Eliminating Chlorine Vacancies of Perovskite Nanocrystals Using Hydrazine Cations Enables Efficient Pure Blue Light-Emitting Diodes

ACS Energy Letters, Год журнала: 2024, Номер 9(3), С. 1210 - 1218

Опубликована: Фев. 26, 2024

Mixed Br/Cl-perovskite nanocrystals (Pe-NCs) CsPbBrxCl3–x, synthesized at room temperature (RT), offer several advantages for use in light-emitting diodes (LEDs), including cost-effective processing and a narrow luminescence peak. However, achieving efficient pure blue LEDs using CsPbBrxCl3–x NCs has been proven to be challenging due significant number of chlorine defects. In this work, we propose passivation strategy utilizing hydrazine cations (Hz2+) eliminate defects RT-synthesized Pe-NCs. Our investigation reveals that Hz2+ can capture the isolated anion (Cl–) form Hz–Cl–Cs bridge on Pe-NC surface, thereby effectively inhibiting formation vacancies. This approach significantly enhances both photoluminescence efficiency lifetime Consequently, fabricated Hz2+-passivated Pe-NCs achieve an outstanding external quantum (EQE) 7.82% 475 nm. findings highlight effective mitigates Pe-NCs, advancing development LEDs.

Язык: Английский

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Organic Hole‐Transport Layers: An Innovative Approach for Efficient Perovskite Light‐Emitting Diodes

Advanced Optical Materials, Год журнала: 2024, Номер 12(17)

Опубликована: Фев. 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.

Язык: Английский

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Self-assembled mono-hole-injecting layers towards efficient deep-blue perovskite light-emitting diodes

Applied Surface Science, Год журнала: 2024, Номер 655, С. 159643 - 159643

Опубликована: Фев. 9, 2024

Язык: Английский

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Exploring Efficient Dual-Phase Emissive Fluorophores with High Mobility by Integrating a Rigid Donor and Flexible Acceptor

ACS Applied Materials & Interfaces, Год журнала: 2024, Номер 16(8), С. 10407 - 10416

Опубликована: Фев. 16, 2024

Developing luminogens with a high emission efficiency in both single-molecule and aggregate states, as well mobility, shows promise for advancing the iteration update of organic optoelectronic materials. However, achieving delicate balance between plane configuration luminophores strong exciton interactions aggregates is formidable task from molecular design perspective. This dilemma was overcome by integrating rigid donor flexible acceptor to establish donor–acceptor (D–A) type emitters. The π-conjugate-extended ensures substantial planarity these molecules, allowing solution photoluminescence quantum yield values 86% 75%. Furthermore, restricted motion aggregation-induced moiety formation J-aggregates reduce quenching effect, leading emissive 85% 91% state. mildly distorted D–A geometry builds moderate electrostatic interaction, resulting mobility μM,h 7.12 × 10–5 3.27 10–4 cm2/V s. Additionally, an improved synthesized procedure terminal E-configured acrylonitrile metal-free concise reaction conditions presented. successful application compounds light-emitting diode devices demonstrates practicability strategy connecting acceptor.

Язык: Английский

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Defect Passivating Hole Transporting Material for Large-Area and Stable Perovskite Quantum-Dot Light-Emitting Diodes

ACS Nano, Год журнала: 2025, Номер unknown

Опубликована: Фев. 11, 2025

Organic hole-transporting materials (HTMs) with high hole mobility and a defect passivating ability are critical for improving the performance stability of perovskite optoelectronics, including quantum dot light-emitting diodes (Pe-QLEDs) solar cells. In this study, we designed two small-molecule HTMs, termed X13 X15, incorporating methylthio group (SMe) as defect-passivating sites to enhance interaction between HTMs layer Pe-QLED applications. Our study highlights that featuring SMe groups at para-position carbazole unit, demonstrates strong superior passivation effects dots. Consequently, Pe-QLEDs (0.09 cm2) X15 HTM achieve maximum external efficiency (EQE) 22.89%. Moreover, employing in large-area (1 yields an EQE 21.10% uniform light emission, surpassing PTAA-based devices (EQE ∼ 15.03%). finding provides crucial insights into molecular design related optoelectronic devices.

