# forward voltage of LED diode

1. ## forward voltage of LED diode

I found all the LED diode have a minimal forward voltage of 1.7V. Anyone knows that whether there are some LED diode with forward voltage less than 1V, and the forward current is less than 20mA? Thank you.  Reply With Quote

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2. ## Re: forward voltage of LED diode

Forward voltage drop depends on the LED wavelength.
IR diodes indeed have forward voltages of around 1.7 volt, blue diodes are over 3 volts.

But less than 1 volt?
No.

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3. ## Re: forward voltage of LED diode

Oh, that is the reason. Thank you.  Reply With Quote

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4. ## Re: forward voltage of LED diode

Anyone knows that whether there are some LED diode with forward voltage less than 1V, and the forward current is less than 20mA?
Current is not the issue, it is the voltage drop. That is the barrier energy.

Say you have a forward drop of 1V. One electron crossing the barrier will get an energy of 1 eV - this is in energy terms approx 1.2um wavelength of light.  Reply With Quote