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Related Concept Videos

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Emission Spectra

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When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
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The range is one of the measures of variation. It can be defined as the difference between a dataset's highest and lowest values. For example, in the study of seven 16-ounce soda cans, the filled volume of soda was measured, thus producing the following amount (in ounces) of soda:
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Free Energy and Equilibrium

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The free energy change for a process may be viewed as a measure of its driving force. A negative value for ΔG represents a driving force for the process in the forward direction, while a positive value represents a driving force for the process in the reverse direction. When ΔGrxn is zero, the forward and reverse driving forces are equal, and the process occurs in both directions at the same rate (the system is at equilibrium).
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The universe is composed of matter in different forms, and all forms of matter contain energy.  The different forms of energy on Earth originate from the Sun — the ultimate energy source. Plants capture light energy from the Sun, and, via the process of photosynthesis, convert it into chemical energy. This stored energy from plants can be harnessed in many ways. For example, eating plant products as food provides energy for our body to function, and burning wood or coal (fossilized...
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Free Energy01:21

Free Energy

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Free energy—abbreviated as G for the scientist Gibbs who discovered it—is a measurement of useful energy that can be extracted from a reaction to do work. It is the energy in a chemical reaction that is available after entropy is accounted for. Reactions that take in energy are considered endergonic and reactions that release energy are exergonic. Plants carry out endergonic reactions by taking in sunlight and carbon dioxide to produce glucose and oxygen. Animals, in turn, break...
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Synthesis of Cd-free InP/ZnS Quantum Dots Suitable for Biomedical Applications
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Polychromatic emission in a wide energy range from InP-InAs-InP multi-shell nanowires.

S Battiato1, S Wu2, V Zannier1

  • 1NEST, Scuola Normale Superiore and Istituto Nanoscienze-CNR, I-56217 Pisa, Italy.

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|January 12, 2019
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Summary
This summary is machine-generated.

Indium phosphide-indium arsenide-indium phosphide multi-shell nanowires exhibit distinct photoluminescence properties. These nano-heterostructures offer potential for polychromatic optical components in quantum information devices.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Quantum Optics

Background:

  • Indium phosphide-indium arsenide-indium phosphide (InP-InAs-InP) multi-shell nanowires (NWs) are advanced semiconductor nanostructures.
  • Understanding their optical properties is crucial for developing novel optoelectronic devices.

Purpose of the Study:

  • Investigate the low-temperature photoluminescence (PL) properties of InP-InAs-InP multi-shell NWs.
  • Characterize emissions across a wide energy range (0.7–1.6 eV).
  • Identify distinct emitting domains within the nano-heterostructures.

Main Methods:

  • Growth of InP-InAs-InP multi-shell NWs in wurtzite (WZ) or zincblende (ZB) crystal phases.
  • Low-temperature (≈6 K) photoluminescence spectroscopy.
  • Analysis of PL spectra across different measurement geometries.

Main Results:

  • Observed PL emissions attributed to four distinct domains: InAs island, InAs capping shell, crystal-phase quantum disks, and InP segments.
  • Emissions analyzed in the energy range of 0.7–1.6 eV.
  • Correlation between NW structure (WZ/ZB phases) and optical emission characteristics.

Conclusions:

  • The study elucidates the origin of diverse optical emissions in InP-InAs-InP multi-shell NWs.
  • These NWs, with their multiple quantum-confined domains, are promising for polychromatic applications.
  • Results provide a framework for designing nanodevices for quantum information and communication technologies.