Fig. 2From: Study of energy transfer mechanism from ZnO nanocrystals to Eu3+ ions a PLE spectra of Eu3+:SiO2, ZnO-nc:SiO2 and Eu3+ 0.12:(ZnO-nc:SiO2) samples. b Schematic Dieke energy level diagram of the Eu3+ ions in SiO2 Back to article page