Abstract
In this work, the photoluminescence (PL) of NaScP2O7:Eu2+ and NaScP2O7:Eu2+,Mn2+ was investigated. Phase purity was checked using X-ray powder diffractometry (XRD). PL excitation and emission spectra were recorded to elucidate the PL properties of NaScP2O7:Eu2+ and NaScP2O7:Eu2+,Mn2+. Furthermore, fluorescence lifetime measurements were performed. PL and lifetime measurements were carried out from 10 to 525 K. Moreover, the Eu2+ site occupation was discussed. It turned out that the incorporated Eu2+ ions substituted for Na+ site and occupied two different sites. Temperature dependent PL measurements indicated the emission intensity decreased with increasing temperature due to temperature quenching in NaScP2O7:Eu2+. Fluorescence lifetimes of Eu2+ in NaScP2O7:Eu2+ almost did not change with a decay constant τ=∼0.53 μs in the temperature range of 10–280 K, and then shortened due to temperature quenching. The luminescent lifetime reached ∼0.05 μs at T=525 K. Finally, it was found that energy transfer occurred from Eu2+ to Mn2+ in co-doped NaScP2O7:Eu2+,Mn2+.
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