Electroluminescence spectra of p-GaSb-n-Gasub(1-x)Insub(x)Sb heterojunctions

Electroluminescence spectra of heterojunctions p-GaSb-n-Gasub(1-x)Insub(x)Sb are studied in the range of compositions 0 < x < 0.2 depending on the current density j and temperature T. The position of maximum in the radiation spectrum at high current densities (j approximately 103 A/cm2) is in agreement with values of the forbidden band width Esub(g)(x,T). At 78 K moving spectral bands were observed in the range of 1.7 - 2.5 μm, which may be explained by models of diagonal tunneling and filling up tails of state density in a solid solution. Narrowing spectrum from 100 to 40 meV was also observed with increasing current due to filling up the tails