Indium gallium nitride is a semiconductor material made of a mix of gallium nitride (GaN) and indium nitride (InN). It is a ternary group III/group V direct bandgap semiconductor. Its bandgap can be tuned by varying the amount of indium in the alloy.
InxGa1−xN has a direct bandgap span from the infrared for InN to the ultraviolet of GaN.
The ratio of In/Ga is usually between 0.02/0.98 and 0.3/0.7.
InGaN blue LED (380–405 nm)
Indium is a chemical element; it has symbol In and atomic number 49. It is a silvery-white post-transition metal and one of the softest elements. Chemically, indium is similar to gallium and thallium, and its properties are largely intermediate between the two. It was discovered in 1863 by Ferdinand Reich and Hieronymous Theodor Richter by spectroscopic methods and named for the indigo blue line in its spectrum.
Indium
Indium wetting the glass surface of a test tube
A magnified image of an LCD screen showing RGB pixels. Individual transistors are seen as white dots in the bottom part.
Ductile indium wire