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Effect of Sr substitution on photoluminescent properties of BaAl2O4:Eu2+, Dy3+

✍ Scribed by H. Ryu; B.K. Singh; K.S. Bartwal

Publisher: Elsevier Science
Year: 2008
Tongue: English
Weight: 775 KB
Volume: 403
Category: Article
ISSN: 0921-4526
DOI: 10.1016/j.physb.2007.08.088

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✦ Synopsis

Phosphor material BaAl 2 O 4 :Eu 2+ , Dy 3+ with varying compositions of Sr substitution were prepared by the solid-state synthesis method. The phosphor compositions were characterized for their phase and crystallinity by XRD, SEM and TEM. Photoluminescence (PL) properties were investigated measuring PL and decay time for varying Ba/Sr compositions. The PL results show the blue shift in the luminescence properties in Sr substituted BaAl 2 O 4 :Eu 2+ , Dy 3+ compared to parent BaAl 2 O 4 :Eu 2+ , Dy 3+ . It is probably due to the influence of 5d electron states of Eu 2+ in the crystal field because of atomic size variation causing crystal defects. Dy 3+ ion doping in the phosphor generates deep traps, which results in long afterglow phosphorescence.

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