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Gallium nitride
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=== LEDs and lasers === GaN-based violet [[laser diode]]s are used to read [[Blu-ray Disc]]s. The mixture of GaN with [[indium|In]] ([[indium gallium nitride|InGaN]]) or [[Aluminium|Al]] ([[Aluminium gallium nitride|AlGaN]]) with a band gap dependent on the ratio of In or Al to GaN allows the manufacture of light-emitting diodes ([[LED]]s) with colors that can go from red to ultra-violet.<ref name=review/>
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