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Lead-free hybrid two-dimensional double perovskite with switchable dielectric phase transition

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Chinese Chemical Letters 2024年第6期35卷 176-179页

作者： Tian Yang Yi Liu Lina Hua Yaoyao Chen Wuqian Guo Haojie Xu Xi Zeng Changhao Gao Wenjing Li junhua luo Zhihua Sun College of Chemistry Fuzhou UniversityFuzhou 350108China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China

Molecular dielectric switches constitute a type of intelligent materials that are highly coveted for their distinctive advantages of switchable dielectric responses,lightweight,and mechanical ***(2D)hybrid perovskites have demonstrated excellent promise for assembling dielectric switches,in which the dynamic motions of organic moieties afford driving force to trigger switchable dielectric phase ***,we successfully assembled a new lead-free hybrid double perovskite,(CHA)4Cu Bi Br8(1,CHA=cyclohexylammonium),adopting a typical 2D structural motif,which shows dielectric anisotropy and bistable behaviors during the reversible phase transition near T_(c)=378 K(the Curie temperature).That is,its dielectric constants could be switched and tuned between high-dielectric and low-dielectric *** analyses reveal that the ordered-disordered transformation of the organic CHA+moiety and distortion of inorganic framework account for its phase *** result will stimulate further exploration of molecular dielectric switches in this 2D environmentally friendly family.

关键词： Dielectric switch Lead-free Double perovskite Phase transition Symmetry breaking

Recent advances in non-π-conjugated nonlinear optical sulfates with deep-UV absorption edge

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Chinese Journal of Structural Chemistry 2023年第3期42卷 56-63页

作者： Xu Chen Yanqiang Li junhua luo Sangen Zhao College of Chemistry Fuzhou UniversityFuzhouFujian350108China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhouFujian350002China University of Chinese Academy of Sciences Beijing100049China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China FuzhouFujian350108China

Deep-ultraviolet(deep-UV)nonlinear optical(NLO)crystals are of current interest because they play an indis-pensable role in modern scientific *** these crystals was traditionally limited toπ-conjugated systems,such as borates and *** 2019,our group reported two non-π-conjugated sulfates as new sources of deep-UV NLO crystals for the first *** this mini review,we provide a comprehensive overview of the recent development of non-π-conjugated NLO sulfates with deep-UV absorption edge in aspect of synthesis methods,crystal structures,thermal stability,and optical ***,we conclude the crucial structure-property relationships,and further give some prospects for exploring non-π-conjugated NLO sulfates with deep-UV absorption edge with high thermal stability,enhanced second-order NLO effects,birefringence,*** believe that this mini review will not only facilitate researchers to design superior non-π-conjugated NLO sulfates with deep-UV absorption edge but also shed useful insights on the explorations of other non-π-conjugated deep-UV NLO crystal systems.

关键词： Crystal structures Structure-property relationships Deep-UV NLO crystals Sulfates

"刚柔并济"构筑可"劈裂"光的高稳定性晶体材料

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Science Bulletin 2024年第14期69卷 2205-2211页

作者：杜志鹏宋显宇刘维王子怡沙洪源许倩婷周洋李雁强罗军华赵三根 State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China College of Chemistry Fuzhou UniversityFuzhou 350108China Fujian College University of Chinese Academy of SciencesFuzhou 350002China Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China

There is a pressing demand for the development of novel birefringent crystals tailored for compact optical components,especially for crystals exhibiting large birefringence across a range of *** has commonly been achieved by introducing various deformable groups with high polarizability *** this study,we combined both rigid and deformable groups to synthesise a new birefringent crystal,Al_(2)Te_(2)MoO_(10),which demonstrates an exceptional birefringence value of 0.29@550 nm at room *** only is this higher birefringence than that of commercial crystals,but Al_(2)Te_(2)MoO_(10)exhibits excellent birefringence stability over a wide temperature range,from 123 to 503 *** addition,the first-principles theory calculations and structural analyses suggest that although the rigid AlO_(6)groups do not make much contribution to the prominent birefringence,they nonetheless played a role in maintaining the structural anisotropy at elevated *** on these findings,this paper proposes a novel structural design strategy to complement conventional approaches for developing optimal birefringent crystals under various environmental conditions.

