A5068342859- Luminescence Properties of Advanced Materials
- Perovskite Materials and Applications
- Inorganic Fluorides and Related Compounds
- Quantum Dots Synthesis And Properties
- Solid-state spectroscopy and crystallography
- Atomic and Subatomic Physics Research
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Radiation Detection and Scintillator Technologies
- Advanced ceramic materials synthesis
- ZnO doping and properties
- Iron oxide chemistry and applications
- Ferroelectric and Piezoelectric Materials
- Advancements in Battery Materials
- Nuclear materials and radiation effects
- Crystal Structures and Properties
- Copper-based nanomaterials and applications
- Gas Sensing Nanomaterials and Sensors
- Advanced Battery Materials and Technologies
- Phase-change materials and chalcogenides
- Atmospheric Ozone and Climate
- Atmospheric chemistry and aerosols
- Supercapacitor Materials and Fabrication
- Layered Double Hydroxides Synthesis and Applications
- Glass properties and applications
Beijing University of Technology
2013-2024
Beijing National Laboratory for Molecular Sciences
2006-2010
Peking University
2002-2010
University of Hong Kong
2002-2010
State Key Laboratory of Rare Earth Materials Chemistry and Application
2002-2010
East China Normal University
2008
We report a general synthesis of high-quality cubic (α-phase) and hexagonal (β-phase) NaREF4 (RE: Pr to Lu, Y) nanocrystals (nanopolyhedra, nanorods, nanoplates, nanospheres) NaYF4:Yb,Er/Tm (nanopolyhedra nanoplates) via the co-thermolysis Na(CF3COO) RE(CF3COO)3 in oleic acid/oleylamine/1-octadecene. By tuning ratio Na/RE, solvent composition, reaction temperature time, we can manipulate phase, shape, size nanocrystals. On basis its α → β phase transition behavior, along rare-earth series,...
Phosphate ions play a crucial role not only for the formation of spindlelike precursors single-crystalline hematite nanotubes that were synthesized by facile hydrothermal method. They are also important adsorption and coordination effects. The mechanism tube was deduced through EM observations as coordination-assisted dissolution process (see picture). Supporting information this article is available on WWW under http://www.wiley-vch.de/contents/jc_2002/2005/z463038_s.pdf or from author....
We present an innovative approach to the production of single-crystal iron oxide nanorings employing a solution-based route. Single-crystal hematite (alpha-Fe2O3) were synthesized using double anion-assisted hydrothermal method (involving phosphate and sulfate ions), which can be divided into two stages: (1) formation capsule-shaped alpha-Fe2O3 nanoparticles (2) preferential dissolution along long dimension elongated (the c axis alpha-Fe2O3) form nanorings. The shape is mainly regulated by...
Abstract Recently, there are significant progresses in the growth of organic-inorganic lead halide perovskite single crystals, however, due to their susceptible nucleation and mechanisms solvent requirements, efficient generalized for these crystals is still challenging. Here we report work towards this target with a polymer-controlled process highly large-size high-quality simple ternary, mixed-cations mixed-halide crystals. Among them, carrier lifetime FAPbBr 3 largely improved 10199 ns....
SnO2 nanorod arrays were hierarchically assembled onto the surface of alpha-Fe2O3 nanotubes via a facile solution method. Determined by hexagonal geometrical nature nanotubes, heterostructures 6-fold symmetry. HRTEM characterizations demonstrated that lattice mismatch at interface was an important factor in determining growth direction secondary arrays.
Abstract We report the first systematic synthesis of monodisperse rare‐earth (RE=La to Lu, Y) fluoride and oxyfluoride nanocrystals with diverse shapes (trigonal REF 3 triangular, truncated‐triangular, hexagonal, polygonal nanoplates; orthorhombic quadrilateral zigzag‐shaped cubic REOF nanopolyhedra nanorods) from single‐source precursors (SSP) [RE(CF COO) ] through controlled fluorination in oleic acid (OA)/oleylamine (OM)/1‐octadecene (ODE). To selectively obtain or nanocrystals, REO bond...
We report a Mn2+-activated all-inorganic 2D layered Ruddlesden–Popper (RP) perovskite Cs2CdCl4 single crystal as highly efficient and stable X-ray scintillator. The Cs2CdCl4:10% Mn achieves bright orange-red emission with photoluminescence quantum yield up to 90.47%, good environmental stability, decent thermal quenching resistance. As scintillator, shows strong absorption, ultrahigh light 88138 photons/MeV, low detection limit of 31.04 nGyair/s. A 15 × cm flexible scintillation screen is...
Abstract Portable X‐ray imaging technology plays a crucial role in enabling prompt diagnosis and treatment outdoors. Nevertheless, the persistent challenge of external optical signal crosstalk poses significant bottleneck to its advancement. Herein, solution utilizing near‐infrared (NIR) light effectively mitigate is proposed, thereby demonstrating feasibility portable even under ambient light. A series rare earth ions doped Cs 2 Ag x Na 1‐x In y Bi 1‐y Cl 6 halide scintillators reported,...
