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Wow, light emission at 36% of bandgap voltage.I have speculated here about that, how low a current and voltage can make light. I should have run that experiment.
low voltage LED
Jul 13, 2022
Last reply: 4 years ago
4 Replies
Let's. Have come a long way. Today's LEDs at 5ma are insane in brightness.
Cheers
A decent LED is visible in room light at 1 uA. I have seen a green LED at 1 nA. I didn't measure the voltage.
One could drive an LED with a square wave and detect with a PMT, do a lockin thing to get the statistics down to sub-photon resolution.
Below bandgap emission voltage is interesting physics. If the energy is electrical+thermal, does an emitted photon make the chip colder?
So, what voltage is 36% of bandgap voltage ? Or, what is the comparative bandgap voltage ?
We use some LEDs running at around 300 nA
boB
That depends on how efficient the laser is.
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