Abstract
We investigate GaN codoped with Eu and Mg from calculations on the density functional theory. As a result, we obtain the total energies that are almost independent of Mg positions relative to Eu positions. The result suggests the coexistence of the luminescent centers that are Eu–Mg complexes and typical Eu atoms at least. Eu ions are trivalent in both centers; hence, the magnetization in the ground state 7F0 is zero. Considering the low excited states via the Boltzmann distribution, we can expect the finite magnetization on each Eu atom, but the Curie temperature is unlikely to be room temperature.
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