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Enhancing crystal integrity and structural rigidity of CsPbBr_(3) nanoplatelets to achieve a narrow colorsaturated blue emission

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light(Science & Applications) 2024年第5期13卷 985-997页

作者： Qianqian Huang Wenxu Yin Bo Gao Qingsen Zeng Dong Yao Hao Zhang Yinghe Zhao Weijia Zheng Jiaqi Zhang Xuyong Yang Xiaoyu Zhang andrey l.rogach Key laboratory of Automobile Materials MOE School of Materials Science&Engineeringand Jilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy MaterialsJilin UniversityChangchunChina. State Key laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchunChina. State Key laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhanHubeiChina. Department of Chemistry University of VictoriaVictoriaBCCanada. Key laboratory of Advanced Display and System Applications of Ministry of Education Shanghai UniversityShanghaiChina. Department of Materials Science and Engineering and Centre for Functional Photonics(CFP)City University of Hong KongHong Kong S.A.RChina

Quantum-confined CsPbBr_(3) perovskites are promising blue emitters for ultra-high-definition displays,but their soft lattice caused by highly ionic nature has a limited ***,we endow CsPbBr_(3) nanoplatelets(NPls)with atomic crystal-like structural rigidity through proper surface engineering,by using strongly bound N-dodecylbenzene sulfonic acid(DBSA).A stable,rigid crystal structure,as well as uniform,orderly-arranged surface of these NPls is achieved by optimizing intermediate reaction stage,by switching from molecular clusters to mono-octahedra,while interaction with DBSA resulted in formation of a Cs_(x)O monolayer shell capping the NPl *** a result,both structural and optical stability of the CsPbBr3 NPls is enhanced by strong covalent bonding of DBSA,which inhibits undesired phase transitions and decomposition of the perovskite phase potentially caused by ligand ***,rather small amount of DBSA ligands at the NPl surface results in a short inter-NPl spacing in their closely-packed films,which facilitates efficient charge injection and *** photoluminescence of the produced CsPbBr_(3) NPls is bright(nearly unity emission quantum yield)and peaks at 457 nm with an extremely narrow bandwidth of 3.7 nm at 80 K,while the bandwidth of the electroluminescence(peaked at 460 nm)also reaches a record-narrow value of 15 nm at room *** value corresponds to the CIE coordinates of(0.141,0.062),which meets Rec.2020 standards for ultra-high-definition displays.

关键词： temperature stability narrow

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Towards next generation white lEDs:opticselectronics synergistic effect in a single-layer heterophase halide perovskite

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light(Science & Applications) 2021年第3期10卷 310-312页

作者： andrey l.rogach Departm ent of Materials Science and Engineering and Centre for Functional Photonics(CFP)City University of Hong KongHong Kong SARPR China

A novel concept of the heterophase optics-electronics synergistic effect has been demonstrated in a single-layerα/δ-heterophase perovskite CsPbl3 in order to realize white lEDs featuring only one broadband emissive ... 详细信息

关键词： optics synergistic white

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Chiral carbon dots:synthesis,optical properties,and emerging applications

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light(Science & Applications) 2022年第4期11卷 542-564页

作者： Aaron Doring Elena Ushakova andrey l.rogach Department of Materials Science and Engineering and Centre for Functional Photonics(CFP)City University of Hong Kong83 Tat Chee AvenueKowloonHong Kong SARChina. Center of Information Optical Technologies ITMO UniversitySaint Petersburg 197101Russia. Shenzhen Research Institute City University of Hong Kong518057 ShenzhenChina

Carbon dots are luminescent carbonaceous nanoparticles that can be endowed with chiral properties,making them particularly interesting for biomedical applications due to their low cytotoxicity and facile *** recent years,synthetic efforts leading to chiral carbon dots with other attractive optical properties such as two-photon absorption and circularly polarized light emission have *** start this review by introducing examples of molecular chirality and its origins and providing a summary of chiroptical spectroscopy used for its *** approaches used to induce chirality in nanomaterials are *** the main part of this review we focus on chiral carbon dots,introducing their fabrication techniques such as bottom-up and top-down chemical syntheses,their morphology,and optical/chiroptical *** then consider emerging applications of chiral carbon dots in sensing,bioimaging,and catalysis,and conclude this review with a summary and future challenges.

