Preview

Eurasian Journal of Physics and Functional Materials

Advanced search

The nature of luminescence of KI and KI-Na crystals at low temperature deformation after natural decrease in the symmetry of the lattice

https://doi.org/10.29317/ejpfm.2018020308

Full Text:

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 (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.

About the Authors

K. .. Shunkeyev
K. Zhubanov Regional State University
Kazakhstan


N. .. Zhanturina
K. Zhubanov Regional State University
Kazakhstan


L. .. Myasnikova
K. Zhubanov Regional State University
Kazakhstan


D. .. Sergeyev
K. Zhubanov Regional State University
Kazakhstan


Z. .. Aimaganbetova
K. Zhubanov Regional State University
Kazakhstan


Sh. .. Sagimbaeva
K. Zhubanov Regional State University
Kazakhstan


A. .. Barmina
K. Zhubanov Regional State University
Kazakhstan


Zh. .. Ubaev
K. Zhubanov Regional State University
Kazakhstan


References

1. V. Babin et al., J. Luminescence. 81(1) (1999) 71.

2. V. Babin et al., J. Physics Condensed Matter. 11(10 A) (1999) 2303.

3. K. Shunkeev et al., J. Applied Spectroscopy 62(3) (1995) 533.

4. K. Shunkeev et. al., J. Applied Spectroscopy 74(1) (2007) 74.

5. K. Shunkeyev et. al., Fizika Nizkikh Temperatur 42(7) (2016) 738.

6. Lushchik Ch. and Lushchik A., Decay of Electronic Excitations with Defects Formation in Solids (Nauka, Moscow, 1989) 264 p. (In Russian)

7. K. Kanno et. al., Rev. of Sol. Stat. Scien. 4(2&3) (1990) 383.

8. K. Shunkeyev et. al., J. Physics: Conference Series 830 (2017) 012138.

9. K. Shunkeyev et. al., J. Physics: Conference Series 830 (2017) 012139.

10. R. Bernabei et. al., Int. J. Mod. Phys. 28 (2013) 130022.

11. C. Beck, Phys. Rev. Lett. 111 (2013) 1258.

12. K. Shunkeyev et. al., J. Physics: Conference Series 400 (2012) 052032.

13. Song K. and Williams R., Self-trapped excitons (Springer Verlag, Berlin, 1993) 404 p.

14. M. Ikezawa and T. Kojima, J. Phys. Soc. Japan. 27(6) (1969) 1551.

15. V. Babin et. al., J. Luminescence. 76&77 (1998) 502.

16. K. Shunkeyev et. al., Patent 2003/0937.1, published 08.07.03.

17. H. Nishimura et. al., J. Luminescence. 58 (1994) 347.


Review

For citations:


Shunkeyev K..., Zhanturina N..., Myasnikova L..., Sergeyev D..., Aimaganbetova Z..., Sagimbaeva S..., Barmina A..., Ubaev Z... The nature of luminescence of KI and KI-Na crystals at low temperature deformation after natural decrease in the symmetry of the lattice. Eurasian Journal of Physics and Functional Materials. 2018;2(3):267-273. https://doi.org/10.29317/ejpfm.2018020308

Views: 102


Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.


ISSN 2522-9869 (Print)
ISSN 2616-8537 (Online)