What determines the emission peak energy of the blue luminescence in highly Mg-doped p-GaN?

Colton, J. S.; Yu, P. Y.
April 2001
Applied Physics Letters;4/23/2001, Vol. 78 Issue 17, p2500
Academic Journal
We report a study of the 2.8 eV blue luminescence (BL) in heavily Mg-doped p-GaN via resonant excitation with a tunable blue dye laser. The dependence of the BL on the excitation photon energy (E[sub ex]) is unlike that of the yellow luminescence found in n-type GaN. An Urbach-type band tail, with Urbach parameter of 33 meV is observed in the vicinity of the BL energy. We propose that the peak energy of the BL marks the transition from localized states to delocalized states within this band tail. © 2001 American Institute of Physics.


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