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Incorporation sodium ions into monodisperse lead-free double perovskite Cs_(2)AgBiCl_(6) nanocrystals to improve optical properties

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Chinese Chemical Letters 2024年第3期35卷 549-553页

作者： Song Wang Ying Xie Wenchao Jiang Binghang Liu Keying Shi Kai Pan Key Laboratory of Functional Inorganic Material Chemistry Ministry of EducationHeilongjiang UniversityHarbin 150080China School of Materials Science and Engineering Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and ApplicationsChangzhou UniversityChangzhou 213164China State Key Laboratory of Catalysis Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China

Lead-free double perovskite nanocrystals(NCs)have emerged as a promising candidate in the optical field,owing to their non-toxic,good moist heat and chemical ***,their poor optical properties limited their *** improve the optical properties of lead-free double perovskite NCs,metal ion doping or alloying had been suggested as a promising ***,we prepared monodisperse,uniformly sized,cubic morphology of Cs_(2)AgBiCl_(6)NCs with different Na^(+)incorporation amounts via a simple hot-injection *** Na^(+)incorporation broke the parity-forbidden transition by reducing the inversion symmetry of the electron wave function at the Ag site,which changed the parity of the self-trapped exciton wave function and thus allowed radiative *** a result,the photoluminescence quantum yield(PLQY)of Na^(+)-alloyed Cs_(2)AgBiCl_(6)NCs(12.1%)was higher than that of Cs_(2)AgBiCl_(6)NCs(2.4%),and the exciton lifetime of Na^(+)-alloyed Cs_(2)AgBiCl_(6)NCs increased to 36.98 ns from 17.58 ns for Cs_(2)AgBiCl_(6)*** adjusting the amount of Na^(+)incorporation,the band gap of Cs_(2)AgBiCl_(6)NCs can be significantly tuned from~2.90 eV to~3.50 ***,the temperature-dependent photoluminescence spectra indicated that the Na^(+)-alloyed Cs_(2)AgBiCl_(6)NCs possessed higher longitudinal optical phonon energy and exciton binding energy compared to Cs_(2)AgBiCl_(6)*** suggested that there were strong exciton-phonon interactions during exciton recombination,a reduced probability of non-radiative processes,and excellent thermal *** offers a promising strategy for improving the optical properties of lead-free double perovskite NCs,and have the potential to replace traditional lead halide perovskite NCs in future optoelectronic applications.

关键词： nanocrystals Alloy Double perovskites Optical properties Exciton binding energy

Boosting self-trapped exciton emission from Cs_(3)Cu_(2)I_(5)nanocrystals by doping-enhanced exciton-phonon coupling

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Nano Research 2023年第7期16卷 10476-10482页

作者： Xiaohan Li Aijun Liu Zhaoyu Wang Youchao Wei Qun Lin Yameng Chen Yongsheng Liu Maochun Hong College of Chemistry Fuzhou UniversityFuzhou 350116China State Key Laboratory of Structural Chemistry 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 School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China

Self-trapped excitons(STEs)emission from halide perovskites with strong exciton-phonon coupling has attracted considerable attention due to the widespread application in optoelectronic ***,the in-depth understanding of the relationship between exciton-phonon coupling and luminescence intensity remains ***,a doping-enhanced exciton-phonon coupling effect is observed in Cs_(3)Cu_(2)I_(5)nanocrystals(NCs),which leads to a remarkable increasement of their STEs emission *** study shows that the hetero-valent substitution of Cu+with alkaline-earth metal ions(AE^(2+))causes a greater degree of Jahn-Teller distortion between the ground state and excited state structures of[Cu_(2)I_(5)]_(3)-clusters as evidenced by our spectral analysis and first-principles *** a consequence,an X-ray detector based on these Cs_(3)Cu_(2)I_(5):AE NCs delivers an X-ray imaging resolution of up to 10 lp·mm^(-1) and a low detection limit of 0.37μGyair·s^(-1),disclosing the potential of doping-enhanced exciton-phonon coupling effect in improving STEs-emission and practical application for X-ray imaging.

关键词： Cs_(3)Cu_(2)I_(5) nanocrystals self-trapped exciton exciton-phonon coupling X-ray image

Laser-induced inverted patterning of nanocrystals embedded glass for micro-light-emitting diodes

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Journal of Materials Science & Technology 2023年第19期150卷 138-144页

作者： Yuzhou Hu Ying Ye Wenchao Zhang Kai Li Yao Zhou Yudong Zhang Zhao Deng Jianjun Han Xiujian Zhao Chao Liu State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

High resolution and full-color light-emitting diodes require precise and efficient patterning of light-emitting structures containing quantum dots or *** report light-induced inverted patterning of nanocrystals in glasses for micro-light-emitting *** laser pulse induces structural destruction and amorphization of nanocrystals in glasses,forming inverted luminescent ***-throughput patterning of micrometer-scale,thermally stable,and highly photoluminescent structures in nanocrystals embedded glass is *** patterning method provides a novel way to fabricate high-performance and ultrahigh-resolution color conversion layers for micrometer-scale light-emitting diodes.