关键词： Combining rigid and deformable groups Optical anisotropy Structure-property relationship Birefringent crystal

Ferroelectric perovskite-type films with robust in-plane polarization toward efficient room-temperature chemiresistive sensing

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Fundamental Research 2023年第3期3卷 362-368页

作者： Shiguo Han Guan-E Wang Gang Xu junhua luo Zhihua Sun State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesNo.155 Yangqiao West RoadFuzhou 350002China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China No.155 Yangqiao West RoadFuzhou 350002China University of Chinese Academy of Sciences Chinese Academy of SciencesNo.19A Yuquan RoadBeijing 100039China

Ferroelectric materials have become key components for versatile device applications,and their thin films are highly desirable for integrating the miniaturized *** substantial endeavors,it is still challenging to achieve effective chemiresistive sensing in the ferroelectric ***,for the first time,we have exploited ferroelectric thin films of 2D hybrid perovskite BA_(2)EA_(2)Pb_(3)I_(10)(1),to fabricate the high-performance chemiresistor gas *** spin-coated films of 1 exhibit high orientation and good crystallinity,thus preserving robust in-plane spontaneous polarization(P_(s)~2.0μC/cm^(2))and low electric ***,such ferroelectric filmbased sensors after electric poling enable the dramatic room-temperature sensing responses to NO_(2) gas,including high sensitivity(0.05 ppm^(-1)),extremely low detection limit(1 ppm)and fast responding rate(~6 s).Besides,the chemiresistive responses are remarkably enhanced by threefold(up to 320%)through electric *** is proposed that this behavior closely involves with strong in-plane ferroelectric polarization of 1 that generates a built-in electric field inhibiting the recombination of charge *** far as we know,this ferroelectric-based film chemiresisor is one of the best room-temperature sensors for NO_(2) gas among all the existing candidate *** findings highlight great potential of ferroelectrics toward effective chemiresistive performances,and also establish a bright direction to explore their future device applications.

关键词： Ferroelectric-based films Hybrid perovskite 2D quantum-well In-plane polarization Chemiresistive sensing

Designing a deep-UV nonlinear optical monofluorophosphate

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Science China Chemistry 2022年第9期65卷 1710-1714页

作者： Qingran Ding Xingyu Zhang Zheshuai Lin Zheyao Xiong Yusong Wang Xifa Long Sangen Zhao Maochun Hong junhua luo School of Chemistry and Chemical Engineering Jiangxi Normal UniversityNanchang 330022China Fujian Institute of Research on the Structure of Matter Chinese Academy of SciencesFuzhou 350002China Technical Institute of Physics and Chemistry Chinese Academy of SciencesBeijing 100190China University of Science and Technology of China Hefei 230026China

As structural variants of famous hexagonal tungsten bronzes,hexagonal tungsten oxides(HTO)represent an important family with fascinating functional properties,such as piezoelectric,ferroelectric,pyroelectric,and nonlinear optical(NLO)***,none of them are transparent in the deep-UV spectral region,which limits their ***,we report the first HTO-type monofluorophosphate K_(3)Sc_(3)(PO_(4))(PO_(3)F)_(2)F_(5)(I)with deep-UV *** a monofluorophosphate is NLO-active with a phase-matchable powder second harmonic generation efficiency of 0.9 times that of KH_(2)PO_(4)at 1,064 ***,the UV-Vis reflectance spectrum indicates that it is deep-UV transparent down to 200 *** work pushes the transparent window of NLO materials with HTO-type structures down to the deep-UV spectral region for the first time and opens up a new door for HTO materials.

关键词： monofluorophosphate hexagonal tungsten oxides deep-UV nonlinear optics crystal

A new 2D van der Waals material with air stability and in-plane anisotropy

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Chinese Journal of Structural Chemistry 2023年第7期42卷 9-13页

作者： Han Wang Jinyang Liu Minjuan Li Yanqiang Li Yang Zhou Wei Liu junhua luo Sangen Zhao State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou350002China College of Chemistry and Materials Science Fujian Normal UniversityFuzhou350007China College of Physics and Energy Fujian Normal UniversityFuzhou350117China

*** 2D van der Waals materials possess intriguing features[1],especially optically,such as high nonlinear optical responses[2],broadband spectral response[3],and accessible exciton effects[4].Unlike conventional 2D materials with in-plane isotropy,such as graphene and M0S_(2),2D van der Waals materials with in-plane anisotropic possess in-plane low symmetry structure,inducing the in-plane anisotropic physical ***,they can be easily moved to various substrates without lattice-matching problems.

