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I Emission of Quantum Dots

  1. Nov 20, 2016 #1
    If quantum dots are placed within the body, what is the excitation needed for us to observe its emission? X-rays?

    I have heard that Quantum dots are used in solar cells. How does the process work for the conversion of light to electricity?

    I also heard that Quantum dots can emit ultra violet light. What is the energy required to excite these quantum dots to emit ultra violet light?
     
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  3. Nov 21, 2016 #2

    Ygggdrasil

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    Quantum dot luminescence generally occurs in the visible range of the spectra. This makes imaging in patients difficult as scattering limits the penetration depth of visible light into the human body.

    This depends on the exact type of QDs used, but in general, you would need wavelengths shorter than those you want the quantum dots to emit (so, excitation would generally require UV wavelengths as well). Multiphoton excitation, however, might enable excitation with visible light.
     
  4. Nov 22, 2016 #3

    f95toli

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    Note that "quantum dot" is a very generic term and you can't really say anything about the properties unless you specify which type you are referring to. T
    he dots I've worked with had transition energies ~100 GHz or so, i.e. orders of magnitude lower than dots used in the visible spectra
     
  5. Nov 22, 2016 #4
    Is there an article that talks about this?
     
  6. Nov 22, 2016 #5
    By any chance do you have a list of quantum dots used for specific application?
     
  7. Nov 22, 2016 #6

    f95toli

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    No, and such a list would not really make much sense.

    A quantum dot is "class" of quantum systems, the basic theory is actually quite simple but there are LOT of different ways of creating quantum dots and there is a HUGE number of possible (and not-so-possible) applications and they don't really have much in common.
     
  8. Nov 22, 2016 #7

    Ygggdrasil

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    Which topic exactly? Imaging quantum dots in living systems? Imaging living systems in general? Multiphoton microscopy?
     
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