Optical Properties of the Thallous Ion Center in Sodium Iodide-Thallium Crystals

概要

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The absorption, excitation, and emission spectra of the thallous ion centers in sodium iodide-thallium crystals were measured at 30°K, 77°K, and at room temperature. In particular, the nature of the double thallous ion center was investigated in comparison with the single thallous ion center. The double thallous ion center has two processes of exciting luminescence, 305 mμ absorption band leading 325 mμ emission band, and 310 mμ absorption leading 425 mμ emission. The 425 mμ emission band is also excited by the 291 mμ absorption band of the single thallous ion center. For two types of emission bands appearing at 425 mμ, their half-widths are different both in magnitude and temperature dependence. This suggests that they are induced either by single or double thallous ion center. The polarized luminescence from the crystal excited by a certain linearly polarized light was examined in order to consider the model of the double thallous ion center.
社団法人日本物理学会の論文
1967-03-05