Ceramic Wafer Scintillation Screen by Utilizing Near‐Unity Blue‐Emitting Lead‐Free Metal Halide (C₈H₂₀N)₂Cu₂Br₄

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 33(5)

Published: Nov. 18, 2022

Abstract Scintillators with high light yield, low detection limit, large X‐ray attenuation efficiency as well stable and nontoxic compositions are of great importance for radiation applications. Here, 0D (C 8 H 20 N) 2 Cu Br 4 single crystals obtained show blue emission peaking at 468 nm a near‐unity photoluminescence quantum yield 99.7%, Stokes shift 148 (i.e., negligible self‐absorption), good environmental stability along strong absorption capability. Moreover, up to ≈ 91 300 photons/MeV limit 52.1 nGy air s −1 realized, which is more than one hundred times lower the dose rate 5.5 µGy required medical diagnostics. ceramic wafer scintillation screen fabricated by cold pressing sintering process, clear contrast images opaque metal box electronic component spatial resolution 9.54 lp mm realized. This study not only designs new lead‐free halide scintillator, but also develops universal strategy preparation large‐sized scintillator in nondestructive imaging.

Language: Английский

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Sequential and Reversible Phase Transformations in Zero‐Dimensional Organic‐Inorganic Hybrid Sb‐based Halides towards Multiple Emissions

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(49)

Published: Oct. 8, 2022

Abstract Zero‐dimensional (0D) metal halides have drawn increasing attention due to the attractive structure dependent photoluminescence (PL) properties. Here, we report two new 0D organic–inorganic hybrid Sb‐based halides, (MTP) 6 SbBr Sb 2 Br 9 ⋅H O (MTP=Methyltriphenylphosphonium, crystal 1) and 5 (crystal 2), featuring a reversible structural phase transformation tunable orange red emissions upon dehydration rehydration of H molecules. Intriguingly, subsequent heat treatment further enables formation glassy state (glass 3) with near‐infrared luminescence, moreover, sequential reverse from glass 3 1 is triggered by acetonitrile water vapor stepwise. The anti‐counterfeiting demo based on PL switching finally achieved thus engineering in expands their multiple applications optical fields.

Language: Английский

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Ultralow‐loss Optical Waveguides through Balancing Deep‐Blue TADF and Orange Room Temperature Phosphorescence in Hybrid Antimony Halide Microstructures

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(39)

Published: Aug. 14, 2023

Harnessing the potential of thermally activated delayed fluorescence (TADF) and room temperature phosphorescence (RTP) is crucial for developing light-emitting diodes (LEDs), lasers, sensors, many others. However, effective strategies in this domain are still relatively scarce. This study presents a new approach to achieving highly efficient deep-blue TADF (with PLQY 25 %) low-energy orange RTP 90 through fabrication lead-free hybrid halides. class monomeric dimeric 0D antimony halides can be facilely synthesized using bottom-up solution process, requiring only few seconds minutes, which offer exceptional stability nontoxicity. By leveraging adaptable molecular arrangement crystal packing modes, demonstrate ability self-assemble into regular 1D microrod 2D microplate morphologies. self-assembly facilitated by multiple non-covalent interactions between inorganic cores organic shells. Notably, these microstructures exhibit outstanding polarized luminescence function as low-dimensional optical waveguides with remarkably low optical-loss coefficients. Therefore, work not pioneering demonstration halides, but also introduces micro/nanostructures that hold promising applications white LEDs photonic systems.

Language: Английский

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Achieving Near‐unity Photoluminescence Quantum Yields in Organic‐Inorganic Hybrid Antimony (III) Chlorides with the [SbCl₅] Geometry

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(10)

Published: Jan. 9, 2023

Hybrid organic-inorganic antimony halides have attracted increasing attention due to the non-toxicity, stability, and high photoluminescence quantum yield (PLQY). To shed light on structural factors that contribute PLQY, five pairs of with general formula A2 SbCl5 Sb2 Cl8 are synthesized via two distinct methods characterized. The type adopts square pyramidal [SbCl5 ] geometry near-unity while seesaw dimmer [Sb2 PLQY≈0 %. Through combined data analysis literature, we found series generally has much longer Sb⋅⋅⋅Sb distances, leading more expressed lone SbIII . Additional including Sb-Cl distance stability chlorides may also affect PLQY. Our targeted synthesis correlated insights provide efficient tools precisely form highly emissive materials for optoelectronic applications.

Language: Английский

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Crystal-Liquid-Glass Transition and Near-Unity Photoluminescence Quantum Yield in Low Melting Point Hybrid Metal Halides

Journal of the American Chemical Society, Journal Year: 2023, Volume and Issue: 145(22), P. 12360 - 12369

Published: May 25, 2023

Hybrid metal halides (HMHs) are a class of materials that combine extraordinary photophysical properties and excellent processability. Their chemical variability allows for the solid-liquid transition toward melt-processable HMHs. Herein, we report design synthesis zero-dimensional HMHs [M(DMSO)6][SbCl6], where isolated octahedra [M(DMSO)6]3+ [SbCl6]3- alternatively aligned in crystal structure. The luminescent center enables photogeneration self-trapped excitons, resulting broadband photoluminescence with large Stokes shift nearly 100% quantum yield. Meanwhile, release DMSO ligands from is controlled by M-O coordination thus low melting point ∼90 °C achieved Interestingly, glass phase obtained melt quenching, sharp change colors compared to robust crystal-liquid-glass opens new avenue tailoring structural disorder optoelectronic performance organic-inorganic materials.

