Nowadays, the soar of photovoltaic performance of perovskite solar cells has set off a fever in the study of metal halide perovskite materials. The excellent optoelectronic properties and defect tolerance feature allo...Nowadays, the soar of photovoltaic performance of perovskite solar cells has set off a fever in the study of metal halide perovskite materials. The excellent optoelectronic properties and defect tolerance feature allow metal halide perovskite to be employed in a wide variety of applications. This article provides a holistic review over the current progress and future prospects of metal halide perovskite materials in representative promising applications, including traditional optoelectronic devices(solar cells, light-emitting diodes, photodetectors, lasers), and cutting-edge technologies in terms of neuromorphic devices(artificial synapses and memristors) and pressure-induced emission. This review highlights the fundamentals, the current progress and the remaining challenges for each application, aiming to provide a comprehensive overview of the development status and a navigation of future research for metal halide perovskite materials and devices.展开更多
SiO_(2)is the major mineral substance in the upper mantle of the earth.Therefore,studies of the silica-coated materials under high-pressure are essential to explore the physical and chemical properties of the upper ma...SiO_(2)is the major mineral substance in the upper mantle of the earth.Therefore,studies of the silica-coated materials under high-pressure are essential to explore the physical and chemical properties of the upper mantle.The 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 shell.However,it remains considerable interest to further explore the relationship between optical properties and the structure of CsPbBr_(3)@SiO_(2)NCs.We 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 GPa.Synchrotron 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 octahedra.The isothermal bulk moduli for two phases are estimated about 60.0 GPa and 19.2 GPa by fitting the equation of state.Besides,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 shell.The results indicate that silica shell is able to enhance the stabilization without changing the relationship between optical properties and structure of CsPbBr_(3)NCs.Our results were fascinated to model the rock metasomatism in the upper mantle and provided a new‘lithoprobe’for detecting the upper mantle.展开更多
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 s...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 self-trapping.However,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.展开更多
High-pressure chemistry has provided a huge boost to the development of scientific community.Pressure-induced emission(PIE)in halide perovskites is gradually showing its unique charm in both pressure sensing and optoe...High-pressure chemistry has provided a huge boost to the development of scientific community.Pressure-induced emission(PIE)in halide perovskites is gradually showing its unique charm in both pressure sensing and optoelectronic device applications.Moreover,the PIE retention of halide perovskites under ambient conditions is of great commercial value.Herein,we mainly focus on the potential applications of PIE and PIE retention in metal halide perovskites for scintillators and solid-state lighting.Based 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 devices.This 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 materials.Furthermore,solving the scientific disputes that exist under ambient conditions is also simply discussed as an outlook by introducing high-pressure dimension to produce PIE.展开更多
Pressure, as a thermodynamic parameter, provides an appropriate method to detect weak intermolecular interactions. The C–H···H–B dihydrogen bond is so weak that the experimental evidence of this inter...Pressure, as a thermodynamic parameter, provides an appropriate method to detect weak intermolecular interactions. The C–H···H–B dihydrogen bond is so weak that the experimental evidence of this interaction is still limited. A combination of in situ high pressure Raman spectra and angle-dispersive X-ray diffraction(ADXRD) experiments was utilized to explore the dihydrogen bonds in dimethylamine borane(DMAB). Both Raman and ADXRD measurements suggested that the crystal structure of DMAB is stable in the pressure region from 1 atm(1 atm=1.01325×10~5 Pa) to 0.54 GPa. The red shift of CH stretching and CH_3 distortion modes gave strong evidence for the existence of C–H···H–B dihydrogen bonds. Further analysis of Raman spectra and Hirshfeld surface confirmed our proposal. This work provided a deeper understanding of dihydrogen bonds.And we wish that high pressure could be applied to identify other unconfirmed hydrogen or dihydrogen bond.展开更多
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 applications.Herein,we report a mi...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 applications.Herein,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 precursors.The 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%,respectively.The 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 experiments.The 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.展开更多
The origin of green emission in the zero-dimensional(0D)perovskite Cs4PbBr6 nanocrystals(NCs)remains a considerable debate.Herein,an approach involving a combination of high-pressure experiments and theoretical simula...The origin of green emission in the zero-dimensional(0D)perovskite Cs4PbBr6 nanocrystals(NCs)remains a considerable debate.Herein,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 pressure.Experimentally,the photoluminescence energies tended to decrease in the low-pressure region,followed by an increase beyond∼1.4 GPa.While 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 matrix.Further comprehensive analysis demonstrated that the strong green emission of E416 NCs originated from the impurity CsPbBr_(3) NCs embedded in Cs4PbBr6 matrix.Our 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.展开更多
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 studi...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.展开更多
