quantum dots unstable?

[PRodQuanta]

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]

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

[bdkeenan00]

What is a quantum dot?

[chroot]

An effectively zero-dimensional confinement apparatus for electrons.

- Warren

[PRodQuanta]

You know what I meant (or so I hope) when I said slower moving one. Lower frequency.
Paden Roder

[toozie]

The excess energy is converted to thermal (lattice vibrations), and ultimately coupled out through the surface to the surrounding medium.