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Pressure-Induced Distinct Self-Trapped Exciton Emission in Sb^(3+)-Doped Cs_(2)NaInCl_(6)Double Perovskite
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作者 冯友佳 陈亚平 +10 位作者 王乐瑶 王家祥 常断华 袁亦方 武敏 付瑞净 张丽丽 王庆林 王凯 郭海中 王玲瑞 《Chinese Physics Letters》 SCIE EI CAS CSCD 2024年第6期18-43,共26页
The Cs_(2)NaInCl_(6) double perovskite is one of the most promising lead-free perovskites due to its exceptional stability and straightforward synthesis.However,it faces challenges related to inefficient photoluminesc... The Cs_(2)NaInCl_(6) double perovskite is one of the most promising lead-free perovskites due to its exceptional stability and straightforward synthesis.However,it faces challenges related to inefficient photoluminescence.Doping and high pressure are employed to tailor the optical properties of Cs_(2)NaInCl_(6).Herein,Sb^(3+)doped Cs_(2)NaInCl_(6)(Sb^(3+):Cs_(2)NaInCl_(6)) was synthesized and it exhibits blue emission with a photoluminescence quantum yield of up to 37.3%.Further,by employing pressure tuning,a blue stable emission under a very wide range from 2.7 GPa to 9.8 GPa is realized in Sb^(3+):Cs_(2)NaInCl_(6).Subsequently,the emission intensity of Sb^(3+):Cs_(2)NaInCl_(6) experiences a significant increase(3.3 times)at 19.0 GPa.It is revealed that the pressure-induced distinct emissions can be attributed to the carrier self-trapping and detrapping between Cs_(2)NaInCl_(6) and Sb^(3+).Notably,the lattice compression in the cubic phase inevitably modifies the band gap of Sb^(3+):Cs_(2)NaInCl_(6).Our findings provide valuable insights into effects of the high pressure in further boosting unique emission characteristics but also offer promising opportunities for development of doped double perovskites with enhanced optical functionalities. 展开更多
关键词 synthesis PEROVSKITE TRAPPING
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外场对拓扑相变氧化物薄膜物性的调控研究进展
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作者 孙雨婷 李明明 +3 位作者 王玲瑞 樊贞 郭尔佳 郭海中 《物理学报》 SCIE EI CAS CSCD 北大核心 2023年第9期2-11,共10页
钙钛矿型过渡金属氧化物在外场激励下可以通过得失氧离子发生显著的结构拓扑相变,同时伴随着输运、磁性、光学等物性的巨大变化,是近年来被重点关注的研究体系,在固态氧化物燃料电池、氧气传感器、催化活性、智能光学窗口以及神经形态... 钙钛矿型过渡金属氧化物在外场激励下可以通过得失氧离子发生显著的结构拓扑相变,同时伴随着输运、磁性、光学等物性的巨大变化,是近年来被重点关注的研究体系,在固态氧化物燃料电池、氧气传感器、催化活性、智能光学窗口以及神经形态计算器件中具有巨大的应用前景.本工作回顾了近年来国内外研究小组在拓扑相变氧化物薄膜及其物性调控方面的工作进展,详细介绍了这类典型薄膜材料在应力场、电场、光场、温度场等外场激励下呈现出的新奇物性,并讨论了其基本物理机制.本综述旨在进一步认识此类材料中的电荷、晶格、轨道等量子序之间的微观耦合机制及其与宏观物性的关联,相关研究有望为基于功能氧化物的高灵敏度、弱场响应的电子器件提供新材料、新途径和新思路. 展开更多
关键词 拓扑结构相变 氧化物薄膜 氧空位 外场调控
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高压下碲基双钙钛矿Cs_(2)TeBr_(6)的结构及光学性质
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作者 吴学仟 王玲瑞 +2 位作者 袁亦方 马良 郭海中 《高压物理学报》 CAS CSCD 北大核心 2023年第5期19-26,共8页
