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Related Concept Videos

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Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no regular arrangement (no fixed shape); in a gas, they are far apart with no regular arrangement (no fixed shape). Particles in a solid vibrate about fixed positions (cannot flow) and do not generally move in relation to one another; in a liquid, they move past each other (can flow) but remain in essentially constant contact; in a gas, they move...
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Solid State Multicolor Emission in Substitutional Solid Solutions of Metal-Organic Frameworks.

Wesley J Newsome1, Suliman Ayad2, Jesus Cordova1

  • 1Department of Chemistry , University of Central Florida , 4111 Libra Drive, Room 251 PSB , Orlando , Florida 32816-2366 , United States.

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|July 3, 2019
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Researchers created tunable multicolor light-emitting materials using metal-organic frameworks (MOFs). These novel MOFs incorporate multiple fluorescent molecules, enabling precise control over light emission properties for advanced applications.

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Area of Science:

  • Materials Science
  • Chemistry
  • Solid-State Physics

Background:

  • Controlling molecular packing in solid-state materials for tunable multicolor emission is challenging.
  • Metal-Organic Frameworks (MOFs) offer a promising matrix for creating substitutional solid solutions.
  • Incorporating multiple fluorophores into a single material is key for diverse emission profiles.

Purpose of the Study:

  • To develop a method for preparing organic-based substitutional solid solutions with tunable multicolor emission.
  • To utilize high-symmetry MOFs as matrices for controlled incorporation of fluorophores.
  • To achieve solution-like fluorescence properties in crystalline materials.

Main Methods:

  • Synthesized zirconia-type MOFs using a combination of nonfluorescent and red, green, and blue fluorescent links.
  • Prepared dilute mixtures of fluorescent links within the MOF matrix (around 1 mol % concentration).
  • Analyzed fluorescence properties, including spectral profiles, quantum yields, and lifetime dynamics.

Main Results:

  • Achieved bulk materials exhibiting solution-like fluorescence characteristics.
  • Observed decreased inner filtering effects at low fluorophore concentrations.
  • Demonstrated tunable chromaticity controlled solely by the initial fluorophore ratios.
  • Materials emitted multicolor and white light with high quantum yields (2-14%) and high color-rendering indices (>93).

Conclusions:

  • Successfully prepared organic-based substitutional solid solutions within MOFs with tunable emission.
  • The developed MOFs exhibit excellent properties: high quantum yields, high color-rendering indices, long shelf life, and hydrolytic stability.
  • This approach offers a robust strategy for designing advanced light-emitting materials.