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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Post‐Assembled Dipole Benzoic Acids Modified Me‐4PACz for Efficient and Stable Inverted Perovskite Solar Cells

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

Published: Feb. 16, 2025

Abstract Self‐assembled monolayers (SAMs), particularly those molecules composed of carbazole and phosphonic acid, are widely employed as effective hole‐selective layer (HSL) in inverted perovskite solar cells (PSCs). However, the insufficient chemical bond formation with metal oxides (ITO) self‐aggregation solvents acid SAM led to non‐uniform HSL, which turn affect power conversion efficiency (PCE) stability PSCs. Herein, a series benzoic materials (BAs), including p‐fluorobenzoic (FBA) p‐methylbenzoic (MBA), used post‐assembly effectively fill voids between [4‐(3,6‐dimethyl‐9H‐carbazole‐9‐yl)butyl]phosphonic (Me‐4PACz) form denser facilitates passivation buried interface. In addition, post‐assembled BAs different dipole moments can adjust work function Me‐4PACz facilitating transport extraction charge carriers. Consequently, PSCs based on Me‐4PACz/FBA HSL realize champion PCE 25.58%. Moreover, unencapsulated devices maintain 82% 94% after 800 h outdoor storage (RH≈60%) 2000 glove box, respectively. This technique enhances both device, blazing simple pathway for further development

Language: Английский

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Efficient All-Solution-Processed Perovskite Light-Emitting Diodes via a Room-Temperature Vapor-Treated Interlayer

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

Published: Feb. 25, 2025

Metal halide perovskites hold great promise for cost-effective, solution-processed, light-emitting diodes (LEDs) due to their exceptional optoelectronic properties. However, fabricating all-solution-processed perovskite LEDs (PeLEDs) remains challenging because the emitters are susceptible damage from subsequent solution layers. Here, we introduce a novel fabrication method that employs low-pressure-treated electron-transport layer (ETL) at room temperature, complemented by polyethylenimine (PEI) interface modification layer. Notably, optimized PEI-modified CsPbBr3 exposed air exhibits remarkable 3-fold increase in photoluminescence intensity and maintains nearly constant light output over 100 h, compared pristine perovskite. Crucially, incorporation of PEI significantly reduces barrier, mitigates degradation crystals caused water oxygen, minimizes adverse interactions with solvents ETL. As result, PeLEDs incorporating an ETL subjected 20 min low-pressure treatment 1 × 10–1 mbar temperature achieved unprecedented external quantum efficiency up 4.6%, record low turn-on voltage 2.1 V CsPbBr3, operational lifetime approximately 5 times longer than conventional devices. This strategy, both conceptually straightforward easy implement, offers new avenue development future printable PeLEDs.

Language: Английский

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Role of Small Organic Molecules in Perovskite Light‐Emitting Diodes: Applications, Mechanisms and Prospects

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

Published: Feb. 10, 2025

Abstract Perovskite light‐emitting diodes (PeLEDs) has emerged as one of the most promising technologies for next generation lighting and high‐definition display applications due to their exceptional color purity, tunable emission, low material costs. In past eleven years, PeLEDs have made remarkable progress researchers come up with many innovative approaches. Among them, additive engineering based on small organic molecules (SOMs) been demonstrated effective strategies enhance external quantum efficiency (EQE) stability PeLEDs. Notably, champion EQEs red, green, blue devices cannot be realized without participation SOMs. Here, this paper first reviews development PeLEDs, followed by a focused discussion specific application mechanism SOMs in Lastly, it analyzes challenges provides an outlook future development.

