This study considers the effects of hydrostatic pressure on the line position and fluorescence lifetime tau for D-5(0) -> F-7(2) transitions in Ga3Ga5O12 doped with Eu3+ nanoparticles. The results indicate that the pressure induced lines red shift towards longer wavelengths for all considered lines with different rate. The fluorescence lifetime tau rapidly decreases with pressure from an ambient pressure up to about 20 kbar and after that it is essentially unchanged up to the end of the considered pressure range. High pressure induced red-shift and fluorescence lifetime T can be explained by a simple model. A satisfactory agreement between measured and theoretical predicted lines position and tau was obtained. (C) 2011 Elsevier B.V. All rights reserved.