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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01期 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.

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Mueller matrix analysis for all optical fiber co-existence of birefringence-polarization dependent gain-mode coupling at a single wavelength

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Chinese Physics B 2011年第11期20卷 13-18页

作者：尚超吴重庆李政勇杨双收高凯强余贶琭冯震 key laboratory of Education Ministry on luminescence and optical information technology Institute of Optical InformationBeijing Jiaotong University

Birefringence （polarization-related phase-shift）, polarization dependent gain （PDG） and mode coupling are three factors that may synchronously influence the transmission of single-wavelength polarized light in optical fibers. This paper obtains a new Mueller matrix analysis, which can be used under conditions that all these three factors are existing and changing. According to our transmission model, the state of polarization （SOP） changes along an optical mierostructure fiber with co-existence of birefringence-PDG-mode coupling were simulated. The simulated results, which show the phenomena of SOP constringency, are in good agreement with previous theoretical analyses.

关键词： Mueller matrix birefringence polarization dependent gain mode coupling

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Synthesis and electrochemical properties of three-dimensional graphene/polyaniline composites for supercapacitor electrode materials

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Chinese Physics B 2015年第4期24卷 366-371页

作者：赵文何大伟王永生杜翔忻昊 key laboratory of luminescence and optical information Ministry of Education Institute of Optoelectronic TechnologyBeijing Jiaotong University

To improve the specific capacitance and rate capability of electrode material for supercapacitors, a three-dimensional graphene/polyaniline （3DGN/PANI） composite is prepared via in situ polymerization on GN hydrogel. PANI grows on the GN surface as a thin film, and its content in the composite is controlled by the concentration of the reaction monomer. The specific capacitance of the 3DGN/PANI composite containing 10 wt% PANI reaches 322.8 F.g-1 at a current density of 1 A.g-1, nearly twice as large as that of the pure 3DGN （162.8 F.g-1）. The capacitance of the composite is 307.9 F.g-1 at 30 A.g-1 （maintaining 95.4%）, and 89% retention after 500 cycles. This study demonstrates the exciting potential of 3DGN/PANI with high capacitance, excellent rate capability and long cycling life for supercapacitors.

关键词： graphene/polyaniline composites electrochemical property three-dimensional graphene

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Modulating doping and interface magnetism of epitaxial graphene on SiC(0001)

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Chinese Physics B 2016年第1期25卷 770-776页

作者：周攀何大伟 key laboratory of luminescence and optical information Ministry of Education Institute of Optoelectronic TechnologyBeijing Jiaotong University

On the basis of first principles calculations, we report that the type and density of charge carriers of epitaxial graphene on SiC（O001） can be deliberately controlled by decorating the buffer layer with specific atoms （i.e., F, C1, O, or N）. More importantly, a fine tuning of the doping behavior from intrinsic n-type to charge neutrality to p-type and interface magnetism is achieved via increasing the doping concentration of F atoms on the buffer layer. Our results suggest an interesting avenue to the application of epitaxial graphene in nanoscale electronic and spintronic devices.

关键词： graphene interface magnetism doping SiC

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Performance improvement of MEH-PPV:PCBM solar cells using bathocuproine and bathophenanthroline as the buffer layers

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Chinese Physics B 2011年第6期20卷 540-545页

作者：刘晓东赵谡玲徐征张福俊张天慧龚伟闫光孔超王永生徐叙瑢 key laboratory of luminescence and optical information of Ministry of Education Beijing Jiaotong University

