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Unraveling post-growth mechanisms of monolayer CsPbBr3 nanocubes:Laser-enhanced transformations and cathodoluminescence-electron microscopy correlations

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Journal of Energy Chemistry 2025年第1期100卷 146-156页

作者： Mingxing Li Xiaoge Wang Xiaofan Cao Zhiqun He Chunjun Liang Mingxing Chen Jing Ju Fangtian You Key Laboratory of Luminescence and Optical Information Ministry of Education Institute of Optoelectronic Technology Beijing Jiaotong University Beijing National Laboratory for molecular Sciences (BNLMS) College of Chemistry and Molecular Engineering Peking University

Lead-halide perovskite nanoparticles（LHP NPs） are highly promising materials for next-generation displays and solid-state lighting due to their exceptional optical properties. However, their inherent instability presents a significant challenge. Recent advances have demonstrated that optoelectronic devices based on monolayer nanoparticle films exhibit both high luminescence efficiency and long-term *** research demonstrates that mobility limitations and anisotropic alignments in CsPbBr3nanocube monolayer films are key to their stabilization, hindering spontaneous growth through face-to-face fusion and resulting in the formation of connecting necks in a diagonal direction. Introducing laser irradiation confirmed this by significantly accelerating nanocubes growth, increasing mobility, and enhancing local structural ordering, leading to larger and more regularly shaped nanosheets. Fourier transform infrared spectroscopy and energy dispersive spectroscopy line-scan analyses indicated that laser irradiation did not disrupt the ligand structure. Transmission electron microscopy and correlative cathodoluminescence electron microscopy revealed the effects of post-growth and heterogeneous structures, including enhanced luminescence and inhomogeneous intensity in the nanosheets. These findings deepen the understanding of the post-growth mechanism of monolayer nanoparticles and the structure-emission correlation and highlight the unique role of laser irradiation in directing the formation of well-defined and regular nanostructures.

关键词： Post-growth mechanism Heterogeneous structure Single-particle spectroscopy Laser irradiation

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Double [5]carbohelicene: facile synthesis, chiroptical properties,isomerization study, and lasing application

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Science China Chemistry 2025年第1期 233-240页

作者： Peipei Liu Yantong Li Meng-Xiang Wu Hao Kang Xiao-Li Zhao Lin Xu Linlin Liu Xiaodong Li Junfeng Fang Zhiwei Fang Ya Cheng Hai-Bo Yang Huakang Yu Xueliang Shi State Key Laboratory of Petroleum molecular & Process Engineering Shanghai Key Laboratory of Green Chemistry and Chemical ProcessesSchool of Chemistry and Molecular Engineering East China Normal University School of Physics and Optoelectronics South China University of Technology Institute of Polymer Optoelectronic Materials & Devices State Key Laboratory of Luminescent Materials & Devices South China University of Technology School of Physics and Electronic Science Engineering Research Center of Nanophotonics & Advanced Instrument Ministry of EducationEast China Normal University State Key Laboratory of Precision spectroscopy School of Physics and Electronic Science East China Normal University

Double carbohelicenes have attracted considerable attention due to their aesthetic structures, distinct π-conjugation extension, inherent chirality, and intriguing optical and electronic properties. Herein, the concise de novo synthesis of a new double[5]carbohelicene 1 together with its chiroptical properties, isomerization process and lasing application is presented. 1 was synthesized by a simple protocol involving the formation of a 6,6′-bipentacene as the key intermediate. It is worth noting that1 existed as two diastereomers 1-PP/MM and 1-PM, which were successfully isolated and unambiguously confirmed by Xray crystallography. The optical resolution of the racemic 1-PP/MM was successfully achieved by chiral-phase highperformance liquid chromatography（HPLC）, and 1-PP and 1-MM were characterized by circular dichroism. Interestingly, it was found that 1-PP/MM could be completely isomerized to 1-PM upon heating, and the detailed thermodynamics and kinetics of the isomerization process were systematically investigated. 1-PM exhibited deep-red luminescence with emission maximum at 723 nm and fluorescence quantum yield as high as 32.95%. Consequently, we can showcase the lasing application of 1-PM by doping with epoxy resin to assemble a bottle microlaser spontaneously, which the lasing wavelength is 796.6 nm at a threshold of 0.8 m J cm-2. We believe that our studies, including the facile synthesis methodology, detailed isomerization studies, and lasing application, will shed some light on the design and synthesis of novel carbohelical systems with more functions.

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Phosphodiesterase 9 localization in cytoplasm and nucleus:the gateway to selective targeting in neuroprotection?

