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Insight into crystal growth and upconversion luminescence property of tetragonal Ba_(3)Sc_(2)F_(12) nanocrystals

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Rare Metals 2021年第1期40卷 113-122页

作者： Juan Xie Guang-Chao Zheng Yang-Ming Hu Farhat Nosheen Zhi-Cheng Zhang er-jun liang School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450001China Division of Science and Technology Department of ChemistryUniversity of EducationLahore 54770Pakistan Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of ChemistrySchool of ScienceTianjin University and Collaborative Innovation Center of Chemical Science and EngineeringTianjin 300072China

Sc-based nanomaterials have attracted considerable attention due to their unique optical properties different from those of Ln/Y-based ***,studies on Sc-based nanomaterials are far from ***,nanoscale alkaline(Ca,Sr and Ba)scandium fluorides were almost ignored for their stringent synthetic ***,we synthesize high-quality tetragonal phase Ba_(3)Sc_(2)F_(12) nanocrystals with uniform morphology and good dispersibility by carefully tailoring the reaction conditions,such as the molar ratio of reactants,temperature and reaction ***,the upconversion(UC)luminescence property of Ba_(3)Sc_(2)F_(12):Yb/er(Ho)samples is investigated in *** doping concentrations of sensitizer(Yb^(3+))and activator(er^(3+)and Ho^(3+))are optimized for the strongest UC luminescence,of which the corresponding energy transfer processes are also ***,tetragonal Ba_(3)Sc_(2)F_(12) nanocrystals can gradually transform into hexagonal Ba_(4)Yb_(3)F_(17) nanocrystals with the increase in Yb^(3+)doping *** work provides a novel type of Sc-based nanomaterials with strong red UC emissions which are promising in high-resolution 3-dimensional color displays,laser,bioimaging and biolabels.

关键词： Ba_(3)Sc_(2)F_(12)nanocrystals Crystal growth Upconversion Sc-based nanomaterials

Low thermal expansion and broad band photoluminescence of Zr0.1Al1.9Mo2.9V0.1O12

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Chinese Physics B 2021年第3期30卷 423-429页

作者： jun-Ping Wang Qing-Dong Chen Li-Gang Chen Yan-jun Ji You-Wen Liu er-jun liang Shandong Engineering Research Center of Aeronautical Materials and Devices Key Laboratory of Aeronautical Optoelectronic Materials and DevicesCollege of Aeronautical EngineeringBinzhou UniversityBinzhou 256603China College of Science Nanjing University of Aeronautics and AstronauticsNanjing 210016China School of Physical Science&Engineering and Key Laboratory of Materials Physics of Ministry of Education Zhengzhou UniversityZhengzhou 450052China

A new material of Zr0.1Al1.9Mo2.9V0.1O12 is synthesized by the traditional solid state synthesis *** phase transition,coefficient of thermal expansion,and luminescence properties of Zr0.1Al1.9Mo2.9V0.1O12 are explored with Raman spectrometer,dilatometer,and x-ray diffraction(XRD)*** results show that the Zr0.1Al1.9Mo2.9V0.1O12 possesses the strong broad-band luminescence characteristics almost in the whole visible *** sample is crystallized in a monoclinic structure group of P21/a(No.14)crystallized at room temperature(RT).The crystal is changed from monoclinic to orthorhombic structure when the temperature increases to 463 *** material has very low thermal expansion performance in a wide temperature *** excellent low thermal expansion and strong pale green light properties in a wide temperature range suggest its potential applications in light-emitting diode(LED)and other optoelectronic devices.

关键词： low thermal expansion phase transition x-ray diffraction(XRD) Raman spectrum luminescence

Ultrafast carrier dynamics of Cu_(2)O thin film induced by two-photon excitation

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Chinese Physics B 2021年第11期30卷 348-351页

作者： Jian Liu Jing Li Kai-jun Mu Xin-Wei Shi jun-Qiao Wang Miao Mao Shu Chen er-jun liang School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450001China

Cuprous oxide(Cu_(2)O)has attracted plenty of attention for potential nonlinear photonic applications due to its superior third-order nonlinear optical property such as two-photon *** this paper,we investigated the two-photon excitation induced carrier dynamics of a Cu_(2)O thin film prepared by radio-frequency magnetron sputtering,using the femtosecond transient absorption *** dynamics including an ultrafast carrier scattering(er recombination(>50 ps)were *** time constant of carrier scattering under two-photon excitation is larger than that under one-photon excitation,due to the different transition selection rules and smaller absorption coefficient of the two-photon excitation.

