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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Nanocrystal Assemblies: Current Advances and Open Problems

ACS Nano, Journal Year: 2024, Volume and Issue: 18(23), P. 14791 - 14840

Published: May 30, 2024

We explore the potential of nanocrystals (a term used equivalently to nanoparticles) as building blocks for nanomaterials, and current advances open challenges fundamental science developments applications. Nanocrystal assemblies are inherently multiscale, generation revolutionary material properties requires a precise understanding relationship between structure function, former being determined by classical effects latter often quantum effects. With an emphasis on theory computation, we discuss that hamper assembly strategies what extent nanocrystal represent thermodynamic equilibrium or kinetically trapped metastable states. also examine dynamic optimization protocols. Finally, promising functions examples their realization with assemblies.

Language: Английский

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Organic light-emitting transistors with high efficiency and narrow emission originating from intrinsic multiple-order microcavities

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

Published: March 28, 2025

Language: Английский

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Stimuli‐responsive active materials for dynamic control of light field

Deleted Journal, Journal Year: 2023, Volume and Issue: 1(2)

Published: Oct. 19, 2023

Abstract The increasing demand for the multidimensional and dynamic control of light has spurred development stimuli‐responsive, reconfigurable, programmable optical systems. Liquid crystals (LCs), which combine liquid‐like stimuli‐responsiveness crystal‐like orientational ordering, have emerged as highly appealing soft materials. Owing to their exceptional performance functionalities, they are becoming incredibly important materials in active planar optics photonics. Additionally, silk proteins, luminescent materials, metasurfaces exhibit properties, enabling remarkable multifunctional applications. This review focuses on advancements stimuli‐responsive including LCs, well some these paired with LCs. Their attractive tunable applications photonics, along great potential future systems, also emphasized.

Language: Английский

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Semiconductor Nanoplatelets Based Host‐Guest Assembly Structure with High Color Purity for Hue‐Recognizable Lateral Flow Immunoassay

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(26)

Published: Feb. 26, 2024

Abstract The hue‐recognition based point‐of‐care diagnosis favorites both human visual perception and imaging analysis with portable terminals. Semiconductor nanoplatelets (NPLs) as an emerging narrow‐emissive fluorophore particularly suit above color‐purity desired diagnosis, but are hindered by their intrinsic hydrophobicity difficulty in controlled assembly. Here the host‐guest assembling of hydrophobic NPLs developed within 3D porous space dendritic templates, stepwise surface silanization to fabricate silica‐NPLs‐silica structure (SNS). enables high fluorescence single assembly reaching 246‐fold 4‐fold brightness NPL commercial europium‐doped polystyrene bead. strategy is compatible various colored (≈540–640 nm emission) provides stable aqueous colloids well‐preserved emission. narrow emission SNS enable signal amplification visual/image color discrimination. hue‐recognizable lateral flow immunoassay for Severe Acute Respiratory Syndrome Coronavirus 2 (SARS‐CoV‐2) nucleocapsid protein reveals average naked‐eye interpretation accuracy 92.9% over six concentration levels referring standard card, accompanied a quantification linear range 0.13–200 ng mL −1 limit detection 0.13 smartphone. diagnostic results SARS‐CoV‐2 positive clinical samples demonstrate easily distinguishable antigen on hue‐gradients, which holds significance home‐based self‐testing pathogens.

Language: Английский

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Understanding Hot Injection Quantum Dot Synthesis Outcomes Using Automated High-Throughput Experiment Platforms and Machine Learning

Chemistry of Materials, Journal Year: 2024, Volume and Issue: 36(3), P. 1513 - 1525

Published: Jan. 31, 2024

Machine learning (ML) has demonstrated potential toward accelerating synthesis planning for various material systems. However, ML remained out of reach many materials scientists due to the lack systematic approaches or heuristics developing workflows synthesis. In this work, we report an approach selecting algorithms train models predicting nanomaterial outcomes. Specifically, developed and used automated batch microreactor platform collect a large experimental data set hot-injection outcomes CdSe quantum dots. Thereafter, was using algorithms. The relative performances these were compared sets different sizes with amounts noise added. Neural-network-based show most accurate predictions absorption emission peak, while cascade full width at half-maximum shown be superior direct approach. SHapley Additive exPlanations (SHAP) determine importance parameters. Our analyses indicate that SHAP scores are highly dependent on feature selection highlight inherently interpretable gaining insights from