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Neural Regeneration Research 2025年第6期20卷 1701-1702页

作者： Giovanni Ribaudo Matteo Giannangeli Margrate Anyanwu Alessandra Gianoncelli Department of molecular and Translational Medicine University of BresciaBresciaItaly

The umbrella term"neurodege ne rative disorders"(NDDs) refers to several conditions characterized by a progressive loss of structure and function of cells belonging to the nervous *** diseases affect more than 50million people *** disorders are characterized by sundry factors and pathophysiological mechanisms that a re challenging to be fully *** of these rely on cell signaling pathways to preserve homeostasis,involving second messengers such as cyclic adenosine monophosphate (cAMP)and cyclic guanosine 3',5'-monophosphate(cGMP).Their ability to control the duration and amplitude of the signaling cascade is given by the presence of several common and uncommon *** kinases A and G (PKA and PKG),phosphodiesterases (PDEs),and scaffold proteins are among them.

关键词： gateway homeostasis preserve

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TiO_2 composite electron transport layers for planar perovskite solar cells by mixed spray pyrolysis with precursor solution incorporating TiO_2 nanoparticles

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Chinese Physics B 2018年第1期27卷 121-126页

作者：田嘉琪李红翠王海月郑博薛叶斌刘喜哲 Institute of Atomic and molecular Physics Jilin Provincial Key Laboratory of Applied Atomic and Molecular SpectroscopyJilin University

Perovskite solar cells with planar structure are attractive for their simplified device structure and reduced hysteresis effect. Compared to conventional mesoporous devices, TiO2 porous scaffold layers are removed in planar devices. Then, compact TiO2 electron transport layers take the functions of extracting electrons, transporting electrons, and blocking holes. Therefore, the properties of these compact TiO2 layers are important for the performance of solar cells. In this work, we develop a mixed spray pyrolysis method for producing compact TiO2 layers by incorporating TiO2 nanoparticles with dif- ferent size into the precursor solutions. For the optimized nanoparticle size of 60 nm, a power conversion efficiency of 16.7% is achieved, which is obviously higher than that of devices without incorporated nanoparticles （9.9%）. Further in- vestigation reveals that the incorporation of nanoparticles can remarkably improve the charge extraction and recombination processes.

关键词： perovskite solar cell electron transport layer charge extraction recombination

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Accurate all-electron calculation on the vibrational and rotational spectra of ground states for O2 and its ions

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Chinese Physics B 2019年第7期28卷 193-197页

作者： Qiao-Xia Wang Yu-Min Wang Ri Ma Bing Yan Key Laboratory of Applied Atomic and molecular spectroscopy Jilin Province Institution of Atomic and Molecular PhysicsJilin University

The potential energy curves, spectroscopic constants, and low-lying vibration–rotation levels of ground-state O2 and its cation O2+ and anion O2- were calculated with the explicitly correlated multireference configuration interaction *** zeroth-order reference wavefunction was treated with the complete active space multiconfigurational self-consistent field method, in which the active space was carefully selected, and an additional molecular orbital πu was added into the full valence active *** electron correlation of the 1s core in the oxygen atom was considered in the *** Davidson correction on molecular energy was considered to account for higher electron *** relativistic effects, including the scalar relativistic effect and spin–orbit coupling, were considered in the computation of potential energy *** physical effects on the spectroscopic constants were *** low-lying levels of vibration–rotation spectra of O2 and its ions were determined based on the computed potential energy *** with available experiments were made and excellent agreement was obtained for the vibrational and rotational *** spectroscopic constants and vibration–rotation spectrum of O2-, which is sparse in experiments, were *** study will shed some light on further theoretical and experimental studies on these simple but important molecular systems.

关键词： O2 molecule/molecular ion explicitly correlated multireference configuration interaction spectroscopic constant vibration–rotation spectrum

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Magnetism and piezoelectricity of hexagonal boron nitride with triangular vacancy

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Chinese Physics B 2018年第1期27卷 450-455页

作者：赵路丝陈春平刘林林于洪侠陈怡王晓春 Institute of Atomic and molecular Physics Jilin University Jilin Provincial Key Laboratory of Applied Atomic and molecular spectroscopy (Jilin University)

First-principle calculations reveal that the configuration system of hexagonal boron nitride （h-BN） monolayer with triangular vacancy can induce obvious magnetism, contrary to that of the nonmagnetic pristine boron nitride monolayer. Interestingly, the h-BN with boron atom vacancy （VB-BN） displays metallic behavior with a total magetic moment being 0.46μB per cell, while the h-BN with nitrogen atom vacancy （VN-BN） presents a half-metallic characteristic with a total magnetic moment being 1.0μB per cell. Remarkably, piezoelectric stress coefficient ell of the VN-BN is about 1.5 times larger than that of pristine h-BN. Furthermore, piezoelectric strain coefficient dll （12.42 μm/V） of the VN-BN is 20 times larger than that of pristine h-BN and also one order of magnitude larger than the value for the h-MoS2 monolayer, which is mainly due to the spin-down electronic state in the VN-BN system. Our study demonstrates that the nitrogen atom vacancies can be an efficient route to tailoring the magnetic and piezoelectric properties of h-BN monolayer, which have promising performances for potential applications in nano-electromechanical systems （NEMS） and nanoscale electronics devices.

