Nucleophilic Reaction‐Enabled Chloride Modification on CsPbI₃ Quantum Dots for Pure Red Light‐Emitting Diodes with Efficiency Exceeding 26 %

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(11)

Published: Jan. 23, 2024

Abstract High‐performance pure red perovskite light‐emitting diodes (PeLEDs) with an emission wavelength shorter than 650 nm are ideal for wide‐color‐gamut displays, yet remain unprecedented challenge to progress. Mixed‐halide CsPb(Br/I) 3 emitter‐based PeLEDs suffer spectral stability induced by halide phase segregation and CsPbI quantum dots (QDs) from a compromise between electroluminescence efficiency. Here, we demonstrate efficient centered at 638 based on PbCl x ‐modified QDs. A nucleophilic reaction that releases chloride ions manipulates the ligand equilibrium of colloidal system is developed synthesize The comprehensive structural spectroscopic characterizations evidence formation outside QDs, which regulates exciton recombination prevents dissociation surface defects. In consequence, QDs superior optoelectronic properties stable spectra high driving voltages, record external efficiency 26.1 %, optimal roll‐off 16.0 % 1000 cd m −2 , half lifetime 7.5 hours 100 representing state‐of‐the‐art PeLEDs. This work provides new insight into constructing carrier‐confined structure high‐performance

Language: Английский

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Perovskite Quantum Dots for the Next‐Generation Displays: Progress and Prospect

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(36)

Published: March 5, 2024

Abstract The “Nobel Prize in Chemistry 2023” is awarded to Moungi G. Bawendi, Louis E. Brus, and Alexey I. Yekimov for discovering synthesizing Quantum Dots (QDs). Colloidal QDs possess fascinating size‐, morphological‐, composition‐, assembly‐tunable electronic optical properties, which makes them star materials various optoelectronic applications, especially as luminescent next‐generation wide color gamut ultra‐high‐definition displays. Perovskite (PQDs) have gained widespread attention recent years. In less than ten years, research on perovskite‐related devices has basically been perfected terms of quantum yield external efficiency (EQE). However, the eve its industrial application, some key technical indicators processes need be met resolved. development transformation QD then focuses progress luminescence linewidth EQE PQD light‐emitting diode. Finally, several application avenues are reviewed PQDs, challenges opportunities field proposed.

Language: Английский

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Spontaneous crystallization of strongly confined CsSnxPb1-xI3 perovskite colloidal quantum dots at room temperature

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Feb. 21, 2024

The scalable and low-cost room temperature (RT) synthesis for pure-iodine all-inorganic perovskite colloidal quantum dots (QDs) is a challenge due to the phase transition induced by thermal unequilibrium. Here, we introduce direct RT strongly confined spontaneous crystallization strategy in Cs-deficient reaction system without polar solvents synthesizing stable tin-lead (Sn-Pb) alloyed QDs, which exhibit bright yellow luminescence. By tuning ratio of Cs/Pb precursors, size confinement effect optical band gap resultant CsSn

Language: Английский

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Acidic Engineering on Buried Interface toward Efficient Inorganic CsPbI₃ Perovskite Light-Emitting Diodes

Nano Letters, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 17, 2025

Inorganic CsPbI3 perovskite has emerged as a promising emitter for deep-red light-emitting diodes (LEDs) due to its intrinsic thermal stability and suitable bandgap. However, uncontrollable crystallization induced by an alkaline zinc oxide (ZnO) substrate in bulk film-based LEDs leads insufficient external quantum efficiencies (EQEs) at high brightness, leaving obstacles commercialization progress. Herein, we demonstrate effective acidic engineering strategy with wide applicability modify the surface property of ZnO regulate crystallization. Via systematically selecting 1,4-cyclohexanedicarboxylic acid mild dissociation constant functionalize buried interface, mitigate speed deprotonation reaction achieve homogeneous films phase purity fewer defects. The resulting (PeLEDs) exhibit record EQE 19.4% luminance 3400 cd m–2, representing state-of-art PeLEDs. These findings provide valuable insights advancement efficient

Language: Английский

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Light‐Emitting Diodes Based on Metal Halide Perovskite and Perovskite Related Nanocrystals

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

Published: Jan. 29, 2025

Abstract Light‐emitting diodes (LEDs) based on halide perovskite nanocrystals have attracted extensive attention due to their considerable luminescence efficiency, wide color gamut, high purity, and facile material synthesis. Since the first demonstration of LEDs MAPbBr 3 was reported in 2014, community has witnessed a rapid development performances. In this review, historical perspective is provided then comprehensive survey current strategies for high‐efficiency lead‐based LEDs, including synthesis optimization, ion doping/alloying, shell coating presented. Then basic characteristics emission mechanisms lead‐free perovskite‐related emitters environmentally friendly from standpoint different colors are reviewed. Finally, progress LED applications covered an outlook opportunities challenges future developments field provided.

Language: Английский

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p-π Conjugated L-Type Ligand for Pure-Red Perovskite Light-Emitting Diodes

ACS Energy Letters, Journal Year: 2024, Volume and Issue: 9(3), P. 1125 - 1132

Published: Feb. 22, 2024

High-performance pure-red perovskite light-emitting diodes (PeLEDs) with luminescence peaks around 630 nm are desirable for displays, yet the brightness and operational stability remain critical factors limiting their applications. Here, we report high-luminance long-life PeLEDs achieved by 4-fluorobenzenesulfonamide (4-FBSA) anchored CsPb(Br/I)3 nanocrystals (NCs). Theoretical simulation experimental results confirm p-π conjugated moiety, electronegative atoms weaken capability of nitrogen to accept foreign protons, allowing 4-FBSA act as an L-type ligand under acid-amine circumstance strongly coordinate NC surface. The firmly bonded not only passivates surface defects but also enhances NCs. resultant device exhibits a remarkable luminance 21 590 cd m–2, peak efficiency 21.8%, extended half-lifetime 11.7 h negligible spectral shifting broadening during operation, signifying advancement Rec.2020 mix-halide emitters toward display

Language: Английский

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Modulation of Nucleation and Growth Kinetics of Perovskite Nanocrystals Enables Efficient and Spectrally Stable Pure-Red Light-Emitting Diodes

Nano Letters, Journal Year: 2024, Volume and Issue: 24(18), P. 5631 - 5638

Published: April 26, 2024

Perovskite light-emitting diodes (PeLEDs) based on CsPb(Br/I)

Language: Английский

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Low-Temperature fabrication of CsPbI3@PVA films for Ultra-Stable Down-Conversion white Light-Emitting Diodes: From molecular interactions to phase stability

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 159494 - 159494

Published: Jan. 1, 2025

Language: Английский

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Copper-Doped CsPbI₃ Nanocrystals: Improved Stability and Ultrafast Photophysical Dynamics

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

Published: Jan. 26, 2025

Language: Английский

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Roadmap on metal-halide perovskite semiconductors and devices

Materials Today Electronics, Journal Year: 2025, Volume and Issue: unknown, P. 100138 - 100138

Published: Jan. 1, 2025

Language: Английский

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