Metal Halide Perovskites for X-ray Imaging Scintillators and Detectors

ACS Energy Letters, Journal Year: 2021, Volume and Issue: 6(2), P. 739 - 768

Published: Jan. 29, 2021

Radiation detection, using materials to convert high-energy photons low-energy (X-ray imaging) or electrical charges detector), has become essential for a wide range of applications including medical diagnostic technologies, computed tomography, quality inspection and security, etc. Metal halide perovskite-based high-resolution scintillation-imaging screens direct conversion detectors are promising candidates such applications, because they have high absorption cross sections X-rays due their heavy atom (e.g., Pb2+, Bi3+, I–) compositions; moreover, these solution-processable at low temperature, possessing tunable bandgaps, near-unity photoluminescence quantum yields, trap density, charge carrier mobility, fast photoresponse. In this review, we explore decipher the working mechanism scintillators as well key advantages perovskites both detection approaches. We further discuss recent advancements in research area, pointing out remaining challenges our perspective future directions toward X-ray applications.

Language: Английский

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Recent progress of zero-dimensional luminescent metal halides

Chemical Society Reviews, Journal Year: 2021, Volume and Issue: 50(4), P. 2626 - 2662

Published: Jan. 1, 2021

This review provides in-depth insight into the structure–luminescence–application relationship of 0D all-inorganic/organic–inorganic hybrid metal halide luminescent materials.

Language: Английский

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Highly efficient eco-friendly X-ray scintillators based on an organic manganese halide

Nature Communications, Journal Year: 2020, Volume and Issue: 11(1)

Published: Aug. 28, 2020

Scintillation based X-ray detection has received great attention for its application in a wide range of areas from security to healthcare. Here, we report highly efficient scintillators with state-of-the-art performance on an organic metal halide, ethylenebis-triphenylphosphonium manganese (II) bromide ((C

Language: Английский

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Efficient and Reabsorption‐Free Radioluminescence in Cs₃Cu₂I₅ Nanocrystals with Self‐Trapped Excitons

Advanced Science, Journal Year: 2020, Volume and Issue: 7(11)

Published: April 16, 2020

Radioluminescent materials (scintillators) are widely applied in medical imaging, nondestructive testing, security inspection, nuclear and radiation industries, scientific research. Recently, all-inorganic lead halide perovskite nanocrystal (NC) scintillators have attracted great attention due to their facile solution processability ultrasensitive X-ray detection, which allows for large area flexible imaging. However, the light yield of these NCs is relatively low because strong self-absorption that reduces out-coupling efficiency. Here, with self-trapped excitons emission demonstrated be sensitive, reabsorption-free scintillators. Highly luminescent stable Cs3Cu2I5 a photoluminescence quantum yields 73.7%, new record blue lead-free or perovskite-like NCs, produced assistance InI3. The PL peak locates at 445 nm matches response silicon photomultiplier. Thus, as efficient zero extremely high (≈79 279 photons per MeV). Both NC colloidal film exhibit radioluminescence under irradiation. potential application reabsorption-free, cost, area, by prototype imaging spatial resolution.

Language: Английский

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Efficient Lone-Pair-Driven Luminescence: Structure–Property Relationships in Emissive 5s² Metal Halides

ACS Materials Letters, Journal Year: 2020, Volume and Issue: 2(9), P. 1218 - 1232

Published: Aug. 4, 2020

Low-dimensional metal halides have been the focus of intense investigations in recent years following success hybrid lead halide perovskites as optoelectronic materials. In particular, light emission low-dimensional based on 5s2 cations Sn2+ and Sb3+ has found utility a variety applications complementary to those three-dimensional because its unusual properties such broadband character highly temperature-dependent lifetime. These derive from exceptional chemistry lone pair, but terminology explanations given for vary widely, hampering efforts build cohesive understanding these materials that would development efficient devices. this Perspective, we provide structural overview with dynamics driven by stereoactivity pair identify features enable strong emission. We unite different theoretical models able explain bright centers into framework, which is then applied array compounds recently developed our group other researchers, demonstrating generating holistic picture field point view chemist. highlight state-of-the-art demonstrate unique capabilities versatile emissive promising future directions halides.

Language: Английский

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Sb³⁺‐Doping in Cesium Zinc Halides Single Crystals Enabling High‐Efficiency Near‐Infrared Emission

Advanced Functional Materials, Journal Year: 2021, Volume and Issue: 31(40)

Published: July 10, 2021

Abstract Luminescent metal halide materials with flexible crystallography/electronic structures and tunable emission have demonstrated broad application prospects in the visible light region. However, designing near‐infrared (NIR) light‐emitting halides remains a challenge. Here, an enlightening prototype is proposed to explore high‐efficiency broadband NIR systems by incorporating Sb 3+ into Cs 2 ZnCl 4 matrix. Combined experimental analysis density functional theory calculations reveal modified self‐trapped excitons model elaborate emission. The high photoluminescence quantum yield of 69.9% peaking at 745 nm large full width half maximum 175 nm, along excellent air/thermal stability, show unique advantages lead‐free :Sb as source. substitution Cl − Br further enables red‐shift peak from 823 nm. diode device based on demonstrates potential non‐visible source night vision. This study puts forward effective strategy design novel eco‐friendly emissive provides guidance for expanding scope luminescent halides.

