Symmetry-Basel
·
2023
·Vol. 15
·期 10
·1885
·
IF 2.7
Hongliang Zhu,Li Fan,Yuxuan Wang,Kaili Wang,Hao Liu,Jiawei Zhang,Shancheng Yan
Symmetry-deficient two-dimensional (2D) layered materials induce a highly anisotropic optical response due to the anisotropy in their crystal structure, facilitating their application in polarized nanodevices. Intercalation is a new way to tune the optoelectronic properties of materials by inserting guest atoms into layered host materials, and 2D layered structures stacked with van der Waals gaps are a prerequisite for this phase of the technique. In this paper, 2D tellurium nanosheets were synthesized with a hydrothermal method, and copper atoms were inserted with a wet chemical method. The widening of the crystal plane spacing proves the introduction of copper atoms, and polarization−related second-harmonic-generation (SHG) studies reveal the intrinsic anisotropic modes of the two samples, and birefringent properties are found with polarizing light microscopy. We further investigated the electrical properties of the samples, and the embedding of the copper atoms caused the samples to exhibit higher currents, but their devices lost the gate control effect.Keywords:tellurium nanosheets;intercalation;birefringence
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Laser & Photonics Reviews
·
2025
·
IF 10
Yaoguo Shen,Jiajia Xiong,Mengqing Wu,Mengcai Li,Yingwu Zhou,Yanjie Zhang
Here, three crystals are successfully synthesized by introducing a high polarizability birefringence-active gene. Theoretical calculations reveal that they demonstrate birefringence values of 0.89, 0.85 and 0.82 at 550 nm, respectively, significantly exceeding those of currently available commercial birefringent crystals. This study proposes a method that employs a conformational-locking strategy to fix the planar conformation of π -conjugated groups, thereby enhancing the birefringence value.
研究领域:
材料科学
·
光学材料
·
晶体工程
·
凝聚态物理
·
非线性光学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2024
·Vol. 27
·期 1
·30-37
·
IF 2.6
Yue Zhao,Chun-Li Hu,Peng-Fei Chen,Ming-Zhi Zhang,Jiang-Gao Mao
Ultraviolet (UV) birefringent crystals have important applications in polarizers, optical isolators and optical information processing. Crystals with large birefringence can enhance the modulation ability of light and realize the miniaturization of devices. However, the birefringence of cyanurates is often limited by the large dihedral angles between anionic groups. In this work, a chiral-driven approach is proposed for the first time to construct cyanurates with large birefringence. We combined racemic or chiral α-methylbenzylamine (α-MBA) molecules with a π-conjugated cyanurate group (CY), which led to the isolation of three organic hybrid cyanurates with wide band gaps >5.10 eV, namely, rac-α-MBACY, R-α-MBACY, and S-α-MBACY. Notably, the presence of chirality leads to a significant reduction of the dihedral angle between the α-MBA cation and (H2C3N3O3)− anion and a threefold increase in birefringence from 0.113@546 nm to 0.344@546 nm and 0.338@546 nm. The birefringence values of R-α-MBACY and S-α-MBACY exceed those of most of the cyanurates and commercial crystals, indicating their potential as UV birefringent crystals. This work provides new insights into the design and syntheses of UV birefringent materials.
研究领域:
材料科学
·
光学
·
无机化学
·
有机化学
·
晶体工程
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Li-Jia Yao,Chun-Li Hu,Zhi Fang,Jiang-Gao Mao
Birefringent materials are very important in the laser industry. By combining the hexathiodiphosphate(IV) [P 2 S 6 ] 4- unit and the highly polarizable Hg 2+ , a mercury hexathiodiphosphate(IV) Hg 2 P 2 S 6 was designed and synthesized by using solid-state synthesis. Hg 2 P 2 S 6 crystallizes in P 1 ¯ space group. It has a layered structure as in many hexathiodiphosphates(IV) such as ZnPS 3 , CdPS 3 . Its crystal structure, electronic structure and optical properties are investigated by experimental methods and first-principle calculations. Hg 2 P 2 S 6 has a very large birefringence of 0.50 at 1064 nm and 0.48 at 2050 nm. Theoretical studies show the large birefringence comes from the synergistic effect of [P 2 S 6 ] 4- and [HgS 4 ] 6- groups with strong polarizability anisotropy.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
SOLID STATE SCIENCES
·
2022
·
IF 3.752
Bao Jiang,Kewang Zhang,Yuchen Yan,Yanhui Zhang,Zhi Su
