Efficient and large-area all vacuum-deposited perovskite light-emitting diodes via spatial confinement

Nature Communications, Journal Year: 2021, Volume and Issue: 12(1)

Published: Aug. 6, 2021

Abstract With rapid advances of perovskite light-emitting diodes (PeLEDs), the large-scale fabrication patterned PeLEDs towards display panels is increasing importance. However, most state-of-the-art are fabricated by solution-processed techniques, which difficult to simultaneously achieve high-resolution pixels and production. To this end, we construct efficient CsPbBr 3 employing a vacuum deposition technique, has been demonstrated as successful route for commercial organic LED displays. By carefully controlling strength spatial confinement in film, its radiative recombination greatly enhanced while nonradiative suppressed. As result, external quantum efficiency (EQE) thermally evaporated PeLED reaches 8.0%, record processed PeLEDs. Benefitting from excellent uniformity scalability thermal evaporation, demonstrate with functional area up 40.2 cm 2 peak EQE 7.1%, representing one large-area We further film 100 μm using fine metal masks, laying foundation potential applications. believe strategy regulation perovskites provides an effective way process high-efficiency panels.

Language: Английский

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Intrinsic Self‐Trapped Emission in 0D Lead‐Free (C₄H₁₄N₂)₂In₂Br₁₀ Single Crystal

Angewandte Chemie, Journal Year: 2019, Volume and Issue: 131(43), P. 15581 - 15586

Published: Aug. 26, 2019

Abstract Low‐dimensional lead halide perovskite materials recently have drawn much attention owing to the intriguing broadband emissions; however, toxicity of will hinder their future development. Now, a lead‐free (C 4 H 14 N 2 ) In Br 10 single crystal with unique zero‐dimensional (0D) structure constituted by [InBr 6 ] 3− octahedral and − tetrahedral units is described. The exhibits photoluminescence (PL) that spans almost whole visible spectrum lifetime 3.2 μs. Computational experimental studies unveil an excited‐state structural distortion in enables formation intrinsic self‐trapped excitons (STEs) thus contributing broad emission. Furthermore, femtosecond transient absorption (fs‐TA) measurement reveals ultrafast STEs together efficient intersystem crossing has made significant contribution long‐lived STE‐based emission behavior.

Language: Английский

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Successes and Challenges of Core/Shell Lead Halide Perovskite Nanocrystals

ACS Energy Letters, Journal Year: 2021, Volume and Issue: 6(4), P. 1340 - 1357

Published: March 17, 2021

Newly emerging perovskite nanocrystals (NCs) have shown a huge potential to be utilized in gamut of optoelectronic devices due their superior photoluminescence quantum yield (PLQY), tunable emission wavelength, and facile synthesis protocols at low cost. Despite the enormous progress made synthetic protocol development, poor stability against environmental stressors remains major shortcoming that significantly restricts practical applications future commercialization. Of particular interest, core/shell NC engineering has fueled significant not only improve luminescent properties, reduce exciton recombination, suppress non-radiative enhance charge carrier transport but also, perhaps more importantly, semiconductor materials' under harsh conditions. Accordingly, this architecture represents promising avenue alleviate issue and, therefore, could push devices' operational performance forward. In Focus Review, we explore successes challenges recently reported heterostructures summarize methods, photophysics after shelling, theoretical approaches, applications. Finally, conclude with discussion new opportunities suggestions research area step

Language: Английский

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Highly Luminescent Zero-Dimensional Organic Copper Halides for X-ray Scintillation

The Journal of Physical Chemistry Letters, Journal Year: 2021, Volume and Issue: 12(29), P. 6919 - 6926

Published: July 20, 2021

The present work reports highly efficient flexible and reabsorption-free scintillators based on two zero-dimensional (0D) organic copper halides (TBA)CuX2 (TBA = tetrabutylammonium cation; X Cl, Br). exhibit luminescent green sky-blue emissions peaked at 510 498 nm, with large Stokes shifts of 224 209 nm high photoluminescence quantum yields (PLQYs) 92.8% 80.5% room temperature for (TBA)CuCl2 (TBA)CuBr2 single crystals (SCs), respectively. Interestingly, above temperature, their PLQYs increase reach near unity 320 345 K (TBA)CuBr2, excellent properties originate from self-trapped excitons (STEs) in individual [CuX2]− rods, which is demonstrated by the temperature-dependent PL, ultrafast transient absorption (TA) combined density functional theory (DFT) calculations. show bright radioluminescence (RL), impressive linear response to dose rate a broad range, light yields. Their potential application X-ray imaging using composite scintillation screens. Importantly, are be superior than flat ones nonplanar objects conformally coating, produce accurate images negligible distortion.

