Development of Eu-doped Gd3Al3Ga2O12 Nanoparticles for In vivo Applications

Red-emitting scintillator nanoparticles based on Eu-doped Gd 3 Al 3 Ga 2 O 12 were developed.Nanoparticles of 100-300 nm size were successfully obtained.The photoluminescence (PL) and X-ray-induced radioluminescence spectra had sharp peaks in the wavelength region of 590-820 nm, which are attributed to the 4f-4f transitions of Eu 3+ ions.The Eu concentration dependence of the emission properties was investigated.The PL quantum yield was the highest (98.4%) for the Eu concentration of 5% with respect to (Gd + Eu).Judged from the high PL quantum yield and radioluminescence in the red wavelength region, the development of the red-emitting nanoparticle scintillators was successful.