Bilateral Embedded Anchoring via Tailored Polymer Brush for Large‐Area Air‐processed Blue Light‐Emitting Diodes DOI
Jiandong Wu, Huixin Li, Yang Yang

et al.

Angewandte Chemie, Journal Year: 2024, Volume and Issue: 136(43)

Published: July 27, 2024

Abstract Perovskite light‐emitting diodes (PeLEDs) that can be air‐processed promises the development of displaying optoelectronic device, while is challenged by technical difficulty on both active layer and hole transport (HTL) caused unavoidable humidity interference. Here, we propose validate that, planting polymer brush with tailored functional groups in inorganic HTL, provides unique bilateral embedded anchoring capable simultaneously addressing n phases crystallization rates as well deteriorated particulate surface defects HTL. Exemplified zwitterionic polyethyleneimine‐sulfonate (PEIS) present study, its implanting NiO x HTL offers abundant nuclei sites amino sulfonate balance growth rate different quasi‐2D perovskite films. Moreover, PEIS effectively nailed interfacial contact between , reduced leading to enhanced PLQY stability large‐area blue film ambient air. By virtue these merits, work achieves first demonstration PeLEDs large emitting area 1.0 cm 2 peak external quantum efficiency (EQE) 2.09 %, which comparable similar pure‐bromide fabricated glovebox.

Language: Английский

Multifunctional Additives with Cation−π Interactions Enable High-Performance Blue Perovskite Light-Emitting Diodes DOI

Shuxin Wang,

Zhiqiu Yu,

Xiang‐Feng Yang

et al.

ACS Energy Letters, Journal Year: 2025, Volume and Issue: unknown, P. 1183 - 1191

Published: Feb. 11, 2025

Language: Английский

Citations

1
Organic Hole‐Transport Layers: An Innovative Approach for Efficient Perovskite Light‐Emitting Diodes DOI
Amjad Islam,

Syed Hamad Ullah Shah,

Zeeshan Haider

et al.

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: 12(17)

Published: Feb. 29, 2024

Abstract Organic–inorganic‐halide‐perovskite (OIHP) based light‐emitting diodes (LEDs) are becoming more and well‐described as having multiple potential uses in lighting display technology, owing to their broad color gamut high purity. Recent research reveals that hole‐transport layers (HTLs) perform crucial roles realizing high‐performance highly stable perovskite (PeLEDs). However, the exploration of organic HTLs for obtaining efficient PeLEDs has lagged behind compared electron‐transport layers. In past few years, some innovative have been developed PeLEDs, which demonstrated excellent performances devices. It established HTL/OIHP interface a significant impact on crystallization behaviors electrical properties OIHP film. Herein, different types (polymer/small molecule) used discussed. Also, mechanism action those devices is also presented. Moreover, recent progress blue, green, red PeLED highlighted. Furthermore, strategies improve performance existing standard reviewed. Additionally, challenges present technology briefly summarized. Lastly, viewpoints regarding ongoing obstacles forthcoming prospects emphasized.

Language: Английский

Citations

8
Efficient Quasi-2D Perovskite Based Blue Light-Emitting Diodes with Carbon Dots Modified Hole Transport Layer DOI

Hongwei Wang,

Baowei Zhang, Boyang Wang

et al.

Nano Letters, Journal Year: 2024, Volume and Issue: 24(28), P. 8702 - 8708

Published: July 2, 2024

Quasi-2D perovskites based blue light-emitting diodes (LEDs) suffer from its poor electroluminescence performance, mainly caused by the nonradiative recombination in defect-rich low-

Language: Английский

Citations

8
Homogenizing Energy Landscape for Efficient and Spectrally Stable Blue Perovskite Light‐Emitting Diodes DOI

Heng Qi,

Yu Tong, Xuewen Zhang

et al.

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(46)

Published: Sept. 20, 2024

Blue perovskite light-emitting diodes (PeLEDs) have attracted enormous attention; however, their unsatisfactory device efficiency and spectral stability still remain great challenges. Unfavorable low-dimensional phase distribution defects with deeper energy levels usually cause disorder, substantially limiting the device's performance. Here, an additive-interface optimization strategy is reported to tackle these issues, thus realizing efficient spectrally stable blue PeLEDs. A new type of additive-formamidinium tetrafluorosuccinate (FATFSA) introduced into quasi-2D mixed halide accompanied by interface engineering, which effectively impedes formation undesired phases various bandgaps throughout entire film, thereby boosting transfer process for accelerating radiative recombination; this also diminishes vacancies especially chloride-related deep level, reducing nonradiative loss recombination. Benefitting from homogenized landscape emitting layer, PeLEDs spectrally-stable emission (478 nm) champion external quantum (EQE) 21.9% are realized, represents a record value among in pure region.

