Luminescence of yttrium niobium-tantalate doubly activated by europium and/or terbium under X-ray and electron beam excitation

► The Y(Ta,Nb)O4 phosphors were activated by rare earth ions such as Eu3+ and Tb3+. ► The phosphors were studied under X-ray and electron beam excitations. ► The emission centers contribute efficiently to the overall luminescence. ► Changing the concentration of the activators resulted in a broad luminescence.