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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Spectroscopic properties of Pr3+ ions in a PbWO4 single crystal
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Spectroscopic properties of Pr3+ ions in a PbWO4 single crystal

机译：PbWO4单晶中Pr3 +离子的光谱性质

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摘要

Site-selective fluorescence laser spectroscopy of Pr3+ ions in lead tungstate single crystal were investigated at temperatures from 10 to 300 K. The site-selective emission spectra and fluorescence decays from the (3)p(J) (J = 0, 1, 2) and D-1(2) states were analyzed. The (3)p(J) (J = 0, 1, 2) level shows its predominantly radioactive character with the typical greenish-blue luminescence ascribed to (3)p(J) transition. The emission from the D-1(2) level is only observed when this level is directly excited. The decay kinetic of the D-1(2) level was measured under site-selective excitation and discussed in terms of cross-relaxation. The up-conversion emission from levels P-3(1) and P-3(0) following excitation of the D-1(2) state was observed in the PbWO4 crystal between 10 and 300 K. The main up-conversion mechanism, together with the understanding the quenching of the D-1(2) fluorescence in this Pr3+ heavily doped PbWO4 were discussed. The presence of the complex structures of the emission spectra and different decay profiles indicate that several processes contribute to the quenching of the D-1(2) fluorescence of Pr3+ ions. It was found that the up-conversion fluorescence intensity had a quadratic dependence on the laser input power. The temporal behavior of the up converted emission indicates that an energy-transfer up-conversion is the dominant process.
机译：在10至300 K的温度下研究了钨酸铅单晶中Pr3 +离子的定点荧光激光光谱。（3）p（J）（J = 0，1，2 ）和D-1（2）状态进行了分析。 （3）p（J）（J = 0，1，2）能级显示出其主要的放射性特征，并且典型的蓝绿色发光归因于（3）p（J）跃迁。仅在直接激发D-1（2）能级时才能观察到该发射。 D-1（2）水平的衰减动力学是在定点激发条件下测量的，并根据交叉松弛进行了讨论。在10至300 K之间的PbWO4晶体中，观察到在激发D-1（2）状态之后从P-3（1）和P-3（0）能级上转换发射。主要上转换机理是连同对这种Pr3 +重掺杂PbWO4中D-1（2）荧光猝灭的理解进行了讨论。发射光谱的复杂结构和不同衰减曲线的存在表明，多个过程有助于Pr3 +离子的D-1（2）荧光猝灭。已经发现，上转换荧光强度对激光输入功率具有二次依赖性。上转换发射的时间行为表明能量转移上转换是主要过程。

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