Abstract
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► Phosphors samples were prepared by solid-state reaction route. ► Y(Ta,Nb)O4 phosphors activated by Eu3+ and Tb3+. ► Radioluminescence spectra of Y(Ta,Nb)O4 phosphors. ► Rare earth transitions are particularly sensitive to the site symmetry.
This paper reports the luminescence emission spectra of Y(Ta,Nb)O4 activated by rare earth ions such as Eu3+ and Tb3+. The influence of these rare earth ions on the radioluminescence (RL) of yttrium niobate and tantalate phosphors was investigated. The luminescent properties were studied under X-ray and preliminary RL measurements to further evaluate prepared materials. The emission centers of the rare earth activators (Eu3+, Tb3+) were found to contribute efficiently to the total luminescence. With their various luminescence chromaticities, these rare earth activated phosphors are promising materials for solid-state lighting applications as well as for X-ray intensifying screens in medical diagnosis, providing the broad band variation of visible RL from blue to red.