A5035721459- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Perovskite Materials and Applications
- ZnO doping and properties
- Gas Sensing Nanomaterials and Sensors
- Ferroelectric and Piezoelectric Materials
- 2D Materials and Applications
- Electrical and Thermal Properties of Materials
- Nanocluster Synthesis and Applications
- Molecular Junctions and Nanostructures
- Graphene research and applications
- Transition Metal Oxide Nanomaterials
- Copper-based nanomaterials and applications
- Nanowire Synthesis and Applications
- Radiation Detection and Scintillator Technologies
- Quantum and electron transport phenomena
- Ga2O3 and related materials
- Advanced Photocatalysis Techniques
- Luminescence and Fluorescent Materials
- Microwave Dielectric Ceramics Synthesis
- Luminescence Properties of Advanced Materials
- Photocathodes and Microchannel Plates
- Solid-state spectroscopy and crystallography
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
Huazhong University of Science and Technology
2015-2024
Wuhan National Laboratory for Optoelectronics
2010-2024
Hunan University
2021
University of Maryland, College Park
2018-2019
Park University
2018
Radioluminescent materials (scintillators) are widely applied in medical imaging, nondestructive testing, security inspection, nuclear and radiation industries, scientific research. Recently, all-inorganic lead halide perovskite nanocrystal (NC) scintillators have attracted great attention due to their facile solution processability ultrasensitive X-ray detection, which allows for large area flexible imaging. However, the light yield of these NCs is relatively low because strong...
Self-trapped excitons (STEs) in metal halide materials are attracting an increasing level of interest due to their unique light emission properties. Light from STEs halides is usually associated with excited-state structural deformation, which lowers the symmetry local structures, as seen for a wide range systems. Here, we reveal prototypic STE-associated "distortion" that, however, enhances series all-inorganic copper(I)-based Cs3Cu2X5 (X = Cl, Br, or I). We further find that peaks...
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...
Abstract Graphene nanoribbons (GNRs) are ultra-narrow strips of graphene that have the potential to be used in high-performance graphene-based semiconductor electronics. However, controlled growth GNRs on dielectric substrates remains a challenge. Here, we report successful directly hexagonal boron nitride with smooth edges and controllable widths using chemical vapour deposition. The approach is based type template allows for in-plane epitaxy mono-layered nano-trenches following zigzag...
Abstract Infrared solar cells that utilize low‐bandgap colloidal quantum dots (QDs) are promising devices to enhance the utilization of energy by expanding harvested photons common photovoltaics into infrared region. However, present synthesis PbS QDs cannot produce highly efficient cells. Here, a general is developed for (0.65–1 eV) via cation exchange from ZnS nanorods (NRs). First, NRs converted superlattices with segregated domains within each rod. Then, sulfur precursors released...
Broad-band white-light emissions from organic–inorganic lead halide hybrids have attracted considerable attention in energy-saving solid-state lighting (SSL) applications. However, the toxicity of these hinders their commercial prospects, and low photoluminescence quantum yields (PLQYs) cannot meet requirements for efficient lighting. Here, we report a highly dual-band emission organic copper iodide, (C16H36N)CuI2, which exhibits high PLQY 54.3% excellent air stability. The...
Abstract Trap states in colloidal quantum dot (QD) solids significantly affect the performance of QD solar cells, because they limit open‐circuit voltage and short circuit current. The {100} facets PbS QDs are important origins trap due to their weak or missing passivation. However, previous investigations focused on synthesis, ligand exchange, passivation approaches ignored control for a given size. Herein, suppressed from source via facet QDs. ≈3 nm minimized by tuning balance between...
Atomically thin hexagonal boron nitride (h-BN) is often regarded as an elastic film that impermeable to gases. The high stabilities in thermal and chemical properties allow h-BN serve a gas barrier under extreme conditions. Here, we demonstrate the isolation of hydrogen bubbles via plasma treatment. Detailed characterizations reveal substrates do not show change after are found withstand treatment air, even at 800 °C. Scanning transmission electron microscopy investigation shows multilayer...