Photoluminescence intensity is a crucial parameter for evaluating the performance of optoelectronic devices.To date,efforts to optimize the emission properties of luminescent materials are continuously implemented,suc...Photoluminescence intensity is a crucial parameter for evaluating the performance of optoelectronic devices.To date,efforts to optimize the emission properties of luminescent materials are continuously implemented,such as surface passivation with ligands or electronic structure modulation using heterojunctions.展开更多
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 si...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.展开更多
The interaction between organic and inorganic components in metal hybrid perovskites fundamentally determines the intrinsic optoelectronic performance.However,the underlying interaction sites have still remained elusi...The interaction between organic and inorganic components in metal hybrid perovskites fundamentally determines the intrinsic optoelectronic performance.However,the underlying interaction sites have still remained elusive,especially for those non-hydrogen-bonded hybrid perovskites,thus largely impeding materials precise design with targeted properties.Herein,high pressure is utilized to elucidate the interaction mechanism between organic and inorganic components in the as-synthesized one-dimensional hybrid metal halide(DBU)PbBr_(3)(DBU=1,8-diazabicyclo[5.4.0]undec-7-ene).The interaction sites are identified to be the N from DBU and the Br from inorganic framework by the indicative of enhanced Raman mode under high pressure.The change in interaction strength is indeed derived from the pressure modulation on both distance and spatial arrangement of the nearest Br and N,rather than traditional hydrogen-bonding effect.Furthermore,the enhanced interaction increased charge transfer,resulting in a cyan emission with photoluminescence quantum yields(PLQYs)of 86.6%.The enhanced cyan emission is particularly important for underwater communication due to the much less attenuation in water than at other wavelength emissions.This study provides deep insights into the underlying photophysical mechanism of non-hydrogen-bonded hybrid metal halides and is expected to impart innovative construction with superior performance.展开更多
基金the National Key Research and Development Program of China (2022YFB3803300)the open research fund of Songshan Lake Materials Laboratory (2021SLABFK02)the National Natural Science Foundation of China (21961160720)。
文摘Nowadays, the soar of photovoltaic performance of perovskite solar cells has set off a fever in the study of metal halide perovskite materials. The excellent optoelectronic properties and defect tolerance feature allow metal halide perovskite to be employed in a wide variety of applications. This article provides a holistic review over the current progress and future prospects of metal halide perovskite materials in representative promising applications, including traditional optoelectronic devices(solar cells, light-emitting diodes, photodetectors, lasers), and cutting-edge technologies in terms of neuromorphic devices(artificial synapses and memristors) and pressure-induced emission. This review highlights the fundamentals, the current progress and the remaining challenges for each application, aiming to provide a comprehensive overview of the development status and a navigation of future research for metal halide perovskite materials and devices.
基金the National Science Foundation of China(Grant Nos.21725304,11774125,and 21673100)the Chang Jiang Scholars Program of China(Grant No.T2016051)+3 种基金Changbai Mountain Scholars Program(Grant No.2013007)National Defense Science and Technology Key Laboratory Fund(Grant No.6142A0306010917)Jilin Provincial Science&Technology Development Program(Grant No.20190103044JH)Scientific Research Planning Project of the Education Department of Jilin Province(Grant No.JJKH20180118KJ)。
文摘SiO_(2)is the major mineral substance in the upper mantle of the earth.Therefore,studies of the silica-coated materials under high-pressure are essential to explore the physical and chemical properties of the upper mantle.The 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 shell.However,it remains considerable interest to further explore the relationship between optical properties and the structure of CsPbBr_(3)@SiO_(2)NCs.We 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 GPa.Synchrotron 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 octahedra.The isothermal bulk moduli for two phases are estimated about 60.0 GPa and 19.2 GPa by fitting the equation of state.Besides,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 shell.The results indicate that silica shell is able to enhance the stabilization without changing the relationship between optical properties and structure of CsPbBr_(3)NCs.Our results were fascinated to model the rock metasomatism in the upper mantle and provided a new‘lithoprobe’for detecting the upper mantle.
基金the National Key Research and Development Program of China(2019YFE0120300 and 2017YFA0206600)the National Natural Science Foundation of China(21725304,11774125,51773045,21772030,51922032 and 21961160720)the Fundamental Research Funds for the Central Universities.
文摘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 self-trapping.However,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.
基金Jilin Provincial Science and Technology Development Program,Grant/Award Number:20220101002JCNational Natural Science Foundation of China,Grant/Award Number:12174144Fundamental Research Funds for the Central Universities。
文摘High-pressure chemistry has provided a huge boost to the development of scientific community.Pressure-induced emission(PIE)in halide perovskites is gradually showing its unique charm in both pressure sensing and optoelectronic device applications.Moreover,the PIE retention of halide perovskites under ambient conditions is of great commercial value.Herein,we mainly focus on the potential applications of PIE and PIE retention in metal halide perovskites for scintillators and solid-state lighting.Based 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 devices.This 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 materials.Furthermore,solving the scientific disputes that exist under ambient conditions is also simply discussed as an outlook by introducing high-pressure dimension to produce PIE.
