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Passivation of degradation path enables high performance perovskite nanoplatelet lasers with high operational stability

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Photonics Research 2022年第6期10卷 1440-1452页

作者： GUOHUI LI HUIHUI PI YANFU WEI BOLIN ZHOU YA GAO RONG WEN YUYING HAO HAN ZHANG BENG S.ONG YANXIA CUI college of Physics and optoelectronics Key Laboratory of Interface Science and Engineering in Advanced MaterialsKey Laboratory of Advanced Transducers and Intelligent Control System of Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China Collaborative Innovation Centre for optoelectronic Science and Technology Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen Key Laboratory of Micro-Nano Photonic Information TechnologyGuangdong Laboratory of Artificial Intelligence and Digital Economy(SZ)Shenzhen UniversityShenzhen 518060China Department of Chemistry Research Centre of Excellence for Organic ElectronicsInstitute of Advanced MaterialsHong Kong Baptist UniversityKowloon TongHong KongChina

MAPbI_(3)perovskite has attracted widespread interests for developing low-cost near infrared semiconductor gain ***,it faces the instability issue under operation conditions,which remains a critical *** is found that the instability of the MAPbI_(3)nanoplatelet laser comes from the thermal-induced degradation progressing from the surface defects towards neighboring *** using PbI_(2) passivation,the defect-initiated degradation is significantly suppressed and the nanoplatelet degrades in a layer-by-layer way,enabling the MAPbI_(3)laser to sustain for 4500 s(2.7×10^(7) pulses),which is nearly three times longer than that of the nanoplatelet laser without ***,the PbI_(2) passivated MAPbI_(3)nanoplatelet laser with the nanoplatelet cavity displays a maximum quality factor up to∼7800,the highest reported for all MAPbI_(3)nanoplatelet ***,a high stability MAPbI_(3)nanoplatelet laser that can last for 8500 s(5.1×10^(7) pulses)is demonstrated based on a dual passivation strategy,by retarding the defect-initiated degradation and surface-initiated degradation *** work provides in-depth insights for understanding the operating degradation of perovskite lasers,and the dual passivation strategy paves the way for developing high stability near infrared semiconductor laser media.

关键词： stability initiated high

Halogen-doped phosphorescent carbon dots for grayscale patterning

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Light(Science & Applications) 2022年第7期11卷 1464-1474页

作者： Yanfeng Liu Mahmoud Al-salihi Yong Guo Roman Ziniuk Songtao Cai Luwei Wang Yuan Li Zhigang Yang Dengfeng Peng Kai Xi Zhongfu An Xudong Jia Liwei Liu Wei Yan Junle Qu Center for Biomedical Photonics and college of Physics and optoelectronic engineering Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceShenzhen UniversityShenzhen 518060China School of Chemistry and Chemical engineering Nanjing University163 Xianlin RoadNanjing 210023China key laboratory of Flexible Electronics(KLOFE)and Institute of Advanced Materials(IAM) Nanjing Tech University(NanjingTech)30 South Puzhu RoadNanjing 211816China

Flexible organic materials that exhibit dynamic ultralong room temperature phosphorescence(DURTP)via photoactivation have attracted increasing research interest for their fascinating functions of reversibly writing-reading-erasing graphic information in the form of a long ***,due to the existence of a nonnegligible activation threshold for the initial exposure dose,the display mode of these materials has thus far been limited to binary *** resorting to halogen element doping of carbon dots(CDs)to enhance intersystem crossing and reduce the activation threshold,we were able to produce,for the first time,a transparent,flexible,and fully programmable DURTP composite film with a reliable grayscale display *** of promising applications in UV photography and highly confidential steganography were constructed,partially demonstrating the broad future applications of this material as a programmable platform with a high optical information density.

关键词： activation resort negligible

Low-temperature optothermal nanotweezers

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Nano Research 2023年第5期16卷 7710-7715页

作者： Jianxing Zhou Xiaoqi Dai Yuhang Peng Yili Zhong Ho-Pui Ho Yonghong Shao Bruce Zhi Gao Junle Qu Jiajie Chen State key laboratory of Radio Frequency Heterogeneous Integration Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronics EngineeringShenzhen UniversityShenzhen 518060China Department of Biomedical engineering The Chinese University of Hong KongHong Kong 999077China Department of Bioengineering and COMSET Clemson UniversityClemsonSC 29634USA

Optical tweezers that rely on laser irradiation to capture and manipulate nanoparticles have provided powerful tools for biological and biochemistry ***,the existence of optical diffraction-limit and the thermal damage caused by high laser power hinder the wider application of optical tweezers in the biological *** the past decade,the emergence of optothermal tweezers has solved the above problems to a certain extent,while the auxiliary agents used in optothermal tweezers still limit their ***,we report a kind of nanotweezers based on the sign transformation of the thermophoresis coefficient of colloidal particles in low-temperature *** a self-made microfluidic refrigerator to reduce the ambient temperature to around 0℃in the microfluidic cell,we can control a single nanoparticle at lower laser power without adding additional agent solute in the *** novel optical tweezering scheme has provided a new path for the manipulation of inorganic nanoparticles as well as biological particles.

