Luminescence of calcium tungstate crystals
Luminescence of calcium tungstate crystals
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DOI：
10.1063/1.1681693
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发表时间：
1974-11
影响因子：
4.4
通讯作者：
M. Treadaway;R. Powell
中科院分区：
文献类型：
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作者：
M. Treadaway;R. Powell
荧光、激发和脉冲荧光测量已经在CaWO4单晶上进行了宽温度范围的测量。在不同的激发波长下，得到了积分荧光强度和寿命的温度依赖性。在75°K以下可以观察到荧光寿命的急剧增加，并且可以观察到零声子线。这些结果被用来建立一个基于WO42−离子在S4对称晶体场中的钨酸盐发光中心的模型。还讨论了能量迁移和杂质捕获效应。
Fluorescence, excitation, and pulsed fluorescence measurements have been made on a single crystal of CaWO4 over a wide temperature range. The temperature dependences of the integrated fluorescence intensities and lifetimes were obtained for different excitation wavelengths. A sharp increase in the fluorescence lifetimes is observed below about 75°K and zero‐phonon lines can be observed. These results are used to formulate a model for the tungstate luminescent center based on the WO42− ion in a crystal field of S4 symmetry. Energy migration and impurity trapping effects are also discussed.