In this work, bathocuproine （BCP） and bathophenanthroline （Bphen）, commonly used in small-molecule organic solar cells （OSCs）, are adopted as the buffer layers to improve the performance of the polymer solar cells （PSCs） based on poly（2-methoxy-5-（2-ethylhexyloxy）-1,4-phenylenevinylene）（MEH-PPV）： [6,6]-phenyl-C61-butyric acid methyl ester （PCBM） bulk heterojunction. By inserting BCP or Bphen between the active layer and the top cathode, all the performance parameters are dramatically improved. The power conversion efficiency is increased by about 70% and 120% with 5-am BCP and 12-nm Bphen layers, respectively, when compared with that of the devices without any buffer layer. The performance enhancement is attributed to BCP or Bphen （i） increasing the optical field, and hence the absorption in the active layer, （ii） effectively blocking the excitons generated in MEH-PPV from quenching at organic/aluminum （Al） interface due to the large band-gap of BCP or Bphen, which results in a significant reduction in series resistance （Rs）, and （iii） preventing damage to the active layer during the metal deposition. Compared with the traditional device using LiF as the buffer layer, the BCP-based devices show a comparable efficiency, while the Bphen-based devices show a much larger efficiency. This is due to the higher electron mobility in Bphen than that in BCP, which facilitates the electron transport and extraction through the buffer layer to the cathode.

关键词： polymer solar cells bathocuproine bathophenanthroline buffer layer

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Experimental Investigation of All-optical NRZ-DPSK to RZ-DPSK Format Conversion Based on TOAD

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Chinese Physics Letters 2015年第11期32卷 56-62页

作者：毛雅亚盛新志吴重庆张天雍王颖 Institute of optical information and Key Lab of Luminescence and Optical Information Technology(Ministry of Education)Beijing Jiaotong University

We propose and experimentally demonstrate a novel all-optical non-return-to-zero differential-phase-shift-keying （NRZ-DPSK） to return-to-zero differentiM-phase-shift-keying （RZ-DPSK） format conversion scheme. This scheme is based on the terahertz optical asymmetric demultiplexer （TOAD）. A 10 Gb/s converted RZ-DPSK signal is obtained with a wide duty cycle tuning range from 16% to 66%. For all converted RZ-DPSK signals, the receiver sensitivities at BER of 10-9 are 0.4 to 1.7dB higher compared with the original NRZ-DPSK signal. The clear and open eye diagrams are presented to demonstrate the high quality format conversion performance. Moreover, the optical spectra show that this conversion is in a wavelength-preserving operation.

关键词： NRZ Experimental Investigation of All-optical NRZ-DPSK to RZ-DPSK Format Conversion Based on TOAD

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optical time-domain differentiation based on intensive differential group delay

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Chinese Physics B 2011年第10期20卷 267-271页

作者：李政勇余向志吴重庆 key laboratory of luminescence and optical information of the Ministry of Education and Institute of optical information Beijing Jiaotong University

An optical time-domain differentiation scheme is proposed and demonstrated based on the intensive differential group delay in a high birefringence fibre waveguide. Results show that the differentiation waveforms agree well with the mathematically calculated derivatives. Both error and efficiency will increase when the birefringence fibre becomes longer, and the error rises up more quickly while the efficiency approaches to a maximum of ~0.25. By using a 1-m birefringence fibre a lower error of ~0.26% is obtained with an efficiency of 1% for the first-order differentiation of 10-ps Gaussian optical pulses, and the high-order optical differentiation up to 4th order is achieved with an error less than 3%. Due to its compact structure being easy to integrate and cascade into photonic circuits, our scheme has great potential for ultrafast signal processing.

关键词： optical signal processing differentiation differential group delay

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Influence of small-molecule material on performance of polymer solar cells based on MEH-PPV:PCBM blend

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Chinese Physics B 2010年第11期19卷 691-697页

作者：刘晓东徐征张福俊赵谡玲张天慧龚伟宋晶路孔超闫光徐叙瑢 key laboratory of luminescence and optical information Beijing Jiaotong UniversityMinistry of Education

