Light‐Emitting Diodes Based on Metal Halide Perovskite and Perovskite Related Nanocrystals

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 29, 2025

Abstract Light‐emitting diodes (LEDs) based on halide perovskite nanocrystals have attracted extensive attention due to their considerable luminescence efficiency, wide color gamut, high purity, and facile material synthesis. Since the first demonstration of LEDs MAPbBr 3 was reported in 2014, community has witnessed a rapid development performances. In this review, historical perspective is provided then comprehensive survey current strategies for high‐efficiency lead‐based LEDs, including synthesis optimization, ion doping/alloying, shell coating presented. Then basic characteristics emission mechanisms lead‐free perovskite‐related emitters environmentally friendly from standpoint different colors are reviewed. Finally, progress LED applications covered an outlook opportunities challenges future developments field provided.

Language: Английский

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Resurfacing mixed-halide perovskite nanocrystal for efficient and spectral stable pure-red light-emitting diodes

Nano Energy, Journal Year: 2025, Volume and Issue: unknown, P. 110760 - 110760

Published: Feb. 1, 2025

Language: Английский

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Modulation of Nucleation and Growth Kinetics of Perovskite Nanocrystals Enables Efficient and Spectrally Stable Pure-Red Light-Emitting Diodes

Nano Letters, Journal Year: 2024, Volume and Issue: 24(18), P. 5631 - 5638

Published: April 26, 2024

Perovskite light-emitting diodes (PeLEDs) based on CsPb(Br/I)

Language: Английский

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Ligand‐Pinning Induced Size Modulation of CsPbI₃ Perovskite Quantum Dots for Red Light‐Emitting Diodes

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(44)

Published: July 16, 2024

Abstract Perovskite quantum dots (PQDs) show high potential for new‐generation light‐emitting diodes (LEDs) due to their outstanding optoelectronic properties. Even though the red PQD‐LEDs can be realized through mixing halide in PQDs tune spectroscopies, may suffer from phase separation under a electric field, predominantly affecting LED applications. Herein, ligand‐pinning‐assisted approach is reported spectroscopies of CsPbI 3 PQDs, which vinyl phosphonic acid (VPA) applied as function ligands regulate nucleation and growth during synthesis. Systematically experimental studies theoretical calculations are conducted comprehensively understand functions VPA PQD synthesis, reveals that with binding energy Pb 2+ cations could firmly anchor on surface matrix without desorption, regulating thus resulting tunable being realized. Meanwhile, also renovate defective substantially diminishing trap‐induced nonradiative recombination. Consequently, deliver external efficiency 22.83%, significantly improved compared control devices. This work provides new avenue toward high‐performing LEDs.

Language: Английский

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Ligand‐Induced Crystallization Control in MAPbBr₃ Hybrid Perovskites for High Quality Nanostructured Films

Advanced Optical Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 5, 2025

Abstract Controlling the formation of hybrid perovskite thin films is crucial in obtaining high‐performance optoelectronic devices, since factors like morphology and film thickness have a profound impact on film's functionality. For light‐emitting applications grain sizes sub‐micrometer‐range previously shown enhanced brightness. It therefore to develop simple, yet reliable methods produce such films. Here, solution‐based synthesis protocol for on‐substrate MAPbBr 3 (MA = methylammonium) nanostructures by adding bifunctional rac ‐3‐aminobutyric acid precursor solution reported. This route improves key optical properties as photoluminescence quantum yields life times excited states inducing controlled slow‐down suppressing agglomeration effects. In situ spectroscopy reveals delayed slowed down crystallization process, which achieves structures with much reduced defect densities. Further, aggregation can be amount amino added adjusting allows cubic crystallites targeted size from nanometer micrometer scales. The nanocrystalline samples show amplified spontaneous emission (ASE) intensities, ASE thresholds purer signals, compared pristine films, even under intense driving, making them promising lasing applications.