The single crystal of Pb 2 IO 3 Br 3 was successfully synthesized by the hydrothermal method , which is the first case of bromine-containing iodate. The polycrystalline powder of the compound was synthesized and its purity was characterized by X-ray single crystal diffraction. Pb 2 IO 3 Br 3 crystallized in the space group P 1 ( — ) (No. 2). In the structure of Pb 2 IO 3 Br 3 , the isolated [IO 3 ] - groups are in a reverse arrangement to fill in the tunnels of the three-dimensional network that is composed of [PbBr n ] polyhedra. In addition, first-principle calculations have been performed to investigate the relationship between the crystal structure and the optical properties . The result indicates Pb 2 IO 3 Br 3 possesses a moderate birefringence (Δn = 0.064, λ = 1064 nm), which is mainly originated from the umbrella-like [IO 3 ] groups and the [PbOBr] polyhedra.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 34
·11999-12005
·
IF 4.39
Huanhuan Cheng,Abudukadi Tudi,Peng Wang,Kewang Zhang,Zhihua Yang,Shilie Pan
A new ternary Ba-based selenide, Ba3SiSe5, was synthesized by a high-temperature solid-state method. It crystallizes in the centrosymmetric space group Pnma (no. 62) of the orthorhombic system. The structure of the title compound consists of unique Se(4)Ba layers and discrete SiSe4 tetrahedra. The structure and computational properties of Ba3SiSe5 are systematically studied together with those of the Ba–MIV–Q (MIV = Si, Ge; Q = S, Se) system, and show an interesting difference in dimensions formed by one of the crystallographic Ba atoms and MIVQ4 tetrahedra, as well as optical property transformations modulated by MIV atoms. First principles methods were employed to obtain a better understanding of the relationship between structures and properties. Ba3SiSe5 maintains a moderate birefringence of 0.044@1064 nm and the real space atom cutting method indicates that the SiSe4 tetrahedra make the major contribution to its birefringence.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
PubMed
高影响因子
LIQUID CRYSTALS
·
2019
·
IF 3.078
Qiang Weng,Liang Zhao,Ran Chen,Qi An,Zhongwei An,Xingbing Chen,Pei Chen
New liquid crystals of 3HEHV ((4-trans-propyl-cyclohexyl-1), (4ʹ-vinyl-cyclohexyl-1ʹ)-ethane-1,2) and 3HB2V ((4-trans-propyl-cyclohexyl-1), (4-butenyl-3,4)-benzene) were synthesised and evaluated as the diluents for medium birefringence liquid crystal mixtures. The procedures transferring cis-isomers into trans-isomers of the cyclohexane were described. The results showed that both 3HEHV and 3HB2V decrease the crystallisation temperature and the viscosities by doping them with the medium birefringence mixtures in a fraction of 15%. The characteristics of the structures are correlated with the properties of the mixtures.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Tingyu Wang,Han Luo,Shunke Zhang,Ling Huang,Liling Cao,Xuehua Dong,Guohong Zou
Two tellurium(IV) vanadates, KTeOVO4 and Ca2TeV2O9, were synthesized by integrating Te4+ with lone-pair of electrons and V5+ exhibiting the second-order Jahn–Teller effect (SOJT) active centers. Both compounds feature unique one-dimensional chain structures formed by [TeO4] and [VOx] polyhedra, resulting in notable birefringence values of 0.162 and 0.128 at 546 nm, respectively, higher than those of commonly used materials like α-BaB2O4 (0.116@1064 nm) and LiNbO3 (0.074@1440 nm). Additionally, they demonstrate excellent thermal stability (up to 500 and 700 °C) and broad transparency ranges (0.39–10.00 μm and 0.53–10.68 μm), enabling potential applications in near- and mid-infrared optical devices. Structural and theoretical analyses reveal that the enhanced birefringence arises from the synergistic effects of Te4+ lone-pair electrons and the anisotropic polarizability of V5+ centers.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Optical Materials Express
·
2019
·Vol. 9
·期 9
·3835-3842
·
IF 2.673
Xianshun Lv,Xianshun Lv,Xianshun Lv,Ping Wang,Huajian Yu,Huajian Yu,Yanyan Hu,Yanyan Hu,Huadi Zhang,Huadi Zhang,Chengcheng Qiu,Chengcheng Qiu,Jing Li,Jing Li,Jing Li,Xuping Wang,Xuping Wang,Bing Liu,Bing Liu,Yuanyuan Zhang,Yuanyuan Zhang,Yuanyuan Zhang