关键词： properties synthesis chiral

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Template synthesis of silver indium sulfide based nanocrystals performed through cation exchange in organic and aqueous media

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Nano Research 2021年第7期14卷 2321-2329页

作者： Na Gao Rubo Zhang Bingkun Chen Jinfeng Zhang Xiaoling Zhang andrey l.rogach School of Chemistry and Chemical Engineering Beijing Institute of TechnologyBeijing 100081China School of Optics and Photonics Beijing Institute of TechnologyBeijing 100081China School of life Science Beijing Institute of TechnologyBeijing 100081China Department of Materials Science and Engineering and Centre for Functional Photonics(CFP)City University of Hong KongHong Kong SARChina

Heavy-metal-free silver based I-III-VI semiconductor nanocrystals(NCs),including ternary silver indium sulfide(AgInS_(2))and derivative quaternary silver indium zinc sulfide(i.e.,AgInZn_(2)S_(4))NCs,possess advantages of low toxicity,and size-tunable band gaps approaching near-infrared spectral range,which make them candidates for use in optoelectronic and biological ***,we report syntheses of AgInS_(2) based NCs starting from In_(2)S_(3) template,which have been performed both in organic and aqueous phase through cation *** a result,ternary silver indium sulfide and quaternary silver indium zinc sulfide NCs are obtained in both organic and aqueous media,and confirmed to be orthorhombic AgInS_(2) NCs and hexagonal AgInZn_(2)S_(4) NCs,***,the aqueous AgInZn_(2)S_(4) NCs with red emission and low cytotoxicity are explored for the cancer cell imaging.

关键词： template synthesis silver indium sulfide based nanocrystals cation exchange organic and aqueous media

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Aggregation-induced emission of copper nanoclusters

Aggregate

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Aggregate 2021年第6期2卷 28-42页

作者： Yu-e Shi Jinzhu Ma Anrui Feng Zhenguang Wang andrey l.rogach Key laboratory of Chemical Biology of Hebei Province Key Laboratory of Medicinal Chemistry and Molecular DiagnosisMinistry of EducationCollege of Chemistry&Environmental ScienceHebei UniversityBaodingP.R.China Department of Materials Science and Engineering&Centre for Functional Photonics(CFP) City University of Hong KongKowloonHong KongS.A.R.P.R.China

Copper nanoclusters(Cu NCs)have recently emerged as promising luminophores,featuring ultra-small size,reasonable photostability,large Stokes shift,and long emission ***-induced emission(AIE)has been often used to further improve both the emission intensity and stability of these clusters,with plenty of potential applications in the fields of chemical sensing and *** review starts with a summary of the current understanding of emission mechanisms of Cu NCs and proceeds with the analysis of contributions from the Cu metal core and the organic *** summarize the recent research progress on the design of ligands,and the ways on how to induce aggregation of the Cu NCs through electrostatic charge neutralization,host-guest interactions,and the use of *** also discuss the current understanding of emission mechanisms of Cu NCs experiencing AIE,such as the often-cited restriction of intramolecular motion and contributions from Cu(I)molecular *** finish this review by providing concluding remarks and offering our own perspective on the active field of AIE of Cu NCs,with a hope to further promote the research on the fundamental aspects of this useful phenomenon.

关键词： aggregation-induced emission copper nanoclusters surface ligands

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In-situ fabricated anisotropic halide perovskite nanocrystals in polyvinylalcohol nanofibers: Shape tuning and polarized emission

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Nano Research 2019年第6期12卷 1411-1416页

作者： linghai Meng Changgang Yang Jingjia Meng Yongzhi Wang Yong Ge Ziqiang Shao Guofeng Zhang andrey l.rogach Haizheng Zhong Beijing Key laboratory of Nanophotonics and Ultrafine Optoelectronic Systems School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing Engineering Research Center of Cellulose and Its Derivatives School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing H 100081China State Key laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006China Department of Materials Science and Engineering and Centre for Functional Photonics (CFP)City University of Hong KongHong Kong 999077China

