Optical spectroscopy of molybdates with composition Ln2Zr3(MoO4)9 (Ln: Eu, Tb)

This study examined the luminescent properties of systems of double molybdates doped with Eu and Tb - this includes emission, excitation and absorption spectra. The compounds exhibited bright luminescence in the visible region due to the [Xe]4fn → [Xe]4fn transitions of rare-earth ions. The luminescence is excited both in the [Xe]4fn → [Xe]4fn bands of the rare-earth ions and in the wide band in the ultraviolet region related to the transitions within the Mo-O complex. Because of the energy transfer, the luminescence of Tb3+ and Eu3+ in doubly doped molybdates has had common excitation energies.