Abstract
Mg-doped GaN micro-crystals were prepared by using the direct reaction of liquid Ga with NH 3 gas. Magnesium chloride (MgCl 2) was employed as an Mg source in the growth. The growth rate and size of the Mg-doped GaN micro-crystals increased with the amount of MgCl 2. The micro-crystals grew with a hexagonal structure. A broad band emission peak was observed at ∼2.7 eV and its intensity increased with Mg concentration in the GaN micro-crystals. It seemed that the increase of the growth rate and the size of the micro-crystals were due to the presence of Mg and Cl species in the growth reaction. Catholuminescence also showed the blue emission at 2.85 eV due to a deep Mg-related complex.
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