Luminescence of Eu~(2+) and Eu~(2+)-Mn~(2+) in sodium scandium diphosphate NaScP_2O_7 crystal

• 作 者: 张新民 郑薇 张宏志 陈翠丽 徐孝镇
• 机 构: School of Materials Science and Engineering, Central South University of Forestry and Technology,Hun
• 出 处: Journal of Rare Earths
• 发表日期: 2017年05期
• 关键词: lifetime diphosphate diffractometry luminescent decay elucidate checked excitati

In this work, the photoluminescence(PL) of NaScP_2O_7:Eu~(2+) and NaScP_2O_7:Eu~(2+),Mn~(2+) 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 NaScP_2O_7:Eu~(2+) and NaScP_2O_7:Eu~(2+),Mn~(2+). Furthermore, fluorescence lifetime measurements were performed. PL and lifetime measurements were carried out from 10 to 525 K. Moreover, the Eu~(2+) site occupation was discussed. It turned out that the incorporated Eu~(2+) 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 NaScP_2O_7:Eu~(2+). Fluorescence lifetimes of Eu~(2+) in NaScP_2O_7:Eu~(2+) 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 Eu~(2+) to Mn~(2+) in co-doped NaScP_2O_7:Eu~(2+),Mn~(2+).

In this work, the photoluminescence (PL) of NaScP 2 O 7: Eu 2+ and NaScP 2 O 7: Eu 2+, Mn 2+ was investigated. . PL excitation and emission spectra were recorded to elucidate the PL properties of NaScP_2O_7: Eu ~ (2+) and NaScP_2O_7: Eu ~ (2 +), Mn ~ (2+) measurements were carried out from 10 to 525 K. Moreover, the Eu ~ (2+) site occupation was discussed. It turned out that the incorporated Eu ~ (2+) 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 NaScP_2O_7: Eu ~ (2) Fluorescence lifetimes of Eu ~ (2+) in NaScP_2O_7: Eu ~ (2+) 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 the energy transfer occurred from Eu ~ (2+) to Mn ~ (2+) in co-doped NaScP_2O_7: Eu ~ (2 +), Mn ~ (2+).