关键词： optothermal tweezers optical manipulation microfluidic device thermophoresis thermo-osmotic flow

A simple and efficient carbon nanotube-based nanocarriers simultaneously delivers multiple plasmids into diverse mature tissues of monocotyledonous crops

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Science China(Life Sciences) 2023年第7期66卷 1701-1704页

作者： Xuedong Liu Wenwen Kong Nian Xiao Lijuan Huang Yu Zhang Weizhao Chen Beixin Mo Yu Yu guangdong Provincial key laboratory for Plant Epigenetics Longhua Bioindustry and Innovation Research InstituteCollege of Life Sciences and OceanographyShenzhen UniversityShenzhen518060China key laboratory of optoelectronic devices and systems of ministry of education and guangdong province College of Optoelectronic EngineeringShenzhen UniversityShenzhen518060China Instrumental Analysis Center of shenzhen university(Lihu Campus) Shenzhen UniversityShenzhen518060China

Dear Editor,With the development of high-throughput sequencing technology,a large number of functional genes have been ***,the illustration of these gene functions is limited,especially in monocot plants(Chen et al.,2022).One of the main reasons is that genetic transformation is still a major bottleneck for these ***,nanoparticles(NPs)-mediated biomolecular delivery methods.

关键词： mono illustration crops

Simple phase extraction in x-ray differential phase contrast imaging

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Chinese Physics B 2016年第2期25卷 563-567页

作者：刘鑫郭金川雷耀虎李冀牛憨笨 key laboratory of optoelectronic devices and systems of ministry of education and guangdong province College of Optoelectronic Engineering Shenzhen University

A fast and simple method to extract phase-contrast images from interferograms is proposed, and its effectiveness is demonstrated through simulation and experiment. For x-ray differential phase contrast imaging, a strong attenuation signal acts as an overwhelming background intensity that obscures the weak phase signal so that no obvious phase-gradient information is detectable in the raw image. By subtracting one interferogram from another, chosen at particular intervals,the phase signal can be isolated and magnified.

关键词： x-ray imaging x-ray interferometry Talbot and self-imaging effects phase contrast imaging

CRISPR-powered optothermal nanotweezers:Diverse bio-nanoparticle manipulation and single nucleotide identification

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Light(Science & Applications) 2023年第12期12卷 2644-2654页

作者： Jiajie Chen Zhi Chen Changle Meng Jianxing Zhou Yuhang Peng Xiaoqi Dai Jingfeng Li Yili Zhong Xiaolin Chen Wu Yuan Ho-Pui Ho Bruce Zhi Gao Junle Qu Xueji Zhang Han Zhang Yonghong Shao State key laboratory of Radio Frequency Heterogeneous Integration Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronics EngineeringShenzhen UniversityShenzhen 518060China Department of Biomedical engineering The Chinese University of Hong KongShatinHong KongChina Department of Bioengineering and COMSET Clemson UniversityClemsonSC 29634USA School of Biomedical engineering Shenzhen UniversityShenzhenGuangdong 518060China

Optothermal nanotweezers have emerged as an innovative optical manipulation technique in the past decade,which revolutionized classical optical manipulation by efficiently capturing a broader range of ***,the optothermal temperature field was merely employed for in-situ manipulation of nanoparticles,its potential for identifying bio-nanoparticles remains largely ***,based on the synergistic effect of optothermal manipulation and CRIPSR-based bio-detection,we developed CRISPR-powered optothermal nanotweezers(CRONT).Specifically,by harnessing diffusiophoresis and thermo-osmotic flows near the substrate upon optothermal excitation,we successfully trapped and enriched DNA functionalized gold nanoparticles,CRISPR-associated proteins,as well as DNA ***,we built an optothermal scheme for enhancing CRISPR-based single-nucleotide polymorphism(SNP)detection at single molecule level,while also introducing a novel CRISPR methodology for observing nucleotide ***,this innovative approach has endowed optical tweezers with DNA identification ability in aqueous solution which was unattainable *** its high specificity and feasibility for in-situ bio-nanoparticle manipulation and identification,CRONT will become a universal tool in point-of-care diagnosis,biophotonics,and bio-nanotechnology.

