Blue Anti-Stokes Electroluminescence in GaN

Abstract

Blue electroluminescence has been observed in GaN when the energy supplied to each electron is more than $48kT$ below the energy of the emitted photons. The emission increases with the cube of the current. An external power efficiency of 3 × ${10}^{-4\mathrm{}}$ was obtained. Several excitation mechanisms by two hot electrons are considered.