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

被引:12
作者
Colton, JS [1 ]
Yu, PY
机构
[1] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
[2] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA
关键词
D O I
10.1063/1.1367904
中图分类号
O59 [应用物理学];
学科分类号
摘要
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-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. (C) 2001 American Institute of Physics.
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页码:2500 / 2502
页数:3
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