Designing high-performance pure-red metal halide perovskite materials and light-emitting diodes for Rec. 2020 display

Nano Energy, Journal Year: 2024, Volume and Issue: 122, P. 109339 - 109339

Published: Jan. 26, 2024

Language: Английский

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

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

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Superbly Bright Tin‐Based Perovskite LEDs

Laser & Photonics Review, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 16, 2025

Abstract Tin (Sn)‐based perovskites have made notable advances with external quantum efficiency of over 20%, but still exhibit low electroluminescence brightness insufficient for outdoor displays. Here, it is demonstrated that compact phenethylammonium tin iodide (PEA 2 SnI 4 ) films an intact crystal structure can offer high luminance by optimizing the perovskite crystallization rate simultaneously engineering grain surface. Ammonium thiocyanate added to precursor solution generate film PEA x SCN 4‐ and NH I after spin‐coating. Sn 2+ − a strong interaction slows improve quality. During subsequent annealing, from replaces in forming thiourea, which escape leave crystals. It found optimized emitting layers provide outstanding coverage, crystallinity, trap state density, superior photophysical performance. Consequently, impressive 8285 cd m −2 pure red achieved, first report Sn‐based light‐emitting diodes meet display requirements.

Language: Английский

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Challenges and Future Prospects of Organic Photovoltaics for Underwater Applications

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

Published: Feb. 25, 2025

Abstract This perspective explores the potential of organic photovoltaics (OPVs) for underwater applications, focusing on their tunable absorption properties and adaptability to aquatic environment. As OPV is compatible with visible light spectrum in water, it promising integration into Internet Underwater Things (IoUT). discusses challenges water‐induced degradation, attenuation, fouling, highlights strategies address these issues, including material stabilization, advanced encapsulation, antifouling technologies. In addition, importance characterization techniques tailored photovoltaic systems emphasized. By addressing challenges, can become a sustainable energy solution exploration, monitoring, smart networks.

Language: Английский

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Push‐Pull Effect Enables Large‐Area Lead‐Free Perovskite Light‐Emitting Diodes via Electron Directional Transfer

Laser & Photonics Review, Journal Year: 2025, Volume and Issue: unknown

Published: May 19, 2025

Abstract Tin (Sn) perovskites have emerged as viable candidates for high‐performance, lead‐free perovskite light‐emitting diodes (PeLEDs). However, the limited availability of efficient and stable Sn perovskites, development large‐area PeLEDs encourage further research. Here, FPEA 2 SnI 4 (FPEAI, 4‐fluoro‐phenethylammonium iodide) is reported a potential emitter PeLEDs. To overcome anisotropic carrier transport in layered an electronic push‐pull effect strategy introduced by incorporating 6‐amino‐4‐hydroxy‐2‐naphthalenesulfonic acid (γ acid) molecule perovskites. The unique electronically configuration γ establishes cross‐layer electron transfer channel, which mitigates aggregation within organic layers, enhances injection directional transfer, effectively promotes radiative recombination. Furthermore, multifunctional provides multiple interaction sites reducing defect state density stabilizing Leveraging enhanced robustness films with acid, PeLED active area 2.25 cm , achieves maximum luminance ( L max ) 371 cd m −2 peak external quantum efficiency (EQE) 15.49%, operational half‐lifetime 71.6 h at 100 . These findings underscore application realms solid‐state lighting planar display.

Language: Английский

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Dual functionality of carbazole-based phosphonic acid molecular additives realizes efficient hole transport layer-free perovskite light-emitting diodes

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: unknown, P. 158876 - 158876

Published: Dec. 1, 2024

Language: Английский

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Synergetic Dual‐Additive Strategy for Regulating Crystallization and Defect Passivation of Perovskite Nanograin Toward Efficient Light‐Emitting Diodes

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

Published: Nov. 29, 2024

Abstract Perovskite nanograins with a dimension larger than the Bohr exciton diameter have significant advantages in achieving high‐performance light‐emitting diodes (LEDs) due to their bandgap uniformity and strong charge confinement effect. However, perovskite nanograin films prepared by solution spin‐coating method are prone produce massive defects fast crystallization rate, leading severe nonradiative recombination that greatly detracts performance of LEDs. Therefore, regulating minimizing plays crucial role development for Herein, simple dual‐additive strategy is reported manipulate growth high‐quality CsPbBr 3 ‐based films. A multifunctional additive 5‐aminovaleric acid (5AVA) introduced slow down rate , followed further addition triphenylphosphine oxide (TPPO) achieve effective synergistic passivation defects, which can significantly enhance radiative reduce defects‐induced recombination. Ultimately, based on 5AVA TPPO co‐modified nanograins, LEDs fabricated maximum external quantum efficiency (EQE) 20.95% an average EQE approaching 20%, demonstrating excellent reproducibility. This work provides new insight into regulation defect improvement device performance.

Language: Английский

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Natural and Nature‐Inspired Biomaterial Additives for Metal Halide Perovskite Optoelectronics

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

Published: Nov. 10, 2024

This comprehensive review meticulously categorizes and discusses the applications of diverse biomaterials, specifically natural nature-inspired synthetic materials in metal halide perovskite optoelectronics. Applications range from solar cells to light-emitting diodes, photodetectors, X-ray detectors. Emphasis is placed on intricate interactions between bio-additives crystals, highlighting their influence grain size, crystal orientation, boundaries, surface passivation. also explores advantages disadvantages each or material unique properties compared with conventional additives. Special attention given mechanistic functional viewpoints, showing how these biomaterials enhance device performance. Through additive engineering ecofriendly defects thin films can be effectively passivated, thus extending photostability some cases mechanical flexibility devices. provides valuable insights for selecting designing next-generation biomaterial additives, offering new prospects achieving high-performance layers advancing field peorvskite- based

Language: Английский

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