Hi, I'm not sure if this post fits here, so mods, feel free to move it or delete it if it doesn't.
Today, out of sheer boredom, I decided to put an LED in its reverse polarity in my 5CT1N curve tracer. I wanted to destroy some LEDs just for the fun of it. But this particular LED survived the curve tracer which can reach 200v. This was mostly due to the LED loading down the output to a maximum of 48 volts.
I also noticed an interesting phenomenon, where the LED glows in reverse polarity. The glow is similar to a small incandescent lamp being lit dimly, but the LED shows no signs of damage. The LED still works just fine after, and I do not see any kind of burnt resin. This piqued my interest as usually, an LED shouldn't glow in reverse polarity, but my test was under extreme conditions. The LED is green, but it glows a warm color in reverse.
This LED is NOS. Likely 1980s or 90s.
I searched around the internet but could not find anything resembling my test.
Perhaps someone here on the forum could explain this?
Here are some quantitative measurements I could take from this LED via the 5CT1N.
Peak reverse current at -48v: 6.4mA
Forward voltage drop of 1.775v