How to determine the threshold for an LED voltage

A density of current over voltage that is generated by one of my Labview OLED measurement systems is attached.  I'm trying to programmatically determine the threshold voltage.  When the data is displayed in the logarithmic scale it is possible to observe a charge injection clear (0.8, 0.000203).  The problem is that I can visually observe this value, but I'm not able to solve by program for her.  I tried to take the derivative to observe the changes of slope, but only to determine the operating voltage.  Any ideas how I could solve this value?

Thank you

E

You are on the right track, you just have to do deeper. Try to take the 2nd derivative and find the points where it is larger. This will show you where the log graph is concave upward and where is your ve. I've included a plot of Log (data), D (Log (data) and D (Log (Data), 2).) I also have zoomed in on the area of interest, then pay attention to the balance.

You may need to make some good assumptions. For example, with exactly what I posted above, you get Vth = - 0.4 or so. If you assume Ve > 0, then you get Vth = 0.8.

In addition, you probably want to do other fancy stuff such as: interpolate the data to get more points, smooth interpolation, trim the ends of the derived data (they want 0 according to your derived method).

Tags: NI Software

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