These files contain photoluminescence (PL) spectra measured at the University of Strathclyde from GaN(Mg):Eu thin film samples. Each file is in a tab-delimited ASCII text format, in which the first column contains wavelength values (in nanometres) and the subsequent column(s) contain PL intensity values (in CCD counts). Further analysis of this data has been published in the associated Applied Physics Letters article, and the file titles correspond to the figure numbers in this article.