Abstract This review discusses the utilization of metal halide perovskite (MHP) materials in X‐ray direct imaging detectors for medical application. Compared to traditional semiconductors, MHP has multiple advantages including high linear attenuation coefficient, low exciton binding energy, long carrier diffusion length, and mobility. These ascendancies allow low‐dose high‐resolution imaging. Apartment from a historical overview develop‐X‐ray their performance indicators, this specifically...
Monodisperse sub-2-nm EuOF nanowires were obtained by manipulating the fluorophilicity between crystalline seeds and capping surfactant molecules during thermolysis of Eu(CF3COO)3 in oleic acid (OA) oleylamine (OM). The uniform can self-organize on substrates to form parallel aligned superstructures display strong Eu3+red emissions with high quantum yields 65% under UV light excitations due presence dense surface Eu3+ sites ultrathin as well passivation defects ligands.
Phosphat-Ionen sind wesentlich: Dies gilt nicht nur für die Bildung der spindelförmigen Vorstufen einkristallinen Hämatitnanoröhren, mit einer einfachen Hydrothermalmethode hergestellt wurden, sondern auch Adsorptions- und Koordinationseffekte. Der Mechanismus Röhrenbildung wurde aus Elektronenmikroskopie-Beobachtungen abgeleitet – als ein koordinationsgestützter Auflösungsprozess (siehe Bild). Supporting information for this article is available on the WWW under...
Abstract Monocrystalline LnPO 4 (Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb) nanowires have been prepared in bulk quantities by a simple, facile, and clean solution‐based hydrothermal method at 220−240 °C finely tuning the acidity of stock solutions. The length width were range 1−10 μm 10−200 nm, respectively. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)
Uniform alkaline earth metal fluoride MF2 (M = Mg, Ca, and Sr) nanocrystals with various shapes (tetragonal MgF2 nanoneedle-constructed 3D networks; cubic CaF2 nanoplates nanopolyhedra; SrF2 nanowires) have been synthesized from the thermolysis of trifluoroacetate (M(CF3COO)2) in hot surfactant solutions (oleic acid, oleylamine, 1-octadecene). The were formed by controlled fluorination M−O bond into M−F at nucleation stage subsequent growth process. For phase-pure nanocrystals,...
In this work, ZnO hierarchical architectures are successfully fabricated by concentration-controlled heterogeneous nucleation behavior through a one-pot solution method, free of organic structure-directing agents or pretreated substrates. A two-stage nucleation-growth process should account for the assembly process. First, flowerlike plate aggregates formed with fast kinetics. Then, these served as substrates to induce secondary nucleations under appropriate supersaturation degree....
Two 2D Mn (II) complexes, [Mn3(TzDC)2(phen)3] x 2 H2O (1; H3TzDC = 1,2,3-triazole-4,5-dicarboxylic acid, phen 1,10-phenanthroline) and [Mn3(TzDC)2(bipy)3] 4 (2; bipy 2,2'-bipyridine), were synthesized by hydrothermal reactions characterized magnetically, complex 1 was the first example of chiral with a Kagomé lattice connectivity obtained through spontaneous resolution.
Using electron microscopy and diffraction techniques, as well first-principles calculations, we demonstrate that much 35% of the total Ge atoms in cubic phase Ge2Sb2Te5 locate tetrahedral environments. The Ge-vacancy interactions play a crucial stabilizing role, leading to pairs sharing vacancies clusters into domains. structure with coexisting octahedral produces optical structural properties good agreement experimental data explains property contrast rapid transformation this phase-change alloy.
Organic–inorganic halide perovskites (OIHPs) have the typical composition of APbX3, in which A is a cation such as methlyamine (MA) and formamidine (FA) X anion Cl, Br, or I. The mixture at site OIHPs provides greatly improved versatility their compositions therefore allows enhancement performance LEDs solar cells. In real application circumstances deformable devices, mechanical properties are great importance. this work, three series mixed OIHP single crystals, MAPbIxBr3−x, MAPbBrxCl3−x,...
Doping lanthanide ions into the Cs 4 MnBi 2 Cl 12 double perovskite results in multimodal luminescence, and unique Bi–Mn–Bi sandwich structure facilitates energy transfer between transition metal ions.
A highly efficient zinc halide scintillator is developed through a compositional engineering strategy.
Abstract Pure monoclinic‐ (m) and tetragonal (t) LaVO 4 :Eu nanocrystals were prepared by a facile citric anion‐ EDTA (ethylenediaminetetraacetic acid)‐assisted hydrothermal method, respectively. The structure is characterized XRD, Raman spectroscopy, electron microscopy. Besides characterization, site‐selective emission spectroscopy was used to investigate the relationship between microstructure luminescent characters of m‐ t‐LaVO nanocrystals. results show that for both nanocrystals, Eu 3+...
Low-dimensional hybrid halide perovskite materials with self-trapped exciton (STE) emissions and anisotropic properties are highly attractive for their great potential in many applications. However, to date, reports on large one-dimensional (1D) single crystals have been limited. Here, centimeter-sized 1D of trimethylammonium lead iodide (TMAPbI3) typical STE emission synthesized by an antisolvent vapor-assisted crystallization method. Thermal quenching antiquenching a high relative...