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SSRN 2024年

作者： He, Chongjun Zha, Jiahao Chen, Fangzhou Wang, Hongwei Dong, Biao Liu, Lijuan Xia, Mingjun Deng, Chenguang Li, Qian Lu, Yuangang Chen, Huiting Liu, Siguo Key Laboratory of Space Photoelectric Detection and Perception Ministry of Industry and Information Technology College of Astronautics Nanjing University of Aeronautics and Astronautics 29 Jiangjun Road Nanjing211106 China Beijing Center for Crystal Research and Development Key Laboratory of Functional Crystals and Laser Technology Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing100190 China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing100084 China School of Optoelectronic and Information Technology Zhongshan Torch Polytechnic Zhongshan528436 China

Fluorescence intensity ratio (FIR) technology is compulsorily needed in non-contact rare earth luminescent temperature sensor. Herein, we present Er/Yb: Y3Al5O12 phosphors synthesized via a high temperature solid-state reaction method. The crystal structure, microstructure, up-conversion luminescence, and energy transfer between the two ions were comprehensively analyzed. Under 980nm excitation, the samples exhibited four distinct transition bands at 475nm, 525nm, 546nm, and 664 nm. The methods of temperature measurement based on thermally coupled levels and non-thermally coupled levels were examined using the fluorescence intensity ratio method. Notably, the samples demonstrate exceptional performance in temperature measurement. Utilizing the thermally coupled level of I525/I546 as a basis for analysis yields a maximum relative sensitivity of 1.05%K-1. We observed that spectral color coordinates varied linearly with temperature within a specific range, suggesting its potential application as a means of temperature measurement. Furthermore, employing the non-thermally coupled levels of I546/I475 for temperature measurement results in an impressive maximum absolute sensitivity of 8.05%K-1 – nearly 24 times higher than that achieved through thermally coupled levels alone. Choice of energy levels significantly influences the sensitivity of uncoupled temperature measurements. Therefore, Er/Yb: Y3Al5O12 phosphors hold promise as viable candidates for components in temperature sensor applications. © 2024, The Authors. All rights reserved.

关键词： Yttrium aluminum garnet

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Growth and Characterizations of a New Nonlinear Optical Crystal for 266 Nm laser Generation: Lisr3be3b3o9f4

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SSRN 2022年

作者： Guo, Ruixin Bai, Lei Wu, Tong Liu, Lijuan Wang, Xiaoyang Beijing Center for Crystal Research and Development Key Laboratory of Functional Crystals and Laser Technology Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing100190 China School of Chemical Science University of Chinese Academy of Sciences Beijing100049 China

The LiSr 3 Be 3 B 3 O 9 F 4 (LSBBF) single crystal with dimensions of 30 × 20 × 15 mm 3 was grown from a LiF-NaBF 4 -B 2 O 3 -SrF 2 flux system using a top-seeded solution growth method with a seed perpendicular to the (011) plane. The X-ray rocking curve, transmission spectra, refractive indices, and laser-induced damage threshold have also been studied. The Sellmeier equations were derived from the measured refractive indices for the first time . According to the Sellmeier equations, the shortest phase-matching frequency doubling wavelength of LSBBF is determined to be 241nm, which indicates LSBBF is a potential UV nonlinear optical crystal for the fourth harmonic generation of Nd:YAG laser at 266nm. © 2022, The Authors. All rights reserved.

关键词： Refractive index

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Strong Kerr electro-optic effects in PMN-PT single crystal with low composition by Sm doping

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Ceramics International 2025年

作者： Wang, Hongwei He, Chongjun Deng, Chenguang Chen, Ziyun Chen, Hongbing Chen, Fangzhou Zha, Jiahao Dong, Biao Liu, Lijuan Xia, Mingjun Li, Qian Lu, Yuangang Key Laboratory of Space Photoelectric Detection and Perception in Ministry of Industry and Information Technology College of Astronautics Nanjing University of Aeronautics and Astronautics 29 Jiangjun Road Nanjing211106 China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing100084 China School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai200240 China School of Materials Science and Chemical Engineering Ningbo University Ningbo315211 China Beijing Center for Crystal Research and Development Key Laboratory of Functional Crystals and Laser Technology Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing100190 China

Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-xPT) single crystal has been applied in many fields due to its excellent piezoelectric properties, but the optical properties remains to be explored. Here, the rhombohedral phase PMN-0.15 PT and 1 % Sm doped PMN-0.15 PT single crystal (Sm-PMN-0.15 PT) were grown by the Bridgman method. The crystal structure was investigated by X-ray diffraction, HRTEM, Raman spectra and second harmonic generation (SHG) microscopy. Combined with the characterization of dielectric, ferroelectric and electro-optic effects, we revealed the dynamic response of polar nanoregions (PNR) and phase transition to the electro-optic properties of crystals. The results demonstrate that the doping of Sm3+ ions can effectively reduce the Curie temperature (Tm) from 57 °C to 38 °C while maintaining high dielectric response characteristics. The Kerr electro-optic coefficient of PMN-0.15 PT and Sm-PMN-0.15 PT can reach 2.55 × 10−16 m2/V2 at 48 °C and 3.40 × 10−16 m2/V2 around 38 °C respectively. Due to the influence of PNR, the peak value of the Kerr electro-optical coefficient measured in the cooling process is higher than that measured in the heating process. The Sm-PMN-0.15 PT has a wide operating temperature range close to room temperature and stable response of frequency, rendering it promising candidate for application in electro-optic devices. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Kerr electrooptical effect

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High Efficiency Cryogenic Cw Nd:Yalo3 laser with Three Wavelengths at 1064, 1072 and 1079 Nm

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SSRN 2022年

作者： Zong, Nan Song, Yan-Jie Wang, Zhi-Min Chen, Zhong-Zheng Zhang, Shen-Jin Wang, Xiao-Jun Bo, Yong Peng, Qin-Jun Key Lab of Solid State Laser Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing100190 China Key Lab of Functional Crystal and Laser Technology Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing100190 China Institute of Optical Physics and Engineering Technology Qilu Zhongke Jinan250000 China

A high efficiency high brightness continuous wave (cw) cryogenic a-cut Nd:YAlO 3 (Nd:YAP) laser is demonstrated with three wavelengths at 1064, 1072 and 1079 nm. By exploring the temperature dependence of the fluorescence and the absorption spectra from the a-cut Nd:YAP crystal, the feasibility of multi-wavelength laser operation is analyzed. At an optimal temperature of ~180 K, a maximum output power for dual-wavelength operation is reached 2.1 W at an incident pump power of 4.6 W, corresponding to a slope efficiency up to 50%. The average beam quality factor is measured to be 1.17, indicating a brightness of ~130MW/cm 2 ·sr. These results present, to the best of authors knowledge, the highest brightness and slop efficiency for any multi-wavelength Nd:YAP laser. Such brightness multi-wavelength laser source with high beam quality has important applications in scientific research, laser radar and astronomy domains, especially in obtaining terahertz (THz) sources. © 2022, The Authors. All rights reserved.

关键词： Luminance

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A Sodium Tantalum Phosphate with a Noncentrosymmetric Structure: Na5Ta8P5O35

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SSRN 2022年

作者： Zhang, Qiaoxin Li, Rukang Beijing Center for Crystal Research and Development Key Laboratory of Functional Crystals and Laser Technology Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing100190 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China

A sodium tantalum phosphate Na5Ta8P5O35 has been successfully obtained by spontaneous crystallization in high temperature solution. It belongs to the noncentrosymmetric R32 space group with a = 8.895 (2) Å, c = 29.992 (12) Å and Z = 3. The structure resembles those of tungsten bronzes with main building blocks of the [Ta6O27] unit composed of 2 × 3 corner-sharing Ta1O6 octahedra. [Ta6O27] units are joined by two P1O4 tetrahedra and two Ta2O6 octahedra forming [Ta8P2O29]∞ layer in the bc plane. Those layers are further connected via P2O4 groups along the c direction leaving triangular and pentagonal tunnels in the 3-dimensional framework. Both sodium atoms reside in the pentagonal tunnel with Na1 (9d) site partially occupied (2/3). The Ta5+ ions show second-order Jahn-Teller effects with significant TaO6 distortions that are favorable to obtain large hyperpolarizabilities. Powder Kurtz-Perry test and reflectance spectroscopy studies reveal that it exhibits moderate second harmonic effect of about 0.5 × KDP and an optical band gap of 3.93 eV. © 2022, The Authors. All rights reserved.

