In Reply to: RE: Oh, goodie, quantum dots! Now, we're getting somewhere. nt posted by 6bq5 on May 24, 2011 at 14:46:22:
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. 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 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. However, the author makes the distinction that the dots have the N layer holding the electrons and the P layer sandwich creating the boundaries for those electrons.
The wavelengths you mention seem to span the visible yellow to red spectra. It's amazing the tightness with which you could tune those frequencies. The doping necessary to fabricate them must have been incredibly small but even, in order to achieve that kind of commercial QC.
Stu
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Follow Ups
- RE: quantum dots - unclestu 12:59:24 05/27/11 (9)
- RE: quantum dots - geoffkait 03:17:42 05/29/11 (8)
- Bottles of dots? - rick_m 07:55:16 05/29/11 (7)
- RE: Bottles of dots? - geoffkait 08:03:52 05/29/11 (6)
- RE: Bottles of dots? - rick_m 12:17:45 05/29/11 (5)
- RE: Bottles of dots? - geoffkait 12:59:45 05/29/11 (4)
- RE: Bottles of dots? - rick_m 14:02:40 05/29/11 (3)
- RE: Bottles of dots? - geoffkait 14:09:35 05/29/11 (2)
- RE: Bottles of dots? - 6bq5 12:26:01 05/31/11 (1)
- RE: Bottles of dots? - geoffkait 03:39:15 06/01/11 (0)