Language: Английский

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Directed Anion Diffusion Induces Defect Passivation in 0D/3D Perovskite Single‐Crystal Heterostructures

Small, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 11, 2025

Abstract 0D/3D perovskite heterostructures have been extensively utilized in optoelectronic devices. However, synthesizing with well‐defined interfaces, high‐exposure crystal facet orientations, and high‐purity phases remains challenging due to their soft ionic nature, which complicates the understanding of ion defect passivation mechanisms these heterostructure systems. In this study, a one‐step vapor‐phase epitaxial growth pure‐phase single‐crystal is reported interfaces. Through combination various situ measurements theoretical calculations, it elucidated that arises from diffusion bromide anions 0D phase across interface, effectively compensating for vacancies 3D component. The exhibit enhanced stability physical optical properties compared pure perovskites. Furthermore, observed decrease anion kinetic energy (from heterointerface) provides direct evidence bromide‐rich form As anticipated, bulk density estimated be an order magnitude lower than single crystals. first systematic study utilizing model explore self‐passivation mechanisms, work offers crucial insights designing high‐performance

Language: Английский

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Nanocrystalline Perovskites for Bright and Efficient Light‐Emitting Diodes

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

Published: Feb. 19, 2025

Abstract Nanocrystalline perovskites have driven significant progress in metal halide perovskite light‐emitting diodes (PeLEDs) over the past decade by enabling spatial confinement of excitons. Consequently, three primary categories nanocrystalline emerged: nanoscale polycrystalline perovskites, quasi‐2D and nanocrystals. Each type has been developed to address specific challenges enhance efficiency stability PeLEDs. This review explores representative material design strategies for these correlating them with exciton recombination dynamics optical/electrical properties. Additionally, it summarizes trends decade, outlining four distinct phases development. Lastly, this addresses remaining proposes a potential further advance PeLED technology toward commercialization.

Language: Английский

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Full‐Spectrum Carbon Dots Electroluminescent White Light‐Emitting Diodes with a Record Color Rendering Index of 94

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

Published: Feb. 21, 2025

Abstract Carbon dots (CDs) are emerging as promising nanomaterials for next‐generation white electroluminescent devices due to their high photoluminescence quantum yield (PLQY), broad emission spectrum, and compatibility with solution‐processed methods. However, current CD‐based light‐emitting diodes (CDs‐WLEDs) heavily rely on costly commercial host materials struggle low color rendering index (CRI). Herein, a “dual‐phase CDs emitter” strategy is introduced achieve full‐spectrum light emission, without employing materials. As proof of concept, synthesized broadband green nearly 100% PLQY. Spectroscopic structural analyses confirm that luminescence originates from molecular state emission. By combining these carbon dot organic frameworks capable dual blue red emissions, successfully produced record CRI 94 coordinates (0.32, 0.34). This approach provides cost‐effective efficient pathway developing high‐performance WLEDs exclusively CDs.

Language: Английский

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Strategic regulation of crystallization kinetics to achieve efficient pure-red quasi-2D perovskite light-emitting diodes

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 160278 - 160278

Published: Feb. 1, 2025

Language: Английский

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Precise engineering of CsPbI3 nanowires: Aspect ratio tuning and surface modification for improved stability

Journal of Alloys and Compounds, Journal Year: 2025, Volume and Issue: 1016, P. 178971 - 178971

Published: Feb. 1, 2025

Language: Английский

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Minimizing Interfacial Energy Losses with Carbon Dot Bifacial Modification Layers for High‐Efficiency and Stable Perovskite LEDs

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

Published: Feb. 16, 2025

Abstract Perovskite light‐emitting diodes (PeLEDs) have reached near‐unity photoluminescent quantum yields (PLQYs), but further improvements in electroluminescent efficiency are constrained by interfacial energy losses between the emissive layer and charge transport layers. In this study, multifunctional carbon dot organic frameworks (CDOFs) introduced as a dual‐interface modification material for perovskite layer. This approach effectively passivates both upper buried interfaces, boosting PLQY to nearly 100% enabling an external of 28.0%. The CDOFs also facilitate balanced injection, achieving low turn‐on voltage only 1.9 V, significantly below bandgap voltage. Additionally, exceptional defect passivation imparted bolsters structural stability, T 50 operational lifetime 81.7 min at initial ultrahigh luminance 10 000 cd m −2 , with no detectable Joule heating. study underscores potential advancing PeLED performance.

Language: Английский

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