- Dec 27, 2011
The best published records are now down around something like 10^7 cm^-2, or something like that, I don't recall off the top of my head. It really depends what you're trying to make. For cheap LEDs on sapphire, there are a lot of threads. That's all they had back then, and there are still a LOT of devices made that way. For high-performance stuff, like lasers, threads are a bigger issue, so they do a lot more work in that area.Also, any new developments wih gallium nitrate crystal and the displacement of 10^10 but still having the transmission ability for a diode?