关键词： manipulation thermal identification

Effect of Y:Zn ratio on microstructure and emission of Er^(3+)/Yb^(3+) codoped Y_(2)O_(3)-ZnO ceramic phosphors

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Journal of Rare Earths 2023年第12期41卷 1883-1894,I0003页

作者： Boxu Xu Chao Song Jie Song Rui Huang Shaomin Lin Zhenxu Lin Yi Zhang Dejian Hou Jun Song School of Materials Science and engineering Hanshan Normal UniversityChaozhou521041China key laboratory of optoelectronic devices and systemsof ministryofeducation and guangdong province College of Optoelectronic EngineeringShenzhen UniversityShenzhen518060China State key laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China

In this study,Er^(3+)/Yb^(3+)codoped Y_(2)O_(3)-ZnO ceramic phosphors were prepared by sol-gel *** samples had two emission bands,namely,green(535 nm) and red(660 nm),which are attributed to Er^(3+):^(2)H_(11/2)(^(4)S_(3/2))→^(4)I_(15/2)and Er^(3+):^(4)F_(9/2)→^(4)I_(15/2)radiative transitions,*** samples exhibited green-and red-emission intensity enhancement by 1.728 and 2.286 times that of the pure Y2O3host,respectively and by 514.468 and 214.341 times that of the pure ZnO *** emission intensities are first enhanced by lattice *** the change of Y:Zn ratio,the high surface energy is converted into low crystal surface resulting in the change of asymmetry crystal field for *** the intensity of the asymmetric crystal field reaches maximum,both emissions are further *** the high surface energy transforms into crystal surface energy,the microstructure changes into a compact mesoporous ***,the chemical stability of the samples improves significantly,and the final emission band of the three samples with mesoporous structures is continuously red.

关键词： Mesoporous Y_(2)0_(3) Zno Luminescence Rare earths Ceramic phosphors

Large area crystalline Weyl semimetal with nano Au film based micro-fold line array for THz detector

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Science China(Technological Sciences) 2023年第11期66卷 3267-3275页

作者： SONG Qi ZHOU Yu JIA ErSe WANG JiaTong ZHANG Min ZHANG BingYuan Shandong key laboratory of Optical Communication Science and Technology School of Physics Science and Information TechnologyLiaocheng UniversityLiaocheng 252059China North China Institute of Computing Technology Beijing 100083China key laboratory of optoelectronic devices and systems of ministry of education and guangdong province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China School of Precision Instrument and Opto-electronics engineering Tianjin UniversityTianjin 300072China

The advancement of 6G technology relies on the development of high-performance terahertz detectors that can operate at room *** detectors are crucial for Internet of Things(Io T)applications,which require sensitive environmental sensing and efficient reception of 6G *** significant research focus is on detection technology with high responsiveness and low equivalent noise power for 6G signals,which experience high losses in the *** meet the demand for ultra-sensitive detectors in 6G technology,we have employed several ***,we prepared a large area of Weyl-semimetal layer through magnetron ***,we obtained a high-quality Weyl-semimetal active layer by carefully controlling the annealing ***,a thin nano-Au layer was introduced as a micro-cavity reflection layer to enhance the device's detection ***,we incorporated an electromagnetic induction well to improve carrier confinement and enhance the detection *** proposed high-performance terahertz detector,with its potential for industrial production,offers a valuable technical solution for the advancement of 6G technology.

关键词： micro-cavity Weyl semimetal crystalline thin film THz device

Analysis of period and visibility of dual phase grating interferometer

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Chinese Physics B 2022年第5期31卷 749-755页

作者：杨君黄建衡雷耀虎郑景标单雨征郭大育郭金川 key laboratory of optoelectronic devices and systems of ministry of education and guangdong province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China

Dual phase grating interferometer may simultaneously achieve large field of view and high x-ray dose ***,we develop a simple theoretical method to better understand the imaging process of the dual phase grating *** derivation process of fringe period and the optimal visibility conditions of the dual phase grating interferometer are given in ***,we theoretically prove that the fringe period and optimal visibility conditions of the dual phase grating interferometer include that of the Talbot *** comparing our experimental results with those of other researchers,we find that when the positions of phase gratings are far away from the positions where the fringe visibility is optimal,the fringe period of the dualπ-phase grating interferometer is twice the theoretical results under the illumination of polychromatic *** conclusion may explain the contradictory research results of dual phase grating interferometer among different researchers.

关键词： phase contrast grating interferometer fringe period fringe visibility