Fig. 3From: Preliminary Studies on Biodegradable Zinc Oxide Nanoparticles Doped with Fe as a Potential Form of Iron Delivery to the Living OrganismPhotoluminescence (PL) emission (a, λexc = 260 nm) and excitation (b, λem = 595 nm) spectra of ZnO:Fe NPs. Samples were loosely poured into the aluminum matrix then rebalanced to enable PL measurements. Second and higher orders of excitation wavelength were filtered with spectral bandpass filterBack to article page