Recent content by johnuk

  1. J

    How Are Bandgaps Tuned and Modified in LEDs?

    I understand diodes and depletion zones between two different materials, like Schottkys, and that dopants are added to silicon to make it P or N and increase the current carrying capacity. Adding things that offer steps within it would seem to be drifting from the idea of creating a direct...
  2. J

    How Are Bandgaps Tuned and Modified in LEDs?

    Interesting, interesting... I know that commercially the error in the wavelength gets 'fixed' by simply sorting them into different bins, like ball bearings are 'fixed' for size by sorting them by size after production. In my possibly over simplified take on things, I thought the light emitted...
  3. J

    How Are Bandgaps Tuned and Modified in LEDs?

    I know the width of possible band gaps for something like an LED depends on the P and N material present, and that they can change them by altering the density (doping) of the charge carriers in the two. Do they also have ways to implant or strip carriers from the layers other than doping...
  4. J

    Latent heat and colligative properties

    I found one, there's a gigantic table in the CRC Handbook I mentioned. I also tried a few experiments, putting various concentrations of salt / ethylene glycol into water and freezing them. Almost none of the salt ones actually froze, despite the concentrations being theoretically low enough...
  5. J

    Latent heat and colligative properties

    Bump, still searching, still haven't found one. The only possible location of one a good one is in the CRC Handbook of Chemistry and Physics, but I need an athens account to look at that or to buy a copy at £83. Does anyone have an athens? Could you have a look and see what the tables look...
  6. J

    What's the energy source for capillarity to lift liquid up?

    This is an excellent question! :smile:
  7. J

    Latent heat and colligative properties

    I have a couple of questions about this. I know what it is, but need information on specific values. I've been trying to find a table listing as many compounds as possible by their latent heat capacity. I'm also interested in their approximately melting point and would prefer them both in the...
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