Abstract
Photoluminescence has been measured from 100 to 300 nm epitaxial thin films of MnF 2 prepared on Si(1 1 1) substrates and having α-PbO 2 orthorhombic structural type. The dominant luminescence consists of a broad band peaking around 575 nm with a gradual tail extending to longer wavelengths. Weak spectral line features are observed on the short-wavelength side of the main band and are associated with magnon sidebands of Mn 2+ excitons that are perturbed by Mg and Ca impurities. Of note is a blue shift (∼12 nm) of these sidebands when compared to their positions in bulk MnF 2. The shift can be associated with different crystal field for Mn 2+ ions in orthorhombic phase.
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