light emitting diode

miss photon

when forward bias of led is increased, the intensity of emitted light increases until it reaches a max after which it starts decreasing again.....why?
also, in which of the two cases is barrier potential greater, led or pn diode?

sphyics

pls make u r question more clear... (led is a type of pn diode) so wat do u mean by whose potential (barrier) is greater!!!

edmondng

i think he mean the intensity of LED increase as current increase, but then if current goes beyond rated max of LED, why the intensity goes down..??

http://en.wikipedia.org/wiki/Light-emitting_diode

dlgoff

The light intensity will go to zero if the current gets too high.

miss photon

Quote by sphyics

pls make u r question more clear... (led is a type of pn diode) so wat do u mean by whose potential (barrier) is greater!!!

i mean the normal pn diode used in circuits

NoTime

For single color LEDs (not the "white" ones) the barrier potential is coupled to the light output frequency.
If you look at the specs you will find that Red, Green and Blue LEDs have different barrier potentials.

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miss photon	light emitting diode Tweet when forward bias of led is increased, the intensity of emitted light increases until it reaches a max after which it starts decreasing again.....why? also, in which of the two cases is barrier potential greater, led or pn diode?

sphyics	pls make u r question more clear... (led is a type of pn diode) so wat do u mean by whose potential (barrier) is greater!!!

edmondng	i think he mean the intensity of LED increase as current increase, but then if current goes beyond rated max of LED, why the intensity goes down..?? http://en.wikipedia.org/wiki/Light-emitting_diode

dlgoff Recognitions: Gold Member Science Advisor	light emitting diode The light intensity will go to zero if the current gets too high.

NoTime Recognitions: Gold Member Homework Help Science Advisor	For single color LEDs (not the "white" ones) the barrier potential is coupled to the light output frequency. If you look at the specs you will find that Red, Green and Blue LEDs have different barrier potentials.