Optical Absorption of Localized Excitons in Cadmium Halide Crystals

概要

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Optical absorption spectra of CdBr_2:I, CdCl_2:I and CdCl_2:Br have been measured at temperatures from 10 to 500K. In every system, well-defined absorption bands due to doped halogen ions were observed on the low energy sides of intrinsic absorption edges of host crystals. Shapes of these bands are Gaussian around the band maxima and follow Urbach's rule in the low energy tail regions. These absorption can be attributed to the creation of excitons localized at doped halogen ions. Effective energies of lattice vibrations related to the central Gaussian part and the exponential tail part are estimated from the measured temperature dependence of half-widths and of Urbach's tails, respectively. Temperature dependence of these of these bands will be discussed using the Franck-Condon model and modified Urbach's rule.
社団法人日本物理学会の論文
1976-05-15