What is the main element used in blue LEDs?
Gallium
Silicon
Carbon
Iron
Answer
Gallium is the primary element used in blue LEDs. These LEDs emit light in the blue region of the visible spectrum, making them essential for applications such as displays, traffic lights, and medical devices. Gallium-based semiconductors, such as gallium nitride (GaN), have a wide bandgap that allows them to emit high-energy blue light efficiently.
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