Abstract Metal halide perovskites (MHPs) are of great interest for optoelectronics because their high quantum efficiency in solar cells and light-emitting devices. However, exploring an effective strategy to further improve optical activities remains a considerable challenge. Here, we report that nanocrystals (NCs) the initially nonfluorescent zero-dimensional (0D) cesium lead perovskite Cs 4 PbBr 6 exhibit distinct emission under pressure 3.01 GPa. Subsequently, intensity NCs experiences...

Abstract Piezochromic materials, which show color changes resulting from mechanical grinding or external pressure, can be used as mechanosensors, indicators of mechano‐history, security papers, optoelectronic devices, and data storage systems. A class piezochromic materials with unprecedented two‐photon absorptive yellow emissive carbon dots (CDs) was developed for the first time. Applied pressure 0–22.84 GPa caused a noticeable change in luminescence CDs, shifting (557 nm) to blue‐green...

Metal halide perovskites (MHPs) are gaining increasing interest because of their extraordinary performance in optoelectronic devices and solar cells. However, developing an effective strategy for achieving the band-gap engineering MHPs that will satisfy practical applications remains a great challenge. In this study, high pressure is introduced to tailor optical structural properties MHP-based cesium lead bromide nanocrystals (CsPbBr3 NCs), which exhibit excellent thermodynamic stability....

Abstract Photoactivation in CdSe/ZnS quantum dots (QDs) on UV/Vis light exposure improves photoluminescence (PL) and photostability. However, it was not observed fluorescent carbon (CDs). Now, photoactivated fluorescence enhancement fluorine nitrogen co‐doped (F,N‐doped CDs) is presented. At 1.0 atm, the intensity of F,N‐doped CDs increases with UV irradiation (5 s–30 min), accompanied a blue‐shift emission from 586 nm to 550 nm. exhibit when exposed under high pressure (0.1 GPa). show...

Low-dimensional halide perovskites easily suffer from the structural distortion related to significant quantum confinement effects. Organic tin bromide perovskite C4N2H14SnBr4 is a unique one-dimensional (1D) structure in which edge sharing octahedral chains [SnBr42–]∞ are embraced by organic cations C4N2H142+ form bulk assembly of core–shell wires. Some unusual phenomena under high pressure accordingly expected. Here, an intriguing pressure-induced emission (PIE) was successfully achieved...

Abstract A recently created class of inorganic 2D materials, MXenes, has become a subject intensive research. Reducing their dimensionality from to 0D quantum dots (QDs) could result in extremely useful properties and functions. However, this type research is scarce, the reported Ti 3 C 2 MXene QDs (MQDs) have only shown blue fluorescence emission. This work demonstrates facile, high‐output method for preparing bright white emitting MQDs. The resulting product two layers thick with lateral...

Abstract The pressure‐induced emission (PIE) behavior of halide perovskites has attracted widespread attention and potential application in pressure sensing. However, high‐pressure reversibility largely inhibits practical applications. Here, we describe the enhancement non‐doping control color temperature two‐dimensional perovskite (C 6 H 5 CH 2 NH 3 ) PbCl 4 ((PEA) nanocrystals (NCs) through processing. A remarkable times PIE was achieved at a mild 0.4 GPa, which highly associated with...

Comprehensive Summary Solid‐state fluorescent multi‐color carbon dots (SFM‐CDs), prepared using the same precursor(s) without need for dispersion in a solid matrix, are highly demanded wide range of applications. Herein, we report microwave‐assisted strategy preparation SFM‐CDs with blue, yellow and red emissions within 5 min from precursors. The as‐prepared B‐CDs, Y‐CDs, R‐CDs possessed bright fluorescence at 425 nm, 550 640 photoluminescence quantum yields (PLQYs) 54.68%, 17.93%, 2.88%,...

This article reports a reproducible and facile approach to synthesize faceted copper nanocrystals (Cu NCs) using an inexpensive oxide as precursor. By simply prolonging the reaction time, Cu cubes polyhedrons were successfully produced, mean size could be effectively controlled in range of 9 21 nm. The catalytic activities investigated by photometrically monitoring reduction p-nitrophenol excess NaBH4. kinetics at different temperatures determine activation parameters. Our investigations...

Organometal halide perovskites are promising materials for optoelectronic devices. Further development of these devices requires a deep understanding their fundamental structure-property relationships. The effect pressure on the structural evolution and band gap shifts methylammonium lead chloride (MAPbCl3) was investigated systematically. Synchrotron X-ray diffraction Raman experiments provided information shrinkage, tilting distortion, amorphization primitive cubic unit cell. In situ high...

SnS nanocrystals have been synthesized in a simple and facile way. Sn6O4(OH)4 is introduced to synthesize tin sulfide, which used as precursor. By changing the reaction conditions (reaction temperature Sn/S molar ratio), with different shape size can be produced. nanoparticles nanoflowers orthorhombic crystal structure uniform distribution. The firstly transform polycrystalline nanoflowers, then become amorphous nanosheets. drive force of amorphization reduces high free-energy nanocrystals....