关键词： Sodium compounds

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Integrated sensing from the synergetic color change of the center/brush of cholesteric liquid crystal particles

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Science China Materials 2022年第9期65卷 2565-2577页

作者： Yuanyuan Shang Chenglin Zheng Guochun Zhang Dong Chen Jingxia Wang Lei Jiang CAS Key Laboratory of Bio-inspired Materials and Interfaces Sciences Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Center of Material Science and Optoelectronics Engineering School of Future TechnologiesUniversity of Chinese Academy of SciencesBeijing 100049China Ji Hua Laboratory Foshan 528000China Key Laboratory of Functional Crystals and Laser Technology of Chinese Academy of Sciences Key Laboratory of CryogenicsTechnical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Institute of Process Equipment College of Energy EngineeringZhejiang UniversityHangzhou 310027China

Cholesteric liquid crystal(CLC)particles can adaptively respond to constant changes in external stimuli and thus are widely used in solvent-sensing,pattern fabrication,and *** studies discussed the color change at the center of the particles for various ***,few studies analyzed the color change of the brush structure of particles in response to various applications because of the complicated birefringence *** this paper,we present a novel integrated sensing system based on the synergetic color change from the center and the brush structure of CLC *** system provides abundant and additional sensing information relative to the traditional *** particles are prepared by mixing reactive mesogens,a reactive chiral dopant,a non-reactive LC molecule,and a photoinitiator by using a microfluidic device and subsequent *** CLC particles exhibit gorgeous color at the center and brush structure upon various solvent stimuli because of the Bragg reflection and the birefringence effect,which is explained by the possible color-changing mechanism introduced in this *** proof-of-concept applications,such color-changing polymer particles are demonstrated in multi-solvent-sensing detection and pattern *** study provides new insights into the development of stimuli-responsive advanced functional materials with tailorable nanostructures toward technological applications ranging from sensing to display.

关键词： cholesteric liquid crystal particles integrated-sensing center-brush structure synergetic color change

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Surface functionalization of phosphorene via P–H bond for ambient protection and robust photocatalytic H_(2) evolution

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Science China Materials 2022年第5期65卷 1245-1251页

作者： Rui Shi Lei Kang Xiaojuan Bai Yong Chen Key Laboratory of Photochemical Conversion and Optoelectronic Materials&CAS-HKU Joint Laboratory on New Materials Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Key Laboratory of Functional Crystals and Laser Technology Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Key Laboratory of Urban Stormwater system and Water Environment Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk ControlBeijing University of Civil Engineering and ArchitectureBeijing 100044China University of Chinese Academy of Sciences Beijing 100190China

The facile oxidation of few-layer black phosphorus(i.e., phosphorene) in the atmospheric environment is a major hurdle for its applications in photocatalytic solarenergy conversion. The introduction of protective layers, such as a surface capping layer, surface coordination, and P–C covalent functionalization, can protect phosphorene from oxidative degradation but inevitably decreases its photocatalytic performance due to the blockage of catalytic active sites. Herein, we develop a hydrogenation approach via the introduction of P–H covalent bonds on the surface of phosphorene(i.e., phosphorene-H) to inhibit the oxidation of phosphorene-H without sacrificing the original photocatalytic H_(2) evolution performance. Experiments and density functional theory calculations demonstrate that about 5 mol% of phosphorus atoms in phosphorene-H are involved in forming P–H covalent bonds, hindering the reaction between O_(2) and phosphorene-H in terms of thermodynamics and *** hydrogenation strategy is envisaged to augment the prospect of phosphorene in the field of photocatalysis.

