The nature of luminescence of KI and KI-Na crystals at low temperature deformation after natural decrease in the symmetry of the lattice
| Autor: | K. .. Shunkeyev, N. .. Zhanturina, L. .. Myasnikova, D. .. Sergeyev, Z. .. Aimaganbetova, Sh. .. Sagimbaeva, A. .. Barmina, Zh. .. Ubaev |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Eurasian Journal of Physics and Functional Materials, Vol 2, Iss 3, Pp 267-273 (2021) |
| Druh dokumentu: | article |
| ISSN: | 2522-9869 2616-8537 |
| DOI: | 10.29317/ejpfm.2018020308 |
| Popis: | 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 (π) and 4.1 eV ( σ ) 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 σ-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(π) → 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. |
| Databáze: | Directory of Open Access Journals |
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