Heavy-atom engineering of thermally activated delayed fluorophores for high-performance X-ray imaging scintillators

Nature Photonics, Journal Year: 2022, Volume and Issue: 16(12), P. 869 - 875

Published: Oct. 27, 2022

Language: Английский

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Halide Perovskite: A Promising Candidate for Next‐Generation X‐Ray Detectors

Advanced Science, Journal Year: 2022, Volume and Issue: 10(1)

Published: Dec. 1, 2022

Abstract In the past decade, metal halide perovskite (HP) has become a superstar semiconductor material due to its great application potential in photovoltaic and photoelectric fields. fact, HP initially attracted worldwide attention because of excellent efficiency. However, derivatives also show promise X‐ray detection their strong absorption, high bulk resistivity, suitable optical bandgap, compatibility with integrated circuits. this review, basic working principles modes both direct‐type indirect‐type detectors are first summarized before discussing applicability for these two types based on pros cons different perovskites. Furthermore, authors expand view preparation methods developed including single crystals polycrystalline materials. Upon systematically analyzing photoelectronic characteristics basis structures dimensions (0D, 2D, 3D), recent progress HPs (mainly polycrystalline) applied flexible reviewed, practicability feasibility discussed. Finally, by reviewing current research HP‐based detection, challenges field identified, main directions prospects future suggested.

Language: Английский

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Metal‐Free PAZE‐NH₄X₃⋅H₂O Perovskite for Flexible Transparent X‐ray Detection and Imaging

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(36)

Published: June 21, 2022

Metal-free perovskites are of interest for their chemical diversity and eco-friendly properties, recently have been used X-ray detection with superior carrier behavior. However, the size shape complexity organic components results in difficulties evaluating stability high-energy radiation. Herein, we introduce multiple hydrogen-bond metal-free PAZE-NH4 X3 ⋅H2 O perovskite, where H2 leads to more hydrogen bonds appearing between molecules perovskite host. As suggested by theoretical calculations, promote stiffness lattice, increase diffusion barrier inhibit ionic migration. Then, low trap density, high μτ products structural flexibility Br3 give a flexible detector highest sensitivity 3708 μC Gyair-1 cm-2 , ultra-low limit 0.19 μGyair-1 s-1 spatial resolution 5.0 lp mm-1 .

Language: Английский

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Ultrabright Light Emission Properties of All-Inorganic and Hybrid Organic–Inorganic Copper(I) Halides

Chemistry of Materials, Journal Year: 2023, Volume and Issue: 35(9), P. 3364 - 3385

Published: April 24, 2023

All-inorganic and hybrid copper(I) halides have recently emerged as candidate optical materials due to their extremely high light emission efficiencies, nontoxic earth-abundant elemental compositions, low-cost solution processability. Originally inspired motivated by the research on halide perovskites family, development of emitters has been following its unique path. In this perspective, we discuss distinct low-dimensional crystal structures all-inorganic halides, which enable strong charge localization formation room-temperature self-trapped excitonic (STE) states, giving rise largely Stokes-shifted with near-unity quantum yields. Due electronic structures, copper are predominantly blue unusually weak tunability properties (e.g., substitution a minimal impact photoluminescence properties). These shortcomings paved way for exploration more robust diverse families organic–inorganic discussed next. Our discussions Cu(I) complemented reported uses these in optoelectronic applications. Finally, identify remaining fundamental questions, knowledge gaps, practical challenges outline several paths forward addressing issues, including through new discovery in-depth studies photophysics derivative materials.

Language: Английский

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Zn (II)‐Doped Cesium Copper Halide Nanocrystals with High Quantum Yield and Colloidal Stability for High‐Resolution X‑Ray Imaging

Advanced Optical Materials, Journal Year: 2023, Volume and Issue: 11(7)

Published: Jan. 19, 2023

Abstract Scintillators are essential for high‐energy radiation detection in a variety of potential applications. However, due to complex fabrication processes and nanocrystal homogeneity, conventional scintillators challenging meet the need cost‐effective, environmentally friendly, flexible X‐ray detection. Here, monodisperse nanocrystals (NCs) with small grain size colloidal stability obtained by adjusting doping concentration Zn 2+ ions controlling morphology uniformity Cs 3 Cu 2 I 5 NCs. The photoluminescence quantum yield (PLQY) optimal is as high 92.8%, which 28.5% improvement compared nondoped Density functional theory calculations reveal that dopant inclines occupy sites I‐rich condition suppresses formation vacancy, enriching excited electron density at band‐edge enhance self‐trapped exciton emission. Moreover, luminescence performance scintillator films prepared using ‐doped NCs, spatial resolution up 15.7 lp mm –1 . This work provides an effective strategy development low‐cost, efficient blue‐emitting 0D all‐inorganic metal halides, well shows their great high‐performance lead‐free low‐toxicity detector

Language: Английский

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Sequential Vacuum Evaporated Copper Metal Halides for Scalable, Flexible, and Dynamic X‐Ray Detection

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(36)

Published: May 8, 2023

Abstract Copper metal halides have emerged as a strong contender in the scintillator field due to self‐trapped excitons (STEs) mechanism. However, their development has been hindered by preparation process. Single crystals long growth cycles and cannot achieve large areas flexibility. Quantum dots low yield can easily cause chemical pollution, thickness of films prepared spin coating be controlled. To address these challenges, new method for preparing Cs 3 Cu 2 Cl 5 using sequential vacuum evaporation is developed. This allows successful large‐area (≈100 cm ) flexible films. The STEs mechanism gives it unique properties such Stokes shift that reduces self‐absorption effects, wide full width at half‐maximum improves coupling with photodiodes. Therefore, applied X‐ray imaging light ≈30 000 photons MeV −1 , spatial resolution over 10 lp mm detection limit below 0.8 µGy air s . In addition, film enables effective dynamic clear on non‐planar objects. It also exhibits good resistance harsh environments, maintaining performance after 150 days. believed provides an important idea scintillators.

