Scintillation Properties of CsPbBr₃ Nanocrystals Prepared by Ligand-Assisted Reprecipitation and Dual Effect of Polyacrylate Encapsulation toward Scalable Ultrafast Radiation Detectors

Nano Letters, Journal Year: 2024, Volume and Issue: 24(3), P. 905 - 913

Published: Jan. 10, 2024

Lead halide perovskite nanocrystals (LHP-NCs) embedded in polymeric hosts are gaining attention as scalable and low-cost scintillation detectors for technologically relevant applications. Despite rapid progress, little is currently known about the properties stability of LHP-NCs prepared by ligand assisted reprecipitation (LARP) method, which allows mass scalability at room temperature unmatched any other type nanostructure, implications incorporating into polyacrylate still largely debated. Here, we show that LARP-synthesized CsPbBr3 NCs comparable to particles from hot-injection routes unravel dual effect incorporation, where partial degradation luminescence counterbalanced passivation electron-poor defects host acrylic groups. Experiments on with tailored surface balance between such antithetical effects polymer embedding determined defect density provide guidelines further material optimization.

Language: Английский

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Ligands in Lead Halide Perovskite Nanocrystals: From Synthesis to Optoelectronic Applications

Small, Journal Year: 2022, Volume and Issue: 19(11)

Published: Dec. 14, 2022

Abstract Ligands are indispensable for perovskite nanocrystals (NCs) throughout the whole lifetime, as they not only play key roles in controllable synthesis of NCs with different sizes and shapes, but also act capping shell that affects optical properties electrical coupling NCs. Establishing a systematic understanding relationship between ligands is significant to enable many potential applications This review mainly focuses on influence First all, ligands‐dominated size shape control discussed. Whereafter, surface defects bonding classified, corresponding post‐treatment via summarized. Furthermore, advances engineering towards high performance optoelectronic devices based NCs, including photodetector, solar cell, light emitting diode (LED), laser, finally challenges

Language: Английский

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Ultrafast and Radiation-Hard Lead Halide Perovskite Nanocomposite Scintillators

ACS Energy Letters, Journal Year: 2023, Volume and Issue: 8(9), P. 3883 - 3894

Published: Aug. 28, 2023

The use of scintillators for the detection ionizing radiation is a critical aspect in many fields, including medicine, nuclear monitoring, and homeland security. Recently, lead halide perovskite nanocrystals (LHP-NCs) have emerged as promising scintillator materials. However, difficulty affordably upscaling synthesis to multigram level embedding NCs optical-grade nanocomposites without compromising their optical properties still limits widespread use. In addition, fundamental aspects scintillation mechanisms are not fully understood, leaving scientific community suitable fabrication protocols rational guidelines full exploitation potential. this work, we realize large polyacrylate nanocomposite based on CsPbBr3 NCs, which synthesized via novel room temperature, low waste turbo-emulsification approach, followed by situ transformation during mass polymerization process. interaction between polymer chains strengthens structure, homogenizes particle size distribution passivates NC defects, resulting prototypes with luminescence efficiency >90%, exceptional hardness, 4800 ph/MeV yield even at loading, ultrafast response time, over 30% occurring first 80 ps, fast-time applications precision medicine high-energy physics. Ultrafast radioluminescence spectroscopy experiments using pulsed synchrotron light further disambiguate origin kinetics result charged-exciton multiexciton recombination formed under excitation. This highlights role nonradiative Auger decay, whose potential impact fast timing anticipate kinetic model.

Language: Английский

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Ligand-Assisted Reprecipitation of Highly Luminescent Perovskite Nanocrystals

ACS Applied Nano Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 10, 2025

Ligand-assisted reprecipitation (LARP) is a facile room-temperature synthesis method suitable for the mass production of perovskite nanocrystals (NCs). However, it encounters serious problems such as low product yields and poor quality. Here, polymer ligand (P-AMDL) designed synthesized composed four monomers 2-acrylamido-2-methylpropanesulfonic acid (A), methyl methacrylate (M), 2-(dimethylamino) ethyl (D), lauryl (L). Sulfonic groups, amide ester groups provide multiple binding sites P-AMDL, long alkyl chains can improve hydrophobicity redispersion ability. CsPbBr3 NCs high quality (PLQY > 90%) are by P-AMDL-assisted in toluene. Even at proportion precursor/toluene (∼1/1 v/v), still obtained yield, which conducive to reducing use organic solvents. A scale-up well-dispersed proves that P-AMDL avoid wide particle size distribution caused mixing diffusion. After having been stored solid state 100 days, P-AMDL-stabilized be redispersible toluene recover original PL properties 90%), provides safe convenient way storage transportation NCs.

