The concentration quenching of photoluminescence in Eu3+-doped La2O3

Authors:
  • VĐV. Đorđević
    V. Đorđević
  • ŽAŽ. Antić
    Ž. Antić
  • MNM. G. Nikolić
    M. G. Nikolić
  • MDMiroslav D Dramićanin
    Miroslav D Dramićanin
  • MDM. D.
    M. D.
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Abstract
This work explores the influence of dopant concentration on photoluminescent emission and kinetics of Eu3+-doped (0.2−10 at.%) nanocrystalline lanthanumoxide powders. The X-ray diffraction analysis confirmed that all samples crystallize in La2O3 hexagonal phase with space group P3¯ m1. Transmission electron microscopy showed particles with non-uniform shape and diverse size distribution with an average particle size of (95 ± 5) nm. The room temperature photoluminescence spectra of all samples contain characteristic Eu3+ luminescence lines with the most pronounced red 5D0 →7F2 emission at about 626 nm. The maximum intensity of red emission is observed for the sample containing 5at.% of Eu3+ ions. The emission kinetics was recorded in the temperature range from 10K to 300 K. The maximum lifetime value of 0.98 ms obtained for the sample with 0.5at.% Eu3+ at room temperature increases up to 1.3ms at 10 K.