We report an in-situ fabrication of halide perovskite (CH3NH3PbX3,CH3NH3 =methylammonium,MA,X =Cl,Br,I) nanocrystals in polyvinylalcohol (PVA) nanofibers (MAPbX3@PVA nanofibers) through electrospinning a perovskite precursor *** the content of the precursors increased,the resulting MAPbBr3 nanocrystals in PVA matrix changed the shape from ellipsoidal to pearl-like,and finely into *** MAPbBr3@PVA nanofibers show strong polarized emission with the photoluminescence quantum yield of up to 72%.We reveal correlations between the shape of in-situ fabricated perovskite nanocrystals and the polarization degree of their emission by comparing experimental data from the single nanofiber measurements with theoretical *** emission of MAPbBr3@PVA nanofibers can be attributed to the dielectric confinement and quantum confinement ***,nanofibers can be efficiently aligned by using parallel positioned conductor strips with an air gap as collector.A polarization ratio of 0.42 was achieved for the films of well-aligned MAPbBr3@PVA nanofibers with a macroscale size of 0.5 cm × 2 cm,which allows potential applications in displays,lasers,waveguides,etc.

关键词： lead halide perovskite nanofibers electrospinning anisotropy polarized emission

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Regeneration of spent cathodes of li-ion batteries into multifunctional electrodes for overall water splitting and rechargeable Zn-air batteries by ultrafast carbothermal shock

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Science China Materials 2022年第9期65卷 2393-2400页

作者： Xuerong Zheng Xin Zhao Junda lu Jihong li Zhengpei Miao Wei Xu Yida Deng andrey l.rogach State Key laboratory of Marine Resource Utilization in South China Sea School of Materials Science and EngineeringHainan UniversityHaikou 570228China Department of Materials Science and Engineering and Center for Functional Photonics(CFP)City University of Hong KongHong Kong S.A.R.999077China School of Materials Science and Engineering Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of EducationTianjin UniversityTianjin 300072China Jiangsu Genox Environmental Engineering Technology Co. Ltd.Nanjing 210012China

lithium-ion batteries(lIBs)are widely used in electric vehicles and consumer electronics and require reliable recycling *** this paper,we investigated how an ultrafast carbothermal shock treatment can be used to convert spent cathodes of lIBs(liNi_(0.8)Mn_(0.1)Co_(0.1)O_(2))into Ni/Ni-Mn-Co-O(N/NMCO)composites with a remarkable electrocatalytic performance toward oxygen evolution,oxygen reduction,and hydrogen evolution *** converted spent cathodes can be employed as cathodes and anodes in an overall water-splitting system,and they displayed a low overpotential of 1.61 V and remarkable stability at different current ***,N/NMCO electrodes can be used as cathodes in rechargeable Zn-air batteries,which displayed long-term stability(>30 h),high specific capacity(781 mA h g^(-1))and peak power density(137 mW cm^(-2)),as well as a small charge/discharge voltage gap of 0.71 ***,our study offers a“waste-to-treasure”strategy for the regeneration of spent cathodes of lIBs and their applications in other advanced energy storage and conversion technologies.

关键词： lithium-ion battery waste management carbothermal shock overall water splitting Zn-air battery

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Revealing the nature of optical activity in carbon dots produced from different chiral precursor molecules

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light(Science & Applications) 2022年第5期11卷 855-867页

作者： Ananya Das Evgeny V.Kundelev Anna A.Vedernikova Sergei A.Cherevkov Denis V.Danilov Aleksandra V.Koroleva Evgeniy V.Zhizhin Anton N.Tsypkin Aleksandr P.litvin Alexander V.Baranov Anatoly V.Fedorov Elena V.Ushakova andrey l.rogach Center of Information Optical Technologies ITMO UniversitySaint Petersburg 197101Russia Research Park Saint Petersburg State UniversitySaint Petersburg 199034Russia laboratory of Femtosecond Optics and Femtotechnology ITMO UniversitySaint Petersburg 197101Russia laboratory of Quantum Processes and Measurements ITMO UniversitySaint Petersburg 197101Russia Department of Materials Science and Engineering and Centre for Functional Photonics(CFP)City University of Hong KongKowloonHong Kong SAR 999077China Shenzhen Research Institute City University of Hong KongShenzhen 518057China

