Luminescence and decay kinetics of Pb2+ center in LiCaAlF6 single crystal host
Luminescence and decay kinetics of Pb2+ center in LiCaAlF6 single crystal host
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DOI：
10.1016/j.optmat.2009.04.005
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发表时间：
2009-09
影响因子：
3.9
通讯作者：
J. Pejchal;E. Mihóková;M. Nikl;A. Novoselov;A. Yoshikawa
中科院分区：
文献类型：
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作者：
J. Pejchal;E. Mihóková;M. Nikl;A. Novoselov;A. Yoshikawa
采用微下拉法生长了掺Pb的LiCaAlF 6单晶。研究了Pb ~（2+）发光中心激发态的动力学过程。一个简单的三能级唯象模型应用于衰变时间的温度依赖性表明，Pb 2+中心的亚稳态3 P0和辐射态3 P1之间的能量分离相对较高，约为180 meV（~ 1470 cm −1）。在500 K下UV照射后的诱导吸收光谱指向Pb 2+激发态的轻微电离和具有位于260 nm附近的吸收峰的颜色F-中心的产生。
The Pb-doped LiCaAlF6single crystals were grown using the micro-pulling-down method. The temperature dependences of photoluminescence characteristics were studied to reveal the kinetic processes in the excited state of Pb2+luminescence center. A simple three-level phenomenological model applied to the decay time temperature dependences shows that energy separation between the metastable3P0and the radiative3P1states of Pb2+center is relatively high, about 180meV (∼1470cm−1). Induced absorption spectrum after UV illumination at 500K points to slight ionization of the Pb2+excited state and creation of the color F-center with an absorption peak located around 260nm.