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Diffusion01:12

Diffusion

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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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Diffusion01:21

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Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
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Metallic Solids02:37

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.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Structures of Solids02:22

Structures of Solids

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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 Solids02:18

Network Covalent Solids

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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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Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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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.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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Green Emitting Cerium Doped CaS Whiskers Grown by Solid State Diffusion Method.

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|July 18, 2018
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Cerium-doped Calcium sulfide (CaS) phosphors exhibit enhanced photoluminescence properties. These novel phosphors show potential for applications in optoelectronics and bioimaging.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Luminescence

Background:

  • Calcium sulfide (CaS) is a promising host material for phosphors.
  • Doping with rare-earth elements can modify optical properties.
  • Solid-state synthesis methods are common for phosphor preparation.

Purpose of the Study:

  • To synthesize and characterize undoped and cerium-doped CaS phosphors.
  • To investigate the effect of cerium doping on the structural and optical properties of CaS.
  • To explore the potential applications of these phosphors in optoelectronic devices.

Main Methods:

  • Solid-state diffusion method for synthesis.
  • X-ray diffraction (XRD) for structural analysis.
  • Scanning electron microscopy (SEM) for morphology.
  • Photoluminescence (PL) and UV-Vis absorption spectroscopy for optical characterization.

Main Results:

  • Cubic structure confirmed for both undoped and Ce-doped CaS, with crystallite sizes of 20-30 nm.
  • Ce-doped CaS phosphors exhibited whisker-like morphology.
  • PL emission showed peaks at 500 nm and 556 nm due to Ce3+ 5d→4f transitions.
  • Maximum PL intensity achieved at 3 wt.% Ce doping.
  • Optical band gap increased with cerium concentration.

Conclusions:

  • Cerium doping significantly enhances the photoluminescence properties of CaS phosphors.
  • The synthesized phosphors demonstrate potential for optoelectronic applications, including displays and bioimaging.
  • Further research can optimize doping concentrations and explore other applications.