Engineering Commons^™

Concentration Dependent Fluorescence Lifetime In Nanocrystalline Y2o3:Eu Phosphors, Harald Kaps, Mohammad Lutful Arefin, Ulrich Herr, Heiko Paul

Publications and Scholarship

Nanocrystalline (Y_1-xEu_x)₂O₃ powder was synthesized via a chemical vapour reaction. X-ray diffraction revealed the structure of cubic yttria with crystallite sizes of about 5 nm. The Eu-dopand concentrations x for the samples in the range from 0.003 up to 0.165 were determined by EDX-spectra. The luminescence of the nanopowders was investigated by continuous and time-resolved UV-fluorescence spectroscopy and compared to a microcrystalline Y₂O₃:Eu phosphor as a reference. The emission spectra show an increasing intensity for higher doping concentrations. However, compared to the microcrystalline material the yield was significantly lower. …