Optical Studies on Thallium-activated Alkali-iodide Crystals

概要

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Absorption and emission spectra of KI-Tl and NaI-Tl phosphors have been investigated at both room and liquid air temperatures. In order to perform optical measurements on NaI-Tl, special caution was given to prevent the crystal surface from being clouded by moisture. In the absorption spectra of NaI-Tl, new bands due to the presence of thallium were found. Their maximum absorption coefficients seemed to vary with the square of the thallium concentrations. The similar fact has already been found by Yuster and Delbecq in their investigation on KI-Tl. In emission, both KI and NaI crystals containing high concentrations of thallium showed a subsidiary band overlapping the short wavelength tail of the hitherto observed main band. The relations between these absorption and emission bands were investigated and discussions were given in terms of an extended model proposed by Seitz.
社団法人日本物理学会の論文
1959-10-05