Ga2O3(Gallium Oxide) has a refractive index near 1.45 at 550 nm and transmits wavelengths below 300 nm. It is a popular wide-bandgap (up to 5 eV) material, characterized by good chemical and thermal stability. Ga2O3 thin films are used as luminescent phosphors as well as in high-temperature oxygen sensors and also as antireflection or passivation coatings on GaAs and other deep-UV-transparent oxides.
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