In this study (Gd1-xYx)F-3 (x=0 2 04 0 5 0 6 and 0 8) crystals were grown by the mu-PD method Neither visible inclusions nor cracks were observed in (Gd1-xYx)F-3 (x=0 4 0 5 and 0 6) crystals Lattice constants increase linearly as the Y3+ concentration decreases Using (Gd1-xYx)F3 as a host material the Sr0 5% Ce1% 3% 5% and 7% co-doped Gd0 5Y0 F-5(3) single crystal was prepared In this crystal Ce(3+-)perturbed luminescence at 380 nm is observed with 31 8 ns photoluminescence decay time Under X-ray excitation rather high radioluminescence intensity of this band was obtained exceeding that of BGO scintillator The energy transfer in the sequence of regular Ce3+ -> (Gd3+)(n) -> perturbed Ce3+ sites was evidenced though observation of decay time shortening of the regular Ce3+ and Gd3+ centers and intensity change between Gd3+ and Ce3+-perturbed emission (C) 2010 Elsevier B V All rights reserved