碲基双钙钛矿材料具有光电特性良好、带隙可调、环境友好等优点,已成为一种应用潜力巨大的光吸收材料。为进一步调控碲基双钙钛矿材料的光学性能,选取了一种典型的碲基双钙钛矿Cs_(2)TeBr_(6),利用金刚石对顶砧高压装置及多种原位高压... 碲基双钙钛矿材料具有光电特性良好、带隙可调、环境友好等优点,已成为一种应用潜力巨大的光吸收材料。为进一步调控碲基双钙钛矿材料的光学性能,选取了一种典型的碲基双钙钛矿Cs_(2)TeBr_(6),利用金刚石对顶砧高压装置及多种原位高压测量手段,对其结构与性能的关系进行了深入研究。实验结果表明,在0~51.0 GPa压力范围内,Cs_(2)TeBr_(6)的晶体结构发生了从立方相(Fm3m)到四方相(P4/mnc)的结构相变,相变由高压下八面体[TeBr_(6)]^(4-)的倾斜变形所致。同时发现,高压下Cs_(2)TeBr_(6)的带隙随压力的升高而减小,并在14.0 GPa附近出现拐点,拐点的出现意味着结构相变开始。研究结果有助于建立Cs_(2)TeBr_(6)的晶体结构与光学性质之间的关系,为调控碲基钙钛矿的物性提供非常有价值的参考。 展开更多
关键词 碲基双钙钛矿 Cs_(2)TeBr_(6) 高压 相变 带隙调控
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High-Temperature Superconductivity in Doped Boron Clathrates
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作者 马良 王玲瑞 +2 位作者 袁亦方 郭海中 王洪波 《Chinese Physics Letters》 SCIE EI CAS CSCD 2023年第8期41-45,共5页
The recent discoveries of near-room-temperature superconductivity in clathrate hydrides present compelling evidence for the reliability of theory-orientated conventional superconductivity.Nevertheless,the harsh pressu... The recent discoveries of near-room-temperature superconductivity in clathrate hydrides present compelling evidence for the reliability of theory-orientated conventional superconductivity.Nevertheless,the harsh pressure conditions required to maintain such high T_(c)limit their practical applications.To address this challenge,we conducted extensive first-principles calculations to investigate the doping effect of the recently synthesized LaB_(8)clathrate,intending to design high-temperature superconductors at ambient pressure.Our results demonstrate that these clathrates are highly promising for high-temperature superconductivity owing to the coexistence of rigid boron covalent networks and the tunable density of states at the Fermi level.Remarkably,the predicted T_(c)of BaB_(8)could reach 62 K at ambient pressure,suggesting a significant improvement over the calculated T_(c)of 14 K in LaB_(8).Moreover,further calculations of the formation enthalpies suggest that BaB_(8)could be potentially synthesized under high-temperature and high-pressure conditions.These findings highlight the potential of doped boron clathrates as promising superconductors and provide valuable insights into the design of light-element clathrate superconductors. 展开更多
关键词 BORON AMBIENT SUPERCONDUCTORS
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高压下有机-无机杂化钙钛矿CH_3NH_3PbI_3的结构及光学性质研究 被引量:6
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作者 郭宏伟 刘然 +5 位作者 王玲瑞 崔金星 宋波 王凯 刘冰冰 邹勃 《物理学报》 SCIE EI CAS CSCD 北大核心 2017年第3期41-49,共9页
近年来,随着有机-无机杂化钙钛矿太阳能电池的飞速发展,对此类材料基本物性的探索引起了科学家们的广泛关注.本文利用金刚石对顶砧装置对甲胺基碘化铅(CH_3NH_3PbI_3)进行高压实验,研究了室温下压力诱导CH_3NH_3PbI_3的结构变化以及压... 近年来,随着有机-无机杂化钙钛矿太阳能电池的飞速发展,对此类材料基本物性的探索引起了科学家们的广泛关注.本文利用金刚石对顶砧装置对甲胺基碘化铅(CH_3NH_3PbI_3)进行高压实验,研究了室温下压力诱导CH_3NH_3PbI_3的结构变化以及压力对其光学性质的调控,实验最高压力为7 GPa.原位高压同步辐射X射线衍射实验结果显示,CH_3NH_3PbI_3样品在0.3 GPa由四方相转变为正交相,在4 GPa左右开始非晶化.结合原位高压吸收和荧光光谱,分析了压力对CH_3NH_3PbI_3带隙大小的调控作用.进一步利用原位高压拉曼光谱和红外光谱实验研究了CH_3NH_3PbI_3晶体中有机阳离子(CH_3NH_3^+)在高压下的行为.完全卸压后,样品恢复到加压前的初始状态.研究结果可为深入了解有机-无机杂化钙钛矿的光学性质和结构稳定性提供一些信息. 展开更多
关键词 金刚石对顶砧 压致相变与非晶化 带隙 氢键
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高压下非铅双钙钛矿Cs2TeCl6的结构和光学性质 被引量:2
