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A Model on the Mn^2＋ Luminescence Band Redshift with Mn（Ⅱ） Doping and Aggregation within CdS＇Mn Microwires ＊

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Chinese Physics Letters 2014年第6期31卷 215-218页

作者： MUHAMMAD Arshad Kamran 张用友刘瑞斌石丽洁邹炳锁 Beijing Key lab of nanophotonics and Ultrafine Optoeletronic Systems Beijing Institute of Technology Beijing 100081

We report the microphoto-luminescence band redshifts with individual and multi-Mn（Ⅱ） ion emissions within CdS microwires. The localized exciton magnetic polaxons （LEMPs） corresponding to the d-d optical transitions of Mn（Ⅱ） account for this shift. This LEMP emission from the double-, three- and four-Mn（Ⅱ） ions with ferromag- netic coupling after photoexeitation can happen in diluted magnetic semiconductors, except for the individual Mn（Ⅱ） doping. In addition, a simple spin-exchange polaronic model is established to account for these emission peaks well. Through this model, we can verify the local geometry of the Mn（Ⅱ） ions in CdS microwires.

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Kirigami/origami:unfolding the new regime of advanced 3D microfabrication/nanofabrication with“folding”

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Light(Science & Applications) 2020年第1期9卷 1309-1327页

作者： Shanshan Chen Jianfeng Chen Xiangdong Zhang Zhi-Yuan Li Jiafang Li Key lab of Advanced Optoelectronic Quantum Architecture and Measurement(Ministry of Education) Beijing Key Lab of Nanophotonics&Ultrafine Optoelectronic Systemsand School of PhysicsBeijing Institute of Technology100081 BeijingChina College of Physics and Optoelectronics South China University of Technology510640 GuangzhouChina

Advanced kirigami/origami provides an automated technique for modulating the mechanical,electrical,magnetic and optical properties of existing materials,with remarkable flexibility,diversity,functionality,generality,and reconfigurability.In this paper,we review the latest progress in kirigami/origami on the microscale/nanoscale as a new platform for advanced 3D microfabrication/nanofabrication.Various stimuli of kirigami/origami,including capillary forces,residual stress,mechanical stress,responsive forces,and focussed-ion-beam irradiation-induced stress,are introduced in the microscale/nanoscale region.These stimuli enable direct 2D-to-3D transformations through folding,bending,and twisting of microstructures/nanostructures,with which the occupied spatial volume can vary by several orders of magnitude compared to the 2D precursors.As an instant and direct method,ion-beam irradiation-based tree-type and close-loop nano-kirigami is highlighted in particular.The progress in microscale/nanoscale kirigami/origami for reshaping the emerging 2D materials,as well as the potential for biological,optical and reconfigurable applications,is briefly discussed.With the unprecedented physical characteristics and applicable functionalities generated by kirigami/origami,a wide range of applications in the fields of optics,physics,biology,chemistry and engineering can be envisioned.

关键词： regime folding enable

Influence of the Post-Synthesis Thermal Annealing Treatment on Device Performance for PbS Quantum Dot Solar Cells

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Influence of the Post-Synthesis Thermal Annealing Treatment ...

Nonlinear optical trapping effect with reverse saturable absorption

第三届新型太阳能电池学术研讨会

作者： Haowei Wang Shengyi Yang Beijing Key lab of nanophotonics and Ultrafine Optoelectronic Systems Beijing Institute of Technology

Solution-processed organic,inorganic and hybrid ligand-exchange technologies have been widely used in CQDs-based solar cells to improve the power conversion efficiency(PCE).Thermal annealing has been proven to be an effective way to increase the electrical conductivity of CQDs arrays[1]for the reduction of the CQDs interspace.The ability of CQDs to fuse[2] at relatively modest temperatures provides a low-temperature route to thin CQDs film growth.In this work,we present the thermal treatment effect on the device performance of a typical heterojunction solar cells(ITO/ZnO/Pb S/Au).By changing the annealing temperatures during the post-synthesis processes,we found its PCE increased from 3.26 % to 4.52 % after annealing at 140 ℃,showing a 38.6% enhancement due to a dramatic enhancement of short circuit-current density(JSC) but a slight decrement of open-circuit voltage(VOC)

关键词： PbS Quantum Dot Solar Cells Thermal Annealing Treatment

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Advanced Photonics 2023年第4期5卷 66-73页

