Liquid crystal-templated chiral nanomaterials: from chiral plasmonics to circularly polarized luminescence

Light Science & Applications, Journal Year: 2022, Volume and Issue: 11(1)

Published: July 14, 2022

Chiral nanomaterials with intrinsic chirality or spatial asymmetry at the nanoscale are currently in limelight of both fundamental research and diverse important technological applications due to their unprecedented physicochemical characteristics such as intense light-matter interactions, enhanced circular dichroism, strong circularly polarized luminescence. Herein, we provide a comprehensive overview state-of-the-art advances liquid crystal-templated chiral nanomaterials. The chiroptical properties touched, design principles bottom-up synthesis strategies discussed. Different functional based on liquid-crystalline soft templates, including plasmonic luminescent nanomaterials, systematically introduced, underlying mechanisms, properties, potential emphasized. This review concludes perspective emerging applications, challenges, future opportunities fascinating can not only deepen our understanding fundamentals soft-matter chirality, but also shine light development advanced toward versatile optics, biology, catalysis, electronics, beyond.

Language: Английский

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Ligand Chemistry of Inorganic Lead Halide Perovskite Nanocrystals

ACS Energy Letters, Journal Year: 2023, Volume and Issue: 8(2), P. 1152 - 1191

Published: Jan. 26, 2023

Lead halide perovskite nanocrystals (LHP NCs) have emerged as next-generation semiconductor materials with outstanding optical and optoelectronic properties. Because of the high surface-to-volume ratio, performance colloidal stability LHP NCs largely depend on their surface chemistry, especially ligands termination. On one hand, capping improve luminescence; other hand highly dynamic binding nature is detrimental to photoluminescence NCs. In addition, functionalization desired molecules induces new functionalities such chirality, light harvesting, triplet sensitization through energy/electron transfer or use X-ray detectors. this review, we present current understanding an atomic view chemistry NCs, including crystal termination, vacancies, different types ligands. Furthermore, discuss ligand-induced functionalities, photocatalysis chirality.

Language: Английский

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In Situ Inorganic Ligand Replenishment Enables Bandgap Stability in Mixed‐Halide Perovskite Quantum Dot Solids

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(21)

Published: March 17, 2022

Instability in mixed-halide perovskites (MHPs) is a key issue limiting perovskite solar cells and light-emitting diodes (LEDs). One form of instability arises during the processing MHP quantum dots using an antisolvent to precipitate purify forming surface traps that lead decreased luminescence, compromised colloidal stability, emission broadening. Here, introduction inorganic ligands antisolvents used dot purification reported order overcome this problem. MHPs are colloidally stable for over 1 year at 25 °C 40% humidity demonstrated films under 100 W cm-2 photoirradiation, 4× longer than best previously MHPs, reported. In LEDs, materials enable EQE 24.4% (average 22.5 ± 1.3%) narrow (full-width half maximum 30 nm). Sixfold-enhanced operating stability relative most prior red LEDs having external efficiency >20%

Language: Английский

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Ultra‐Sensitive, Selective and Repeatable Fluorescence Sensor for Methanol Based on a Highly Emissive 0D Hybrid Lead‐Free Perovskite

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(35)

Published: June 7, 2022

A convenient and rapid detection method for methanol in ethanol remains a major challenge due to their indistinguishable physical properties. Herein, novel fluorescence probe based on perovskite was successfully designed overcome this bottleneck. We report new zero-dimensional (0D) hybrid of [MP]2 Inx Sb1-x Cl7 ⋅ 6 H2 O (MP=2-methylpiperazine) displaying an unusual green light emission with near-unity photoluminescence quantum yield. Remarkably, 0D exhibits reversible methanol-response luminescence switching between yellow color but fail any other organic vapors. Even blended alcohol solutions, the luminescent excellent sensing performance multiple superiorities response time (30 s) ultra-low limit (40 ppm), etc. Therefore, can be utilized as perfect detect traces from ultrahigh sensitivity, selectivity repeatability. To best our knowledge, work represents first wide potential environmental monitoring detection,

Language: Английский

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Recent progress in perovskite solar cells: material science

Science China Chemistry, Journal Year: 2022, Volume and Issue: 66(1), P. 10 - 64

Published: Dec. 2, 2022

Language: Английский

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Enriched‐Bromine Surface State for Stable Sky‐Blue Spectrum Perovskite QLEDs With an EQE of 14.6%

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(37)

Published: July 30, 2022

Halogen vacancies are of great concern in blue-emitting perovskite quantum-dot light-emitting diodes because they affect their efficiency and spectral shift. Here, an enriched-bromine surface state is realized using a facile strategy that employs PbBr2 stock solution for anion exchange based on Cd-doped quantum dots. It found the doped Cd ions expected to reduce formation energy halogen filled by external bromine ions, excess free enriched anchoring with as sites, accompanied shedding long-chain ligands during process, resulting Br-rich "neat" surface. Moreover, exhibits good passivation defects controlled QDs simultaneously increases exciton binding energy, leading excellent optical properties stability. Finally, sky-blue emitting (QLEDs) (490 nm) conducted record 14.6% current 19.9 cd A-1 . Meanwhile, electroluminescence spectra exhibit stability negligible shifts under constant operating voltage from 3 7 V. This paves way improving QLEDs.