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作者 姚盼盼 王玲瑞 +1 位作者 王家祥 郭海中 《物理学报》 SCIE EI CAS CSCD 北大核心 2020年第21期365-371,共7页
无毒环保且稳定的非铅双钙钛矿材料因具有和铅基钙钛矿相似的三维结构,被认为是铅基钙钛矿材料最有前景的替代品之一.本文采用溶液法制备了一种新型非铅双钙钛矿材料Cs2TeCl6,利用金刚石对顶砧高压装置和高压原位同步辐射X射线衍射、紫... 无毒环保且稳定的非铅双钙钛矿材料因具有和铅基钙钛矿相似的三维结构,被认为是铅基钙钛矿材料最有前景的替代品之一.本文采用溶液法制备了一种新型非铅双钙钛矿材料Cs2TeCl6,利用金刚石对顶砧高压装置和高压原位同步辐射X射线衍射、紫外-可见吸收光谱技术,对其在高压下的晶体结构、光学带隙和电子结构演化进行了深入研究.研究表明,在实验压力范围(0—50.0 GPa)内Cs2TeCl6晶体结构并未发生改变,始终保持Fm-3m的结构对称性,表明该样品具有良好的稳定性;Cs2TeCl6的体积随压力的增加曲线变化比较平滑,通过三阶Birch-Mumaghan状态方程得到了体弹模量B0=(18.77±2.88)GPa;Cs2TeCl6为间接带隙半导体,在0—20.0 GPa范围内其光学带隙随着压力的增大逐渐减小,这与高压下八面体[TeCl6]^2–的收缩相关.完全卸压后,Cs2TeCl6恢复到加压前的初始状态.研究结果为深入理解此类材料的晶体结构和光学性质提供科学依据,并为调控其晶格结构、光学带隙及电子结构提供思路. 展开更多
关键词 非铅双钙钛矿 金刚石对顶砧 高压 带隙
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Structural evolution and bandgap modulation of layeredβ-GeSe_(2)single crystal under high pressure
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作者 Hengli Xie Jiaxiang Wang +6 位作者 Lingrui Wang Yong Yan Juan Guo Qilong Gao Mingju Chao Erjun Liang Xiao Ren 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第7期428-435,共8页
Germanium diselenide(GeSe_(2))is a promising candidate for electronic devices because of its unique crystal structure and optoelectronic properties.However,the evolution of lattice and electronic structure ofβ-GeSe_(... Germanium diselenide(GeSe_(2))is a promising candidate for electronic devices because of its unique crystal structure and optoelectronic properties.However,the evolution of lattice and electronic structure ofβ-GeSe_(2)at high pressure is still uncertain.Here we prepared high-qualityβ-GeSe_(2)single crystals by chemical vapor transfer(CVT)technique and performed systematic experimental studies on the evolution of lattice structure and bandgap ofβ-GeSe_(2)under pressure.High-precision high-pressure ultra low frequency(ULF)Raman scattering and synchrotron angle-dispersive x-ray diffraction(ADXRD)measurements support that no structural phase transition exists under high pressure up to 13.80 GPa,but the structure ofβ-GeSe_(2)turns into a disordered state near 6.91 GPa and gradually becomes amorphous forming an irreversibly amorphous crystal at 13.80 GPa.Two Raman modes keep softening abnormally upon pressure.The bandgap ofβ-GeSe_(2)reduced linearly from 2.59 eV to 1.65 eV under pressure with a detectable narrowing of 36.5%,and the sample under pressure performs the piezochromism phenomenon.The bandgap after decompression is smaller than that in the atmospheric pressure environment,which is caused by incomplete recrystallization.These results enrich the insight into the structural and optical properties ofβ-GeSe_(2)and demonstrate the potential of pressure in modulating the material properties of two-dimensional(2D)Ge-based binary material. 展开更多
关键词 high pressure structural phase transition Raman spectroscopy scattering layered material
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