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A novel single-substrate Sr2Ga2SiO7:Tb3+ green phosphor for full-spectrum white LED

Applied Physics A 2025年第6期131卷 1-10页

作者： Liu, Zhifang Wang, Subin Xu, Yingchao Li, Jing Du, Yunxiang Hong, Junhuang Chen, Zhenyu School of Opto-Electronic and Communication Engineering Xiamen University of Technology Xiamen China Fujian Provincial Key Laboratory of Opto-Electronics Technology and Devices Xiamen China

A series of novel silicate green phosphors Sr2-xGa2SiO7: xTb3+ (with x ranging from 0.01 to 0.06) were successfully synthesized by the high-temperature solid-state reaction technique. The samples were analyzed for their phase morphology, luminescent properties, concentration quenching, thermal stability, fluorescence lifetime and CIE chromaticity coordinates. Under the excitation of 370 nm ultraviolet light, the phosphors exhibited strong green emission characteristics. Analysis of the emission spectra of different concentration of samples determined that the optimal doping concentration is x = 0.04, at which the samples exhibit the best luminescent performance. Additionally, these samples demonstrated high thermal stability, at 453 K, the luminous intensity retains 88.3% of its initial value at room temperature. The research results suggest that Sr₂Ga₂SiO₇:Tb3⁺ green phosphors have significant application potential, particularly in addressing the narrow emission spectrum limitations of conventional WLEDs and fluorescence-based marking technologies.

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Atomic N00N state generation in distant cavities by virtual excitations

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Chinese Physics B 2011年第6期20卷 12-18页

作者：杨榕灿李刚李杰张天才 State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-Electronics Shanxi University School of Physics and Opto-Electronics Technology Fujian Normal University

A general scheme of generating NOON states of virtually-excited 2N atoms is proposed. The two cavities are fibre-connected with N atoms in each cavity. Although we focus on the case of N = 2, the system can be extended to a few atoms with N 〉2. It is found that all 2N atoms can be entangled in the form of NOON states if the atoms in the first cavity are initially in the excited states and atoms in the second cavity are all in the ground states. The feasibility of the scheme is carefully discussed, it shows that the NOON state with a few atoms can be generated with good fidelity and the scheme is feasible in experiment.

关键词： N00N states optical cavity optical fibre virtual excitations

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3D hierarchical porous Cr2O3 nanomaterials for high performance dimethyl disulfide gas sensor

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Ceramics International 2025年

作者： Guo, Wen Deng, Zanhong Zhang, Ruofan Klamchuen, Annop Horprathum, Mati Wang, Shimao Fang, Xiaodong You, Libing Meng, Gang Institutes of Physical Science and Information Technology Anhui University Hefei230601 China Anhui Provincial Key Laboratory of Photonic Devices and Materials Anhui Institute of Optics and Fine Mechanics And Key Lab of Photovoltaic and Energy Conservation Materials Chinese Academy of Sciences Hefei230031 China Advanced Laser Technology Laboratory of Anhui Province Hefei230037 China Wan Jiang Emerging Industry Technology Development Center Tongling244000 China National Nanotechnology Center National Science and Technology Development Agency Pathum Thani12120 Thailand Opto-Electrochemical Sensing Research Team Spectroscopic and Sensing Devices Research Group National Electronics and Computer Technology Center Pathum Thani12120 Thailand College of New Materials and New Energies Shenzhen Technology University Shenzhen518118 China Shenzhen Shengfang Technology Company Limited Shenzheng518116 China

Dimethyl disulfide (DMDS) is one of the malodorous gases mandatorily monitored by the government. Developing highly sensitive and selective DMDS sensors based on metal oxide semiconductor (MOS) is an urgent requirement and remains a challenge. In this study, 3D hierarchical mesoporous Cr2O3 nanoparticles were successfully synthesized by a time- and cost-efficient solution combustion synthesis method. The sensing performances of the as-synthesized mesoporous Cr2O3 nanoparticles have been thoroughly investigated. The sensor demonstrated a high response of 102 to 10 ppm DMDS at working temperature of 140 °C, along with satisfactory selectivity and long-term stability, indicating a promising future in DMDS detection. © 2025

