Time resolved measurements of polarized luminescence from relaxed excitons due to I-dimers in KBr:I

The presence of a fast decay component (fluorescence) with a lifetime of τ ≈ 2 ns was confirmed in the dimer emission band (4.3 eV) in KBr:I, in addition to the phosphorescent component from the lowest triplet state. 3Σ + u, of the relaxed exciton [I 2-(V k )+e]. Time-resolved measurements using an...

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Bibliographic Details
Published in:Journal of luminescence 1987-12, Vol.38 (1), p.207-209
Main Authors: Tanaka, Kōichiro, Mukai, Takuya, Arimoto, Osamu, Kan'no, Ken-ichi, Nakai, Yoshio
Format: Article
Language:English
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Summary:The presence of a fast decay component (fluorescence) with a lifetime of τ ≈ 2 ns was confirmed in the dimer emission band (4.3 eV) in KBr:I, in addition to the phosphorescent component from the lowest triplet state. 3Σ + u, of the relaxed exciton [I 2-(V k )+e]. Time-resolved measurements using an ArF excimer laser (6.42 eV, 12 ns) revealed that the emission peak energy of the fluorescent component is higher than that of the phosphorescent component by only 50 meV. Under stimulation with linearly [110]-polarized light, clear anisotropy was induced in both components, indicating that dimer centers oriented along a specific [110] direction were excited preferentially. The degree of polarization of the phosphorescent component and that of the fluorescent component were both found to be positive for any azimuthal angle of the electric vector of the exciting light. The initial state of the fluorescent component is tentatively assigned to the lowest 1Σ + u state locating close to the 3Σ + u sta te.
ISSN:0022-2313
1872-7883
DOI:10.1016/0022-2313(87)90108-6