作者： Zheng Zhu Yuquan Zhang Shuoshuo Zhang Aurele J.L.Adam Changjun Min Hendrik Paul Urbach Xiaocong Yuan Shenzhen University Institute of Microscale Optoelectronics and State Key Laboratory of Radio Frequency Heterogeneous IntegrationNanophotonics Research CenterShenzhenChina Research Institute of Intelligent Sensing Research Center for Humanoid SensingZhejiang LabHangzhouChina Delft University of Technology Optics Research GroupDelftThe Netherlands

Nonlinear responses of nanoparticles induce enlightening phenomena in optical tweezers. With thegradual increase in optical intensity, effects from saturable absorption (SA) and reverse SA (RSA) arise insequence and thereby modulate the nonlinear properties of materials. In current nonlinear optical traps,however, the underlying physical mechanism is mainly confined within the SA regime because thresholdvalues required to excite the RSA regime are extremely high. Herein, we demonstrate, both in theory andexperiment, nonlinear optical tweezing within the RSA regime, proving that a fascinating composite trappingstate is achievable at ultrahigh intensities through an optical force reversal induced through nonlinearabsorption. Integrated results help in perfecting the nonlinear optical trapping system, thereby providingbeneficial guidance for wider applications of nonlinear optics.

关键词： nonlinear optical tweezers optical force reverse saturable absorption

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Transferrable and flexible organic solar cells devices based on WO3/Ag/WO3 transparent electrode

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Transferrable and flexible organic solar cells devices based...

Three-primary-color molecular cocrystals showing white-light luminescence,tunable optical waveguide and ultrahigh polarized emission

第三届新型太阳能电池学术研讨会

作者： Yishan Wang Shengyi Yang Beijing Key lab of nanophotonics and Ultrafine Optoelectronic Systems School of PhysicsBeijing Institute of Technology

We investigated the high-performance WO/Ag/WO(WAW) transparent electrode for transferrable and flexible organic solar cells(OSCs).By carefully optimizing Ag film thickness,a WO/Ag/WO multilayer transparent electrode have the best results were obtained for the thermally evaporated WO(25 nm)/Ag(13 nm)/WO(25 nm) structure,a high transmittance of 1.4 % and a low sheet resistance about 2 Ω/sq were obtained.Employing WAW electrode,transferrable OSCs devices are fabricated,and with help of a polyacrylonitrile(PAN) protective layer,the devices can be smartly separated and transferred onto other substrates while maintaining their performances well.We anticipate that the sandwich-structured WO/Ag/WO transparent electrode can be a promising material to play a great role in realization of emerging transferrable OCSs devices.

关键词： WAW transparent electrodes organic solar cells（OSCs） transferable devices

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Science China Chemistry 2022年第2期65卷 408-417页

作者： Shuzhen Li Yan Hao Shuai Guo Chunjie Ding Yujuan Ma Ruibin Liu Dongpeng Yan Beijing Key laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing 100875China Beijing Key lab of nanophotonics and Ultrafine Optoelectronic Systems School of PhysicsBeijing Institute of TechnologyBeijing 100081China College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou 450001China

Three-primary-color luminescent materials are highly desirable to construct white-light emitting resource,multi-color optical displays,and tunable photonic applications.However,the efficient strategy to establish the three-primary-color systems with unique photofunctionalities is still rather limited,particularly for molecular materials.Herein,we developed a molecular cocrystal route to obtain three-primary-color emissive materials by tuning different donor-acceptor units based on the same chromophore(4,4′-bis(2,5-dimethylstyryl)biphenyl,Bdb).The warm and cold white-light together with multi-color emission in most of visible region can be highly adjusted by rationally tuning different mixture components of three-primary-color cocrystals through an energy transfer mechanism.Furthermore,the blue/green/red emitters endow Bdb molecular cocrystals novel colortunable photonic properties(such as one-dimensional(1D)/2D optical waveguide,polarized fluorescence,up-conversion luminescence,and amplified spontaneous emission),benefitting from their well-defined micro/nanostructures and high crystallinity.Particularly,the high luminescence quantum yield(82.49%)and polarized anisotropy(0.723)outperform most of state-ofthe-art molecular crystalline materials.Therefore,this work supplies an effective way to fabricate new types of three-primarycolor phosphors through luminescent cocrystals,which have promising applications in the fields of full-color displays,whitelight irradiation,low-dimensional optical polarization,and micro/nanophotonics.

