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whisky-dave[_2_] whisky-dave[_2_] is offline
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Default Why do LEDs generate heat?

On Thursday, 3 October 2019 14:45:38 UTC+1, Commander Kinsey wrote:
On Thu, 03 Oct 2019 14:37:34 +0100, whisky-dave wrote:

On Thursday, 3 October 2019 14:29:30 UTC+1, Commander Kinsey wrote:
Why do LEDs generate heat? I want a technical answer not "because they're inefficient".


That is the technical answer just like why does a wire get hot when curremnt passes through it.


No, the technical answer would explain what part of it has resistance.


Every conductor has resistance apart from perhaps a superconductor.
yuo also have theb curent passing from one type of conductor to another.
One of those conductors will convert the energy to light and heat.
They won;t create much IR or UV because the material chosen was chosen because it emits the required wavelengh of light and not much eles.

and if it can be overcome by using different materials.


No they have been trying for years and until someone can come up with a magic substance that has zero resistance that is.

And are you sure it's even resistance? It could be some photons are reabsorbed before they escape the LED, generating heat.


No that would be IR 'heat' , and why would photons be re-absorbed anyway ?



And will we ever make them more efficient?


Probably.