Looking at LEDs

“Step right up, ladies and gentlemen,” shouts the salesman, “and be among the first to witness the marvelous qualities of these newfangled gadgets. They're guaranteed to last at least 100 times longer and work for almost any application you can imagine!” The salesman reaches out with a flourish and opens his hand to reveal a miniature device only a few millimeters wide, made of tiny semiconductor chips containing gallium nitride (GaN) and a mix of aluminum, indium, gallium, and phosphorus

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