A5061016431- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Crystal Structures and Properties
- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Electronic and Structural Properties of Oxides
- Physics of Superconductivity and Magnetism
- Inorganic Fluorides and Related Compounds
- Catalysis and Oxidation Reactions
- ZnO doping and properties
- Catalytic Processes in Materials Science
- Inorganic Chemistry and Materials
- Copper-based nanomaterials and applications
- Solid-state spectroscopy and crystallography
- Polyoxometalates: Synthesis and Applications
- Gas Sensing Nanomaterials and Sensors
- Transition Metal Oxide Nanomaterials
- Advancements in Battery Materials
- Advancements in Solid Oxide Fuel Cells
- Ferroelectric and Piezoelectric Materials
- Crystallography and molecular interactions
- Metal-Organic Frameworks: Synthesis and Applications
- Luminescence Properties of Advanced Materials
- High-pressure geophysics and materials
- Magnetism in coordination complexes
Northwestern University
2016-2025
Argonne National Laboratory
2013-2024
University of Neuchâtel
2021
University of Aberdeen
2021
Energy Storage Systems (United States)
2019
Southeast University
2017
Northwest University
2007-2016
University of Houston
2007-2016
Division of Chemistry
1991-2016
University of Colorado Boulder
2015
Noncentrosymmetric materials are of special interest in chemistry owing to their technologically important properties, such as ferroelectricity and second-order nonlinear optical behavior. Over 500 noncentrosymmetric oxides have been compiled categorized by symmetry-dependent property crystal class. In addition, the described transition, or main group, metal coordination environment grouped element. Similarities within between groups discussed, structure−property relationships.
Nonlinear optical materials are essential for the development of solid-state lasers. KBe2BO3F2 (KBBF) is a unique nonlinear material generation deep-ultraviolet coherent light; however, its industrial application limited. Here, we report new NH4B4O6F, which exhibits wide transparent range and suitable birefringence that enables frequency doubling below 200 nm. NH4B4O6F possesses large coefficients about 2.5 times KBBF. In addition, it easy to grow bulk crystals does not contain toxic elements.
Introduction of the Cl(-) anion in borate systems generates a new perovskite-like phase, K(3)B(6)O(10)Cl, which exhibits large second harmonic response, about four times that KH(2)PO(4) (KDP), and is transparent from deep UV (180 nm) to middle-IR region. K(3)B(6)O(10)Cl crystallizes noncentrosymmetric rhombohedral space group R3m. The structure consists A-site hexaborate [B(6)O(10)] groups BX(3) Cl-centered octahedral [ClK(6)] linked together through vertices form perovskite framework...
The generation of intense coherent deep-UV light from nonlinear optical materials is crucial to applications ranging semiconductor photolithography and laser micromachining photochemical synthesis. However, few with large second harmonic (SHG) a short UV-cutoff edge are effective down 200 nm. A notable exception KBe2BO3F2, which obtained solid-state reaction highly toxic beryllium oxide powders. We designed synthesized benign polar material, Ba4B11O20F, that satisfies these requirements...
Deep ultraviolet (absorption edge <200 nm, band gap >6.2 eV) nonlinear optical (NLO) materials are of current interest owing to their technological applications and design challenges. Technologically, the used in laser systems, atto-second pulse generation, semiconductor manufacturing, photolithography. Designing synthesizing a deep UV NLO material requires crystallographic non-centrosymmetry, wide transparency range, large second-harmonic generating coefficient (dij > 0.39 pm/V), moderate...
Owing to their vital role in creating and controlling polarized light, birefringent materials are used extensively various advanced optical systems which turn impact a large, rapidly increasing range of applications science technology. Currently, the fairly small birefringence MgF2 low transmittance α-BaB2O4 (α-BBO) hinder efficient application for wavelength below 200 nm. For example, deep-ultraviolet (DUV) light polarization urgently needed DUV lithography. Here we demonstrate based on...