In this work, the influence of a small-molecule material, tris（8-hydroxyquinoline） aluminum （Alq3）, on bulk heterojunction （BHJ） polymer solar cells （PSCs） is investigated in devices based on the blend of poly（2-methoxy-5-（2- ethylhexyloxy）-1,4-phenylenevinylene）（MEH-PPV） and [6,6]-phenyl-C61-butyric acid methyl ester （PCBM）. By doping Alq3 into MEH-PPV：PCBM solution, the number of MEH-PPV excitons can be effectively increased due to the energy transfer from Alq3 to MEH-PPV, which probably induces the increase of photocurrent generated by excitons dissociation. However, the low carrier mobility of Alq3 is detrimental to the efficient charge transport, thereby blocking the charge collection by the respective electrodes. The balance between photon absorption and charge transport in the active layer plays a key role in the performance of PSCs. For the case of 5 wt.% Alq3 doping, the device performance is deteriorated rather than improved as compared with that of the undoped device. On the other hand, we adopt Alq3 as a buffer layer instead of commonly used LiF. All the photovoltaic parameters are improved, yielding an 80% increase in power conversion efficiency （PCE） at the optimum thickness （1 nm） as compared with that of the device without any buffer layer. Even for the 5 wt.% Alq3 doped device, the PCE has a slight enhancement compared with that of the standard device after modification with 1 nm （or 2 nm） thermally evaporated Alq3. The performance deterioration of Alq3-doped devices can be explained by the low solubility of Alq3, which probably deteriorates the bicontinuous D-A network morphology; while the performance improvement of the devices with Alq3 as a buffer layer is attributed to the increased light harvesting, as well as blocking the hole leakage from MEH-PPV to the aluminum （Al） electrode due to the lower highest occupied molecular orbital （HOMO） level of Alq3 compared with that of MEH-PPV.

关键词： bulk heterojunction polymer solar cells Alq3 doping buffer layer

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Study of Electroplex Emission from Organic Electroluminescent Devices with Rare Earth Complex

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Journal of Rare Earths 2007年第2期25卷 148-151页

作者：王勇赵谡玲徐征黄金昭袁广才赵德威 key laboratory of luminescence and optical information Ministry of Education Institute of Optoelectronic Technology Beijing Jiaotong University

A novel organic electroluminescent device was made with the structure of ITO/PVK：Tb0.5Eu0.5（TTA）3 Dipy/ BCP/Alq3/Al（a） which utilized the rare earth complex Tb0.5Eu0.5（TTA）3 Dipy as the emitting layer. When it was driven under a direct electric field, 612 nm emission from EU^3＋ and 410 nm emission from PVK were observed. In addition, in the EL spectrum a new peak at 490 nm appeared. From the analysis of different devices, the mechanism of the new emission was studied. It was concluded that the new emission was the electroplex originating from the interface between the ligand （TTA）3Dipy and BCP.

关键词： electroluminescence (EL) ligand electroplex rare earth complex

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Laminated Polymer Solar Cells with PEDOT：PSS Film as Anode

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Chinese Physics Letters 2014年第2期31卷 153-156页

作者：侯腾梁春军张福俊何志群孙凯 key laboratory of luminescence and optical information Institute of Optoelectronic Technology Beijing Jiaotong University Beijing 100044

A prefabricated conductive polymer film of polymer poly（3,4-ethylenedioxy-thiophene）：poly （styrene-sulfonate）（PEDOT：PSS） is developed and is used as the anode in an inverted polymer solar cell （PSC） through a lamination process. The geometry structure of the PSC is indium tin oxide/interface layer/P3HT：PCBM/PEDOT：PSS. The PEDOT：PSS electrode is 5 μm and the sheet resistance is 10Ω/sq. The device fabrication process is vacuum-free and extremely simple. Lithium carbonate （Li2CO3） and cesium carbonate （Cs2C03） are used as the cathode interface layers, respectively, and the result shows that Li2CO3 can enhance the open-circuit voltage （Voc） and fill factor distinctly, and the power conversion efficiency （PCE） can reach 2.1%.

关键词： SOLAR cells LAMINATED plastics POLYMER films GEOMETRIC analysis SURFACE chemistry ENERGY conversion

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