Quantum dots unstable?

  • Thread starter PRodQuanta
  • Start date
  • #1
PRodQuanta
342
0
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
Staff Emeritus
Science Advisor
Gold Member
10,275
40
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
bdkeenan00
50
0
What is a quantum dot?
 
  • #4
chroot
Staff Emeritus
Science Advisor
Gold Member
10,275
40
An effectively zero-dimensional confinement apparatus for electrons.

- Warren
 
  • #5
PRodQuanta
342
0
You know what I meant (or so I hope) when I said slower moving one. Lower frequency.
Paden Roder
 
  • #6
toozie
2
0
The excess energy is converted to thermal (lattice vibrations), and ultimately coupled out through the surface to the surrounding medium.
 

Suggested for: Quantum dots unstable?

Replies
0
Views
313
Replies
1
Views
248
  • Last Post
Replies
8
Views
301
Replies
3
Views
443
  • Last Post
Replies
17
Views
2K
  • Last Post
Replies
7
Views
367
  • Last Post
Replies
10
Views
193
  • Last Post
Replies
10
Views
231
  • Last Post
Replies
4
Views
412
  • Last Post
Replies
2
Views
243
Top