Abstract

Luminescence intensity corresponding to Eu 3+ for SnO 2:Eu 3+ nanoparticles dispersed in Y 2O 3 increases significantly with increasing heat-treatment temperature up to 500 °C after excitation through exciton of SnO 2. On further heat-treatment up to 900 °C, luminescence intensity decreases, whereas lifetime value for 5D 0 level of Eu 3+ increases. This can be explained on formation of phases Y 2− x Eu x Sn 2O 7 and Y 2− y Eu y O 3 during heat-treatment. The former does not contribute to luminescence intensity, whereas the latter contributes to luminescence intensity. Availability of optically active Eu 3+ ions decreases with heat-treatment and hence, luminescence intensity decreases. Enhancement of lifetime is related to homogeneous solid solution formation of Y 2− y Eu y O 3 during heat-treatment.

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