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We prepare and optically characterize a thin film of GaN:Eu. Room temperature intense emission band at around 620 nm is observed, corresponding to 5D0 → 7F2 electronic dipole transition of Eu3+ ions in the GaN host material. At lower temperatures, three components, at 621, 622, and 623 nm, arising from different Eu3+ optical centers, can be distinguished. Using a combination of variable stripe length (VSL) and shifting excitation spot (SES) methods we investigate optical gain of this Eu-related PL band at room temperature and determine its lower limit to be approximately 14 cm−1

Investigation of optical gain in Eu-doped GaN thin film grown by OMVPE method