What about heat ->electricity -> light? 2012/2/28 Mark Iverson-ZeroPoint <zeropo...@charter.net>
> The key wording is here:**** > > ** ** > > "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.**”**** > > ** ** > > It is converting **heat** energy to light… not electricity-to-light!!!**** > > ** ** > > Thus, as they **lower** the forward bias V, **electrical** efficiency > INCREASES because it is not using electrical current for operation; as > Jones said, it’s the E-field which ALLOWS the HEAT-to-LIGHT conversion. If > the material is not very conductive, one can have a large E-field with > miniscule current flow… thus, very little ELECTRICAL power use.**** > > ** ** > > -Mark**** > > ** ** > > *From:* Daniel Rocha [mailto:danieldi...@gmail.com] > *Sent:* Tuesday, February 28, 2012 9:21 AM > *To:* vortex-l@eskimo.com > *Subject:* Re: [Vo]:Over unity at MIT**** > > ** ** > > 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
