A5081236393- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- Hydrogels: synthesis, properties, applications
- Solid-state spectroscopy and crystallography
- Optical properties and cooling technologies in crystalline materials
- 2D Materials and Applications
- Nanocluster Synthesis and Applications
- Advanced biosensing and bioanalysis techniques
- Optical Imaging and Spectroscopy Techniques
- Advanced Materials and Mechanics
- Carbon and Quantum Dots Applications
- Liquid Crystal Research Advancements
- Thermal Expansion and Ionic Conductivity
- Polymer Surface Interaction Studies
- Micro and Nano Robotics
- Advanced Polymer Synthesis and Characterization
- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced Photocatalysis Techniques
- Photonic Crystals and Applications
- Advanced Nanomaterials in Catalysis
- Pickering emulsions and particle stabilization
- Supramolecular Self-Assembly in Materials
- Organic Light-Emitting Diodes Research
- Sulfur-Based Synthesis Techniques
- Surfactants and Colloidal Systems
Northwestern University
2023-2025
Brown University
2018-2024
John Brown University
2020-2021
ORCID
2021
Providence College
2020
University of Electronic Science and Technology of China
2020
University of North Texas
2004-2019
Peking University
2018
State Key Laboratory of Rare Earth Materials Chemistry and Application
2018
Beijing National Laboratory for Molecular Sciences
2018
Compared with the n-i-p structure, inverted (p-i-n) perovskite solar cells (PSCs) promise increased operating stability, but these photovoltaic often exhibit lower power conversion efficiencies (PCEs) because of nonradiative recombination losses, particularly at perovskite/C60 interface. We passivated surface defects and enabled reflection minority carriers from interface into bulk using two types functional molecules. used sulfur-modified methylthio molecules to passivate suppress through...
Lead-free double perovskite nanocrystals (NCs) have emerged as a new category of materials that hold the potential for overcoming instability and toxicity issues lead-based counterparts. Doping chemistry represents unique avenue toward tuning optimizing intrinsic optical electronic properties semiconductor materials. In this study, we report first example doping Yb3+ ions into lead-free Cs2AgBiX6 (X = Cl-, Br-) NCs via hot injection method. The endows with newly near-infrared emission band...
Morphology control represents an important strategy for the development of functional nanomaterials and has yet to be achieved in case promising lead-free double perovskite materials so far. In this work, high-quality Cs2AgBiX6 (X = Cl, Br, I) two-dimensional nanoplatelets were synthesized through a newly developed synthetic procedure. By analyzing optical, morphological, structural evolutions samples during synthesis, we elucidated that growth mechanism followed lateral process from...
Concerns about the toxicity of lead-based perovskites have aroused great interest for development alternative lead-free perovskite-type materials. Recently, theoretical calculations predict that Pb2+ cations can be substituted by a combination Cu2+ and Sb3+ to form vacancy-ordered layered double perovskite structure with superior optoelectronic properties. However, accessibilities this class materials remain inadequate, hindering their practical implementations in various applications. Here,...
Abstract Doping metal ions into lead halide perovskite nanocrystals (NCs) has attracted great attention over the past few years due to emergence of novel properties relevant optoelectronic applications. Here, synthesis Mn 2+ /Yb 3+ codoped CsPbCl 3 NCs through a hot‐injection technique is reported. The resulting show unique triple‐wavelength emission covering ultraviolet/blue, visible, and near‐infrared regions. By optimizing dopant concentrations, total photoluminescence quantum yield (PL...
Developing Type-I core/shell quantum dots is of great importance toward fabricating stable and sustainable photocatalysts. However, the application systems has been limited due to strongly confined photogenerated charges by energy barrier originating from wide-bandgap shell material. In this project, we found that through decoration Au satellite-type domains on surface CdS/ZnS dots, such an can be effectively overcome over 400-fold enhancement photocatalytic H2 evolution rate was achieved...
The introduction of lanthanide ions (Ln3+) into all-inorganic lead-free halide perovskites has captured significant attention in optoelectronic applications. However, doping Ln3+ heterometallic layered double perovskite (LDP) nanocrystals (NCs) and their associated mechanisms remain unexplored. Herein, we report the first colloidal synthesis (Yb3+, Er3+)-doped LDP NCs utilizing a modified hot-injection method. resulting exhibit efficient near-infrared (NIR) photoluminescence both NIR-I...
Microgels with photo-, thermally, and pH-responsive properties in aqueous suspension have been synthesized characterized using dynamic light scattering UV−visible spectroscopy. The new route involved first preparing poly(N-isopropylacrylamide) (PNIPAM)−allylamine copolymer microgels a spiropyran photochrome (SP) bearing carboxylic acid group. Then the functionalized was coupled to microgel via an amide bond. dark-equilibrated gel particles feature molecules polar, merocyanine form. After...
Since Lutz's and coworkers 2006 J. Am. Chem. Soc. paper on thermoresponsive properties of poly-oligo(ethylene glycol) methacrylates (POEGMA), the publications these polymers have grown rapidly. This highlight will cover some latest progresses in this active field. The selected topics include synthesizing POEGMA with various structures via controlled free radical polymerization techniques, coating flat particle surfaces to impart thermo-responsive antifouling materials, preparing...
Cesium lead halide (CsPbX3 ) perovskite has emerged as a promising low-threshold multicolor laser material; however, realizing wavelength-tunable lasing output from single CsPbX3 nanostructure is still constrained by integrating different composition. Here, the direct synthesis of composition-graded CsPbBrx I3-x nanowires (NWs) reported through vapor-phase epitaxial growth on mica. The graded composition along NW, with an increased Br/I center to ends, comes desynchronized deposition cesium...
