Quantum dots unstable?

  • Thread starter PRodQuanta
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  • #1
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Sandia National lab reported that quantum dots absorb near UV and re-emit at the visible range. It's wavelength shifts to a longer wavelength with 60% efficiency.

Does this mean quantum dots are unstable? Since they add mass to themselves. This makes them something different from what they were initially. I come to this conclusion that they add mass by the knowledge that the quantum dots absorb a high frequency photon and release a slower moving one.

Thoughts?
Paden Roder
 

Answers and Replies

  • #2
chroot
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I have the feeling the dots emit more low-frequency photons than they absorb high-frequency photons.

Also, all photons move at the same speed: c.

- Warren
 
  • #3
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What is a quantum dot?
 
  • #4
chroot
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An effectively zero-dimensional confinement apparatus for electrons.

- Warren
 
  • #5
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You know what I meant (or so I hope) when I said slower moving one. Lower frequency.
Paden Roder
 
  • #6
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The excess energy is converted to thermal (lattice vibrations), and ultimately coupled out through the surface to the surrounding medium.
 

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