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Is It Physics or Engineering?
If it was easy to manufacture light sources along with transistors on a silicon chip, they would be everywhere. People have been trying for decades and it's actually extremely difficult. The way that the energy bands are structured in silicon, you're never going to make silicon efficient as a light source at room temperature without doing very exotic things which degrade its ability to interface nicely with those transistors. So that's like one of these things where it's, why is nature dealing with that blow?