Language: Английский

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Regulating Eu²⁺ Multisite Occupation through Structural Disorder toward Broadband Near-Infrared Emission

Chemistry of Materials, Journal Year: 2023, Volume and Issue: 35(3), P. 1432 - 1439

Published: Jan. 27, 2023

To promote the development of near-infrared (NIR) light sources in optoelectronic and biomedical applications, discovery NIR-emitting phosphor materials their design principles are essential. Herein, we report a novel Eu2+-activated broadband phosphor, BaSrGa4O8:Eu2+, which features multisite occupation due to Ba/Sr oxygen site occupancy disorder. With an increase atomic ratio from 1:1 1.7:0.3, Eu2+ emission band maximum red-shifts 670 775 nm, along with enlargement full width at half-maximum (FWHM) 140 230 nm. The underlying mechanism for structure–property relationship is elucidated using density functional theory calculations. application NIR phosphor-converted light-emitting diodes (pc-LEDs) demonstrated, showing potential night-vision technology. Our results can initiate further exploitation host structural disorder toward luminescence applications pc-LEDs.

Language: Английский

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Photophysical studies for Cu(i)-based halides: broad excitation bands and highly efficient single-component warm white-light-emitting diodes

Chemical Science, Journal Year: 2023, Volume and Issue: 14(20), P. 5415 - 5424

Published: Jan. 1, 2023

Designing and synthesizing cuprous halide phosphors unifying efficient low-energy emission a broad excitation band is still great challenge. Herein, by rational component design, three novel Cu(i)-based metal halides, DPCu4X6 [DP = (C6H10N2)4(H2PO2)6; X Cl, Br, I], were synthesized reacting p-phenylenediamine with (CuX), they show similar structures, consisting of isolated [Cu4X6]2- units separated organic layers. Photophysical studies uncover that the highly localized excitons rigid environment give rise to yellow-orange photoluminescence in all compounds spanning from 240 450 nm. The bright PL (X Br) originates self-trapped due strong electron-phonon coupling. Intriguingly, DPCu4I6 features dual-band emissive characteristic, attributed synergistic effect halide/metal-to-ligand charge-transfer (X/MLCT) triplet cluster-centered (3CC) excited states. Benefiting broadband excitation, high-performance white-light emitting diode (WLED) high color rendering index 85.1 was achieved using single-component phosphor. This work not only unveils role halogens photophysical processes but also provides new design principles for WLEDs.

Language: Английский

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Near‐Infrared Light Emitting Metal Halides: Materials, Mechanisms, and Applications

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(21)

Published: Feb. 21, 2024

Near-Infrared (NIR) light emitting metal halides are emerging as a new generation of optical materials owing to their appealing features, which include low-cost synthesis, solution processability, and adjustable properties. NIR-emitting perovskite-based light-emitting diodes (LEDs) have reached an external quantum efficiency (EQE) over 20% device stability 10,000 h. Such results sparked interest in exploring NIR halide emitters. In this review, several different types halides, including lead/tin bromide/iodide perovskites, lanthanide ions doped/based double low dimensional hybrid Bi

Language: Английский

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Integrating Full‐Color 2D Optical Waveguide and Heterojunction Engineering in Halide Microsheets for Multichannel Photonic Logical Gates

Advanced Science, Journal Year: 2024, Volume and Issue: 11(17)

Published: Feb. 29, 2024

Ensuring information security has emerged as a paramount concern in contemporary human society. Substantial advancements this regard can be achieved by leveraging photonic signals the primary carriers, utilizing logical gates capable of wavelength tunability across various time and spatial domains. However, challenge remains rational design materials possessing space-time-color multiple-resolution capabilities. In work, facile approach is proposed for crafting metal-organic halides (MOHs) that offer resolution. These MOHs integrate time-resolved room temperature phosphorescence color-resolved excitation dependencies with both space-resolved ex situ optical waveguides heterojunctions. Capitalizing on these multifaceted properties, MOHs-based two-dimensional (2D) heterojunctions exhibit ability to tune full-color emissions spectra from blue red, operating within different temporal scales. Therefore, work introduces an effective methodology engineering resolved MOH microstructures, holding significant promise development high-density devices.

Language: Английский

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Temperature-Dependent Reversible Optical Properties of Mn-Based Organic–Inorganic Hybrid (C₈H₂₀N)₂MnCl₄ Metal Halides

ACS Applied Materials & Interfaces, Journal Year: 2023, Volume and Issue: 15(4), P. 5487 - 5494

Published: Jan. 18, 2023

Organic-inorganic metal halides (OIMHs) have abundant optical properties and potential applications, such as light-emitting diodes, displays, solar cells, photodetectors. Herein, we report zero-dimensional Mn-based OIMH (C8H20N)2MnCl4 single crystals synthesized by a simple slow evaporation method, which exhibit intense green emission at 520 nm originating from 4T1-6A1 transition of Mn2+ ions. Large organic cations in the crystal structure result isolated [MnCl4]2- tetrahedrons, closest Mn-Mn distance reaches 9.07 Å, effectively inhibits migration excitation energy between adjacent centers, thus achieving high quantum yield (∼87%) long photoluminescence (PL) lifetime (3.42 ms). The different structural low temperatures are revealed temperature-dependent PL X-ray diffraction spectra. spectra lifetimes under heating cooling processes indicate that property transitions reversible 220/240 K. Our work provides promising strategy for building multifunctional optoelectronic materials insights into understanding convertible photophysical isomers halides.

Language: Английский

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