关键词： Combustion synthesis

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Quantum Entanglement Dynamics of Two Atoms in Quantum Light Sources

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Communications in Theoretical Physics 2011年第9期56卷 429-434页

作者：杨榕灿李杰王军民张天才 State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi University School of Physics and Opto-Electronics Technology Fujian Normal University

Quantum entanglement dynamics of two Tavis-Cummings atoms interacting with the quantum light sourcesin a cavity is *** results show the phenomenon that the concurrence disappears abruptly in a finite time,which depends on the initial atomic states and the properties of squeezed *** find that there are two decoherencefreestates in squeezed vacuum fields:one is the singlet state,and the other entangled state is the state that combinesboth excited states and ground states with a relative phase being equal to the phase of the squeezed state.

关键词： quantum entanglement dynamics concurrence squeezed vacuum state sudden death

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Quantum Entanglement Dynamics of Two Atoms in Two Coupled Cavities

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Communications in Theoretical Physics 2012年第2期57卷 195-200页

作者：杨榕灿张鹏飞郭龑强张天才 State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi University School of Physics and Opto-Electronics Technology Fujian Normal University

Quantum entanglement dynamics for two atoms trapped in two coupled cavities is *** results show that the present of the two atomic excitations is mainly accounted for the entanglement-sudden-death(ESD) effect with the two cavities initially in the *** entanglement can also be controlled by the hopping rate and the imbalances between the two atom-cavity coupling rates.

关键词： entanglement dynamics entanglement sudden death coupled cavities

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Piezophototronic Effect-Enhanced Highly Sensitive Flexible Photodetectors Based on Electrohydrodynamic Direct-writing Nanofiber Self-stacking

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Advanced Fiber Materials 2025年 1-12页

作者： Du, Xianruo Peng, Zhenghui Liang, Yanyang Zheng, Chenqi Zhong, Yisheng Chen, Ruixin Wang, Yinuo Li, Ziheng Xu, Chunyu Shao, Zungui Liu, Yifang Chen, Huatan Zheng, Gaofeng College of Physical Science and Technology Xiamen University Xiamen China Faculty of Information Science and Engineering Ocean University of China Qingdao China School of Aerospace Engineering Xiamen University Xiamen China School of Informatics Xiamen University Xiamen China Laboratory of Flexible Electronics Technology Tsinghua University Beijing China Pen-Tung Sah Institute of Micro-Nano Science and Technology Xiamen University Xiamen China School of Electronic Science and Engineering Xiamen University Xiamen China Fujian Provincial Key Laboratory of Terahertz Functional Devices and Intelligent Sensing School of Mechanical Engineering and Automation Fuzhou University Fuzhou China School of Mechanical and Automotive Engineering Xiamen University of Technology Xiamen China

Flexible photodetectors are ideal for short-range communication in lightweight microintegrated systems. However, low-bonding interface and high-power cost of photosensitive components greatly limit their application in flexible communication systems. To address this, herein, piezophototronic effect-enhanced sensing components are proposed for flexible photodetectors. This approach leverages the piezophototronic effect to modulate nanoscale charge transport and the precision of electrohydrodynamic direct-writing to achieve controlled nanofiber assembly, thereby enhancing interfacial bonding and overall device performance. By employing electrohydrodynamic direct-writing, a copper-ammonia complex ((Cu(NH3))(CN)) nanofiber is self-stacked on a zinc oxide (ZnO) nanofiber to construct a zinc oxide and copper ammine complex (ZnO@(Cu(NH3))(CN)) photodetector with low static power consumption and high responsiveness through the combined effects of piezoelectricity and fiber self-stacking. The dark current is reduced to 1.12 × 10−7 A, and the static power consumption of the photodetector is also decreased. The responsiveness is up to 13.3 A/W, with response and recovery times of 11 and 9 ms under ultraviolet (UV) light illumination, respectively, fulfilling the requirements for highly sensitive photodetection owing to the high interface bonding. The detector's threshold voltage is tunable, ranging from 6 V for 5 stacking layers to 20 V for 25 stacking layers, thereby allowing the device's performance to be precisely tailored to specific application requirements. Leveraging the exceptional optoelectronic performance of the ZnO@(Cu(NH3))(CN) photodetector, this study expands the application scenarios of flexible photodetectors and demonstrates their potential in the fields of 6G technology and battlefield communication.