Our civilization relies on synthetic polymers for all aspects of modern life; yet, inefficient recycling and extremely slow environmental degradation plastics are causing increasing concern about their widespread use. After a single use, many these materials currently treated as waste, underutilizing inherent chemical energy value. In this study, energy-rich polyethylene (PE) macromolecules catalytically transformed into value-added products by hydrogenolysis using well-dispersed Pt...
LiCs2PO4, a new deep-ultraviolet (UV) transparent material, was synthesized by the flux method. The material contains unusual edge-sharing LiO4-PO4 tetrahedra. It exhibits very short absorption edge of λ = 174 nm and generates largest powder second harmonic generation (SHG) response for deep-UV phosphates that do not contain additional anionic groups, i.e., 2.6 times KH2PO4 (KDP). First-principles electronic structure analyses confirm experimental results suggest strong SHG may originate...
ConspectusAdaptable crystalline frameworks are important in modern solid-state chemistry as they able to accommodate a wide range of elements, oxidation states, and stoichiometries. Owing this ability, such adaptable framework structures emerging the prototypes for technologically advanced functional materials. In Account, idea cosubstitution is explored useful "pairing" concept that can potentially lead creation many new members one particular structure. Cosubstitution practiced...
Nonlinear optical (NLO) crystals are essential materials for generation of coherent UV light in solid state lasers. KBBF is the only material that can achieve below 200 nm by direct second harmonic (SHG). However, its strong layer habits and high toxicity beryllium oxide powders required synthesis limit application. By substituting Be with Zn connecting adjacent [Zn2BO3O2]∞ layers B3O6 groups, a new nonlinear material, Cs3Zn6B9O21, was synthesized. It overcomes processing limitations...
The union of structural and spectroscopic modeling can accelerate the discovery improvement phosphor materials if guided by an appropriate principle. Herein, we describe concept "chemical unit cosubstitution" as one such potential design scheme. We corroborate this strategy experimentally computationally applying it to Ca2(Al(1-x)Mg(x))(Al(1-x)Si(1+x))O7:Eu(2+) solid solution phosphor. cosubstitution is shown be restricted tetrahedral sites, which enables tuning luminescent properties....
Pb(II) has long been associated with lone pair activity and is often substituted in alkali earth metal borates to create new nonlinear optical (NLO) materials enhanced second harmonic generation (SHG) capabilities. However, large enhancement isomorphic Pb-free analogues rare. Here we report a NLO material Pb2Ba3(BO3)3Cl phase-matching SHG response approximately 3.2× that of KDP 6× higher than its compound Ba5(BO3)3Cl. We show the originates from unique edge-sharing connection between...
Nichtlineare Optik: Ein neues Bor-reiches Borsilicat, Cs2B4SiO9, wurde synthetisiert (siehe Bild). Die Verbindung zeigt eine 4.6-fach stärkere Frequenzverdopplung im Vergleich zu KH2PO4 und zeichnet sich durch schmale UV-Absorptionskante aus (unterhalb von 190 nm).
Mid-IR nonlinear optical (NLO) materials are of great importance in modern laser frequency conversion technology and parametric oscillator processes. However, the commercially available IR NLO crystals (e.g., AgGaQ2 (Q = S, Se) ZnGeP2) suffer from two obstacles, low damage thresholds (LDTs) difficulty obtaining high-quality crystals, both which seriously hinder their applications. The introduction Cl, an element with a large electronegativity, Pb, relatively heavy to promote properties,...
A codoping strategy is advanced to improve luminescence efficiency, emission color tuning, and thermal stability of LED phosphors.
Polar materials are of great technical interest but challenging to effectively synthesize. That is especially true for iodates, an important class visible and mid-IR transparent nonlinear optical (NLO) materials. Aiming at developing a new design strategy polar we successfully synthesized two sets polymorphic early transition-metal (ETM) oxide-fluoride α- β-Ba[VFO2(IO3)2] β-Ba2[VO2F2(IO3)2]IO3, based on the distinct structure-directing properties anions. contain trans-[VFO2(IO3)2]2-...