High‐Performance Sky‐Blue Perovskite Spin‐Light Emitting Diodes Due to Chiral Ionic Liquid Implantation and Passivation

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

Published: March 3, 2025

Abstract In chiral hybrid perovskites (CHPs), the generation of polarized spin current and manipulation exciton recombination are expected to produce circularly electroluminescence (CP‐EL) through chiral‐induced selectivity (CISS). It opens a new avenue for developing single junction light‐emitting diodes (spin‐LEDs). The recent challenge lies primarily in balancing device performance CP‐EL polarization. Beyond this, blue spin‐LEDs have not been fully realized. lacks studies interior spin‐chiroptical properties. Herein, promising chirality transfer methodology is initiated fabricating sky‐blue (≈491 nm) using synthesized ionic liquids (CILs). They on one side yield material passivation, giving rise chiroptical (EL) An optimal external quantum efficiency (EQE) 13.0% with dissymmetry factor 0.158 obtained. Importantly, this method leads elevation orbit coupling (CISOC) strength up 0.9717 eV A, long decay lifetime over 1 ns A large approximately 75% achieved ambient conditions. This work unlocks spin‐LEDs, further construction spin‐chiroptics relationship.

Language: Английский

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Dual‐Function Self‐Assembled Molecules as Hole‐Transport Layers for Thermally Evaporated High‐Efficiency Blue Perovskite Light‐Emitting Diodes

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

Published: Nov. 21, 2024

Thermally evaporated perovskite light-emitting diodes (PeLEDs) hold immense potential for future applications in the display industry. However, performance of blue PeLEDs is far behind, one most important reasons lack suitable hole-transporting materials. Herein, study designs and synthesizes a new class self-assembled monolayer (SAM) materials, namely, (2-(3,6-bis(4-formylphenyl)-9H-carbazol-9-yl)ethyl)phosphonic acid (C-2PACz) (2-(3,6-bis(4-(methylsulfonyl)phenyl)-9H-carbazol-9-yl)ethyl)phosphonic (S-2PACz). First, phosphonic induced to form bidentate bonds with ITO. Second, strong electron-withdrawing groups are integrated increase electron cloud density termini contacting perovskite, which enhances electrostatic interaction Pb

Language: Английский

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High‐Brightness Blue Perovskite Light‐Emitting Diodes With Low Efficiency Roll‐Off Enabled by Dual‐ETL and Hole Transport Regulation

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

Published: March 26, 2025

Abstract Metal halide‐based perovskite light‐emitting diodes (PeLEDs) have emerged as promising candidates for next‐generation commercial displays due to their high color purity and recent dramatic improvements in device efficiency. However, the performance of blue PeLEDs still falls far short commercialization requirements, largely because achieving both external quantum efficiency (EQE) brightness simultaneously remains a significant challenge. Here, facile synergistic regulation strategy is presented address charge balance issue by incorporating ethanolamine ethanol additives into poly(3,4‐ethylenedioxythiophene) (styrene sulfonate) (PEDOT: PSS) hole transport layer (HTL), complemented dual electron (ETL) structure. The cosolvent‐assisted PEDOT: PSS enables systematic modulation injection/transport barrier alleviates exciton quenching at HTL/perovskite interface. Crucially, introduction 4,6‐bis(3,5‐di(pyridin‐3‐yl)phenyl)‐2‐methyl pyrimidine (B3PymPm) part ETLs not only optimizes energy level structure but also enhances carrier strengthens confinement. As consequence, PeLED based on optimized charge‐carrier exhibits reduced turn‐on voltage 2.7 V, an unprecedented luminance 2809 cd m − 2 , maximum EQE exceeding 7.6%, while maintaining 7.2% 2000 extended operational lifetime.

Language: Английский

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Multiple Chemical Interactions in Additive Engineering of Perovskite for Enhanced Efficiency and Stability of Pure Blue Light-Emitting Diodes

The Journal of Physical Chemistry Letters, Journal Year: 2025, Volume and Issue: 16(9), P. 2196 - 2203

Published: Feb. 21, 2025

Additive engineering is extensively employed in perovskite light-emitting diodes (PeLEDs) to enhance the device performance. However, effectiveness of additives restricted, as they generally interact with only one or two components within structure. Consequently, these are unable fulfill comprehensive functional requirements imposed by materials. In this work, we successfully designed and synthesized a multifunctional additive N-(perfluorophenyl)-P,P-diphenylphosphinic amide (PFNPO) via one-step synthesis approach. Multiple chemical interactions can be provided between PFNPO different components, thereby effectively modulating quasi-two-dimensional (quasi-2D) crystallization, passivating coordination-unsaturated Pb defects, suppressing halide ion migration simultaneously. Based on synergistic effects, incorporation pure blue quasi-2D PeLEDs resulted significant enhancement external quantum efficiency from 1.83 4.26%, an operational lifetime that was extended more than 3-fold, improved spectral stability at 466 nm.

Language: Английский

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High-Performance Pure Blue Perovskite Light-Emitting Diodes with Mixed Ionic Liquid Interlayer for Micro Light-Emitting Diodes

Published: Jan. 1, 2025

Language: Английский

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