Language: Английский

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Inorganic Halide Perovskite Quantum Dots: A Versatile Nanomaterial Platform for Electronic Applications

Nano-Micro Letters, Journal Year: 2022, Volume and Issue: 15(1)

Published: Dec. 29, 2022

Metal halide perovskites have generated significant attention in recent years because of their extraordinary physical properties and photovoltaic performance. Among these, inorganic perovskite quantum dots (QDs) stand out for prominent merits, such as confinement effects, high photoluminescence yield, defect-tolerant structures. Additionally, ligand engineering an all-inorganic composition lead to a robust platform ambient-stable QD devices. This review presents the state-of-the-art research progress on QDs, emphasizing electronic applications. In detail, QDs will be introduced first, followed by discussion synthesis methods growth control. Afterwards, emerging applications electronics, including transistors memories, presented. Finally, this provide outlook potential strategies advancing technologies.

Language: Английский

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Reversible Triple-Mode Switching in Photoluminescence from 0D Hybrid Antimony Halides

Chemistry of Materials, Journal Year: 2022, Volume and Issue: 34(15), P. 6985 - 6995

Published: July 19, 2022

Hybrid metal halides are an emerging class of highly efficient photoluminescent (PL) materials. However, very few them show reversible on–off PL switching under external stimuli and have the potential to perform as next-generation intelligent materials with applications in cutting-edge photoelectric devices. Herein, we report single crystal-to-single crystal (SC–SC) structural transitions among three 0D hybrid antimony halides, namely, nonemissive α-[DHEP]SbCl5 (1), yellow-emissive β-[DHEP]SbCl5·2H2O (2), red-emissive β-[DHEP]SbCl5 (3), by a dynamic phonon-engineering strategy. The SC–SC transformation between 1 2 is triggered acetone or methanol, affording switching. transition solids achieved 3 through process removal/adsorption guest water molecules. Meanwhile, performed introduction which accompanied quenching red emission. Therefore, triple-mode off–onI–onII–off realized halide hybrids for first time, including off–onI (yellow), color-tunable onI–onII (yellow-red), onII–off (red) modes. More importantly, make suitable successful protection anti-counterfeiting confidential information well optical logic gates.

Language: Английский

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Perovskite Quantum Dots in Solar Cells

Advanced Science, Journal Year: 2022, Volume and Issue: 9(7)

Published: Jan. 14, 2022

Perovskite quantum dots (PQDs) have captured a host of researchers' attention due to their unique properties, which been introduced lots optoelectronics areas, such as light-emitting diodes, lasers, photodetectors, and solar cells. Herein, the authors aim at reviewing achievements PQDs applied cells in recent years. The engineering concerning surface ligands, additives, hybrid composition for PQDSCs is outlined first, followed by analyzing reasons undesired performance PQDSCs. Subsequently, novel overview that are utilized improve photovoltaic various kinds cells, provided. Finally, this review summarized some challenges perspectives also discussed.

Language: Английский

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Colloidal Quantum Dot Solar Cells: Progressive Deposition Techniques and Future Prospects on Large‐Area Fabrication

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(17)

Published: Jan. 13, 2022

Colloidally grown nanosized semiconductors yield extremely high-quality optoelectronic materials. Many examples have pointed to near perfect photoluminescence quantum yields, allowing for technology-leading materials such as high purity color centers in display technology. Furthermore, because of chemical yield, and improved understanding the surfaces, these materials, particularly colloidal dots (QDs) can also be ideal candidates other applications. Given urgent necessity toward carbon neutrality, electricity from solar photovoltaics will play a large role power generation sector. QDs are developed shown dramatic improvements over past 15 years photoactive with various innovative deposition properties which lead exceptionally low-cost high-performance devices. Once key issues related charge transport optically thick arrays addressed, QD-based photovoltaic technology become better candidate practical application. In this article, authors show how possibilities different techniques bring cells industrial level discuss challenges perovskite QD particular, achieve large-area fabrication further advancing solve pivotal energy environmental issues.

Language: Английский

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