Zero-dimensional (0D) copper-based metal halides have exhibited great potential as luminescent materials with structural tunability and impressive emission properties. Luminescence from highly ordered self-assembly of copper is typically characterized by high photoluminescence quantum efficiencies (PLQEs) large Stokes shifts, which are the most attractive features for active optical waveguides. Here, we report a novel organic halide, (PTMA)3Cu3I6 (PTMA: phenyltrimethylammonium), in...
All inorganic Cs<sub>3</sub>Bi<sub>2</sub>Br<sub>9</sub> perovskite NCs were synthesized at room temperature, demonstrating blue dual-emission peaks and high photoluminescence quantum yield.
Zero-dimensional (0D) organic metal halides have attracted significant attention because of their exceptional structure tunability and excellent optical characteristics. However, controllable synthesis a desirable configuration halide species in rational way remains formidable challenge, how the unique crystal structures affect photophysical properties are not yet well understood. Here, reasonable structural modulation strategy is proposed to realize near-unity photoluminescence quantum...
Infrared (IR) solar cells are promising devices for significantly improving the power conversion efficiency of common by harvesting low-energy IR photons. PbSe quantum dots (QDs) superior photon absorbing materials due to their strong confinement and thus interdot electronic coupling. However, high chemical activity QDs leads etching poor passivation in ligand exchange, resulting a trap-state density open circuit voltage (VOC) deficit. Here we develop hybrid co-passivation strategy...
A new strategy for narrowing the size distribution of colloidal quantum dots (QDs) was developed by combining cation exchange and quantized Ostwald ripening. Medium-sized reactant CdS(e) QDs were subjected to form target PbS(e) QDs, then small added which converted via exchange. The small-sized ensemble dissolved completely rapidly released a large amount monomers, promoting growth size-focusing medium-sized QDs. addition can be repeated continuously reduce distribution. method applied...
Strongly quantum confined ZnS dots were synthesized and solar-blind deep ultraviolet photodetectors fabricated <italic>via</italic> a solution process.
Lead halide two-dimensional (2D) nanoplatelets (NPLs) have attracted intense interest due to their unique optoelectronic properties.
Hydrophilic CuInS<sub>2</sub> and CuInS<sub>2</sub>–ZnS colloidal quantum dots were directly synthesized using <italic>in situ</italic> generated H<sub>2</sub>S as the sulphur source DMF solvent. Short chain thiols applied capping ligands, reactivity controlling agents sources for growth of ZnS shell.
Abstract Lead chalcogenide quantum dot (QD) infrared (IR) solar cells are promising devices for breaking through the theoretical efficiency limit of single‐junction by harvesting low‐energy IR photons that cannot be utilized common devices. However, device performance QD photovoltaic is limited restrictive relation between open‐circuit voltages ( V OC ) and short circuit current densities J SC ), caused contradiction surface passivation electronic coupling solids. Here, a strategy developed...
Abstract Lead‐free halide double perovskite Cs 2 AgInCl 6 has attracted great attention due to its highly efficient luminescence and excellent stability. However, the parity forbidden electronic transition limits further applications in lighting display fields. In this work, nanocrystals (NCs) are synthesized by injecting trimethyl chlorosilane into dissolved precursors at 180 °C as‐synthesized NCs exhibit a weak orange emission peak 570 nm with photoluminescence quantum yield (PLQY) of...
Abstract Broadband white‐light emissions from low‐dimensional organic metal halides have received great attention for applications in energy‐efficient lighting and displays. However, the simultaneous realization of excellent color rendering indexes (CRIs) high photoluminescence quantum efficiencies (PLQEs) single‐component emitters remains a challenge. Here, unique 0D copper iodide (TPA)CuI 2 (TPA = tetrapropylammonium) is developed, which edge‐sharing double trigonal planar [Cu I 4 ] 2−...
Zero-dimensional (0D) metal halides have attracted great research interest for the past few years due to their fascinating photophysical properties and extraordinary structural diversity. However, controlled synthesis of these in a rational way remains big challenge, basic relationship between crystal structures is still not well understood. In this work, two new 0D self-assemblies isomeric copper iodide trimers with same formula (BTMA)3Cu3I6 (BTMA = benzyltrimethylammonium) but different...