AlGaN Template

Blue LED is manufactured by growing a GaN material on a sapphire substrate, but it is difficult to use a GaN material for UV LEDs below 365 nm. Since GaN is a material with an energy band gap of 3.4 eV, it absorbs the light of shorter than 365 nm. To solve this problem, it is necessary to remove the GaN material as shown in the figure below, or use an AlGaN material with an energy band gap wider than the wavelength of the emitted light.

Semipolar Template