Abstract
Eu is incorporated into CaF2 films grown on Si(100) by molecular beam epitaxy using elemental Eu evaporation. Eu doping as high as 4.05 at. % does not significantly degrade the surface morphology, indicating a relatively high solubility of Eu in CaF2. Photoluminescence spectra from Eu-doped CaF2 show strong blue emissions from Eu2+ ions in cubic sites. The inhomogeneous broadening of the zero-phonon line near 24 190 cm−1 is reduced by ∼20% upon in situ annealing at 1100 °C.
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