关键词： carrier dynamics cuprous oxide transient absorption two-photon absorption

Laser scattering, transmittance and low thermal expansion behaviors in Y2-x（ZnLi）xMo3O12 by forming regular grains

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Chinese Physics B 2019年第9期28卷 320-326页

作者： Xian-Sheng Liu Yong-Guang Cheng Bao-He Yuan er-jun liang Wei-Feng Zhang Henan Key Laboratory of Photovoltaic Materials and Low Dimensional Materials Science Laboratory Henan UniversityKaifeng 475004China College of Science Center of Analysis and Testing of Henan Institute of EngineeringZhengzhou 451191China North China University of Water Resources and Electric Power Zhengzhou 450011China School of Physical Science & Engineering and Key Laboratory of Materials Physics of Ministry of Education of China Zhengzhou UniversityZhengzhou 450052China

Ceramics usually have irregular grains, cracking, or porosity, which result in their lightproof.Y2Mo3O12 ceramics have more porosity due to the heavy *** ZnLi to Y2Mo3O12 could form regular grains, reduce cracking and *** increasing the content of ZnLi, the grain shapes self-assembly gradually and then the laser scattering and transmittance *** laser scattering property and transmittance of diverging rays become the best in ceramics Y2-x(ZnLi)xMo3O12(x = 1.0 and 1.2) with regular grains and low thermal *** formation mechanism of regular grains is ascribed to the substitutions of Zn^2+ and Li+for Y^3+ in Y2Mo3O12 resulting in the preferential *** investigation in laser scattering, transmittance and low thermal expansion behaviors of Y2-x(ZnLi)xMo3O12 could pave a way to weaken the strong-laser attack from the high-power laser weapon and the other.

关键词： low thermal expansion laser scattering regular grains diverging rays transmittance

Fast achievement of quantum state transfer and distributed quantum entanglement by dressed states

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Chinese Physics B 2020年第5期29卷 107-118页

作者： liang Tian Li-Li Sun Xiao-Yu Zhu Xue-Ke Song Lei-Lei Yan er-jun liang Shi-Lei Su Mang Feng School of Physics Zhengzhou UniversityZhengzhou 450001China College of Physics Tonghua Normal UniversityTonghua 134000China College of Science Henan University of EngineeringZhengzhou 451191China School of Physics and Material Science Anhui UniversityHefei 230601China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071China

We propose schemes to realize quantum state transfer and prepare quantum entanglement in coupled cavity and cavity-fiber-cavity systems,respectively,by using the dressed state *** first give the expression of pulses shape by using dressed states and then find a group of Gaussian pulses that are easy to realize in experiment to replace the ideal pulses by curve *** also study the influence of some parameters fluctuation,atomic spontaneous emission,and photon leakage on *** results show that our schemes have good *** the atoms are trapped in different cavities,it is easy to perform different operations on different *** proposed schemes have the potential applications in dressed states for distributed quantum information processing tasks.

关键词： quantum state transfer dressed state method distributed quantum information processing

Phase transition and near-zero thermal expansion of Zr_(0.5)Hf_(0.5)VPO_7

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Chinese Physics B 2018年第6期27卷 350-354页

作者： jun-Ping Wang Qing-Dong Chen Sai-Lei Li Yan-jun Ji Wen-Ying Mu Wei-Wei Feng You-Wen Liu Gao-Jie Zeng er-jun liang College of Science Nanjing University of Aeronautics and Astronautics Nanjing 210016 China College of Aeronautics and Engineering Binzhou College Binzhou 256603 China Key Laboratory of Materials Physics of Ministry of Education School of Physical Science and Engineering Zhengzhou University Zhengzhou 450052 China

The Zr（0.5）Hf（0.5）VPO7 is successfully synthesized by the solid-state method with near-zero thermal expansion. Powder x-ray diffraction（XRD）, Raman spectroscopy, thermal dilatometry, and scanning electron microscopy（SEM） are used to investigate the structure, the phase transition, and the coefficient of thermal expansion（CTE） of Zr（0.5）Hf（0.5）VPO7. The investigation results show that the samples are of the single cubic type with a space group of Pa3ˉ at room temperature（RT）.It can be inferred that the superstructure is transformed from the 3 × 3 × 3 superstructure to the 1 × 1 × 1 ideal crystal in a temperature range between 310 K and 323 K. The CTE is measured by a dilatometer to be 0.59 × 10^（-6） K^（-1）（310 K–673 K）. The values of intrinsic（XRD） and extrinsic（dilatometric） thermal expansion are both near zero. The results show that Zr（0.5）Hf（0.5）VPO7 has near-zero thermal expansion behavior over a wide temperature range.

