Polymer complex solution synthesis of (Y_xGd_(1-x))_2O_3: Eu~(3+) nanopowders

摘要

Yttrium-gadolinium-europium oxide phosphors are regarded promising for many important optical applications, for example in computed tomography medical imaging and plasma displays. In this work, we investigated procedure for (Y_xGd_(1-x))_2O_3:Eu~(3+) (x = 0, 0.25, 0.5, 0.75 and 1) nanopowder synthesis using polymer complex solution method (PCS) based on polyethylene glycol fuel (PEG). Structural and emission properties of nanopowders are investigated by X-ray diffraction, electron microscopy and photoluminescence measurements. We obtained particles of about 40 nm having excellent structural ordering in cubic bixbyte type of structure - space group Ia3 for all mixed oxide compositions. Luminescence emission measurements exposed characteristic transition of the trivalent europium ion incorporated into insulating host. ~5D_1 and ~5D_0 decay time values are measured to obtain information on different kinetic processes occurring for these two emitting levels.