If it is a cooler, it appears to violate the first law. If it is an energy converter, it appears to violate the second law.
I guess the question is: what is it? Harry On Tue, Feb 28, 2012 at 12:58 PM, Daniel Rocha <danieldi...@gmail.com> wrote: > The diode is working as a cooler. > > 2012/2/28 Harry Veeder <hveeder...@gmail.com> >> >> According to the second law you can only get a system to do "work" if >> parts of the system are at different temperatures. In this situation >> the system is a diode and it does work by converting heat into light. >> It is hard to tell from the description, but I am guessing the entire >> diode is at an elevated temperature. >> >> harry >> >> On Tue, Feb 28, 2012 at 12:20 PM, Daniel Rocha <danieldi...@gmail.com> >> wrote: >> > Why do you think it would violate the 2nd law? I don't understand. >> > >> > 2012/2/28 Harry Veeder <hveeder...@gmail.com> >> >> >> >> On Tue, Feb 28, 2012 at 11:57 AM, Daniel Rocha <danieldi...@gmail.com> >> >> wrote: >> >> > Pay attention at this: >> >> > >> >> > " Experiments directly confirm for the first time that this behavior >> >> > continues beyond the conventional limit of unity >> >> > electrical-to-optical >> >> > power >> >> > conversion efficiency." >> >> > >> >> > It is above the conventional, not that it produces energy out of >> >> > nothing. >> >> > This is just a way of saying that it exceeded expectation of light >> >> > emission >> >> > for a LED. >> >> >> >> >> >> Yes. It uses electricity to change heat into light. The abstract: >> >> >> >> "A heated semiconductor light-emitting diode at low forward bias >> >> voltage V<kBT/q is shown to use electrical work to pump heat from the >> >> lattice to the photon field. Here the rates of both radiative and >> >> nonradiative recombination have contributions at linear order in V. As >> >> a result the device’s wall-plug (i.e., power conversion) efficiency is >> >> inversely proportional to its output power and diverges as V >> >> approaches zero. Experiments directly confirm for the first time that >> >> this behavior continues beyond the conventional limit of unity >> >> electrical-to-optical power conversion efficiency." >> >> >> >> >> >> however, wouldn't this require a violation of the second law of >> >> thermodynamics? >> >> >> >> Harry >> >> >> > >> > >> > >> > -- >> > Daniel Rocha - RJ >> > danieldi...@gmail.com >> > >> > > > > -- > Daniel Rocha - RJ > danieldi...@gmail.com >
