Band gap energy of GaSbxN1-x across the whole composition range

A model for the band gap energy of GaSbxN1-x across the entire composition range is established. It is found that the model can estimate the band gap energy of GaSbxN1-x wonderfully. It is also found that the calculated band gap minimum in this work is about 0.09 eV at x = 0.82, which indicates that the band gap energy of GaSbxN1-x is not negative over the whole composition range. In addition, GaSbxN1-x should have a direct band gap over the entire composition range.