Language: Английский

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Polar-Solvent-Free Sonochemical Synthesis of Mn(II)-Doped CsPbCl₃ Perovskite Nanocrystals for Dual-Color Emission

ACS Applied Nano Materials, Journal Year: 2023, Volume and Issue: 6(6), P. 4693 - 4706

Published: March 9, 2023

We present a facile, one-step, polar-solvent-free sonochemical synthesis of series Mn-doped CsPbCl3 perovskite nanocrystals (PNCs) by varying the Pb-to-Mn ratio, after which their structure, morphology, and temperature-dependent photoluminescence (PL) properties are investigated. The partial substitution Pb2+ with Mn2+ in PNCs caused lattice contraction without affecting morphology structure. All exhibited dual-wavelength PL profiles, weak violet band at around 410 nm attributed to band-edge exciton strong orange 596 Mn2+:4T1→6A1 transition, benefited exciton-to-Mn2+ energy transfer. Furthermore, Mn doping increased quantum yield (PLQY) from 5.1% 41.14% for 11.8% as well decay lifetimes nanoseconds milliseconds (long-lived emissive states). Owing thermally assisted transition 4T1 level Mn2+, steady-state time-resolved spectra displayed unusual contradictory trends. ultrasonication synthesized superior long-term stability, retaining 62% (@ RH 75%) initial requiring additional encapsulation. To evaluate suitable application white light-emitting diode (w-LED) display system, we built prototype w-LED using blue-, green-, orange-emitting CsPb(Cl0.5/Br0.5)3, CsPbBr3, CsPbCl3-coated glass slices onto 20 mA UV LED chip. constructed generated bright light, achieving luminous efficiency 76.3 lm/W, color rendering index 81.4, R9 80.1, wide gamut 101.78% NTSC 76% BT-2020, demonstrating its promising w-LEDs.

Language: Английский

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In situ and General Multidentate Ligand Passivation Achieves Efficient and Ultra‐Stable CsPbX₃ Perovskite Quantum Dots for White Light‐Emitting Diodes

Small, Journal Year: 2023, Volume and Issue: 20(3)

Published: Sept. 10, 2023

Abstract Inorganic CsPbX 3 perovskite quantum dots (PeQDs) show great potential in white light‐emitting diodes (WLEDs) due to excellent optoelectronic properties, but their practical application is hampered by low photoluminescence yield (PLQY) and especially poor stability. Herein, we developed an in‐situ general multidentate ligand passivation strategy that allows for PeQDs not only near‐unit PLQY, significantly improved stability against storage, heat, polar solvent. The enhanced optical property arises from high effectiveness of the ligand, diethylenetriaminepentaacetic acid (DTPA) with five carboxyl groups, passivating uncoordinated Pb 2+ defects suppressing nonradiative recombination. First‐principles calculations reveal attributed tridentate binding mode DTPA remarkably boosts adsorption capacity PeQD core. Finally, combining green red blue chip, demonstrated highly luminous WLEDs distinctly operation stability, a wide color gamut 121.3% national television system committee, standard light (0.33,0.33) CIE 1931, tunable temperatures warm cold readily emitters’ ratio. This study provides operando yet approach achieve efficient stable accelerates progress commercialization.

Language: Английский

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Metal Halide Perovskite Nanocrystals for C–X Activation: Role of Halide Vacancies

ACS Applied Nano Materials, Journal Year: 2024, Volume and Issue: 7(14), P. 16913 - 16921

Published: July 16, 2024

Metal halide perovskite nanocrystals (NCs) possess immense potential in photocatalysis. However, deciphering the intricate surface chemistry that governs these catalytic processes remains a challenge. This study investigates C–X bond activation with CsPbBr3 NCs, focusing on elucidating role of dynamic molecular domains dictating activity. By manipulating interactions through ligand dynamics, we identify vacancies as critical sites for activation. A systematic exploration different types reveals varying kinetics exchange, oleyl amine-capped NCs demonstrating highest reactivity. Temperature-dependent photoluminescence measurements corroborate findings, highlighting influence dynamics interactions. Additionally, postsynthetic treatments, such lead oleate modification, which leads to an increase density active (halide vacancies), significantly enhance performance. Conversely, SOBr2 treatment, repairs bromide vacancies, results almost completely suppressed So, by engineering environments, demonstrate significant improvement performance metal offering valuable insights future development.

