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Pressure-induced emission(PIE)in halide perovskites toward promising applications in scintillators and solid-state lighting

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Aggregate 2024年第1期5卷 9-15页

作者： Wenya Zhao guanjun xiao Bo Zou State Key Laboratory of Superhard Materials College of PhysicsJilin UniversityChangchunChina

High-pressure chemistry has provided a huge boost to the development of scientific ***-induced emission(PIE)in halide perovskites is gradually showing its unique charm in both pressure sensing and optoelectronic device ***,the PIE retention of halide perovskites under ambient conditions is of great commercial ***,we mainly focus on the potential applications of PIE and PIE retention in metal halide perovskites for scintillators and solid-state *** on the performance requirements of scintillator and single-component white light-emitting diodes(WLEDs),the significance of PIE and PIE retention is critically clarified,aiming to design and synthesize materials used for high-performance optoelectronic *** perspective not only demonstrates promising applications of PIE in the fields of scintillators and WLEDs,but also provides potential applications in display imaging and anti-counterfeiting of PIE ***,solving the scientific disputes that exist under ambient conditions is also simply discussed as an outlook by introducing high-pressure dimension to produce PIE.

关键词： halide perovskites high pressure light-emitting diode pressure-induced emission scintillators solidstate lighting

High pressure supramolecular chemistry

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Chinese Science Bulletin 2014年第36期59卷 5258-5268页

作者： Kai Wang Shourui Li xiao Tan guanjun xiao Bingbing Liu Bo Zou State Key Laboratory of Superhard Materials Jilin University

High pressure supramolecular chemistry is a developing interdisciplinary field. The use of high pressure for the study and fabrication of supramolecular systems has been explored only in the past few years. Such studies would shed light on the nature of the structures and functions of the complex supramolecular architectures. In this review, systematic progress made in this field is introduced based on the recent achievements. Special attention is paid to pressure-driven novel properties and functions of supramolecular assemblies resulting from the changes of molecular conformations, intermolecular interactions and supramolecular arrangements under high pressure.

关键词：超分子化学高压力超分子结构超分子体系超分子组装交叉学科分子构象相互作用

Unravelling a solution-based formation of single- crystalline kinked wurtzite nanowires： The case of MnSe

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Nano Research 2017年第7期10卷 2311-2320页

作者： Xinyi Yang Bo Zhou Chuang Liu Yongming Sui guanjun xiao Yingjin wei Xin Wang Bo Zou State Key Laboratory of Superhard Materials Jilin University Changchun 130012 China Laboratory of Physics and Technology for Advanced Barteries (Ministry of Education) Jilin University Changchun 130012 China College of Physics Jilin University Changchun 130012 China

The search for a novel strategy to sculpt semiconductor nanowires （NWs） at the atomistic scale is crucial for the development of new paradigms in optics, electronics, and spintronics. Thus far, the fabrication of single-crystalline kinked semiconductor NWs has been achieved mainly through the vapor-liquid-solid growth technique. In this study, we developed a new strategy for sculpting single-crystalline kinked wurtzite （WZ） MnSe NWs by triggering the nonpolar axial-oriented growth, thereby switching--at the atomistic scale---the NW growth orientation along the nonpolar axes in a facile solution-based procedure. This presents substantial challenges owing to the dominant polar c axis growth in the solution-based synthesis of one-dimensional WZ nanocrystals. More significantly, the ability to continuously switch the nonpolar axial-growth orientation allowed us to craft the kinking landscape of types 150°, 120°, 90°, and 60°. A probabilistic analysis of kinked MnSe NWs reveals the correlations of the synergy and interplay between these two sets of nonpolar axial growth-orientation switching, which determine the actual kinked motifs. Furthermore, discriminating the side-facet structures of the kinked NWs significantly strengthened the spatially selected interaction of Au nanoparticles. We envisage that such a facile solution-based strategy can be useful for synthesizing other single-crystalline kinked WZ-type transition-metal dichalcogenide NWs to develop novel functional materials with finely tuned properties.

