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RE: quantum dots

Posted by geoffkait on May 29, 2011 at 03:17:42

In Reply to: RE: quantum dots posted by unclestu on May 27, 2011 at 12:59:24:

"The book makes a difference between quantum wells, quantum wires and quantum dots. The wires and dots can emit various spectra, with the wells being utilized for most of the commercial laser pointers we see on the market where by visible light is emitted from the top layer of the PNP junction."

And, getting a little closer to home, wells are utilized for lasers in CD players where invisible infrared light is emitted. And for lasers in DVD players where visible red light is emitted.

"The Quantum wire can emit much more powerful spectra, well beyond the visible spectra and the spectra is emitted from the center portion of the PNP wafer, The N portion of the wafer

So what? Quantum dots can be designed to emit beyond the visible spectrum, too. That's why they're called "programmable matter."

"The dots can be made small enough to involve de Broglie wavelength energy from the electrons captured in the wafer but my guess is that they could be made large enough to emit visible light."

The dots exist ONLY because of the de Broglie wavelength. I.e., the dots can ONLY be made very small, that's the whole point. And, even though they're very small, the dots can be made to emit visible light. Why do you think bottles of dots are red, green, blue, etc.?

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