关键词： properties. plane anisotropic

New cross-section measurements for the (n, 2n), (n, p), and (n, a) reactions on bromine in the 14 MeV region with detailed uncertainty quantification

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Chinese Physics C 2023年第3期47卷 93-106页

作者：贺龙罗均华蒋励 School of Physics and Electromechanical Engineering Hexi UniversityZhangye 734000China Institute of New Energy Hexi UniversityZhangye734000China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China

Measurement of the cross-sections of the ^(79)Br(n,2n)^(78)Br,^(81)Br(n,p)^(81)mSe,^(81)Br(n,α)^(78)As,and ^(79)Br(n,α)^(76)As reactions was performed at specific neutron energies,precisely,13.5±0.2,14.1±0.2,14.4±0.2,and 14.8±0.2 MeV,relative to the standard ^(93)Nb(n,2n)^(92)mNb and ^(27)Al(n,α)^(24)Na reference reactions using offlineγ-ray spectrometry and neutron *** neutrons were generated at the China Academy of Engineering Physics via a ^(3)H(d,n)^(4)He reaction using the K-400 Neutron Generator equipped with a solid ^(3)H-Ti based *** activity of the reaction produce was obtained using a high-purity germanium *** cross-sections of the(n,2n),(n,p),and(n,α)reactions on the bromine isotopes were measured in the 13–15 MeV neutron energy *** covariance analysis approach was employed for a thorough inspection of any uncertainties within the measured cross-section data.A discussion and comparison of the observed outcome were carried out with previously published data,especially with the results of the JENDL-4.0,JEFF-3.3,TENDL-2019,and ENDF/B-VIII.0 data libraries,along with the theoretical excitation function curve derived by employing the TALYS-1.95 *** cross-section restrictions for the investigated processes in the 13–15 MeV neutron energy range will be obtained using the current findings,which will help to raise the caliber of associated ***,the parameters of relevant nuclear reaction models can be verified using this data.

关键词： ^(79,81)Br sotopes 4 MeV neutron (n,2n) (n,p) and(n,a)reactions crss-section covariance analysis

Highly Efficient White-Light Emission Induced by Carboxylic Acid Dimers in a Layered Hybrid Perovskite

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CCS Chemistry 2022年第7期4卷 2491-2497页

作者： Lina Li Wentao Wu Dong Li Chengmin Ji Shisheng Lin Maochun Hong junhua luo State Key Laboratory of Structure Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002 University of the Chinese Academy of Sciences Beijing 100049 Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108 School of Chemistry and Chemical Engineering Jiangxi Normal UniversityNanchang 330022

Broadband white-light emission in metal halides has been intensely explored because of their facile solution processability,structural adjustability,and high color rendering ***,the most reported quantum yields for white-light emission remain low despite great ***,we report a metal-halide layered perovskite,(HOOC_(4)H_(9)NH_(3))_(2)PbBr_(4),showing the typical white-light emission with a highly enhan ced quantumyield up to 21.2% compared to previously reported noncarboxyl layered hybrid perovskites(0.5-9%).Notably,mechanistic studies reveal that the distinctive carboxylic acid dimers largely increase the structure rigidity and in consequence reduce the nonradiative recombination induced by stretching *** the best of our knowledge,this strategy is important in hybrid perovskites,which is effective and propagable to acquire prominent *** work will shed light on the design of highly emissive white-light materials involving intense intermolecular interaction and promote their potential in displaying application.

关键词： white-light emission hybrid perovskite highly enhanced carboxylic acid dimers intermolecular interaction

Maximizing the linear and nonlinear optical responses of alkaline tricyanomelaminate

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Fundamental Research 2023年第6期3卷 974-978页

作者： Yanqiang Li Qingchen Wu Zheshuai Lin Youchao Liu Yang Zhou Xin Chen Minjuan Li Maochun Hong junhua luo Sangen Zhao State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Technical Institute of Physics and Chemistry Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China

High-performance bi-functional materials are in urgent demand for the next-generation integrated optical *** this work,we successfully synthesized the first tricyanomelaminate with bi-functional optical responses,namely Cs_(3)C_(6)N_(9)•H_(2)O(I),from its analogue Na_(3)C_(6)N_(9)•3H_(2)O by a facile ion exchange *** contrast to Na_(3)C_(6)N_(9)•3H_(2)O,I realizes an optimal arrangement of𝜋π-conjugated(C_(6)N_(9))3−anion groups in its crystal *** a result,the second-order nonlinear optical(NLO)response is greatly enhanced from nearly zero of Na_(3)C_(6)N_(9)•3H_(2)O to∼9.8×KH_(2)PO_(4)of ***,I exhibits a giant linear optical anisotropic response(***)of 0.52 at the wavelength of 550 *** responses are almost the largest among the inorganic compounds ofπ-conjugated rings,which indicates that I has great potential as a bi-functional optical *** and theoretical analyses reveal the microscopic origin of excellent optical *** work would attract a lot of interest to the persistently neglected potential of tricyanomelaminates as linear optical and NLO crystals.

关键词： Nonlinear optical response Second harmonic generation Birefringence Tricyanomelaminate Structure-property relationship Inorganic chemistry