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Atomic GHZ States Prepared in Two Directly Coupled Cavities with Virtual Excitations in One Step

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Communications in Theoretical Physics 2011年第10期56卷 655-658页

作者：杨榕灿黄志平郭龑强张鹏飞钟纯勇张天才 State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi University School of Physics and Opto-Electronics Technology Fujian Normal University School of Physics and Opto-Electronics Technology Pujian Normal University

A scheme for one-step preparation of atomic GHZ states in two directly coupled cavities via virtual excitations is *** the whole procedure,the information is carried only in two ground states of A-type atoms, while the excited states of atoms and cavity modes are virtually excited,leading the system to be insensitive to atomic spontaneous emission and photon loss.

关键词： GHZ states virtual excitations coupled cavities

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Observation of higher-order deterministic optical vortices from random vortex beams

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APL Photonics 2025年第4期10卷

作者： Liu, Yonglei Xu, Siyu Peng, Peipei Zhang, Yongtao Dai, Siting Chen, Yahong Cai, Yangjian Wang, Fei School of Physical Science and Technology Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou215006 China School of Intelligent Manufacturing and Smart Transportation Suzhou City University Suzhou215104 China Key Laboratory of Light Field Manipulation and System Integration Applications in Fujian Province School of Physics and Information Engineering Minnan Normal University Zhangzhou363000 China Shandong Provincial Engineering and Technical Center of Light Manipulation Shandong Provincial Key Laboratory of Optics and Photonic Devices School of Physics and Electronics Shandong Normal University Jinan250014 China Joint Research Center of Light Manipulation Science and Photonic Integrated Chip of East China Normal University Shandong Normal University East China Normal University Shanghai200241 China Suzhou Key Laboratory of Intelligent Photoelectric Perception Soochow University Suzhou215006 China

Optical vortices in coherent beams have been identified as spiral phases with intensity nulls at singularities, while in random beams, they appear as coherence vortices in correlation functions, often not matching intensity nulls. Observing deterministic optical vortices in random beams is challenging due to their randomness. In this work, we propose a scheme relying on spatial coherence engineering and fractional Fourier transform to design a partially coherent light source capable of generating deterministic optical vortices at specific propagation distances in free space. At other propagation distances (including the source plane), the beam may exhibit coherence vortices characterized by spatially coupled two-point correlations, while deterministic vortices emerge only at designated distances. We show that both the topological charge and the axial position of the deterministic vortex are determined by the coherence parameters of the light source. Using a random-mode superposition approach, we experimentally synthesize such partially coherent light sources and characterize both coherence vortices and deterministic phase vortex through measurements of the four-dimensional correlation function at different propagation distances. In addition, we study the coherence phase orbital angular momentum (OAM) spectrum of the random beam both theoretically and experimentally. Our results reveal that the phase OAM spectrum is pure when the random beam carries a deterministic vortex, whereas for coherence vortices, the phase OAM spectrum is non-pure. This study provides a pathway for understanding and controlling the transition between deterministic phase vortices and coherence vortices, with potential applications in optical communication and metrology. © 2025 Author(s).

关键词： Optical design

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Improved performance of Ge n^+/p diode by combining laser annealing and epitaxial Si passivation

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Chinese Physics B 2018年第1期27卷 598-601页

作者：王尘许怡红李成林海军 Fujian Provincial Key Laboratory of Optoelectronic Technology and Devices School of Opto-electronic and Communiction EngineeringXiamen University of Technology Xiamen Institute of Technology Department of Physics Semiconductor Photonics Research Center Xiamen University

A method to improve Ge n＋/p junction diode performance by excimer laser annealing （ELA） and epitaxial Si passi- vation under a low ion implantation dose is demonstrated. The epitaxial Si passivation layer can unpin the Fermi level of the contact of Al/n-Ge to some extent and reduce the contact resistance. In addition, the fabricated Ge n ：/p junction diode by ELA plus epitaxial Si passivation exhibits a decreased reverse current density and an increased forward current density, resulting in a rectification ratio of about 6.5 x 10^6 beyond two orders magnitude larger than that by ELA alone. The reduced specific contact resistivity of metal on n-doped germanium and well-behaved germanium n＋/p diode arc beneficial for the performance improvement of Ge n-MOSFETs and other opto-electronic devices.

