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I recognize gallium at least as a dopant material (what transforms the pure sillicon, which is an isolator, in the the n-side or the p-side of a semiconductor junction, where gallium specifically is used in light emitting junctions such as in LEDs) and a quick search showed that antimony is also a dopant.
(For the curious, here's the Wikipedia article)
As you might have noticed, even my short explanation of what a dopant is actually requires people to understand to an advanced level what semiconductors actually are made of, so I can see why an AP article which is targetting the average person wouldn't go into that specific rabit hole of explaining stuff that requires more stuff to be explained which in turn requires even more stuff to be explained and so on.
Also, I would be surprised if there are more than a handful of journalists in the World with even the most basic understanding of how semi-conductors work.
There is a fantastic video on YouTube about this, Veritasium I believe, the one about blue LEDs. I'll go looking, brb.
Edit: I have returned. https://youtu.be/AF8d72mA41M
I believe this is the video but I'm at work and can't watch it again right now.
Yep, that's the video you wanted.