A colorless crystal of Ba2Mg(BO3)2 about 37 × 25 × 17 mm3 has been grown successfully by the Kyropoulos method. Thermal analyses results show that Ba2Mg(BO3)2 melts congruently. The phase purity of the raw materials and the grown crystals were confirmed by powder X-ray diffraction. Ba2Mg(BO3)2 exhibits a low UV cutoff of 187 nm and high transmittance below 3000 nm. The refractive indices of the crystal have been measured and the the least-squares fitting method was used to obtain the Sellmeier dispersion equations. The results indicate that Ba2Mg(BO3)2 is a potential birefringence crystal with large birefringence of 0.10422 at 546 nm.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
LIQUID CRYSTALS
·
2022
·
IF 2.676
Tong Zhang,Yuyu He,Fanghua Liang,Ran Chen,Pei Chen,Xinbing Chen,Zhongwei An
A series of benzimidazole-based liquid crystal compounds containing laterally difluoro-substituted and ethynyl linking groups, namely, 2-(4-(2-(2,3-difluoro-4-(alkoxy) phenyl)ethynyl)phenyl)-1-methyl-1 H-benzimidazolem derivatives (nPF(2,3)EPMx), are synthesised and investigated for their mesomorphic properties. These compounds mainly display enantiotropic nematic mesophases in the ranges of 32.0–44.5°C (heating process) and 50.0–64.0°C (cooling process). 10PF(2,3)EPMx exhibits lower clearing points and broader nematic phase ranges than nonfluorinated reference compound 10PEPMx, because of their slightly increased dipole moment. nPF(2,3)EPMx displays much larger theoretical birefringence (0.43–0.55) and experimental birefringence (0.42–0.53) than the common tolane-based liquid crystals, which is ascribed to its large π-conjugated molecule composed of benzene core, ethynyl linking group and benzimidazole terminated unit. The theory results of three-dimensional molecular conformations with dipole moment (µ), ratio of length to width (L/W), polarisability anisotropy (Δα) and average polarisability (Δα) calculated with density functional theory are also helpful in explaining the experimental results.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2021
·Vol. 12
·期 1
·1-8
·
IF 14.919
Huang Chunmei,Mutailipu Miriding,Zhang Fangfang,Griffith Kent J.,Hu Cong,Yang Zhihua,Griffin John M.,Poeppelmeier Kenneth R.,Pan Shilie
More than 3900 crystalline borates, including borate minerals and synthetic inorganic borates, in addition to a wealth of industrially-important boron-containing glasses, have been discovered and characterized. Of these compounds, 99.9 % contain only the traditional triangular BO 3 and tetrahedral BO 4 units, which polymerize into superstructural motifs. Herein, a mixed metal K 5 Ba 2 (B 10 O 17 ) 2 (BO 2 ) with linear BO 2 structural units was obtained, pushing the boundaries of structural diversity and providing a direct strategy toward the maximum thresholds of birefringence for optical materials design. 11 B solid-state nuclear magnetic resonance (NMR) is a ubiquitous tool in the study of glasses and optical materials; here, density functional theory-based NMR crystallography guided the direct characterization of BO 2 structural units. The full anisotropic shift and quadrupolar tensors of linear BO 2 were extracted from K 5 Ba 2 (B 10 O 17 ) 2 (BO 2 ) containing BO 2 , BO 3 , and BO 4 and serve as guides to the identification of this powerful moiety in future and, potentially, previously-characterized borate minerals, ceramics, and glasses.
研究领域:
无机化学
·
材料科学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2023
·Vol. 25
·期 19
·2939-2945
·
IF 3.1
Jingdong Yan,Dongdong Chu,Fangfang Zhang,Zhihua Yang,Shilie Pan,Xueling Hou
By the introduction of trivalent rare-earth metal-centered polyhedra [LnO6F4] (Ln = La, Gd) into alkali metal sulfates, two novel sulfate fluorides, NaLn2(SO4)2F3 (Ln = La, Gd), were successfully synthesized via a high-temperature solution method in sealed quartz tubes. The two compounds are isomorphic and feature a structure composed of [LnO6F4] (Ln = La, Gd) polyhedra, [NaO4F3] polyhedra, and [SO4] groups. The UV-vis-NIR diffuse reflection spectra, infrared spectra, and thermal stability are also presented. Meanwhile, theoretical calculations reveal that NaLa2(SO4)2F3 has a moderate birefringence (0.041 at 1064 nm) which is significantly improved compared with Na2SO4. And the enhancement of birefringence can be ascribed to the introduction of rare-earth metal-centered polyhedra by a real space atom-cutting method. This work shows that the introduction of trivalent rare-earth metal-centered polyhedra is one of the effective strategies for bolstering the birefringence performance of non-π-conjugated sulfate systems.
研究领域:
材料科学
·
光学材料
·
无机化学
✓ 已验证
DOI
高影响因子
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