A semiconductor with a comparatively large band gap; short-wavelength light-emitting diodes require sufficiently energetic optical transitions.
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A wide-bandgap semiconductor is a type of semiconductor material that has a relatively large bandgap energy, typically greater than 2 electron volts (eV). The bandgap is the energy difference between the valence band, where electrons are normally present, and the conduction band, where electrons are free to move and conduct electricity.