Abstract: Single phase of Gd_1-xEu_xAl₃(BO₃)₄(0≤x≤1) was obtained by the evaporation of its nitrate solution,
and calcinations at 1000℃ for 24h. Ultraviolet (UV) and vacuum ultraviolet (VUV) luminescent properties of Eu³⁺ in GdAl₃(BO₃)₄
were systematically studied. In GdAl₃(BO₃)₄:Eu³⁺, rare earths are located in noncentrosymmetric sites, and the predominant emission of
Eu³⁺ is ⁵D₀→⁷F₂. GdAl₃(BO₃)₄:Eu³⁺ shows intense red emission with CIE chromaticity coordinates of (0.645, 0.330)
under 147nm excitation, it indicates that this phosphor is a promising new luminescent material for application in plasma display panel (PDP). The VUV
excitation spectra of activated GdAl₃(BO₃)₄:Eu³⁺ are composed of two broad bands. The 158nm excitation band is assigned to the energy level
of BO₃ groups and the other band centered at 258nm is assigned to the charge transfer transition between Eu³⁺ and O^2-. The GdAl₃(BO₃)₄:Eu³⁺
shows maximum intensity emission for the doped 50at% of Eu³⁺ under 258nm excitation and 5at% of Eu³⁺ under 147nm excitation, respectively.
Therefore, the energy relaxation pathway to the Eu³⁺ sites should be different.

Key words: GdAl₃（BO₃）₄, luminescence, UV, VUV