Language: Английский

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Ligand Desorption and Fragmentation in Oleate-Capped CdSe Nanocrystals under High-Intensity Photoexcitation

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(6), P. 3732 - 3741

Published: Feb. 1, 2024

Semiconductor nanocrystals (NCs) offer prospective use as active optical elements in photovoltaics, light-emitting diodes, lasers, and photocatalysts due to their tunable absorption emission properties, high stability, scalable solution processing, well compatibility with additive manufacturing routes. Over the course of experiments, during device fabrication, or while commercially, these materials are often subjected intense prolonged electronic excitation carrier densities. The influence such conditions on ligand integrity binding remains underexplored. Here, we expose CdSe NCs laser monitor changes oleate that is covalently attached NC surface using nuclear magnetic resonance a function time intensity. Higher photon doses cause increased rates loss from particles, upward 50% total desorption measured for longest, most excitation. Surprisingly, range intensities, fragmentation detected occurs concomitantly formation aldehydes, terminal alkenes, H2, water. After illumination, size, shape, bandgap remain constant although low-energy features (Urbach tails) develop some samples, indicating substantial trap states. observed reaction chemistry, which here low chemical conversion efficiency, suggests reactivity may require examination improved dispersion stability but can also be manipulated yield desired photocatalytically accessed species.

Language: Английский

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Progress and Challenges of AIS Quantum Dots and Derivatives for Display Applications: From Synthesis to QLEDs

Journal of Luminescence, Journal Year: 2025, Volume and Issue: unknown, P. 121136 - 121136

Published: Feb. 1, 2025

Language: Английский

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Trap States in Semiconductor Quantum Dots: Friends or Foes

The Journal of Physical Chemistry C, Journal Year: 2024, Volume and Issue: 128(11), P. 4373 - 4382

Published: Feb. 12, 2024

Photophysical attributes of semiconductor quantum dots (QDs) are influenced by the presence undercoordinated ions on their surface, which generate new bands called trap states. These located within bandgap in II–VI and III–V systems; hence, photoluminescence electron transfer properties also guided depth density. Our efforts to understand these aspects summarized here taking CdSe InP QDs as examples. The increase efficiency with an core size is attributed decrease depth, allowing efficient detrapping electrons. Stacking faults, another type defect, responsible for enhanced blinking during asymmetric shell growth CdS QDs. Investigation photoinduced dynamics further establishes deep states QDs, compared shallow effective charge stabilization former.

Language: Английский

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Ligand Equilibrium Influences Photoluminescence Blinking in CsPbBr₃: A Change Point Analysis of Widefield Imaging Data

ACS Nano, Journal Year: 2024, Volume and Issue: 18(29), P. 19208 - 19219

Published: July 10, 2024

Photoluminescence intermittency remains one of the biggest challenges in realizing perovskite quantum dots (QDs) as scalable single photon emitters. We compare CsPbBr3 QDs capped with different ligands, lecithin, and a combination oleic acid oleylamine, to elucidate role surface chemistry on photoluminescence intermittency. employ widefield microscopy sample blinking behavior hundreds QDs. Using change point analysis, we achieve robust classification trajectories, analyze representative distributions from large numbers (Nlecithin = 1308, Noleic acid/oleylamine 1317). find that lecithin suppresses compared acid/oleylamine. Under common experimental conditions, lecithin-capped are 7.5 times more likely be nonblinking spend 2.5 longer their most emissive state, despite both having nearly identical solution yields. measure function dilution show differences between capping emerge at low concentrations during preparation for particle experiments. From experiment first-principles calculations, attribute performance ligand binding equilibria. Consistent our data, density functional theory calculations suggest stronger affinity QD acid/oleylamine, implying reduced likelihood desorption dilution. These results using tightly ligands is necessity passivation and, consequently, reduction used light

Language: Английский

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