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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Efficient perovskite LEDs with tailored atomic layer number emission at fixed wavelengths

Science Advances, Год журнала: 2025, Номер 11(7)

Опубликована: Фев. 14, 2025

Colloidal quantum dots (QDs) have illuminated computer monitors and television screens due to their fascinating color-tunable properties depending on the size. Here, electroluminescence (EL) wavelength of perovskite LEDs was tuned via atomic layer number (ALN) nanoplates (NPs) instead "size" in conventional QDs. We demonstrated efficient with controllably tailored emission from n = 3, 4, 5, ≥7 ALN NPs specific discrete major peaks at 607, 638, 669, 728 nanometers. These peak external efficiency (EQE) 26.8% high reproducibility less than 1 2 nm difference between batches. High color stability without observable EL spectral change operating best T50 267 minutes 1.0 milliampere per square centimeter also achieved. This work demonstrates a concept tailoring fixed wavelengths, shedding light efficient, emission-discrete, color-stable for next-generation display.

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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Outcoupling Efficiency Enhanced Blue Perovskite Light-Emitting Diodes Constructed on the Mesoporous Surface of Nonplanar Rigid Molecular Scaffolds

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

Опубликована: Март 24, 2025

Producing nanostructures on a perovskite film through crystallization modulation is essential to improving the light outcoupling efficiency and performance of blue light-emitting diodes (PeLEDs). However, challenge achieving films still remains. Herein, we demonstrate that homogeneous nano holes are formed pure-bromide quasi-2D because kinetics significantly modulated by underneath mesoporous buffer layer triptycene-like pyridine with biphenyl substituents (TPC-LB). This nonplanar rigid stereoscopic molecular structure TPC-LB provides ion channels in intermolecular intramolecular cavities effectively confine components perovskite. The enhance PeLEDs. champion device shows maximum luminance 2004 cd m-2 peak external quantum 12.08%, which locates top rank similar devices three times higher than control device. work demonstrates an effective strategy improve PeLEDs, significance for promoting development

Язык: Английский

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Perovskite nanocrystal superlattices and their application in light-emitting devices

Materials Science and Engineering R Reports, Год журнала: 2025, Номер 164, С. 100984 - 100984

Опубликована: Март 25, 2025

Язык: Английский

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Carrier Dynamics Process of Bilayer Core–Shell Perovskite Nanocomposites Based on Förster Resonance Energy Transfer

Langmuir, Год журнала: 2025, Номер unknown

Опубликована: Апрель 2, 2025

Iodide-based perovskites are severely limited in practical applications due to their low photoluminescence quantum yield (PLQY), tendency undergo phase separation, and severe PL quenching the solid state. Herein, a bilayer core-shell structured perovskite nanocomposite containing Br I (BINC), based on Förster resonance energy transfer (FRET), is prepared. In BINC structure, embedded silica titanium dioxide define Si-BINC Ti-BINC structures, respectively, serving as barrier between donor (CsPbBr3) acceptor (CsPbI3), which prevents migration of halide ions. Additionally, TiO2 acts electron transport layer, facilitating electrons from CsPbBr3 TiO2, then CsPbI3. The outermost layer SiO2 enhances environmental stability structure. Both intensity lifetime at 687 nm structures increase compared with those improvement these optical properties primarily attributed FRET effect. transient absorption (TA) spectra structure shows faster ground state bleaching (GSB, ∼669 nm) signal decay rate than that Ti-BINC. rapid photogenerated carriers indicates it suitable for high-efficiency fast-response LEDs photodetectors. displays stronger GSB slower Si-BINC. This more stable optoelectronic conversion devices, such solar cells photocatalysis. investigation reveals exhibit unique properties, providing insights design efficient composite devices.

Язык: Английский

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Fabrication of blue-emitting CH3NH3PbBr3 nanocrystals: Effects of dipole moment and oxygen functional groups in precipitation solvents on the crystal growth and optical properties of CH3NH3PbBr3 nanocrystals

Journal of Colloid and Interface Science, Год журнала: 2025, Номер unknown, С. 137530 - 137530

Опубликована: Апрель 1, 2025

Язык: Английский

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Highly efficient pure red light-emitting diodes enabled by multifunctional ligand-coordinated CsPbI3 quantum dots

Nano Energy, Год журнала: 2025, Номер unknown, С. 111055 - 111055

Опубликована: Апрель 1, 2025

Язык: Английский

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Multifunctional-Ligand Enabled Stable CsPbI₃ Quantum Dots for Highly Efficient Pure-Red Light-Emitting Diodes

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

Опубликована: Июнь 3, 2025

High-performance pure-red perovskite light-emitting diodes (PeLEDs) are promising candidates for optoelectronic applications due to their remarkable photophysical properties. However, the unstable surface and insulating long-chain capping ligands of quantum dots (QDs) pose challenges commercialization by compromising stability performance. Here, a simple but effective approach was demonstrated synthesize highly stable red CsPbI3 QDs introducing multifunctional molecule, phenformin hydrochloride (PhenHCl), as an additive ligand. While biguanide functional group in PhenHCl formed multiple hydrogen-bond interactions with lead halide octahedron, excess Cl- anions compensated iodine vacancies eliminated trap states QDs. The synergistic effect halogen compensation significantly passivated defects QDs, yielding photoluminescence (PL) yield 98.6% excellent ambient 90% PL intensity retention over 80 days. resulting PeLEDs based on PhenHCl-treated were show enhancement electroluminescence performance at around 649 nm, external efficiency 13.38%, maximum luminance 2159 cd m-2. Our findings this work provide avenue modulating chemistry enhance PeLEDs.

Язык: Английский

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Green-emitting CsPbI₃ nanorods decorated with CsPb₂I₅ and Cs₄PbI₆ nanoclusters

Journal of Materials Chemistry C, Год журнала: 2024, Номер unknown

Опубликована: Янв. 1, 2024

This work presents green-emitting CsPbI 3 nanorods decorated Cs 4 PbI 6 and CsPb 2 I 5 nanoclusters with a color-tuning approach via multiple-phase combinations without changing elements. These materials have stable emission color purity.

Язык: Английский

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