关键词： nanocrystals Ultrafast laser Sub-micro patterning Micro-light-emitting-diodes

Solution-processed electroluminescent whitelight-emitting devices based on AIE molecules and Cu-In-Zn-S nanocrystals

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Photonics Research 2022年第11期10卷 2622-2627页

作者： PEIWEI LV ZHENYANG LIU JINXING ZHAO ZUPING XIONG LIJIN WANG XU LI ZHAOSHENG QIAN AIWEI TANG Key Laboratory of Luminescence and Optical Information Ministry of EducationSchool of Physical Science and EngineeringBeijing Jiaotong UniversityBeijing 100044China Hebei Key Laboratory of Optic-Electronic Information and Materials College of Physics Science and TechnologyHebei UniversityBaoding 071002China College of Chemistry and Life Sciences Zhejiang Normal UniversityJinhua 321004China

Solution process is a key technique for the manufacture of large-area and low-cost semiconducting devices and,thus, attracts a lot of attention from both academia and industry. Herein, we realized solution-processed lightemitting diodes(excluding a cathode) based on aggregation-induced emission(AIE) molecules of tetraphenylethylene-4Cl(TPE-4Cl) and cadimum-free semiconductor nanocrystals(NCs) for the first time. By mixing Cu-In-Zn-S NCs and TPE-4Cl as an emissive layer, a new type of environmentally friendly white-light-emitting diodes(WLEDs) was prepared through a solution-processed technique. After systematical optimization of the asprepared WLEDs, the corresponding color rendering index can reach up to 87 with a maximum luminance of262 cd/m2. This study may pave a new road to realize AIE-based WLEDs through a solution-processed technique.

关键词： technique nanocrystals AIE

Ternary phase diagram of all-inorganic perovskite CsPbCl_(a)Br_(b)I_(3−a−b)nanocrystals

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Nano Research 2022年第8期15卷 7590-7596页

作者： Xin Lv Gaoyu Chen Xia Zhu Jiakun An Jianchun Bao Xiangxing Xu Jiangsu Key Laboratory of Biofunctional Materials Jiangsu Key Laboratory of New Power BatteriesSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210046China

All-inorganic lead halide perovskite CsPbX3(X=Cl,Br,and I)nanocrystals(NCs)have shown great application prospects in optoelectronic *** properties can be feasibly tuned by the ratio of different halide ***-synthesis halide anion exchange of Cl‒Br or Br‒I in CsPbX3 NCs allows getting any desired composition of CsPbClxBr3−x and CsPbBr_(x)I_(3−x)(0≤x≤3).However,due to the large difference of the Cl and I radii,they can only substitute each other in a limited ratio to form CsPbCl_(y)I_(3−y)(0

关键词： all-inorganic perovskite nanocrystals anion exchange ternary phase diagram

Surface Treatment of Inorganic CsPbI_(3) nanocrystals with Guanidinium Iodide for Efficient Perovskite Light-Emitting Diodes with High Brightness

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Nano-Micro Letters 2022年第4期14卷 277-288页

作者： Minh Tam Hoang Amandeep Singh Pannu Yang Yang Sepideh Madani Paul Shaw Prashant Sonar Tuquabo Tesfamichael Hongxia Wang Faculty of Science School of Chemistry and PhysicsQueensland University of TechnologyBrisbaneQLD 4001Australia Centre for Materials Science Queensland University of TechnologyBrisbaneQLD 4001Australia School of Mechanical Medical and Process EngineeringFaculty of EngineeringQueensland University of TechnologyBrisbaneQLD 4001Australia Centre for Organic Photonics&Electronics(COPE) School of Chemistry and Molecular BiosciencesThe University of QueenslandBrisbaneQLD 4072Australia

The remarkable evolution of metal halide perovskites in the past decade makes them promise for next-generation optoelectronic *** particular,nanocrystals(NCs)of inorganic perovskites have demonstrated excellent performance for light-emitting and display ***,the presence of surface defects on the NCs negatively impacts their performance in ***,we report a compatible facial post-treatment of CsPbI_(3) nanocrystals using guanidinium iodide(GuI).It is found that the GuI treatment effectively passivated the halide vacancy defects on the surface of the NCs while offering effective surface protection and exciton confinement thanks to the beneficial contribution of iodide and guanidinium *** a consequence,the film of treated CsPbI_(3) nanocrystals exhibited significantly enhanced luminescence and charge transport properties,leading to high-performance light-emitting diode with maximum external quantum efficiency of 13.8%with high brightness(peak luminance of 7039 cd m^(−2) and a peak current density of 10.8 cd A^(−1)).The EQE is over threefold higher than performance of untreated device(EQE:3.8%).The operational half-lifetime of the treated devices also was significantly improved with T50 of 20 min(at current density of 25 mA cm^(−2)),outperforming the untreated devices(T50~6 min).

