Luminescence of Eu²⁺ and Eu²⁺-Mn²⁺ in sodium scandium diphosphate NaScP₂O₇ crystal

张新民^1,2，郑薇¹，张宏志¹，陈翠丽³，徐孝镇³

1. School of Materials Science and Engineering, Central South University of Forestry and Technology3. Department of Physics and Interdisciplinary Program of Biomedical, Mechanical & Electrical Engineering, Pukyong National University

摘 要：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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