Язык: Английский

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Fused Carbazole‐based Self‐Assembled Monolayers Enable Efficient Perovskite Solar Cells and Perovskite Light‐Emitting Diodes

Advanced Optical Materials, Год журнала: 2024, Номер 12(33)

Опубликована: Авг. 22, 2024

Abstract Carbazole‐derived self‐assembled monolayers (SAMs) with excellent hole‐extraction and injection properties are promising hole‐transporting materials for perovskite optoelectronic devices, including solar cells (PSCs) light‐emitting diodes (PeLEDs). The performance thermal stability of these SAMs heavily influenced by their chemical structure. Herein, the construction fused carbazole‐based is proposed expanding π‐conjugation carbazole unit application in PSCs PeLEDs. Three proof‐of‐concept designed synthesized, termed XS8 , XS9 XS10 that feature highly rigid planar as donor a conjugated alkene linker. This extension improves planarity, stability, enhances molecular dipole moment. Among these, highest degree conjugation, demonstrated superior perovskite‐based devices. PSC device utilizing achieves maximum power conversion efficiency (PCE) 20.28%, surpassing 17.19% PCE classic 2PACz‐based device. Similarly, PeLED external quantum (EQE) 16.6%, compared to 14.5% PEDOT‐based work provides novel design strategy creating efficient stable optoelectronics other organic electronic

Язык: Английский

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Cold sintering of CsPbBr3 quantum dots embedded KBr ceramics for LED displays

Journal of Materiomics, Год журнала: 2024, Номер unknown, С. 100933 - 100933

Опубликована: Авг. 1, 2024

Язык: Английский

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Balancing multiple properties of small molecule hole-transporting materials towards highly efficient perovskite QLEDs

Chemical Engineering Journal, Год журнала: 2024, Номер 500, С. 157117 - 157117

Опубликована: Окт. 30, 2024

Язык: Английский

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Paving continuous heat dissipation pathways for quantum dots in polymer with orange-inspired radially aligned UHMWPE fibers

Opto-Electronic Advances, Год журнала: 2024, Номер 7(7), С. 240036 - 240036

Опубликована: Янв. 1, 2024

Thermal management of nanoscale quantum dots (QDs) in light-emitting devices is a long-lasting challenge. The existing heat transfer reinforcement solutions for QDs-polymer composite mainly rely on thermal-conductive fillers. However, this strategy failed to deliver the QDs' generation across long distance, and accumulated still causes considerable temperature rise composite, which eventually menaces performance reliability devices. Inspired by radially aligned fruit fibers oranges, we proposed eliminate dissipation challenge establishing long-range ordered pathways within composite. Ultrahigh molecular weight polyethylene (UPEF) were throughout polymer matrix, thus facilitating massive efficient QDs. Under UPEF filling fraction 24.46 vol%, in-plane thermal conductivity QDs-radially (QDs-RAPE) could reach 10.45 W m−1 K−1, highest value reported so far. As proof concept, working can be reduced 342.5 °C when illuminated highly concentrated laser diode (LD) under driving current 1000 mA, improving their optical performance. This work may pave new way next high-power QDs lighting applications.

Язык: Английский

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Unveiling the Influence of Additive Acidity on the Long-Term Stability of Perovskite Solar Cells

ACS Materials Letters, Год журнала: 2024, Номер 7(1), С. 265 - 274

Опубликована: Дек. 17, 2024

Additive engineering plays a vital role in enhancing perovskite solar cells (PSCs) by passivating defects within the films. Carboxyl and ester groups are commonly used for their strong binding with under-coordinated Pb2+ ions. However, impact of additive acidity on long-term stability PSCs remains unclear. This study investigates functional roles 4-amino-3,5-difluorobenzoic acid (DFAB-A) methyl 4-amino-3,5-difluorobenzoate (DFAB-AM), which could effectively passivate film defects. resulting from carboxyl deprotonation DFAB-A negatively impacts structural perovskites. In contrast, DFAB-AM its functionality forms stronger more stable bonds, contributing to improved passivation stability. incorporating achieve high power conversion efficiency 22.51% maintain 84.3% initial after 800 h maximum-power-point operation. These findings underscore importance carbonyl group design developing molecular additives enhance both durability PSCs.

Язык: Английский

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