关键词： CsPbI_(3)perovskites nanocrystals Light-emitting diodes Photoluminescence Surface passivation Guanidinium iodide

Aluminum nanocrystals evolving from cluster to metallic state:Size tunability and spectral evidence

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Nano Research 2022年第2期15卷 838-844页

作者： Hao Wu Xiaoyu Cheng Hongguang Dong Songjun Xie Sailing He National Engineering Research Centre for Optical Instruments College of Optical Science and EngineeringZhejiang UniversityHangzhou 310058China Ningbo Research Iristitute Ningbo 315100China

Sub-3 nm aluminum(Al)nanocrystal is an emerging class of nanomaterial with properties distinct to noble metal *** complete solution synthesis of aluminum nanoclusters was recently reported,and their photoluminescence(PL)was observed for the first *** the moment,there exists no method to tune the size of ultrasmall aluminum nanocrystals in solution thus no knowledge on the boundary state between aluminum nanoclusters to plasmonic *** this work,it is demonstrated a study of size-controlled solution synthesis of ultrasmall aluminum nanocrystals with size controlled between -2.2 and -3.8 *** the size results in three sets of spectral responses:(1)absorption due to nascent plasmons generated at -340 nm for larger particles,confirmed by Mie theory calculations;(2)significant decreased quantum yield of PL from -7.8%to -2.4%,indicating reduced quantum confinement effects and increased metallicity;(3)drop of fluorescence lifetime was observed,especially when the diameter of aluminum nanoparticles was changed from -3.0 to -3.8 *** study provides experimental evidence and insights to the transitional state between aluminum nanoclusters and plasmonic nanoparticles,which seems to occur at size larger than gold nanoclusters.

关键词： aluminum nanocrystals plasmon nanoclustors photoluminescence

Metal phenolic network-stabilized nanocrystals of andrographolide to alleviate macrophage-mediated inflammation in-vitro

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Chinese Chemical Letters 2023年第1期34卷 225-229页

作者： Kosheli Thapa Magar George Frimpong Boafo Makhloufi Zoulikha Xiaohong Jiang Xiaotong Li Qingqing Xiao Xuyang Xing Xiaochun Wang Lifang Fan Zhenfeng Wu Wei He School of Pharmacy China Pharmaceutical UniversityNanjing 211198China Jiangsu Aosaikang Pharmaceutical Co. Ltd.Nanjing 211112China Key Laboratory of Modern Preparation of TCM Ministry of EducationJiangxi University of Chinese MedicineNanchang 330004China

Macrophages play a crucial role in initiating,maintaining,and resolving inflammation through the phenotypic shift,inducing or inhibiting the production of inflammatory ***,macrophages are potential targets for treating inflammatory ***(AND)is a potent anti-inflammatory drug that can reduce pro-inflammatory cytokines and suppress NF-κB/MAPK pathway in activated *** AND has many medicinal properties,its lower water solubility and first-pass effect in the liver have hindered its clinical *** this context,by using a metal phenolic network as a stabilizer,we designed and prepared highly stabilized AND nanocrystals(AND-MPN Ns)with high drug loading capacity to facilitate the clinical application of *** findings showed that AND-MPN Ns could be used to enhance the anti-inflammation in-vitro via macrophage polarization,reducing proinflammatory cytokines IL-6 and TNF-α,and suppressing the NF-κB signaling pathway *** results demonstrated the potential of AND-MPN Ns to combat inflammatory diseases effectively.

关键词： Inflammation Macrophages Andrographolide Metal phenolic network nanocrystals

Green and controllable fabrication of nanocrystals from ionic liquids

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Chinese Chemical Letters 2022年第8期33卷 4079-4083页

作者： Weizi Huang Zhezheng Fang Xianzi Zheng Jianping Qi Wei Wu Yi Lu Key Laboratory of Smart Drug Delivery of MOE School of PharmacyFudan UniversityShanghai 201203China Center for Medical Research and Innovation Shanghai Pudong HospitalFudan University Pudong Medical CenterShanghai 201399China

nanocrystals are of great value in delivering poorly soluble drugs as a technique enables enhanced dissolution and *** bottom-up technique allows better control of particle ***,the commonly used organic solvents are hazardous to environment and operators,and always lead to large particle size and wide size distribution due to failure on controlling the nucleation and crystal *** situation is exacerbated in scale-up ***,in the proof-of-concept study,we evaluated the feasibility of green and controllable fabrication of drug nanocrystals by using biocompatible ionic liquids(ILs)as *** based ILs(Ch-ILs)were synthesized via metathesis *** paclitaxel nanocrystals of high quality were obtained from Ch-ILs with surface tension higher than 42 m N/*** sizes were below 250 nm,while the polydispersity indexes were lower than *** with ethanol,choline lactate is superior in controlling the size of the nanocrystals in scale-up production,where the drug concentration was increased by 6 *** underlying mechanism may be due to the high viscosity and low surface tension of the ILs,which are supposed to benefit homogeneous and burst ***-ILs can be recycled from the process and recovery rate reached 91.1%.Moreover,the applicability of the green technique was validated in a wider range of model drugs and *** conclusion,ILs are potent solvents in bottom-up technique for green and controllable fabrication of nanocrystals.

关键词： nanocrystals Ionic liquids Bottom-up Choline Organic acids Particle size