关键词： three-primary-color emission molecular crystal white light optical waveguide polarized luminescence

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On-chip wireless silicon photonics: from reconfigurable interconnects to lab-on-chip devices

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Light(Science & Applications) 2017年第1期6卷 517-527页

作者： Carlos García-Meca Sergio Lechago Antoine Brimont Amadeu Griol Sara Mas Luis Sánchez Laurent Bellieres Nuria S Losilla Javier Martí nanophotonics Technology Center Universitat Politècnica de València46022 ValenciaSpain

Photonic integrated circuits are developing as key enabling components for high-performance computing and advanced networkon-chip,as well as other emerging technologies such as lab-on-chip sensors,with relevant applications in areas from medicine and biotechnology to aerospace.These demanding applications will require novel features,such as dynamically reconfigurable light pathways,obtained by properly harnessing on-chip optical radiation.In this paper,we introduce a broadband,high directivity(4150),low loss and reconfigurable silicon photonics nanoantenna that fully enables on-chip radiation control.We propose the use of these nanoantennas as versatile building blocks to develop wireless(unguided)silicon photonic devices,which considerably enhance the range of achievable integrated photonic functionalities.As examples of applications,we demonstrate 160 Gbit s−1 data transmission over mm-scale wireless interconnects,a compact low-crosstalk 12-port crossing and electrically reconfigurable pathways via optical beam steering.Moreover,the realization of a flow micro-cytometer for particle characterization demonstrates the smart system integration potential of our approach as lab-on-chip devices.

关键词： integrated optics lab-on-a-chip devices nanoantenna sensing silicon photonics

Recent progress in the synthesis of novel two-dimensional van der Waals materials

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National Science Review 2022年第5期9卷 57-76页

作者： Renji Bian Changcun Li Qing Liu Guiming Cao Qundong Fu Peng Meng Jiadong Zhou Fucai Liu Zheng Liu School of Optoelectronic Science and Engineering University of Electronic Science and Technology of China School of Electrical and Electronic Engineering Nanyang Technological University CNRS-International-NTU-Thales Research Alliance (CINTRA) Yangtze Delta Region Institute (Huzhou) University of Electronic Science and Technology of China Key lab of Advanced Optoelectronic Quantum Architecture and Measurement(Ministry of Education) Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems and School of Physics Beijing Institute of Technology School of Materials Science and Engineering Nanyang Technological University

The last decade has witnessed the significant progress of physical fundamental research and great success of practical application in two-dimensional(2D) van der Waals(vdW) materials since the discovery of graphene in 2004.To date,vdW materials is still a vibrant and fast-expanding field,where tremendous reports have been published covering topics from cutting-edge quantum technology to urgent green energy,and so on.Here,we briefly review the emerging hot physical topics and intriguing materials,such as 2D topological materials,piezoelectric materials,ferroelectric materials,magnetic materials and twistronic heterostructures.Then,various vdW material synthetic strategies are discussed in detail,concerning the growth mechanisms,preparation conditions and typical examples.Finally,prospects and further opportunities in the booming field of 2D materials are addressed.

关键词： two-dimensional materials synthesis exfoliation chemical vapor deposition

Mesoporous polymers:soft-template self-assembly synthesis and applications

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Science China Chemistry 2024年第5期67卷 1442-1464页

作者： Facai Wei Tingting Zhang Jianwei Fu Chengbin Jing Jiangong Cheng Shaohua Liu State Key laboratory of Precision Spectroscopy Engineering Research Center of Nanophotonics&Advanced Instrument(Ministry of Education)School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450052China State Key lab of Transducer Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China

Mesoporous polymers combine the advantages of polymer materials(abundant polar functional groups,lightweight,flexibility,and processability)and mesoporous structures(high specific surface area,adjustable pore structure,and large pore volume);hence,they have great application potential in sensing,adsorption,catalysis,energy storage,biomedicine,etc.Currently,developing advanced synthetic strategies for mesoporous polymers and investigating their intrinsic applications have become hot research topics.Soft-template-based self-assembly is regarded as a promising approach for synthesizing mesoporous polymers.This work reviews recent progress in the synthetic strategy for producing various mesoporous polymers using soft-template selfassembly,focusing on the synthesis of conductive polymers,phenol-based polymers,and resin-based polymers and their potential applications.Finally,perspectives on future applications of mesoporous polymers,along with a few challenges that need to be resolved,are also discussed in this review.

关键词： mesoporous polymer porous material self-assembly soft templates interface synthesis

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