关键词： kinked nanowires single-crystalline nonpolar axial growth wurtzite MnSe

Whether or Not Emission of Cs4PbBr6 Nanocrystals:High-Pressure Experimental Evidence

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CCS Chemistry 2020年第2期2卷 71-80页

作者： Zhiwei Ma Fangfang Li Dianlong Zhao guanjun xiao Bo Zou State Key Laboratory of Superhard Materials College of PhysicsJilin UniversityChangchun 130012China Key Laboratory of Physics and Technology for Advanced Batteries(Ministry of Education) College of PhysicsJilin UniversityChangchun 130012China

The origin of green emission in the zero-dimensional(0D)perovskite Cs4PbBr6 nanocrystals(NCs)remains a considerable ***,an approach involving a combination of high-pressure experiments and theoretical simulation was employed to elucidate the controversial origin of photoluminescence from emissive Cs4PbBr6 NCs(E416).Results obtained from first-principles density functional theory(DFT)calculations,as implemented in the Vienna ab initio simulation package codes,implied that the photoluminescence energies from bromine vacancy decreased persistently with ***,the photoluminescence energies tended to decrease in the low-pressure region,followed by an increase beyond∼1.4 *** the emergent disagreement between the first-principles calculation and highpressure experiment excludes the possibility of vacancy-tuning,the consistent change observed in the pressure-dependent emission between E416 and CsPbBr_(3) NCs offered a reliable interpretation for the occurrence of green emission from a CsPbBr_(3) impurity embedded in the Cs4PbBr6 *** comprehensive analysis demonstrated that the strong green emission of E416 NCs originated from the impurity CsPbBr_(3) NCs embedded in Cs4PbBr6 *** study represents a significant step forward to a deeper understanding of the emissive origins of Cs4PbBr6 NCs and promotes the application of this novel strategy in light-emitting devices.

关键词： zero-dimensional perovskite nanocrystal photoluminescence high pressure impurity CsPbBr_(3)

Stability and band gap engineering of silica-confined lead halide perovskite nanocrystals under high pressure

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Geoscience Frontiers 2021年第2期12卷 957-963页

作者： Ruijing Fu Yaping Chen Lingrui Wang Zhiwei Ma Pengfei Lv Ying Song Songrui Yang guanjun xiao Bo Zou State Key Laboratory of Superhard Materials College of PhysicsJilin UniversityChangchun130012China Key Laboratory of Materials Physics of Ministry of Education School of Physics and EngineeringZhengzhou UniversityZhengzhou450001China

SiO_(2)is the major mineral substance in the upper mantle of the ***,studies of the silica-coated materials under high-pressure are essential to explore the physical and chemical properties of the upper *** silica-confined CsPbBr_(3)nanocrystals(NCs)have recently attracted much attention because of the improved photoluminescence(PL)quantum yield,owing to the protection of silica ***,it remains considerable interest to further explore the relationship between optical properties and the structure of CsPbBr_(3)@SiO_(2)*** systemically studied the structural and optical properties of the CsPbBr_(3)@SiO_(2)NCs under high pressure by using diamond anvil cell(DAC).The discontinuous changes of PL and absorption spectra occurred at~1.40 *** X-ray diffraction(XRD)studies of CsPbBr_(3)@SiO_(2)NCs under high pressure indicated an isostructural phase transformation at about 1.36 GPa,owing to the pressure-induced tilting of the Pb-Br *** isothermal bulk moduli for two phases are estimated about 60.0 GPa and 19.2 GPa by fitting the equation of ***,the transition pressure point of CsPbBr_(3)@SiO_(2)NCs is slightly higher than that of pristine CsPbBr_(3)NCs,which attributed to the buffer effect of coating silica *** results indicate that silica shell is able to enhance the stabilization without changing the relationship between optical properties and structure of CsPbBr_(3)*** results were fascinated to model the rock metasomatism in the upper mantle and provided a new‘lithoprobe’for detecting the upper mantle.

