Effects of distorted lattice and nonequal-valvence substitution on the long lasting phosphorescence of Eu2+ and Gd3+ doped RMg2(PO4)2 (R=Sr,Ba) phosphors
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Medientyp:
E-Artikel
Titel:
Effects of distorted lattice and nonequal-valvence substitution on the long lasting phosphorescence of Eu2+ and Gd3+ doped RMg2(PO4)2 (R=Sr,Ba) phosphors
Beteiligte:
Liu, Liyan;
Pang, Ran;
Li, Chengyu;
Su, Qiang
Erschienen:
AIP Publishing, 2010
Erschienen in:
Journal of Applied Physics, 108 (2010) 4
Beschreibung:
<jats:p>The afterglow of Eu2+ activated SrMg2(PO4)2 can be greatly enhanced by the codoping of Gd3+, as well as an interesting phenomenon of the improvement of the efficiency of the excitation light. However, Eu2+ activated BaMg2(PO4)2 does not show the phosphorescence until the codoping of Gd3+. It is suggested that the codoping of Gd3+ improve the electron storage ability of material by acting as electron-trapping centers resulted from the nonequal-valence substitution of Gd3+ replacing Sr2+ and Ba3+. And the Gd3+-induced enhancement of the excitation efficiency of Eu and Gd codoped SrMg2(PO4)2 is due to the improvement of the energy transfer efficiency caused by the distortion of lattice of Gd3+ located at the sites of Sr2+.</jats:p>