Photoconductivity of Alkali Halide Crystals Containing U Center

概要

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Temperature dependence and spectral distribution of photoconductivity in the ultraviolet region of KCl, KBr and NaCl crystals containing U centers have been investigated in the temperature range between room and liquid nitrogen temperatures. The optical absorption spectra of these crystals have also been measured. Two absorption bands are resolved in the shorter wavelength tail of the U band and they are attributed to the transitions to higher excited states of the U center. The spectral distribution of photoconductivity shows maxima at these band peaks. The nature of photocurrent is primary at the temperature range of 190°K-110°K for KCl, 170°K-100°K for KBr and 170°K-90°K for NaCl crystals, respectively, and above and below these temperature ranges the secondary photocurrent appears. The energy gaps between the conduction band and higher excited states of the U center are determined.
社団法人日本物理学会の論文
1963-10-05