Do led lights create light from heat like normal incandescent bulbs?

Question

normal incandescent bulbs make light by glowing red hot. do led lights glow red hot as well? if not, then what creates the visible light from led's?

Answer 1

No.  Light is created as electricity jumps a gap between the two metal elements of the diode.

Answer 2

Basically, LEDs are just tiny light bulbs that fit easily into an electrical circuit. But unlike ordinary incandescent bulbs, they don't have a filament that will burn out, and they don't get especially hot. They are illuminated solely by the movement of electrons in a semiconductor material, and they last just as long as a standard transistor.

Answer 3

Not exactly but the general mechanism is the same. The current in bulbs excite the atoms of the wire filament - places its electron at a higher energy state - and those electrons spontaneously go to a lower state and emit a photon. This is done on a massive scale and we get incadescent light.

This "energy difference to create a photon" principle is used in semiconductors when an electron already in a higher energy state goes to a lower one and the energy lost is emitted as a photon of light.

The way it works is to put two semiconductor against each other and run a current through it. One semiconductor has excess electrons foating about from atom to atom because it was doped with an element that has a lot of free electrons to give up. The other semiconductor is doped with an element  deficient of electrons, so it can readily accept new electrons. When you place then side by side you find that there is an enegy level difference between the first and second type of semiconductor. When electrons travel down this energy difference a photon is emitted. Do this enoguh times - say, by running a current so you pump a lot of electrons "down the slide" to generate an ocean of photons - and Viola! Let there be light!

Answer 4

No, the photon is emitted when the electron moves from a higher energy state to a lower energy state within the semiconductor.

Answer 5

no the medum produces a cooler when charged.