Language: Английский

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Suppression of Light-Induced Phase Segregations in Mixed Halide Perovskites through Ligand Passivation

The Journal of Physical Chemistry Letters, Journal Year: 2025, Volume and Issue: unknown, P. 1760 - 1768

Published: Feb. 11, 2025

Mixed halide perovskites (MHPs) are useful for tandem solar cells and optoelectronic devices due to their absorption emission tunability over the whole visible spectrum improved stability. However, one of main challenges is phase segregation under continuous illumination or applied bias, which hinders utilization applications with full potential. Here, in this letter, we studied MHPs, especially a focus CsPbI1.5Br1.5 325 nm laser through photoluminescence (PL) spectroscopy real-time video illumination. We provided remedy prevent unwanted using 1-dodecanthiol (DSH) ligand treatment. It also observed that, during relaxation dark conditions, PL characteristics can even be reverted original condition. Following passivation, film sustain almost 4 min high-power irradiation without any degradation segregation, as spectroscopy. Thereafter, negligible separation occurs after exposure light min. A demonstrates efficacy DSH suppression dispersion. The observation supported by density functional theory calculations, showing that effectively passivate vacancies suppress

Language: Английский

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Quantum‐Dot‐Electrolyte Light‐Emitting Diodes for Displays

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 17, 2025

Abstract Electroluminescence (EL) is essential for modern technologies, such as displays, lighting, and optical communications. To date, some kinds of artificial EL devices have been developed, including organic light‐emitting diodes (OLEDs), quantum‐dot (QD) LEDs, electrochemical cells. However, issues (e.g., inefficient charge injection, exciton quenching) limit the further performance. Here, another promising kind device reported, which called QD‐electrolyte LED (QE‐LED). The key feature QE‐LED that an ionic liquid doped into QDs electrolyte emitter multi‐layer architectures. Both theoretical experimental analyses reveal enhanced interface electric field from in situ formed electrical double layer leveraged to improve injection transport. With introduction insulating polymers emitters, red achieves external quantum efficiency 20.5% a lifetime (T 95 ) over 3.74 × 10 5 h at display‐related luminance 100 cd m −2 , indicating among best devices. Furthermore, active‐matrix display demonstrated with superior stability overtakes commercial benchmark. These results offer avenue discover unexplored provide potential pathways enhance dynamics

Language: Английский

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

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

Published: March 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.

Language: Английский

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Modulation of Charge Transport Layer for Perovskite Light‐Emitting Diodes

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

Published: Oct. 23, 2024

Abstract Perovskite light‐emitting diodes (Pero‐LEDs) have garnered significant attention due to their exceptional emission characteristics, including narrow full width at half maximum, high color purity, and tunable colors. Recent efficiency operational stability advancements positioned Pero‐LEDs as a promising next‐generation display technology. Extensive research review articles on the compositional engineering defect passivation of perovskite layers substantially contributed development multi‐color high‐efficiency Pero‐LEDs. However, crucial aspect charge transport layer (CTL) modulation in remains relatively underexplored. CTL not only impacts carrier injection balance but also plays critical role passivating surface, blocking ion migration, enhancing crystallinity, improving light extraction efficiency. Therefore, optimizing CTLs is pivotal for further Pero‐LED performance. Herein, this discusses roles categorizes both reported potential materials. Then, various optimization strategies are presented, alongside an analysis selection criteria high‐performance Finally, summary outlook advance performances provided.

Language: Английский

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Synergistic Hybrid‐Ligand Passivation of Perovskite Quantum Dots: Suppressing Reduced‐Dimensionality and Enhancing Optoelectronic Performance

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 29, 2025

Abstract In terms of surface passivation for realizing efficient CsPbI 3 ‐perovskite quantum dot (CsPbI ‐PQD)‐based optoelectronic devices, phenethylammonium iodide (PEAI) is widely used during the ligand exchange. However, PEA cation, due to its large ionic radius incompatible with 3D perovskite framework, acts as an organic spacer within polycrystalline perovskites, leading formation reduced dimensional perovskites (RDPs). Despite sharing identical influence PEAI on structure ‐PQDs remains unexplored. Here, it revealed that can induce high‐n RDPs ( n > 2) ‐PQD solids, but these undergo undesirable phase transition low‐n RDPs, structural and optical degradation ‐PQDs. To address PEAI‐induced issue, we employ triphenylphosphine oxide (TPPO) ancillary exchange process. The incorporation TPPO prevents H 2 O penetration regulates rapid diffusion PEAI, suppressing RDPs. Moreover, passivate uncoordinated Pb 2+ sites, reducing nonradiative recombination. This hybrid‐ligand strategy using both enables stable ‐PQD‐based light‐emitting diode (external efficiency 21.8%) solar cell (power conversion 15.3%) devices.

Language: Английский

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