关键词： first-principle magnetism piezoelectric nano-electromechanical systems

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Low-lying electronic states of aluminum monoiodide

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Chinese Physics B 2019年第4期28卷 150-156页

作者： Xiang Yuan Shuang Yin Yi Lian Pei-Yuan Yan Hai-Feng Xu Bing Yan Jilin Provincial Key Laboratory of Applied Atomic and molecular spectroscopy (Jilin University) Institute of Atomic and Molecular PhysicsJilin University

High-level ab initio calculations of aluminum monoiodide(AlI) molecule are performed by utilizing the multireference configuration interaction plus Davidson correction(MRCI+Q) method. The core-valence correlation(CV) and spin–orbit coupling(SOC) effect are considered. The adiabatic potential energy curves(PECs) of a total of 13 Λ–S states and 24 ? states are computed. The spectroscopic constants of bound states are determined, which are in accordance with the results of the available experimental and theoretical studies. The interactions between the Λ–S states are analyzed with the aid of the spin–orbit matrix elements. Finally, the transition properties including transition dipole moment(TDM),Frank–Condon factors(FCF) and radiative lifetime are obtained based on the computed PEC. Our study sheds light on the electronic structure and spectroscopy of low-lying electronic states of the AlI molecule.

关键词： AlI molecule potential energy curves(PECs) core-valence correlation spin–orbit coupling multi-reference configuration interaction(MRCI)

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molecular dynamics simulation of structural change at metal/semiconductor interface induced by nanoindenter

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Chinese Physics B 2016年第11期25卷 353-359页

作者：赵兵兵王影刘畅王晓春 Institute of Atomic and molecular Physics Jilin University Jilin Provincial Key Laboratory of Applied Atomic and molecular spectroscopy Jilin University

The structures of the Si/Cu heterogenous interface impacted by a nanoindenter with different incident angles and depths are investigated in detail using molecular dynamics *** simulation results suggest that for certain incident angles,the nanoindenter with increasing depth can firstly increase the stress of each atom at the interface and it then introduces more serious structural deformation of the Si/Cu heterogenous interface.A nanoindenter with increasing incident angle（absolute value） can increase the length of the Si or Cu extended atom *** is worth mentioning that when the incident angle of the nanoindenter is between-45° and 45°,these Si or Cu atoms near the nanoindenter reach a stable state,which has a lower stress and a shorter length of the Si or Cu extended atom layer than those of the other incident *** may give a direction to the planarizing process of very large scale integration circuits manufacture.

关键词： incident manufacture absolute impacted depths length dislocation neighbor struction frictional

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Ultrafast dynamical process of Ge irradiated by the femtosecond laser pulses

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High Power Laser Science and Engineering 2016年第2期4卷 5-13页

作者： Fangjian Zhang Shuchang Li Anmin Chen Yuanfei Jiang Suyu Li Mingxing Jin Institute of Atomic and molecular Physics Jilin University Jilin Provincial Key Laboratory of Applied Atomic and molecular spectroscopy(Jilin University)

The ultrafast dynamic process in semiconductor Ge irradiated by the femtosecond laser pulses is numerically simulated on the basis of van Driel system. It is found that with the increase of depth, the carrier density and lattice temperature decrease, while the carrier temperature first increases and then drops. The laser fluence has a great influence on the ultrafast dynamical process in Ge. As the laser fluence remains a constant value, though the overall evolution of the carrier density and lattice temperature is almost independent of pulse duration and laser intensity, increasing the laser intensity will be more effective than increasing the pulse duration in the generation of carriers. Irradiating the Ge sample by the femtosecond double pulses, the ultrafast dynamical process of semiconductor can be affected by the temporal interval between the double pulses.

关键词： carrier energy transfer femtosecond laser lattice semiconductor

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Nitrogen fluorescence induced by the femtosecond intense laser pulses in air

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High Power Laser Science and Engineering 2016年第1期4卷 45-51页

作者： He Li Suyu Li Shuchang Li Dunli Liu Dan Tian Anmin Chen Ying Wang Xiaowei Wang Yunfeng Zhang Mingxing Jin Institute of Atomic and molecular Physics Jilin University Jilin Provincial Key Laboratory of Applied Atomic and molecular spectroscopy (Jilin University)

Our experiments show that external focusing and initial laser energy strongly influences filament generated by the femtosecond Ti–sapphire laser in air. The experimental measurements show the filament length can be extended both by increasing the laser energy and focal length of focusing lens. On the other hand, the plasma fluorescence emission can be enhanced by increasing the laser energy with fixed focal length or decreasing the focal length. In addition, the collapse distance measured experimentally are larger than the calculated ones owing to the group-velocity-dispersion effect. In addition, we find that the line widths of the spectral lines from N2 is independent of filament positions, laser energies and external focusing.

关键词： femtosecond laser filament fluorescence

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