Ultrabright and Stable Red Perovskite Nanocrystals in Micro Light‐Emitting Diodes Using Flow Chemistry System

Small, Год журнала: 2025, Номер unknown

Опубликована: Янв. 27, 2025

Abstract Addressing the challenges of efficiency and stability red perovskite nanocrystals is imperative for successful deployment these materials in displays lighting applications. structural dynamic changes quantum dots (PQDs) are explored using a flow chemistry system to solve above hurdles. First, ultrabright red‐emitting PQDs CsPb(Br,I) 3 achieved by adjusting ligand distribution (oleic acid oleyamine) combination with different rates equivalence ratios. The exhibit an impressive photoluminescence yield (PLQY) 95%. In addition, as mentioned numerous previous studies, severe instability mixed halide perovskites due immigration. Therefore, this paper, zinc, which has lower dissociation energy than lead utilized, reagent provide more ions synthesis enhance PQDs. As result, @Cs 4 Pb(Br,I) 6 core‐shell structure outstanding 92% PLQY obtained. simple method synthesizing paves way production micro light‐emitting diodes commercial

Язык: Английский

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Fluoride Ion Passivation of CsPbBr₃ Nanocrystals at Room Temperature for Highly Efficient and Stable White Light-Emitting Diodes

ACS Applied Materials & Interfaces, Год журнала: 2025, Номер 17(11), С. 17143 - 17152

Опубликована: Март 6, 2025

Inorganic halide perovskite nanocrystals (NCs) are regarded as promising emitters for light-emitting diodes due to their bright and narrow emission. However, surface defects often result in trap states ion migration, which remains a huge challenge high-quality NCs. Herein, fluoride ions introduced into CsPbBr3 NCs at room temperature through the chelation of ligands. Experimental results demonstrate that these from inorganic salts can improve average lifetime crystallinity Meanwhile, resulting photoluminescence quantum yield is optimized up 99.02%, it has high stability water, heat, ultraviolet light. Density functional theory calculations show have higher binding energy compared other ligands, not only removes electron trapping center but also increases halogen migration energy. By mixing green-emission red-emission K2SiF6:Mn4+ phosphors on blue chip, fabricated white light emitting diode shows luminous efficiency 147.8 lm/W, wide color gamut (129% NTSC), CIE coordinates (0.3160, 0.3051). Furthermore, intensity decreased by 2.9% after 48 h continuous operation.

Язык: Английский

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Yttrium Cation Doping and Phenylphosphonic Acid Passivation for Pure-Red Perovskite Light-Emitting Diodes

ACS Energy Letters, Год журнала: 2024, Номер 9(9), С. 4699 - 4707

Опубликована: Сен. 3, 2024

Surface defects and instability in CsPbBrxI3–x nanocrystals (NCs) present significant obstacles to their potential application high-performance pure-red perovskite light-emitting diodes (PeLEDs). Here, we report a synergistic approach involving Yttrium cation (Y3+) doping phenylphosphonic acid (PPA) passivation address the aforementioned issues. The introduction of Y3+ ion not only reduces formation energy NCs but also increases iodide vacancy defect energy. PPAs can coordinate with uncoordinated Pb2+ ions through phosphine oxide groups, effectively passivating surface defects. Additionally, hydroxyl groups form hydrogen bonds adjacent halide ions, thereby suppressing migration further strengthening effect. Consequently, Y/PPA comodified exhibit significantly enhanced stability near-unity photoluminescence quantum yields. PeLEDs based on these possess outstanding spectral peak external efficiency 24.5%, representing one top-performing reported so far.

Язык: Английский

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In-Situ Surface Repair of FAPbBr₃ Quantum Dots toward High-Performance Pure-Green Perovskite Light-Emitting Diodes

Nano Letters, Год журнала: 2024, Номер unknown

Опубликована: Сен. 20, 2024

Metal halide perovskite light-emitting diodes (PeLEDs) are ideal for high-resolution displays due to their tunable emission, narrow spectra, and low-cost processing. Colloidal FAPbBr

Язык: Английский

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Strategies for Stabilizing Metal Halide Perovskite Light-Emitting Diodes: Bulk and Surface Reconstruction of Perovskite Nanocrystals

ACS Nano, Год журнала: 2025, Номер unknown

Опубликована: Март 7, 2025

Light-emitting colloidal lead halide perovskite nanocrystals (PeNCs) are considered promising candidates for next-generation vivid displays. However, the operational stability of light-emitting diodes (LEDs) based on PeNCs is still lower than those polycrystalline films, which requires an understanding defect formation in PeNCs, both inside crystal lattice ("bulk") and at surface. Meanwhile, uncontrollable ion redistribution electrochemical reactions under LED operation can be severe, also related to bulk surface quality a well-designed device architecture boost carrier injection balance radiative recombination. In this review, we consider reconstruction by enhancing rigidity rationally selecting ligands. Degradation pathways applied voltage discussed, strategies avoid undesirable migration PeNC films. Subsequently, other critical issues hindering commercial application LEDs including toxicity Pb perovskites, scale-up deposition design active-matrix prototypes high-resolution modules.

