GdBO_3∶Pr^(3+),Yb^(3+)中Pr^(3+)到Yb^(3+)的能量传递及发光性质

Luminescence Properties and Energy Transferfrom Pr^(3+) to Yb^(3+) in GdBO_3∶ Pr^(3+),Yb^(3+)

采用高温固相法制备了一系列单掺或双掺Pr3+和Yb3+的GdBO3材料,分别测试分析了材料的物相结构和发光性质。在446 nm蓝光(Pr3+:3H4→3P2)激发下,检测到Yb3+的近红外特征发射,表明样品中存在Pr3+到Yb3+的能量传递。Pr3+的掺杂浓度一定时,样品的发光会随着Yb3+掺杂浓度的改变而发生变化。通过对比不同掺杂情况下Pr3+:3P0能级的衰减曲线,发现随着Yb3+的掺杂浓度的增加,该能级的荧光寿命不断缩短;同时利用不同条件下的衰减特性计算得出不同Yb3+掺杂浓度样品的能量传递效率。用InokutiHirayama模型分析表明Pr3+-Yb3+能量传递类型为偶极子-偶极子相互作用。

GdBO3∶Pr3+ and GdBO3∶Pr3+, Yb3+ samples were prepared by solid state reaction at high temperature. XRD patterns, excitation spectra and emission spectra in the Vis-NIR range of the obtained samples were studied in detail at room temperature. The emission of 2 F5/2→2 F7/2 (980 nm) of Yb3+ was observed under 446 nm excitation, indicating the occurrence of the energy transfer from Pr3+ to Yb3+. The fluorescence intensities varied with different Yb3+doping concentrations. Lumi-nescence decay curves of Pr3+:3 P0 level were recorded as a function of the Yb3+ concentrations and energy transfer efficiency was also calculated. Based on Inokuti-Hirayama model, the energy transfer type from Pr3+ to Yb3+was derived to be electric dipole-dipole interaction.