Pressure-induced emission enhancement (PIEE), a novel phenomenon in the of solid-state efficiency fluorophores, has been arousing wide attention recent years. However, research on PIEE is still early stage. To further pursue more enhanced efficiency, discovering and designing systems would be urgently desirable great importance. In this Letter, we found that carbazole presented conspicuous under high pressure up to 1.0 GPa. situ high-pressure infrared spectroscopy angle-dispersive X-ray...

Single-crystalline Cu_1.11Ir nanocages were synthesized, which exhibited high catalytic performance toward the oxygen evolution reaction in 0.05 M H₂SO₄.

Abstract Mechanofluorochromic materials, which change their photoluminescence (PL) colors in responding to mechanical stimuli, can be used as mechanosensors, security papers, and photoelectronic devices. However, traditional mechanofluorochromic materials only adjusted a monotone direction upon the external stimuli. Controllable pressure‐triggered blue‐ red‐shifted PL is reported for C‐dots. The origin of mechanofluorochromism (MFC) C‐dots interpreted based on structure–property...

Maximizing the regeneration of singlet excitons remains a considerable challenge in deep-blue emission systems to obtain low-cost, high-efficiency fluorescent materials. However, formation long-lifetime triplet generally dominates radiative process, making it greatly difficult harvest with high color purity because depression excitons. Here, very bright double perovskite Cs2Na0.4Ag0.6InCl6 alloyed Bi doping (CNAICB) was successfully achieved by pressure-driven reverse intersystem crossing...

Open AccessCCS ChemistryRESEARCH ARTICLE1 Apr 2020Whether or Not Emission of Cs4PbBr6 Nanocrystals: High-Pressure Experimental Evidence Zhiwei Ma, Fangfang Li, Dianlong Zhao, Guanjun Xiao and Bo Zou Ma State Key Laboratory Superhard Materials, College Physics, Jilin University, Changchun 130012 (China) , Li Physics Technology for Advanced Batteries (Ministry Education), Zhao *Corresponding authors: E-mail Address: [email protected], protected] xguan[email...

Synthesis of nanomaterials with target crystal structures, especially those new structures that cannot be crystallized in their bulk counterparts, is considerable interest owing to strongly structure-dependent properties. Here, we have successfully synthesized and identified new-phase nanocrystals (NCs) associated orthorhombic MnP-type (B31) MnS by utilizing an effective high-pressure technique. It particularly worth noting the generated structured NCs were captured as expected quenching...

Pressure quenching of optical emission largely limits the potential application many materials in pressure-sensing devices, since intensity is crucially connected to performance. Boosting visible-light at high pressure is, therefore, an important goal. Here, we demonstrate that CdSe nanocrystals (NCs) can be enhanced by more than order magnitude compression. The brightest achieved pressures corresponding phase transitions different sized NCs. Very bright blue obtained exploiting increase...

Abstract A series of BaLi 2 Al Si N 6 (BLASN): x Eu 2+ phosphors are successfully synthesized and their crystal structure luminescence properties under varying hydrostatic pressures reported herein. Structure variation is analyzed using in situ high‐pressure X‐ray diffraction Rietveld refinements. Based on decay curves Gaussian fitting emission spectra, the presence two photoluminescence centers demonstrated. : 0.01Eu exhibits an evident peak position shift from 532 to 567 nm with increase...

In this work, through the introduction of different lengths alkoxy chains to dinuclear cyclometalated platinum(II) complexes, apparent color, solubility, luminescence properties, and self-assembly behaviors have been remarkably modulated. solid state, properties found arise from emission origins that switch between 3MMLCT excited state in red solids 3IL yellow depending on chain lengths. The is show obvious bathochromic shifts under mechanical grinding decreased intensity controllable...

The success in pressure-induced emission (PIE) from hybrid perovskites greatly facilitates the potential development of high-efficiency white-light-emitting diodes and scintillators. However, its reversibility essentially inhibits practical applications. Furthermore, urgent demand for scintillators requests fast decay response time a large Stokes shift that suppresses self-adsorption. Here, we report quantitative steric hindrance effect different organic components perovskites. Moreover,...

Improvements in yellow light production, a healthy source for the eyes that is also beneficial to biological growth, are needed satisfy practical requirements of solid-state lighting. Here, we report high-brightness emission zero-dimensional lead-free double-perovskite Rb2TeCl6 microcrystals (MCs) driven by high-pressure processing. We note photoluminescence quantum yields (PLQYs) experience significant enhancement an order magnitude upon mild pressure 1.7 GPa. The overlap between ground...

Piezochromic materials refer to a class of matters that alter their photoluminescence (PL) colors in response the external stimuli, which exhibit promising smart applications anti-counterfeiting, optoelectronic memory and pressure-sensing. However, so far, most reported piezochromic have been confined organic or hybrid containing moieties with limited range less than 100 nm visible region. Here, we achieved an intriguing piezochromism all-inorganic zero-dimensional (0D) Cs