What It Really Took to Make the First Blue LED
33:44
MSNVeritasium
What It Really Took to Make the First Blue LED
Making a blue LED was once thought impossible. Unlike red or green, producing blue light required a semiconductor with a much larger energy band gap. For decades, the right material didn’t exist—or at least, no one knew how to grow it properly. It took years of failed experiments, breakthroughs in crystal growth techniques, and sheer ...
4 个月之前
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