关键词： Core-shell Perovskite CsPbBr3@SiO2 nanocrystals DAC High pressure Isostructural phase transformation

Disulfide Crosslinking-Induced Aggregation:Towards Solid-State Fluorescent Carbon Dots with Vastly Different Emission Colors

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Chinese Journal of Chemistry 2023年第9期41卷 1007-1014页

作者： Rui Fu Haoqiang Song Xingjiang Liu Yongqiang Zhang guanjun xiao Bo Zou Geoffrey I.N.Waterhouse Siyu Lu Green Catalysis Center and College of ChemistryZhengzhou UniversityZhengzhouHenan 450000China State Key Laboratory of Superhard Materials College of PhysicsJilin UniversityChangchunJilin 130012China School of Chemical Sciences The University of AucklandAuckland 1142New Zealand

Solid-state fluorescent multi-color carbon dots(SFM-CDs),prepared using the same precursor(s)without the need for dispersion in a solid matrix,are highly demanded for a wide range of ***,we report a microwave-assisted strategy for the prepara-tion of SFM-CDs with blue,yellow and red emissions within 5 min from the same *** as-prepared B-CDs,Y-CDs,and R-CDs possessed bright fluorescence at 425 nm,550 nm,and 640 nm,and photoluminescence quantum yields(PLQYs)of 54.68%,17.93%,and 2.88%,*** structure of SFM-CDs consisted of 5-oxo-3,5-dihydro-2H-thiazolo[3,2-a]pyridine-7-carboxylic acid(TPCA)immobilized on the surface of a carbon core,with the size of the carbon core and degree of disulfide crosslinking between CDs both increasing on going from the B-CDs to the R-CDs,as verified by mechanochromic *** excellent solid-state fluorescence performance of the SFM-CDs allowed their utilization as the fluorescent converter layer in multi-color LEDs and white LEDs with a high color rendering index.

关键词： Solid-state fluorescence Multicolor Cross-linked aggregation Disulfide bond Carbon dots

Pressure-induced emission from low-dimensional perovskites

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Journal of Semiconductors 2021年第10期42卷 9-12页

作者： Zhiwei Ma guanjun xiao Liming Ding State Key Laboratory of Superhard Materials College of PhysicsJilin UniversityChangchun 130012China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China

White light emitting diodes from a single emitter is of sig-nificance in application of illumination and image display be-cause of avoiding the color instability in devices with mul-tiple emitters[1,2].Recently,as a single emitter,low-dimension-al halide perovskites have drawn great attention for their broadband solid-state lighting based on the radiative recom-bination of self-trapped excitons(STEs)and excellent device stability[3−8].The dimensionality reduction could effectively en-hance the deformability of octahedral framework and thus electron-phonon coupling strength,facilitating exciton ***,low-dimensional perovskites cannot satis-fy the requirement of device commercialization due to the rare achievement of high photoluminescence quantum yield[9].Developing an effective strategy to improve the emis-sion and elucidating the underlying mechanism have be-come an urgent need.

关键词： emitter dimensional illumination

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高压下低维材料的光学特性调控

高压物理学报 2021年第1期35卷 1-9页

作者：肖冠军邹勃吉林大学物理学院超硬材料国家重点实验室吉林长春130012

压力作为独立于物质温度和组分的热力学参量,为物质科学的研究和创新提供了新的维度,已成为发展新概念、创造新理论及探索新材料的重要源泉。本文主要概述了作者近年来在高压下低维材料的光学特性调控方面所取得的一些进展。通过压力改... 详细信息

压力作为独立于物质温度和组分的热力学参量,为物质科学的研究和创新提供了新的维度,已成为发展新概念、创造新理论及探索新材料的重要源泉。本文主要概述了作者近年来在高压下低维材料的光学特性调控方面所取得的一些进展。通过压力改变激子结合能和卤素八面体的扭曲行为,实现了低维卤化物钙钛矿纳米材料发光从“0”到“1”的突破,提出了压力诱导发光的概念;通过引入压力效应,利用压力对纳米材料表面配体的调控,改变了表面配体与CdSe量子点的相互作用和能级耦合,促进了Hirshfeld电荷转移,从而实现了CdSe量子点的荧光大幅度增强近一个数量级;借助高压手段调控能带结构,成功实现了CdSe/CdS半导体纳米晶由准Ⅱ型核壳结构向Ⅰ型核壳结构的构型转变。上述工作加深了对发光材料在极端压缩条件下构效关系的深入理解和认识,研究成果为设计和制备具有特定功能的低维材料提供了新方法。

关键词：高压压力诱导发光带隙调控金属卤素钙钛矿硒化镉纳米晶

Pressure-dependent optical behaviors of colloidal CdSe nanoplatelets

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Pressure-dependent optical behaviors of colloidal CdSe nanop...