Language: Английский

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Tunable Optoelectronic Properties of CsPbBr3 Perovskite Nanocrystals for Photodetectors Applications

The Journal of Physical Chemistry C, Journal Year: 2023, Volume and Issue: 127(34), P. 17298 - 17306

Published: Aug. 22, 2023

Inorganic halide perovskite nanocrystals (NCs) have drawn considerable attention in recent years due to their improved stability, superior photophysical properties, and defect-tolerant nature, which allows for high carrier mobility efficient charge transport various optoelectronic devices. The bandgap size of can be tuned through a variety approaches, including cation/anion exchange, ligand modification, precursor concentration adjustment. In this article, we investigate the effects on structural, optical, electronic properties cesium lead bromide (CsPbBr3) nanocrystals. We synthesized ∼13–50 nm from four different concentrations solutions. It has been observed that excitonic absorption band increases with particle as decreases. steady state photoluminescence intensity decreases shorter lifetime (in solution). fabricated photodetectors using different-size samples show photoresponsivity increasing size. diluted solution (0.005 M) exhibits highest detectivity 2.84 × 109 jones larger crystal fewer defect states, results higher diffusion length reduced free recombination.

Language: Английский

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Advancements in Perovskite Nanocrystal Stability Enhancement: A Comprehensive Review

Nanomaterials, Journal Year: 2023, Volume and Issue: 13(11), P. 1707 - 1707

Published: May 23, 2023

Over the past decade, perovskite technology has been increasingly applied in solar cells, nanocrystals, and light-emitting diodes (LEDs). Perovskite nanocrystals (PNCs) have attracted significant interest field of optoelectronics owing to their exceptional optoelectronic properties. Compared with other common nanocrystal materials, nanomaterials many advantages, such as high absorption coefficients tunable bandgaps. Owing rapid development efficiency huge potential, materials are considered future photovoltaics. Among different types PNCs, CsPbBr3 perovskites exhibit several advantages. offer a combination enhanced stability, photoluminescence quantum yield, narrow emission bandwidth, bandgap, ease synthesis, which distinguish them from make suitable for various applications photonics. However, PNCs also some shortcomings: they highly susceptible degradation caused by environmental factors, moisture, oxygen, light, limits long-term performance hinders practical applications. Recently, researchers focused on improving stability starting synthesis optimizing (i) external encapsulation crystals, (ii) ligands used separation purification (iii) initial methods or material doping. In this review, we discuss detail factors leading instability introduce enhancement mainly inorganic mentioned above, provide summary these approaches.

Language: Английский

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A perovskite‐based electrochemiluminescence aptasensor for tetracycline screening

Luminescence, Journal Year: 2024, Volume and Issue: 39(3)

Published: March 1, 2024

Abstract Tetracyclines are currently the most commonly used class of antibiotics, and their residue issue significantly impacts public health safety. In this study, a surface modification perovskite with cetyltrimethylammonium bromide led to generation stable electrochemiluminescence (ECL) emitters in aqueous systems improved biocompatibility perovskite. A quantum dot‐based ECL sensing strategy was developed. Utilizing corresponding aptamer strain displacement reactions were triggered, disrupting quenching system composed Ag nanoclusters (Ag NCs) on electrode surface, generating signal achieve quantitative detection several common tetracycline antibiotics. The dot provided strong initial signal, while efficient catalytic activity silver cluster enhanced recognition sensitivity. Tetracycline, chlortetracycline, oxytetracycline as examples demonstrate differentiation through method. addition, aptasensor exhibited analytical performance linear range (0.1–10 μM OTC) good recovery rates 94.7% 101.6% real samples. This approach has potential become sensitive practical for assessing antibiotic residues.

Language: Английский

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