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首页> 外文期刊>Optical Materials >Energy transfer and upconversion of Sm3+ ions in YAlO3
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Energy transfer and upconversion of Sm3+ ions in YAlO3

机译：YAlO3中Sm3 +离子的能量转移和上转换

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摘要

Sm3+ doped YAlO3 (YAP) single crystals were prepared by the micro-pulling down method. Emission spectra as well as luminescence decay curves for these crystals were recorded at temperatures ranging from 10 K to 300 K. Based on the low temperature spectra the energies of the Stark levels for several multiplets were determined. The fluorescence decay curves have been measured as a function of concentration and temperature and are found to exhibit single exponential nature at lowest concentration of 0.1 at% but are strongly non-exponential at concentrations above 1 at.%. This concentration quenching of the Sm3+ ion emission was ascribed to resonant cross-relaxation. The non-exponential decay rates were successfully fitted to Inokuti-Hirayama model for s = 6 indicating that the nature of the energy transfer process among the Sm3+ ions is of electric dipole-dipole type. Cross-relaxation rates were experimentally determined as a function of activator concentration and used to evaluate and to model the decays. The critical distances and energy transfer microparameter for the transfer processes were given.
机译：采用微拉法制备了Sm3 +掺杂的YAlO3（YAP）单晶。在10 K至300 K的温度范围内，记录了这些晶体的发射光谱和发光衰减曲线。基于低温光谱，确定了多个多重峰的Stark能级能量。已经测量了荧光衰减曲线，该曲线是浓度和温度的函数，发现在最低浓度为0.1 at％时显示出单指数性质，但在浓度高于1 at％时却表现出强烈的非指数性质。 Sm3 +离子发射的这种浓度猝灭归因于共振交叉弛豫。 s = 6的非指数衰减率已成功拟合到Inokuti-Hirayama模型，表明Sm3 +离子之间的能量转移过程具有电偶极-偶极类型。交叉松弛率是根据激活剂浓度的函数实验确定的，并用于评估和建模衰减。给出了转移过程的临界距离和能量转移的微观参数。

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