Quantum dots unstable?

  • Thread starter PRodQuanta
  • Start date
341
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
 

chroot

Staff Emeritus
Science Advisor
Gold Member
10,166
34
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
 
49
0
What is a quantum dot?
 

chroot

Staff Emeritus
Science Advisor
Gold Member
10,166
34
An effectively zero-dimensional confinement apparatus for electrons.

- Warren
 
341
0
You know what I meant (or so I hope) when I said slower moving one. Lower frequency.
Paden Roder
 
2
0
The excess energy is converted to thermal (lattice vibrations), and ultimately coupled out through the surface to the surrounding medium.
 

Related Threads for: Quantum dots unstable?

  • Posted
Replies
1
Views
3K
  • Posted
Replies
7
Views
818
  • Posted
Replies
17
Views
4K
Replies
0
Views
2K
Replies
12
Views
1K
Replies
1
Views
418
  • Posted
Replies
10
Views
1K

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving
Top