关键词： epitaxial Si passivation excimer laser annealing Ge n+/p junction

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Organic solar cells: beyond 20%

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Science China Materials 2025年 1-13页

作者： Ma, Ruijie Luo, Zhenghui Zhang, Youdi Zhan, Lingling Jia, Tao Cheng, Pei Yan, Cenqi Fan, Qunping Liu, Shengjian Ye, Long Zhang, Guangye Xu, Xiaopeng Gao, Wei Wu, Yue Wu, Jiaying Li, Yuxiang Liu, Yuhang Liu, Feng Song, Jiali Chen, Haiyang Chen, Weijie Zhang, Xin Liu, Yahui Yuan, Jun Liu, Quan Kan, Zhipeng Yin, Hang Li, Xiaojun Ma, Yunlong Deng, Dan Zhu, Lei Huo, Yong Fan, Baobin Fu, Huiting Liao, Xunfan Hu, Hanlin Li, Chao Yu, Runnan Hu, Huawei Yao, Zhaoyang Cai, Yunhao Qian, Deping Cui, Yong Yao, Huifeng Xu, Bowei Kan, Bin Gao, Ke Duan, Chunhui Hu, Xiaotian Sun, Huiliang School of Chemistry and Chemical Engineering Gannan Normal University Ganzhou 341000 China Department of Electrical and Electronic Engineering Research Institute for Smart Energy (RISE) Guangdong-Hong Kong-Macao (GHM) Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices The Hong Kong Polytechnic University 999077 Hong Kong Guangdong Provincial Key Laboratory of New Energy Materials Service Safety Shenzhen Key Laboratory of New Information Display and Storage Materials College of Materials Science and Engineering Shenzhen University Shenzhen 518060 China Key Laboratory of Advanced Green Functional Materials College of Chemistry Changchun Normal University Changchun 130032 China Key Laboratory of Organosilicon Chemistry and Material Technology Ministry of Education Zhejiang Key Laboratory of Organosilicon Material Technology College of Material Chemistry and Chemical Engineering Hangzhou Normal University Hangzhou 311121 China School of Optoelectronic Engineering Guangdong Polytechnic Normal University Guangzhou 510665 China College of Polymer Science and Engineering National Key Laboratory of Advanced Polymer Materials Sichuan University Chengdu 610065 China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong University Xi’an 710049 China School of Chemistry Key Laboratory of Electronic Chemicals for Integrated Circuit Packaging South China Normal University (SCNU) Guangzhou 510006 China School of Materials Science and Engineering State Key Laboratory of Advanced Materials for Intelligent Sensing Key Laboratory of Organic Integrated Circuits Ministry of Education Tianjin Key Laboratory of Molecular Optoelectronic Sciences Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin University Tianjin 300350 China College of New Materials and New Energies Shenzhen Technology University Shenzhen 518118 China College of Chemical Engineering Sichuan University Chengdu 610065 China Xiame

Organic solar cells (OSCs) have experienced remarkable performance progress up to 20% benchmark power conversion efficiency (PCE) in past years. Considering the <1% initial PCE obtained by OSC decades ago, the milestone of surpassing 20% efficiency is of great significance. Meanwhile, further performance promotion is urgently required for OSCs as other solution-processable photovoltaic technologies are also competitive. This review article aims to demonstrate a comprehensive summary of recent reports on OSCs with over 20% PCE, delving into key strategies including material innovations, multi-component system construction, deposition protocol optimization, solid/solvent additive engineering, as well as hole/electron transport layer development. In addition, this study identifies the next-stage scientific and technological issues that warrant greater attention. These issues are proposed to drive more prosperous research development, particularly in the field of flexible and wearable power suppliers. (Figure presented.) © Science China Press 2025.

关键词： device engineering molecule design opportunities and challenges organic solar cells power conversion efficiency

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