Eu-doped GaN was grown by organometallic vapor phase epitaxy at temperatures from 900 to 1100°C. Eu incorporation is influenced by temperature with the highest concentration found for growth at 1000°C. In all samples, Eu is incorporated entirely on substitutional Ga sites with a slight displacement which is highest (0.2Å) in the sample grown at 900°C and mainly directed along the c-axis. The major optical Eu3+ centers are identical for in situ doped and ion-implanted samples after high temperature and pressure annealing. The dominant Eu3+ luminescence lines are attributed to isolated, substitutional Eu.

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