Blue perovskite LEDs: A comprehensive review of emission control strategies for enhanced performance

Coordination Chemistry Reviews, Journal Year: 2025, Volume and Issue: 528, P. 216425 - 216425

Published: Jan. 4, 2025

Language: Английский

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Additive‐Driven Enhancement of Crystallization: Strategies and Prospects for Boosting Photoluminescence Quantum Yields in Halide Perovskite Films for Light‐Emitting Diodes

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

Published: Nov. 6, 2024

Abstract Halide perovskite light‐emitting diodes (PeLEDs) hold great potential for applications in displays and lighting. To enhance the external quantum efficiency (EQE) of PeLEDs, it is crucial to boost photoluminescence yield (PLQY) films. The use additives has emerged as a powerful chemical strategy control crystallization process solution‐processed different types that can be used reflect various interactions with materials, influencing their possible ways. Understanding relationship between these impact on key step designing emitters improved PLQY devices superior EQE. Following logic chain additive–perovskite interactions, impacts crystallization, subsequent enhancement EQE, this review discusses how play pivotal role Furthermore, assessment addresses open challenges outlines future prospects development PeLEDs.

Language: Английский

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Phase Control and Defect Passivation via (2-Aminoethyl)phosphonic Acid-Modified PEDOT:PSS for Blue Perovskite Light-Emitting Devices

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

Published: Jan. 14, 2025

Achieving pure blue emission of perovskite light-emitting diodes (PeLEDs) is great importance for fulfilling full-color display and lighting applications. However, achieving high-performance PeLEDs in bromide quasi-2D (Q2D) perovskites has always been a formidable challenge. Here, an interface engineering strategy proposed to regulate the light color device photoelectric performance simultaneously by employing (2-aminoethyl)phosphonic acid (AEP)-modified poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS). The AEP-PEDOT:PSS not only enhances wettability toward precursor but also coordinates with unsaturated Pb atoms, facilitating growth nanocrystals fewer defects. Thereby, shifted from sky-blue region higher PLQY was achieved. Additionally, incorporation AEP reduces conductivity PEDOT:PSS film, enabling more balanced charge transport device. Consequently, modification achieve external quantum efficiency (EQE) 5.2%, approximately 1.9 times that control Our findings may provide valuable insights helpful guidance development Q2D LEDs.

Language: Английский

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Emission-Tunable Quasi-2D (PEA)₂FA_n–1Pb_nBr_3n+1 Perovskite Films via an A-Site Cation-Assisted Strategy for Light-Emitting Diodes

The Journal of Physical Chemistry C, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 29, 2025

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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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Custom‐Tailored Surface Morphology for Efficient Quasi‑2D Perovskite Light‑Emitting Diodes

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

Published: April 14, 2025

Abstract Quasi‐2D perovskite light‐emitting diodes (Pero‐LEDs) are promising for next‐generation lightings and displays, yet their performance remains constrained by unbalanced carrier injection non‐radiative recombination. In this study, a precise step‐wise antisolvent processing technique is presented to engineer custom‐tailored hillock‐shaped morphologies in quasi‐2D films. The controlled quasi‑2D films not only enhance electron efficiency increasing the contact area between emitting layer transport layer, but also simultaneously improve crystallization quality reduce defect density. As result, optimized devices achieve maximum external quantum (EQE max ) of 26.25% threefold increase luminance compared control devices. This work provides straightforward scalable approach morphology control, paving way high‐performance optoelectronic

Language: Английский

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Manipulating Phase and Defect Distribution of Quasi-2D Perovskites via a Synergistic Strategy for Enhancing the Performance of Blue Light-Emitting Diodes

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

Published: Jan. 23, 2025

Quasi-two-dimensional (quasi-2D) mixed-halide perovskites are a requisite for their applications in highly efficient blue perovskite light-emitting diodes (PeLEDs) owing to strong quantum confinement effect and high exciton binding energy. The pace of quasi-2D PeLEDs is hindered primarily by two factors: challenges precisely managing the phase distribution defect-mediated nonradiative recombination losses. Herein, we utilize 2,2-diphenylethylamine (DPEA+) with bulky steric hindrance disturb assembly process slender spacer host cation, 4-fluorophenylethylammonium (p-F-PEA+), enhancing management PeLEDs. DPEA+ not only inhibits small-n but also strengthens carrier transport alleviates quenching. In addition, dual additives─formamidine acetate (FAoAc) guanidine thiocyanate (GASCN)─were incorporated assist tailoring passivation remaining defects films. C═O SCN- groups can coordinate Pb2+ suppress charge trap density recombination. As result employing synergetic strategy comprehensive regulation defect passivation, optimized device achieves emission at 479 nm 5× improvement external efficiency (EQE) 13× increase operating stability. This paves simple route toward high-performance blue-emission

Language: Английский

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Exciton Dynamics in Layered Halide Perovskite Light‐Emitting Diodes

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

Published: Nov. 20, 2024

Abstract Layered halide perovskites have garnered significant interest due to their exceptional optoelectronic properties and great promises in light‐emitting applications. Achieving high‐performance perovskite diodes (PeLEDs) requires a deep understanding of exciton dynamics these materials. This review begins with fundamental overview the structural photophysical layered perovskites, then delves into importance dimensionality control cascade energy transfer quasi‐2D PeLEDs. In second half review, more complex dynamics, such as multiexciton processes triplet from perspective LEDs are explored. Through this comprehensive an in‐depth critical aspects impacts on future research technological advancements for PeLEDs is provided.

Language: Английский

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