Language: Английский

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Polarons in Halide Perovskites: A Perspective

The Journal of Physical Chemistry Letters, Journal Year: 2020, Volume and Issue: 11(9), P. 3271 - 3286

Published: March 27, 2020

Metal halide perovskites (MHPs) have rapidly emerged as leading contenders in photovoltaic technology and other optoelectronic applications owing to their outstanding properties. After a decade of intense research, an in-depth understanding the charge carrier transport MHPs is still active topic debate. In this Perspective, we discuss current state field by summarizing most extensively studied mechanisms, such electron-phonon scattering limited dynamics, ferroelectric effects, Rashba-type band splitting, polaronic transport. We further emerging experimental computational evidence for dominant dynamics MHPs. Focusing on both small large polarons, explore fundamental aspects motion through lattice, protecting photogenerated carriers from recombination process. Finally, outline different physical chemical approaches considered recently study exploit polaron

Language: Английский

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Atomically Thin Materials for Next-Generation Rechargeable Batteries

Chemical Reviews, Journal Year: 2021, Volume and Issue: 122(1), P. 957 - 999

Published: Oct. 28, 2021

Atomically thin materials (ATMs) with thicknesses in the atomic scale (typically <5 nm) offer inherent advantages of large specific surface areas, proper crystal lattice distortion, abundant dangling bonds, and strong in-plane chemical making them ideal 2D platforms to construct high-performance electrode for rechargeable metal-ion batteries, metal-sulfur metal-air batteries. This work reviews synthesis electronic property tuning state-of-the-art ATMs, including graphene derivatives (GE/GO/rGO), graphitic carbon nitride (g-C3N4), phosphorene, covalent organic frameworks (COFs), layered transition metal dichalcogenides (TMDs), carbides, carbonitrides, nitrides (MXenes), oxides (TMOs), metal-organic (MOFs) constructing next-generation high-energy-density high-power-density batteries meet needs rapid developments portable electronics, electric vehicles, smart electricity grids. We also present our viewpoints on future challenges opportunities efficient ATMs

Language: Английский

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Halide Perovskite Materials for Photo(Electro)Chemical Applications: Dimensionality, Heterojunction, and Performance

Advanced Energy Materials, Journal Year: 2021, Volume and Issue: 12(4)

Published: May 5, 2021

Abstract In recent years, halide perovskite materials have sparked intensive research, including their burgeoning development in the field of photo(electro)chemical catalysis. Halide are based on abundant and low‐cost elements with a rich structural composition variety molecular morphological dimensionalities. They possess versatile advantages over other photo(electro)catalytic owing to facile adjustment electronic properties via compositional engineering. Thus, rapid photo(electro)catalysts past 4–5 years has opened up new opportunities for diverse applications, ranging from photocatalytic organic reactions (e.g., chemical transformations, photopolymerization, degradation) solar‐to‐chemical fuel conversion water splitting CO 2 reduction). This review aims provide an up‐to‐date discussion applications materials, emphasizing crystal dimensionality, synthetic methodologies, heterojunction structures, fundamental structure‐activity relationships. Furthermore, current challenges future research directions rational design boost overall catalytic performance stability identified envisaged respectively.

Language: Английский

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Crystal-Liquid-Glass Transition and Near-Unity Photoluminescence Quantum Yield in Low Melting Point Hybrid Metal Halides

Journal of the American Chemical Society, Journal Year: 2023, Volume and Issue: 145(22), P. 12360 - 12369

Published: May 25, 2023

Hybrid metal halides (HMHs) are a class of materials that combine extraordinary photophysical properties and excellent processability. Their chemical variability allows for the solid-liquid transition toward melt-processable HMHs. Herein, we report design synthesis zero-dimensional HMHs [M(DMSO)6][SbCl6], where isolated octahedra [M(DMSO)6]3+ [SbCl6]3- alternatively aligned in crystal structure. The luminescent center enables photogeneration self-trapped excitons, resulting broadband photoluminescence with large Stokes shift nearly 100% quantum yield. Meanwhile, release DMSO ligands from is controlled by M-O coordination thus low melting point ∼90 °C achieved Interestingly, glass phase obtained melt quenching, sharp change colors compared to robust crystal-liquid-glass opens new avenue tailoring structural disorder optoelectronic performance organic-inorganic materials.

Language: Английский

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Structurally Dimensional Engineering in Perovskite Photovoltaics

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 13(23)

Published: May 4, 2023

Abstract The low‐dimensional (LD) perovskites are proven to be capable of blocking moisture erosion and thereby improving the photovoltaic device stability. In this review, perovskite materials carefully summarized that induced by A‐position organic substituents, starting from crystal microstructure electronic structure LD (2D, 1D, 0D) with regulating dimensions, combined first principles calculation (DFT). By further studying thermodynamics dynamics crystallization nucleation growth LD–3D thin films in heterojunction region, solar cells controllable dimensions can situ prepared. Various devices systematically summarized, which shows flexible regulation energy band carrier transport characteristics, locks water oxygen corrosion channel close‐fitting conjugated structure, improves long‐term stability cells. This review is expected provide some guidance for development multipurpose use through depth understanding structurally dimensional engineering photovoltaics.

Language: Английский

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Carriers, Quasi-particles, and Collective Excitations in Halide Perovskites

Chemical Reviews, Journal Year: 2023, Volume and Issue: 123(13), P. 8154 - 8231

Published: June 5, 2023

Halide perovskites (HPs) are potential game-changing materials for a broad spectrum of optoelectronic applications ranging from photovoltaics, light-emitting devices, lasers to radiation detectors, ferroelectrics, thermoelectrics, etc. Underpinning this spectacular expansion is their fascinating photophysics involving complex interplay carrier, lattice, and quasi-particle interactions spanning several temporal orders that give rise remarkable optical electronic properties. Herein, we critically examine distill dynamical behavior, collective interactions, underlying mechanisms in conjunction with the experimental approaches. This review aims provide unified photophysical picture fundamental understanding outstanding light-harvesting properties HPs. The hotbed carrier uncovered HPs underscores critical role ultrafast spectroscopy studies advancing perovskite optoelectronics.

Language: Английский

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