基金supported by the National Natural Science Foundation of China(21725304,21673100,91227202,11774120,11774125)the Chang Jiang Scholars Program of China(T2016051)+3 种基金Changbai Mountain Scholars Program(2013007)Program for Innovative Research Team(in Science and Technology)in University of Jilin Province and Graduate Innovation Fund of Jilin University(2017050)ADXRD experiments were performed at Beijing Synchrotron Radiation Facility(4W2 beamline)which is supported by Chinese Academy of Sciences(KJCX2-SW-N20,KJCX2-SW-N03)
文摘Pressure, as a thermodynamic parameter, provides an appropriate method to detect weak intermolecular interactions. The C–H···H–B dihydrogen bond is so weak that the experimental evidence of this interaction is still limited. A combination of in situ high pressure Raman spectra and angle-dispersive X-ray diffraction(ADXRD) experiments was utilized to explore the dihydrogen bonds in dimethylamine borane(DMAB). Both Raman and ADXRD measurements suggested that the crystal structure of DMAB is stable in the pressure region from 1 atm(1 atm=1.01325×10~5 Pa) to 0.54 GPa. The red shift of CH stretching and CH_3 distortion modes gave strong evidence for the existence of C–H···H–B dihydrogen bonds. Further analysis of Raman spectra and Hirshfeld surface confirmed our proposal. This work provided a deeper understanding of dihydrogen bonds.And we wish that high pressure could be applied to identify other unconfirmed hydrogen or dihydrogen bond.
基金supported by the National Natural Science Foundation of China(52122308,21905253,51973200,52203244,21725304)the Natural Science Foundation of Henan Province(202300410372)the China Postdoctoral Science Foundation(2022M712868).
文摘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 applications.Herein,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 precursors.The 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%,respectively.The 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 experiments.The 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.
基金the National Science Foundation of China(nos.21725304,11774125,and 21673100)the Chang Jiang Scholars Program of China(no.T2016051)+1 种基金Changbai Mountain Scholars Program(no.2013007)Jilin Provincial Science&Technology Development Program(no.20190103044JH).
文摘The origin of green emission in the zero-dimensional(0D)perovskite Cs4PbBr6 nanocrystals(NCs)remains a considerable debate.Herein,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 pressure.Experimentally,the photoluminescence energies tended to decrease in the low-pressure region,followed by an increase beyond∼1.4 GPa.While 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 matrix.Further comprehensive analysis demonstrated that the strong green emission of E416 NCs originated from the impurity CsPbBr_(3) NCs embedded in Cs4PbBr6 matrix.Our 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.
基金supported by the National Natural Science Foundation of China(91227202,11204101,21073071,51025206)the Research Fund for the Doctoral Program of Higher Education(20120061130006)+2 种基金the National Basic Research Programof China(2011CB808200)China Postdoctoral Science Foundation(2012M511327,2014M550171)the Graduate Innovation Fund of Jilin University(20121041,2014087)
文摘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.
基金supported by the National Key R&D Program of China(2019YFE0120300)the National Natural Science Foundation of China(12174144 and 21725304)Young Elite Scientists Sponsorship Program by CAST(2022QNRC001)。
文摘Photoluminescence intensity is a crucial parameter for evaluating the performance of optoelectronic devices.To date,efforts to optimize the emission properties of luminescent materials are continuously implemented,such as surface passivation with ligands or electronic structure modulation using heterojunctions.
基金This study is supported by the National Natural Sdence Foundation of China （Nos. 91227202, 21673100 and 11504126）, the RFDP （No. 20120061130006）, Changbai Mountain scholars program （No. 2013007）, Program for Innovative Research Team （in Science and Technology） in University of Jilin Province, the China Postdoctoral Science Foundation （No. 2014M561281）.
文摘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.
基金supported by the National Key R&D Program of China(2023YFA1406200)the National Science Foundation of China(12174144 and 12304014)+2 种基金the Jilin Provincial Science&Technology Development Program(20220101002JC)the Graduate Innovation Fund of Jilin University(2024CX201)the Fundamental Research Funds for the Central Universities.
文摘The interaction between organic and inorganic components in metal hybrid perovskites fundamentally determines the intrinsic optoelectronic performance.However,the underlying interaction sites have still remained elusive,especially for those non-hydrogen-bonded hybrid perovskites,thus largely impeding materials precise design with targeted properties.Herein,high pressure is utilized to elucidate the interaction mechanism between organic and inorganic components in the as-synthesized one-dimensional hybrid metal halide(DBU)PbBr_(3)(DBU=1,8-diazabicyclo[5.4.0]undec-7-ene).The interaction sites are identified to be the N from DBU and the Br from inorganic framework by the indicative of enhanced Raman mode under high pressure.The change in interaction strength is indeed derived from the pressure modulation on both distance and spatial arrangement of the nearest Br and N,rather than traditional hydrogen-bonding effect.Furthermore,the enhanced interaction increased charge transfer,resulting in a cyan emission with photoluminescence quantum yields(PLQYs)of 86.6%.The enhanced cyan emission is particularly important for underwater communication due to the much less attenuation in water than at other wavelength emissions.This study provides deep insights into the underlying photophysical mechanism of non-hydrogen-bonded hybrid metal halides and is expected to impart innovative construction with superior performance.