Language: Английский

Citations

6
Modulation of Charge Transport Layer for Perovskite Light‐Emitting Diodes DOI
Yuqing Li,

Xiang Guan,

Yaping Zhao

et al.

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

Citations

5
Synergistic Steric Effect of Precursor And Antisolvent Enables Strongly Confined Perovskite Films with Efficient and Spectral Stable Blue Emission DOI

Heng Qi,

Yu Tong, Xiuhai Zhang

et al.

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(30), P. 39664 - 39672

Published: July 18, 2024

Reducing the crystal size of perovskites to strong quantum confinement regime is an effective way realize blue luminescence for light-emitting applications. However, challenges remain in directly constraining growth during film preparation achieve three-dimensional confinement, and widely used long-chain ligands may bring difficulties charge transport unfavorably affect device performance. Herein, we report a novel strategy fabricating strongly confined blue-emitting perovskite nanocrystalline films via synergistic steric effect modulation by precursors antisolvents. We synthesize cesium pentafluoropropanoate (CsPFPA) as new type precursor agent, where PFPA group can help constrain crystals passivate defects. Furthermore, different types antisolvents with varied molecular sizes hindrance are regulate improve quality. Consequently, highly emissive realized emission wavelength effectively tuned region varying concentration CsPFPA well Based on films, diodes (LEDs) constructed, showing good spectral tunability stability electroluminescence. This work demonstrates pathway developing bright emitters LEDs, which potentially advance their future applications display lighting.

Language: Английский

Citations

4
Additive‐Driven Enhancement of Crystallization: Strategies and Prospects for Boosting Photoluminescence Quantum Yields in Halide Perovskite Films for Light‐Emitting Diodes DOI Open Access

Shiheng Wang,

Xianglong Sun,

Jiantao Shi

et al.

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

Citations

4
Optimizing Perovskite Surfaces to Enhance Post‐Treatment for Efficient Blue Mixed‐Halide Perovskite Light‐emitting Diodes DOI Creative Commons

Aqiang Liu,

Zheng Zhang, Jing Li

et al.

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

Published: Dec. 4, 2024

Abstract The halide postdeposition treatment technique is a widely used strategy for mitigating defects in perovskite. However, when applied to mixed‐halide perovskites, it often leads surface and internal heterogeneity, which compromises luminescence performance spectral stability. In this work, blue 3D perovskites are engineered with acetate (Ac⁻)‐rich surfaces optimize the post‐treatment process achieve homogeneity. findings demonstrate that strong interaction between Ac⁻ ions Pb 2+ significantly reduces formation of vacancy caused by washing effect isopropanol during post‐treatment. This defect reduction slows infiltration into perovskite lattice, providing more time reconstruction minimizing accumulation introduced at surface. As result, mild redistribution occurs, promoting uniform phase. approach enabled development PeLEDs record external quantum efficiency 19.28% (emission peak 482 nm), comparable state‐of‐the‐art reduced‐dimensional perovskite‐based PeLEDs. Additionally, device demonstrated narrowband stable electroluminescence spectrum full width half maximum (FWHM) less than 16 nm.

Language: Английский

Citations

4
Optimizing the Hole-Transport Layer with Ammonium Thiocyanate for Enhanced Performance in Lead-Free Perovskite Light-Emitting Diodes DOI

Li Li,

Jiaying Xu, Jing Liu

et al.

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

Published: Jan. 7, 2025

Tin-based perovskite materials are arising as promising contenders for high-efficiency pure-red light-emitting diodes. However, the primary limitation to external quantum efficiency (EQE) of tin-based diodes (Sn-PeLEDs) stems from rapid crystallization processes and adverse P-type self-doping effects. In this study, we have effectively controlled speed perovskites through rational interfacial engineering improved stability tin halide film. We utilized ammonium thiocyanate (NH4SCN) alter properties hole-transport layer, which consists poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS). Thiocyanate ions (SCN–) can form interactions with Sn–I frameworks. This not only slows rate but also suppresses oxidation Sn2+, enhancing its passivating defects associated undercoordinated Sn2+. results in smooth, uniform, compact thin films that eliminate Sn4+ within resulting film, leading enhanced radiative recombination. Sn-PeLEDs devices achieving a peak EQE 5.8%, approximately 4.6-fold higher than control device. Additionally, Commission Internationale de L'Eclairage (CIE) coordinates (0.69, 0.31) demonstrate close conformity National Television System Committee (NTSC) standardized red standard, indicating high degree color fidelity.

Language: Английский

Citations

0
Phase Control and Defect Passivation via (2-Aminoethyl)phosphonic Acid-Modified PEDOT:PSS for Blue Perovskite Light-Emitting Devices DOI
Z. Y. Ge, Li Song, Yuan Zhang

et al.

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

Citations

0