The nature of luminescence of KI and KI-Na crystals at low temperature deformation after natural decrease in the symmetry of the lattice
Journal Title: Eurasian journal of physics and functional materials - Year 2018, Vol 2, Issue 3
Abstract
The X-ray luminescence spectra at low temperature (90K) uniaxial deformation were researched for KI and KI-Na crystals, that were stored for more than 10 years. The following regularities were observed: firstly, the intensities of the intrinsic emission bands at 3.3 eV ( p ) and 4.1 eV ( s ) become equal in com- parison with freshly grown crystals; and secondly, with an increase in the degree of low-temperature uniaxial deformation, a gradual shift of the emission spectra occurs in two directions: the luminescence maximum at 3.3 eV shifts towards short wavelengths, the final position is fixed at 3.9 eV, which prac- tically merges with s -luminescence; the radiation maximum at 3.0 eV (Ex-radiation) is shifted toward long wavelengths, the final position which is fixed at 2.8 eV. Thus, low temperature uniaxial deformation leads to the separation of the emission spectra at 3,3 eV( p ) → 3,9 eV and 3.0 eV ( Ex ) → 2,8 eV, which are interpreted by the separation of weak → on and weak → strong exciton configurations , respectively.
Authors and Affiliations
K. Shunkeyev, N. Zhanturina, L. Myasnikova, D. Sergeyev, Z. Aimaganbetova, Sh. Sagimbaeva, A. Barmina, Zh. Ubaev
Keywords
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- EP ID EP558817
- DOI 10.29317/ejpfm.2018020308
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