Radiative and energy-transfer processes in LiGd1-xF4:Eu-x(3+), where the ground state of Gd3+(8S(7/2)) was selectively excited to the I-6(J) state by a 275-mn pulsed laser irradiation, were studied by time-resolved luminescence spectroscopy. Two decay components were observed in Gd3+:P-6(7/2) --> 8(S7/2) emission at 313 nm. One was influenced by the Eu3+ addition, and the other was not. The Eu3+-sensitive decay rate increased up to similar to1.0 mol % and then remained almost constant up to 10 mol % Eu3+. The Eu3+-insensitive decay had a rate of about 7 x 10(2) s(-1) (tau approximate to 1.5 ms). The intrarelaxation rate of the I-6(J) state to the luminescent P-6(7/2) state of the Gd3+ ion was estimated to be about 1.3 x 10(5) s(-1) from the rise of the 313-nm luminescence (tau(rise) approximate to 8,us). This rate was almost independent of the Eu3+ concentration. The luminescence intensity from Eu3+ at around 591 nm and at 613 nm monotonically increased with increasing Eu3+ concentration up to 1.0 mol % Eu3+, above which it remained constant. This implies the absence of more efficient energy transfer from Gd3+ to Eu3+ at higher Eu3+ concentration. The emission lifetime of the D-5(0) state of Eu3+ ion was estimated to be about 8 ms.