A broad excitation band in an excitation spectrum of (Gd,Y) BO3:Eu was observed in the VUV region. It could be considered that this band was composed of two bands at about 160 and 166nm. The preceding band was assigned to the BO3 group absorption. The later one at about 166nm could be assigned to the charge transfer (CT) transition of Gd3+-O2. Such an assignment was deduced from the result that broadbands at around 170nm for GdAlO3:Eu, and at 183nm for Gd2SiO5:Eu are due to the CTtransition of Gd3+-O2; this was also identified by CaZr (BO3)2:Eu. Since there are no Gd3+ ions in it; a weak band in the VUV region in the excitation spectrum of Ca0.95ZrEu0.05(BO3)2 was observed. The excitation spectra were overlapped between the CT transition of Gd3+-O2 and BO3 group absorption, and it caused the emission of Eu3+ effectively in the trivalent europium-doped (Gd, Y)BO3 host lattice under 147nm excitation. Intense broad excitation bands were observed at about 155nm for YBO3:Eu and at about 153nm for YAlO3:Eu; it could be attributed to the CTtransition between Y3+ and O2. As a result, under the xenon discharge (147nm) excitation, the intense emission of Eu3+ in GdBO3 was found to be more convenient just because of the partial substitution of Y3+ for Gd3+.