Laboratory Department of Physics and AstronomyClemson UniversityClemsonSouth Carolina29634USA

The unique structure of zero-dimensional(0D)perovskite-analogues has attracted a great amount of research interest in recent *** date,the current compositional library of 0D perovskites is largely limited to the lead-based Cs4PbX6(X=Cl,Br,and I)*** this work,we report a new synthesis of lead-free 0D Cs3BiX6(X=Cl,Br)perovskite-analogue nanocrystals(NCs)with a uniform cubic *** observe a broad photoluminescence peak centered at 390 nm for the 0D Cs3BiCl6 NCs at low *** feature originates from a self-trapped exciton *** situ thermal stability studies show that Cs3BiX6 NCs remain stable upon heating up to 200°C without crystal structural ***,we demonstrate that the Cs3BiX6 NCs can transform into other bismuth-based perovskite-analogues via facile anion exchange or metal ion insertion *** study presented here offers the opportunity for further understanding of the structure-property relationship of 0D perovskite-analogue materials,leading toward their future optoelectronic applications.

关键词： perovskite nanocrystals zero-dimensional perovskite-analogue bismuth-based perovskite post-synthetic reactions anion exchange

Room-temperature synthesis of full-component APbX_(3)perovskite nanocrystal inks for optoelectronic applications

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Journal of Energy Chemistry 2024年第5期92卷 87-94页

作者： Xinyu Zhao Du Li Xuliang Zhang Hehe Huang Chenyu Zhao Wanli Ma Jianyu Yuan Institute of Functional Nano&Soft Materials(FUNSOM) Soochow UniversitySuzhou 215123JiangsuChina Jiangsu Key Laboratory for Carbon-Based Functional Materials&Devices Soochow UniversitySuzhou 215123JiangsuChina Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow UniversitySuzhou 215123JiangsuChin

Lead halide perovskite nanocrystals(PNCs)have received great research interests due to their excellent optoelectronic ***,high temperature,inert gas protection and insulating long-chain ligands are used during the conventional hot-injection synthesis of PNCs,which limits their practical *** this work,we first develop a simple and scalable polar-solvent-free method for the preparation of full-component APbX_(3)(A=Cs,methylammonium(MA),formamidinium(FA),X=Cl,Br,I)PNCs under ambient *** an exothermic reaction between butylamine(BA)and propionic acid(PA)short ligands,the PbX_(2) precursors could be well dissolved without use of any polar ***,the relatively lower growth rate of PNCs in our room-temperature reaction enables us to modulate the synthetic procedure to enhance the scalability(40-fold)and achieve large-scale *** resultant short ligands passivated PNC inks are compatible with varying solution depositing technique like spray coating for large-area ***,we showcase that adopting the as-prepared MAPbI_(3) PNC inks,a self-powered photodetector is fabricated and shows a high *** results demonstrate that our ambient-condition synthetic approach can accelerate the preparation of tunable and ready-to-use PNCs towards commercial optoelectronic applications.

关键词： Room-temperaturesynthesis perovskite nanocrystals Short-chainligands Large-scale Photodetector

钙钛矿纳米晶固体中普遍存在的、显著的激子转移（英文）

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Science China Materials 2024年第9期67卷 2818-2827页

作者：罗余庆党志亚孟令晨陈泽龙黎梓豪路通通饶小斌赵书苑孙祺高平奇 School of Materials Shenzhen Campus of Sun Yat-sen University State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen University State Key Laboratory of Molecular Reaction Dynamics and the Dynamic Research Center for Energy and Environmental Materials Dalian Institute of Chemical PhysicsChinese Academy of Sciences

钙钛矿纳米晶(PNC)固体是很有前景的光电应用材料.最近的研究表明,PNC固体中的激子扩散通过交替的激子跳跃(EH)和光子循环(PR)而实现.PNC固体中尺寸分布引起的能量不均一性是普遍存在的,目前尚不清楚该因素对激子扩散的影响.在这里,我... 详细信息

钙钛矿纳米晶(PNC)固体是很有前景的光电应用材料.最近的研究表明,PNC固体中的激子扩散通过交替的激子跳跃(EH)和光子循环(PR)而实现.PNC固体中尺寸分布引起的能量不均一性是普遍存在的,目前尚不清楚该因素对激子扩散的影响.在这里,我们通过透射模式的多波段稳态和瞬态光致发光(PL)光谱学测试,研究了尺寸呈高斯分布(边长约为11.2±6.8 nm)的CsPbBr3 NC固体中的激子扩散.我们的研究结果表明,激子沿着能量降低的方向在不同能量位点之间进行转移,这一过程支配着PNC固体的激子扩散,低温PL分析结果进一步证实了这一点.更为详细的研究揭示出,受体分布与吸收系数共同决定了EH和PR在不同能量位点之间的激子转移中所做的贡献.因此,在不同厚度的PNC固体中,激子扩散机制有所不同:高能位点向较低能位点的EH和PR效率高,主导着几百纳米薄膜中的激子转移;在数微米的厚膜中,从中等能量位点向低能位点的、主要通过PR而进行的激子转移也变得明显起来.这些发现不仅使我们进一步理解了受体分布在PNC固体的激子扩散过程中所起的关键作用,也为基于PNC固体的光电应用提供了重要基础和指导.我们的工作还利用常规的测试手段来深入研究激子扩散过程,有利于揭示以往的表面PL成像方法所隐藏了的关于材料内部激子扩散的信息.

关键词： photoluminescence spectroscopy exciton diffusion exciton transfer perovskite nanocrystals photon recycling exciton hopping reabsorption

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Temperature-controlled multisensory neuromorphic devices for artificial visual dynamic capture enhancement

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Nano Research 2023年第5期16卷 7661-7670页

作者： Gengxu Chen Xipeng Yu Changsong Gao Yan Dai Yanxue Hao Rengjian Yu Huipeng Chen Tailiang Guo National&Local United Engineering Laboratory of Flat Panel Display Technology Institute of Optoelectronic DisplayCollege of Physics and Information EngineeringFuzhou UniversityFuzhou 350108China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350100China

Multi-sensory neuromorphic devices(MND)have broad potential in overcoming the structural bottleneck of von Neumann in the era of big ***,the current multisensory artificial neuromorphic system is mainly based on unitary nonvolatile memory or volatile synaptic devices without intrinsic thermal sensitivity,which limits the range of biological multisensory perception and the flexibility and computational efficiency of the neural morphological computing ***,a temperature-dependent memory/synaptic hybrid artificial neuromorphic device based on floating gate phototransistors(FGT)is *** CsPbBr_(3)/TiO_(2)core–shell nanocrystals(NCs)prepared by in-situ pre-protection low-temperature solvothermal method were used as the photosensitive *** device exhibits remarkable multi-level visual memory with a large memory window of 59.6 V at room ***,when the temperature varies from 20 to 120℃back and forth,the device can switch between nonvolatile memory and volatile synaptic device with reconfigurable and reversible behaviors,which contributes to the efficient visual/thermal fusion *** work expands the sensory range of multisensory devices and promotes the development of memory and neuromorphic devices based on organic field-effect transistors(OFET).

关键词： floating gate phototransistors perovskite nanocrystals temperature multisensory neuromorphic devices