Язык: Английский

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Enhanced fluorescence resonance energy transfer in CsPbBr3 quantum dot-rhodamine 640 molecule hybrid system: Toward high-efficiency and high-rate capability

Journal of Photochemistry and Photobiology A Chemistry, Год журнала: 2025, Номер unknown, С. 116283 - 116283

Опубликована: Янв. 1, 2025

Язык: Английский

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Enhancing the Performance of Perovskite Environmental Sensors through the Synergistic Effect of the Natural Antioxidant

ACS Applied Materials & Interfaces, Год журнала: 2025, Номер unknown

Опубликована: Фев. 4, 2025

All-inorganic perovskite CsPbX3 is considered to be the next-generation optical material due its excellent properties and potential applications in optoelectronics. However, inherent ionic crystal property makes it susceptible interaction with moisture oxygen ambient atmosphere hinders development of stable devices. Herein, a natural nontoxic molecule, ascorbic acid (AA), introduced improve performance nanocrystals. Experimental results reveal that strong coordination between carbonyl groups undercoordinated Pb2+, together hydrogen bonding hydroxyl defects halide ions AA, suppress nonradiative recombination. In addition, synergistic effect C═O –OH structure exhibits stability bonding. Finally, demonstration humidity sensing based on perovskites has been presented. It shown sensor good sensitivity range 30%–80% relative humidity, detection limit 3.9% response time 46 s. This work provides low-cost, nontoxic, efficient modification approach demonstrates an easy way perovskite.

Язык: Английский

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Controllable Transition Metal Cations Doping Enable Efficient and Spectral Stable Pure‐Red Perovskite QLED

Small, Год журнала: 2025, Номер unknown

Опубликована: Фев. 16, 2025

Mixed-halide perovskite plays important role in wide-color gamut displays as a vital material for three primary colors. However, halide segregation and caused unstable spectra are the intrinsic problem mixed-halide light-emitting diodes (PeLEDs) originating from lattice strain resulting defects quantum dots (PQDs). Here, smaller transition metal cations applied to replace Pb2+ release strain, which avoids halogen escaping/halide vacancies forming ensure high photoluminescence yield (PLQY) stable spectra. actual doping amount is limited by ionic size chemical environment, will affect improvement of optoelectronic performance. Thus, this study proposes strategy introducing tri-n-octylphosphine coordinate strongly with catch them participate nucleation-growth process. Through effectively, CsPb(BrI)3 PQDs show PLQY (92%) long lifetime (107.83 ns). Further, highly efficient pure-red PeLEDs highest external efficiency 16.86% fabricated spectrum can be stabilized at 630 nm only 1 red-shift under bias, showing promising potential next-generation display.

Язык: Английский

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Composition Modulation of Cs₂ZrCl₆‐based Scintillator Film via Vapor Deposition for Large‐Area X‐Ray Imaging

Small Methods, Год журнала: 2025, Номер unknown

Опубликована: Март 17, 2025

Abstract Metal halide scintillators for X‐ray imaging have shown remarkable potential, however, achieving large‐area film has been hindered by challenges in materials design and fabrication methods, particularly regarding composition uniformity high‐resolution applications. Here, a multi‐source vapor deposition (MSVD) method is employed to realize the facile modulation designing MA + Br − (MA = methylammonium) co‐doped Cs 2 ZrCl 6 (MCZCB) further synthesizing uniform scintillator film. The incorporation of ions, with their slightly larger ionic radius, induces lattice distortion, enhancing self‐trapped excitons (STEs) luminescence MCZCB significantly boosting photoluminescence quantum yield (PLQY) from 70% pristine (CZC) an impressive 95%. Finally, 100 cm 95% visible light transparent fabricated, spatial resolution 25.1 lp mm −1 . This result demonstrates that MSVD technology promising as practical strategy fabricating

Язык: Английский

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Small-Sized CsPbI₃ Quantum Dots for High-Performance Pure Red Light-Emitting Diodes

ACS Applied Energy Materials, Год журнала: 2025, Номер unknown

Опубликована: Март 26, 2025

Язык: Английский

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