关键词： near-zero thermal expansion phase transition x-ray diffraction (XRD) Raman spectrum

Near-zero thermal expansion inβ-CuZnV_(2)O_(7)in a large temperature range

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Chinese Physics B 2022年第4期31卷 555-561页

作者： Yaguang Hao Hengli Xie Gaojie Zeng Huanli Yuan Yangming Hu Juan Guo Qilong Gao Mingju Chao Xiao Ren er-jun liang Key Laboratory of Materials Physics of Ministry of Education and School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China

We report a new type of near-zero thermal expansion materialβ-CuZnV_(2)O_(7)in a large temperature range from 173 K to 673 *** belongs to a monoclinic structure(C2/c space group)in the whole temperature *** structural phase transition is observed at atmospheric pressure based on the x-ray diffraction and Raman *** high-pressure Raman experiment demonstrates that two structural phase transitions exist at 0.94 GPa and 6.53 GPa,*** mechanism of negative thermal expansion inβ-CuZnV_(2)O_(7)is interpreted by the variations of the angles between atoms intuitively and the phonon anharmonicity intrinsically resorting to the negative Grüneisen parameter.

关键词： negative thermal expansion materials β-CuZnV_(2)O_(7) expansion mechanism Raman spectrum

Two-step phase-shifting Fresnel incoherent correlation holography based on discrete wavelet transform

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Chinese Physics B 2020年第12期29卷 233-237页

作者： Meng-Ting Wu Yu Zhang Ming-Yu Tang Zhi-Yong Duan Feng-Ying Ma Yan-Li Du er-jun liang Qiao-Xia Gong School of Physics and Microeletronics Zhengzhou UniversityZhengzhou 450001China

Fresnel incoherent correlation holography(FINCH)has the ability to generate three-dimensional images with a superresolution by using incoherent ***,there are unwanted direct current term and twin image in interferograms,so it is of great significance to find a method to eliminate ***-shifting technology is a most widely used technique for this task,but its three-step phase-shifting is not suitable for the instantaneous measurement of dynamic objects,and the quality of reconstructed image with the traditional two-step phase-shifting is *** this paper,we present a method of enhancing the resolution through using a two-step phase-shifting technology based on the discrete wavelet *** two-step phase-shifting,the resulting hologram is a superposition of multiple *** frequency of the resulting hologram is decomposed into different levels through using discrete wavelet transform,then the image is reconstructed after retrieving the low frequency *** experiments have verified the effectiveness of this method.

关键词： holography phase-shifting wavelet transform

Zero and controllable thermal expansion in HfMgMo(3-x)WxO(12)

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Chinese Physics B 2017年第1期26卷 348-352页

作者： Tao Li Xian-Sheng Liu Yong-Guang Cheng Xiang-Hong Ge Meng-Di Zhang Hong Lian Ying Zhang er-jun liang Yu-Xiao Li School of Physical Science ＆ Engineering and Key Laboratory of Materials Physics of Ministry of Education Zhengzhou University Zhengzhou 450052 China Henan Key Laboratory of Photovoltaic Materials and School of Physics and Electronics Henan University Kaifeng 475004 China School of Physical Science ＆ Engineering and Key Laboratory of Materials Physics of Ministry of Education Zhengzhou University Zhengzhou 450052 China

HfMgMo（3-x）WxO（12） with x = 0.5, 1.0, 1.5, 2.0, and 2.5 are developed with a simple solid state method. With increasing the content of W, solid solutions of Hf Mg Mo3-xWx O12 crystallize in an orthorhombic structure for x≤2.0 and a monoclinic structure for x2.0. A near-zero thermal expansion（ZTE） is realized for HfMgMo（2.5）W（0.5）O（12） and negative coefficients of thermal expansion（NCTE） are achieved for other compositions with different values. The ZTE and variation of NCTE are attributed to the difference in electronegativity between W and Mo and incorporation of a different amount of W, which cause variable distortion of the octahedra and softening of the MoO4 tetrahedra, and hence an enhanced NCTE in the a- and c-axis and reduced CTE in the b-axis as revealed by Raman spectroscopy and x-ray diffraction.

关键词： zero thermal expansion negative thermal expansion orthorhombic structure solid solution Raman spectroscopy