The role of compensation defects in Eu3+ stabilization under reductive atmosphere in Sr2SiO4 matrix
Karol Szczodrowski , Justyna Barzowska , Natalia Górecka , Marek Grinberg
AbstractLuminescent materials based on strontium orthosilicate doped with a fixed concentration of europium and co-doped with various concentrations of sodium, lithium and boron were synthesized in order to study the role of co-dopants in luminescent properties of europium ions. The obtained materials were characterized using powder X-ray diffraction (XRD) technique. The results of the optical measurements indicate that the incorporation of sodium or lithium increases emission intensity of Eu3+, but does not stabilize Eu3+ under reductive (5% H2/N2) atmosphere, which was observed for the boron co-doping. Moreover, it is shown that the sodium or lithium co-doping facilitates the reduction process of Eu3+ → Eu2+. The obtained results suggest that diffusion limited processes are crucial for the stabilization of Eu3+ during the reduction step of synthesis.
|Journal series||Journal of Alloys and Compounds, ISSN 0925-8388, (A 35 pkt)|
|Publication size in sheets||0.5|
|Keywords in English||Eu2+/Eu3+ luminescence, charge compensation defects, strontium orthosilicate, defects migration|
|Score|| = 35.0, ArticleFromJournal|
= 35.0, ArticleFromJournal
|Publication indicators||: 2017 = 3.779 (2) - 2017=3.315 (5)|
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