Language: Английский

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Bright Blue and Green Luminescence of Sb(III) in Double Perovskite Cs₂MInCl₆ (M = Na, K) Matrices

Chemistry of Materials, Journal Year: 2020, Volume and Issue: 32(12), P. 5118 - 5124

Published: June 8, 2020

The vast structural and compositional space of metal halides has recently become a major research focus for designing inexpensive versatile light sources; in particular, applications displays, solid-state lighting, lasing, etc. Compounds with isolated ns2-metal halide centers often exhibit bright broadband emission that stems from self-trapped excitons (STEs). Sb(III) are attractive STE emitters due to their low toxicity oxidative stability; however, coupling these features an appropriately robust, fully inorganic material containing Sb3+ octahedral environment proven be challenge. Here, we investigate as dopant solution-grown double perovskite (DP) matrix, namely Cs2MInCl6:xSb (M = Na, K, x 0-100%). Cs2KInCl6 is found crystallize the tetragonal DP phase, unlike Cs2NaInCl6 adopts traditional cubic structure. This difference results distinct colors, Cs2NaInCl6:xSb Cs2KInCl6:xSb compounds blue green emissions, respectively, photoluminescence quantum yields (PLQYs) up 93%. Spectroscopic computational investigations confirm this efficient originates Sb(III)-hosted STEs. These demonstrate can incorporated emissive center stable lighting applications.

Language: Английский

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Dual-Band Luminescent Lead-Free Antimony Chloride Halides with Near-Unity Photoluminescence Quantum Efficiency

Chemistry of Materials, Journal Year: 2019, Volume and Issue: 31(22), P. 9363 - 9371

Published: Oct. 29, 2019

Low-dimensional organic–inorganic metal halide hybrids (OIMHs) with an ultrabroad-band emission are promising as downconversion phosphors for solid-state lighting. However, toxicity of Pb and low photoluminescence quantum efficiency (PLQE) hamper their application. Herein, two zero-dimensional (0D) lead-free organic antimony (Sb) chloride (Cl) dual-band emissions PLQEs: (TTA)2SbCl5 (TTA = tetraethylammonium) (TEBA)2SbCl5 (TEBA benzyltriethylammonium) reported. Both compounds show a single broad-band orange near-unity PLQE upon low-energy photons (e.g., 360 nm) excitation. The additional blue band high-energy 300 excitation enable to be single-component phosphor white light 68%, correlated color temperature (CCT) 2360 K rendering index (CRI) 84. Based on spectra measurements density functional theory calculations, the is assigned radiative recombination from both singlet triplet self-trapped excitons in inorganic [SbCl5]2– pyramids. In addition, luminescent exhibit excellent stability against humidity thermal attacks. Using yellow material, highly stable white-light-emitting diodes Commission Internationale de l'Eclairage (CIE) (0.36, 0.33), CCT 4282 K, CRI 82 were demonstrated. These results validate that title 0D OIMHs materials

Language: Английский

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Sb³⁺ Dopant and Halogen Substitution Triggered Highly Efficient and Tunable Emission in Lead-Free Metal Halide Single Crystals

Chemistry of Materials, Journal Year: 2020, Volume and Issue: 32(12), P. 5327 - 5334

Published: May 15, 2020

Rational doping and compositional control remain significant challenges in designing luminescent metal halides to achieve highly efficient tunable emission. Here, the air-stable lead-free Cs2InCl5·H2O crystal with a zero-dimensional structure was investigated as pristine compound design new luminescence materials. Sb3+-doping Cs2InCl5·H2O:Sb3+ enabled broadband yellow emission photoluminescence quantum yield up 95.5%. The colors can be expanded into orange-red region by halogen substitution for Cs2InX5·H2O:Sb3+ (X = Cl/Br/I). optical characterizations along theoretical calculations demonstrate that characteristic singlet triplet self-trapped exciton emissions of ns2-metal-halide centers account luminescence. Moreover, admirable stability against air heat pave way its further applications white light-emitting diodes high-resolution fluorescent signs anticounterfeiting technology. Our achievement case Sb3+-doped represents successful strategy developing stable versatile applications.

Language: Английский

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Lead‐Free Halide Perovskites for Light Emission: Recent Advances and Perspectives

Advanced Science, Journal Year: 2021, Volume and Issue: 8(4)

Published: Jan. 4, 2021

Abstract Lead‐based halide perovskites have received great attention in light‐emitting applications due to their excellent properties, including high photoluminescence quantum yield (PLQY), tunable emission wavelength, and facile solution preparation. In spite of characteristics, the presence toxic element lead directly obstructs further commercial development. Hence, exploiting lead‐free perovskite materials with superior properties is urgent necessary. this review, deep‐seated reasons that benefit light for perovskites, which help develop performance, are first emphasized. Recent advances (single crystals, thin films, nanocrystals different dimensionalities) from synthesis, crystal structures, optical optoelectronic then systematically summarized. particular, phosphor‐converted LEDs electroluminescent using fully examined. Ultimately, based on current development future directions terms devices discussed.

Language: Английский

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