Abstract
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.
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