Prog. Theor. Phys. Supplement No.12 (1959) pp. 141-159
Luminescence of Localized Excitons and Exciton Induced Luminescence in Alkali Halides
Institute of Polytechnics, Osaka City University, Osaka
Two experiments were carried out concerning excitons in KI. Luminescences from localized I- ions in KBr/KI mixed crystals were measured (Part I). They suffer from Stokes shift and are observed even in the case of concentration of 8.5 ×10-1 mol of KI in KBr. At the same time, energies of localized excitons around I- ions are transferred to some impurities in cases of such high concentrations of I- ions. In Part II, exciton induced luminescences from Tl+ ions in KI/TlI are described. Their yields are almost independent of concentrations of Tl+ ions, which fact suggests the migration of excitons in KI. The induced luminescence shows temperature-dependence. The natures of the exciton are discussed on the basis of these results.
DOI : 10.1143/PTPS.12.141
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