关键词： phosphorene antioxidation hydrogenation photocatalytic H_(2)evolution

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Barocaloric effect in ferroelastic Pb3（VO4）2

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Chinese Physics B 2025年第3期 505-510页

作者：程鹏涛陈祖华张成亮张正明李昺王敦辉 Hangzhou Dianzi University National Laboratory of Solid State Microstructures Nanjing University Center for Crystal Research and Development Key Laboratory of Functional Crystals and Laser Technology Key Laboratory of CryogenicsTechnical Institute of Physics and Chemistry Chinese Academy of Sciences Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences School of Materials Science and Engineering University of Science and Technology of China

The barocaloric effect is considered as one of the most promising refrigeration with the potential to replace traditional gas compression refrigeration. One of the main obstacles to the application of barocaloric materials lies in the requirement for high driving pressures. In this paper, we report on the barocaloric effect of Pb3（VO4）2, which exhibits a ferroelastic transition from a high-temperature trigonal structure to a low-temperature monoclinic structure at 357 K, accompanied by a substantial volume change. The entropy change induced by hydrostatic pressure can reach up 14 J·kg-1·K-1under a relatively low pressure of 80 MPa. This work is expected to expand the selection range of barocaloric materials.

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Crystal Structures and Magnetocaloric Properties of Li5asrmb12o24 (a = Mg, Zn;M = Cr, Ni)

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SSRN 2022年

作者： Chen, Yuwei Feng, Jingcheng Fan, Feidi Shen, Jun Tu, Heng Zhang, Guochun Center for Crystal Research and Development Key Laboratory of Functional Crystals and Laser Technology Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing100190 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China Key Laboratory of Cryogenics Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing100190 China

Three new transition-metal-based borate crystals, Li5MgSrMB12O24 (M = Cr, Ni) and Li5ZnSrNiB12O24, were obtained using the high temperature solution method. Their structures were determined by the single crystal X-ray diffraction, which crystallize in the trigonal R [[EQUATION]] space group. The [B3O11] groups in the structures lead to the long distance between two nearest magnetic ions, which can reduce the interaction of adjacent magnetic centers. The magnetic properties and thermal stabilities of the title compounds were also investigated. The results indicated that Li5MgSrCrB12O24 has stable chemical-physical properties and small magnetic hysteresis, of which the maximum –ΔSm value is about 14.33 J·kg–1·K–1 at 2 K for Δμ0H = 9 T. © 2022, The Authors. All rights reserved.

关键词： Magnetic materials

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Enhanced Coplanarity and Giant Birefringence in Hydroxypyridinium Nitrate via Hydrogen Bonding between Planar Donors and Planar Acceptors

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Angewandte Chemie 2024年第5期137卷

作者： Jian-Ping Yin Jingyu Guo Hao Huo Xin Liu Xue-Jie Cheng Prof. Dr. Zheshuai Lin Prof. Dr. Li-Ming Wu Prof. Dr. Ling Chen Beijing Key Laboratory of Energy Conversion and Storage Materials College of Chemistry Beijing Normal University Beijing 100875 People's Republic of China Center for Advanced Materials Research Beijing Normal University Zhuhai 519087 People's Republic of China Functional Crystals Lab Key Laboratory of Functional Crystals and Laser Technology Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 People's Republic of China

Birefringent crystals, which possess optical anisotropy, are important optical components. However, designing and synthesizing birefringent crystals faces the challenge of achieving anisotropic structures, especially coplanar geometries. Herein, we achieve a significant birefringence in an ionic compound (C 5 H 6 ON) + (NO 3 ) − , (4-hydroxypyridinium nitrate, 4HPN) by hydrogen bonding between planar donors and planar acceptors. We demonstrate that the interactions between the planar hydrogen bond donor ((C 5 H 6 ON) + ) and planar hydrogen bond acceptor ((NO 3 ) − ) ensure the coplanarity during the crystal packing, generating the desired giant optical anisotropy. On two manually cut crystal chips, we observe a =0.494 ( =0.593), which is the largest among nitrates, or hydroxypyridinium derivatives. This value already surpasses those of the benchmark crystals, e.g., YVO 4 and CaCO 3 , commonly used in the UV to visible and near IR spectral range. 4HPN also exhibits a strong second harmonic generation response (9.55×KDP). This strategy offers a promising avenue for the design and development of birefringent crystals with potential applications in optical communication, sensing and signal processing devices.

关键词： Birefringence Coplanar arrangement Hydrogen bond Second harmonic generation

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