Carbon dots(CDs)are light-emitting nanoparticles that show great promise for applications in biology and medicine due to the ease of fabrication,biocompatibility,and attractive optical *** chirality,on the other hand,is an intrinsic feature inherent in many objects in nature,and it can play an important role in the formation of artificial complexes based on CDs that are implemented for enantiomer recognition,site-specific bonding,*** employed a one-step hydrothermal synthesis to produce chiral CDs from the commonly used precursors citric acid and ethylenediamine together with a set of different chiral precursors,namely,l-isomers of cysteine,glutathione,phenylglycine,and *** resulting CDs consisted of O,N-doped(and also S-doped,in some cases)carbonized cores with surfaces rich in amide and hydroxyl groups;they exhibited high photoluminescence quantum yields reaching 57%,chiral optical signals in the UV and visible spectral regions,and two-photon *** signals of CDs were rather complex and originated from a combination of the chiral precursors attached to the CD surface,hybridization of lower-energy levels of chiral chromophores formed within CDs,and intrinsic chirality of the CD *** DFT analysis,we showed how incorporation of the chiral precursors at the optical centers induced a strong response in their circular dichroism *** optical characteristics of these CDs,which can easily be dispersed in solvents of different polarities,remained stable during pH changes in the environment and after UV exposure for more than 400 min,which opens a wide range of bio-applications.

关键词： properties chiral carbon

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Photo-induced flexible semiconductor CdSe/CdS quantum rods alignment

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半导体学报:英文版 2023年第9期44卷 83-89页

作者： Wanlong Zhang Julian Schneider Maksym F.Prodanov Valerii V.Vashchenko andrey l.rogach Xiaocong Yuan Abhishek K.Srivastava Nanophotonics Research Center Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China State Key laboratory of Advanced Displays and Optoelectronics Technologies Department of Electronic&Computer EngineeringHong Kong University of Science and TechnologyHong Kong SARChina Department of Materials Science and Engineering and Centre for Functional Photonics(CFP) City University of Hong KongHong Kong SARChina

The anisotropic absorption and emission from semiconductor CdSe/CdS quantum rods(QRs)provide extra benefits among other photoluminescence *** photo-induced alignment technique,the QRs can be oriented in liquid crystal polymer matrix at a large *** this article,a 2D Dammann grating pattern,within“SKl”characters domains aligned QRs in composite film,was fabricated by multi-step photo exposure using several photo masks,and a continuous geometric lens profile pattern aligned QRs was realized by the single step polarization converting holographic irradiation *** polarized optical microscope and fluorescence microscope are employed to determine the liquid crystal director profiles and QRs anisotropic excitation *** have been able to orient the QRs in fine binary and continuous patterns that confirms the strong quantum rod aligning ability of the proposed ***,the proposed approach paves a way for photoinduced flexible QRs alignments to provide a highly specific and difficult-to-replicate security application at a large scale.

关键词： quantum rods photo alignment liquid crystal flexible alignment polarized emission

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基于荧光铜纳米团簇-有机金属框架复合物的TNT检测方法研究

基于荧光铜纳米团簇-有机金属框架复合物的TNT检测方法研究

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中国化学会第十三届全国分析化学年会

作者：王振光 andrey l.rogach 河北大学化学与环境科学学院 Department of Physics and Materials Science and Centre for Functional Photonics (CFP) City University of Hong Kong

金属纳米团簇是由金、银、铜等金属的几个至几十个原子组成的聚集体,它们的尺寸与电子的费米波长接近,出现了能级分离,电子吸收能量后可以在不同能级间跃迁,并回到基态发出荧光。与常用的荧光量子点、有机染料相比,金属团簇具有优良生... 详细信息

金属纳米团簇是由金、银、铜等金属的几个至几十个原子组成的聚集体,它们的尺寸与电子的费米波长接近,出现了能级分离,电子吸收能量后可以在不同能级间跃迁,并回到基态发出荧光。与常用的荧光量子点、有机染料相比,金属团簇具有优良生物相容性以及大的斯托克位移。然而稳定性差与荧光量子产率低的缺点一定程度上限制了其应用。本文中我们通过构建荧光铜纳米团簇-有机金属框架复合物(MOFs)来提高其稳定性与荧光量子产率。通过自组装的方法将铜纳米团簇嵌入MOFs的结构里面,利用MOFs的刚性结构限制通纳米团簇上配体的分子转动,从而提高发光效率,同时可以有效防止氧分子与铜的反应,从而提高了其荧光稳定性。此外,荧光铜纳米团簇-MOFs复合物的荧光可以选择性的被爆炸物(TNT)猝灭,并用于构建TNT的分析检测方法,荧光强度与TNT浓度在5.0×10与8.0×10mol/l浓度范围内具有良好的线性关系,检测线低至8.5μM,同时对TNT类似物(苯,甲苯,二硝基甲苯)具有良好的选择性。

关键词：金属纳米团簇有机金属框架荧光分析爆炸物

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