News / In Focus

X-ray nanoprobe, X-ray fluorescence, X-ray excited optical luminescence, X-ray absorption
NSRRC Scientist Bi-Hsuan Lin’s Research on the Characterization Methods of X-ray Nanoprobe Highlighted as the Cover of Journal of Synchrotron Radiation
NSRRC Scientist, Dr. Bi-Hsuan Lin, successfully developed and demonstrated visualization methods for the characterization of europium (Eu)-doped BaAl2O4 phosphors using X-ray nanoprobe techniques at TPS 23A of the NSRRC. The research was published in Journal of Synchrotron Radiation and was highlighted as the cover of the March issue.
Dr. Lin’s team used X-ray fluorescence (XRF) mapping, which not only gave information on the elemental distributions but also clearly revealed the valence state distributions of the Eu2+ and Eu3+ ions. The accuracy of the estimated valence state distributions was examined by performing X-ray absorption spectroscopy (XAS). Their corresponding emission distributions were obtained via XEOL mapping, and the emission properties were understood through correlation analysis. The results demonstrated that the main contribution to the luminescence intensity of the Eu-doped BaAl2O4 came from the Eu2+ activator and the emission intensity would not be influenced by the concentration of Eu2+ or Eu3+ ions. With the powerful characterization capabilities, the X-ray nanoprobes at TPS 23A opens new avenues for unravelling the emission mechanisms of phosphor materials.