The complex bis(1,10-Phen)Eu(NO3)3 was synthesized from EU203 with complexing ligand 1,10-phenanthroline. Composition, structural characteristics and the nature of the complexes were determined by the methods: SEM-EDX, IR spectra, thermal analysis- TGA, 'H-NMR, 13C-NMR spectrum, UV-VIS spectras and fluorescence spectroscopy. Bis (1,10-Phen)Eu(NO3)3 was used to make the masterbatch, application in polymer as light absorption and convertion additives the basis of LDPE.