While various effects of physicochemical parameters (e.g., size, facet, composition, and internal structure) on the catalytic efficiency nanozymes (i.e., nanoscale enzyme mimics) have been studied, strain effect has never reported understood before. Herein, we demonstrate in by using Pd octahedra icosahedra with peroxidase-like activities as a model system. Strained were found to display 2-fold higher than unstrained octahedra. Theoretical analysis suggests that tensile is more beneficial OH...
Doped lead halide perovskite nanocrystals (NCs) have garnered significant attention due to their superior optoelectronic properties. Here, we report a synthesis of Cd-doped CsPbCl3 NCs by decoupling Pb- and Cl-precursors in hot injection method. The resulting manifest dual-wavelength emission profile with the first reported example Cd-dopant emission. By controlling concentration, can be tuned dopant quantum yield up 8%. A new secondary (∼610 nm) is induced an energy transfer process from...
Semiconductor quantum dots (QDs) have attracted tremendous attention in the field of photocatalysis, owing to their superior optoelectronic properties for photocatalytic reactions, including high absorption coefficients and long photogenerated carrier lifetimes. Herein, by choosing 2-(3,4-dimethoxyphenyl)-3-oxobutanenitrile as a model substrate, we demonstrate that stereoselective (>99 %) C-C oxidative coupling reaction can be realized with product yield (99 using zwitterionic ligand capped...
Formamidinium lead halide (FAPbX3, X = Cl, Br, I) perovskite materials have recently drawn an increased amount of attention owing to their superior optoelectronic properties and enhanced material stability as compared with methylammonium-based (MA-based) analogues. Herein, we report a study the pressure-induced structural optical evolutions FAPbI3 hybrid organic–inorganic nanocrystals (NCs) using synchrotron-based X-ray scattering technique coupled in situ absorption photoluminescence...
Lead-free double perovskites have emerged as a promising class of materials with potential to be integrated into wide range optical and optoelectronic applications. Herein, the first synthesis 2D Cs2 AgInx Bi1- x Cl6 (0 ≤ 1) alloyed perovskite nanoplatelets (NPLs) well controlled morphology composition is demonstrated. The obtained NPLs show unique properties highest photoluminescence quantum yield 40.1%. Both temperature dependent spectroscopic studies density functional theory calculation...
Halide perovskites are used to fabricate energy-efficient optoelectronic devices. Determining which compositions yield desired chromatic responses is challenging, especially when doping strategies used. Here, we report a way of mapping the compositional space halide generate light emission or “chromaticity” palette. Megalibraries consisting millions Mn 2+ -doped PEA 2 PbX 4 (PEA: phenethylammonium, X: anions) perovskite nanocrystals were synthesized screen that led specific profiles. The...
Monodisperse microgels of P(MEO2MA-co-OEGMA) have been synthesized by using free radical polymerization. Microgels with a variety particle radii ranging from 82 to 412 nm obtained different surfactant concentrations. The size distribution is extremely narrow and even better than that for PNIPAM microgels. Pure MEO2MA an LCST about 22 °C. LCSTs corresponding the molar ratio OEGMA at 10 20% are 31 37 °C, respectively. in water self-assemble into various phases, including crystalline phase...
Abstract Deciphering the complicated excited-state process is critical for development of luminescent materials with controllable emissions in different applications. Here we report emergence a photo-induced structural distortion accompanied by an electron redistribution series gold nanoclusters. Such unexpected slow transformation results near-infrared dual emission extended photoluminescent lifetime. We demonstrate that this exhibits highly sensitive and ratiometric response to solvent...
Lead-halide perovskites have attracted much attention over the past decade, while two main issues, i.e., lead-induced toxicity and materials’ instability, limit their further practice in widespread applications. To overcome these limitations, an effective alternative is to design lead-free perovskite materials with substitution of divalent lead ions a pair monovalent trivalent metal ions. However, fundamental physics chemistry about how tuning material’s composition affects crystal phase,...
Manganese-doped cesium lead chloride (CsPbCl3) perovskite nanocrystals (NCs) have recently garnered attention because of their unique magneto-optical properties, giving them potential in a variety optoelectronic applications. One common method to dope Mn2+ into host CsPbCl3 NCs is through postsynthetic ion exchange reaction. However, most strategies utilize Mn2+-containing precursor solution, which adds limitations the reaction due compatibility and stability issues. Here, we report new...
We present semipermeable, hollow capsules (colloidosomes) that expand and contract upon heating cooling. The are composed of micrometer-sized poly(N-isopropylacrylamide)-co-acrylic acid microgel particles, which exhibit a reversible size transition near 34 degrees C. particles assemble on the surfaces water droplets in oil. Addition diblock copolymer poly(butadiene-b-N-methyl 4-vinyl pyridinium iodide) to oil results soft, elastic membranes remain intact after droplet interfaces dissolved....
Poly(N-isopropylacrylamide) (PNIPAM) hydrogel nanospheres response to global temperature stimuli across the low critical solution is studied as water content in polymer network modified. The refractive index of gel nanoparticles was measured a function using spectroscopic ellipsometry. volume reduces by 40% resulting modification light scattering properties medium. A change from 33 34 °C results contraction which accompanied 8–10% enhancement network.
Space-based solar power harvesting systems with high levels of specific (the produced per mass the mounted photovoltaic cell) are highly desired. In this study, we synthesized quality lead-free Cs3Cu2Cl5 perovskite nanodisks efficient ultraviolet (UV) photon absorption, photoluminescence quantum yields, and a large Stokes shift, which suitable to serve as energy downshifting emitters in applications photon-managing devices especially for space harvesting. To demonstrate possibility, have...