This is Why it was Nearly Impossible to Develop a Blue LED
techeblog.com
This is Why it was Nearly Impossible to Develop a Blue LED
You've seen transparent OLEDs, but did you know that the blue LED was notoriously hard to make due to p-type gallium nitride? That's right, they had to figure out how to make a blue LED was that would continue to operate for hundreds of hours, without destroying itself. Each blue photon has higher energy than a red photon or a green photon ...
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