Question

LED (PN junctions): if you have a graph of V (x-axis)
vs ln(I) (y-axis), how do you calculate Vt (thermal voltage) and Is
(saturation current)?

While plotting the graph, do you take ln of the current in amps or
mA?

Answer #2

The Shockley equation describe the characteristic of LED.

I have attached a hand written description of your question along with the the characteristic graph for LED

The graph V against ln(I) will be a straight line passing through origin as you can see from the adjacent graph.

The quantity ln(I) would be a unitless quantity.

answered by: anonymous

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