Language: Английский

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High Thermal Stability of Copper-Based Perovskite Scintillators for High-Temperature X-ray Detection

ACS Applied Materials & Interfaces, Journal Year: 2023, Volume and Issue: 15(19), P. 23421 - 23428

Published: May 8, 2023

High-temperature scintillation detectors play a significant role in oil exploration. However, traditional scintillators have limited ability to meet the requirements of practical applications owing their low thermal stability. In this study, we designed and developed one-dimensional (1D) Cs5Cu3Cl6I2 scintillator with high addition, by preparing Cs5Cu3Cl7I, proved that exhibits stability because bridges linking structural units 1D chain structure are only formed I– ions, which improve rigidity. The has steady-state light yield (59,700 photons MeV–1) highest spatial resolution for powder-based screens (18 lp mm–1) after cyclic treatment within temperature range 298–423 K. allows visualization alloy melting, indicating it potential application high-temperature environments. This study provides new perspective toward design

Language: Английский

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Near-Unity Green Luminescent Hybrid Manganese Halides as X-ray Scintillators

Inorganic Chemistry, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 23, 2024

The increasing demands in optoelectronic applications have driven the advancement of organic–inorganic hybrid metal halides (OIMHs), owing to their exceptional optical and scintillation properties. Among them, zero-dimensional (0D) low-toxic manganese-based scintillators garnered significant interest due transparency elevated photoluminescence quantum yields (PLQYs), making them promising for colorful light-emitting diodes X-ray imaging applications. In this study, two OIMH single crystals (Br-PrTPP)2MnBr4 (Br-PrTPP = (3-bromopropyl) triphenylphosphonium) (Br-BuTPP)2MnBr4 (Br-BuTPP (4-bromobutyl) were prepared via a facile saturated crystallization method. Benefiting from tetrahedrally coordinated [MnBr4]2– polyhedron, both exhibited strong green emissions peaked at 517 nm d–d electron transition Mn2+ with near-unity PLQYs 99.33 86.85%, respectively. Moreover, benefiting high transparencies remarkable luminescence properties, these manganese also exhibit excellent radioluminescent performance highest light yield up 68,000 photons MeV–1, negligible afterglow (0.4 ms), linear response dose rate lowest detection limit 45 nGyair s–1. imaging, flexible film made by composite PDMS shows an ultrahigh spatial resolution 12.78 lp mm–1, which provides potential visualization tool radiography.

Language: Английский

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Photophysical Properties of Copper Halides with Strongly Confined Excitons and Their High‐Performance X‐Ray Imaging

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(26)

Published: Feb. 25, 2024

Abstract Copper halides, a new class of attractive and potential scintillators, have attracted tremendous attention in X‐ray imaging. However, the ambiguity surrounding their exciton properties unclear effect crystal structure on photophysical performance hinder an in‐depth understanding luminescence mechanism further application imaging field. Herein, copper halide scintillators Cs 3 Cu 2 X 5 (X = I, Br, Cl) with 0D is prepared, are revealed using both theoretical calculation experimental verification. The small Bohr diameter together high binding energy can cause to hold strongly confined excitons lack quantum‐size effects. materials exhibit structural framework soft lattice Frenkel strong confinement effects, resulting self‐trapped excitons. In particular, I demonstrated as efficient scintillator radioluminescence efficiency spatial resolution ≈106 µm radiography, which primarily attributed improve radiative recombination probability electron‐hole pairs. Overall, this work provides pathway for developing performance.

Language: Английский

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Single‐Source Evaporated High‐Quality Single‐Phase Cs₃Cu₂I₅ Scintillator Films for High Performance X‐Ray Imaging

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: March 29, 2024

Abstract Vacuum‐evaporated metal halides (MHs) scintillator thick films have received much attention in the X‐ray imaging field due to their excellent light yield and uniform large‐area preparation. However, inevitable heteromorphic homologs MHs (e.g., Copper‐based (Cu‐MHs): CsCu 2 X 3 ∖Cs Cu 5 ) change of film structural backbone will result spectral hybridization (phase purity), eventually detaches (lattice mismatches). Herein, a single‐source vacuum evaporation method prepare (≈10 µm) Cu‐MHs (as an example) scintillators is realized: 1) Presynthesis pure phase materials by solution with protective agent ensure purity without precise control component ratios process; 2) One‐shot formation avoids stress accumulation utilize longitudinal growth characteristics crystalline obtain crystal orientations better optical outputs. Finally, obtained comparable partially single‐crystal (53 983 photons MeV −1 resolution (14.1 lp mm partial template method. The detection system based on prepared exhibits good response speed linearity different radiation intensities exposure times. further drive application believed.

Language: Английский

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