Luminescence of bound excitons created near sodium impurity ions in KCl:Na single crystals
The study is focused on luminescence features of bound excitons (exciton-like formations, ELFs) in KCl:Na single crystals created in the field of sodium impurity ions either directly at photoexcitation or via the recombination of electron-hole pairs. The intensity of the X-ray luminescence (XRL) ban...
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| Format: | Article |
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Elsevier
2025-02-01
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| Series: | Optical Materials: X |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590147824001074 |
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| author | K. Shunkeyev А. Kenzhebayeva A. Krasnikov V. Nagirnyi Sh Sagimbayeva D. Sergeyev А. Tilep Zh Ubaev A. Lushchik |
| author_facet | K. Shunkeyev А. Kenzhebayeva A. Krasnikov V. Nagirnyi Sh Sagimbayeva D. Sergeyev А. Tilep Zh Ubaev A. Lushchik |
| author_sort | K. Shunkeyev |
| collection | DOAJ |
| description | The study is focused on luminescence features of bound excitons (exciton-like formations, ELFs) in KCl:Na single crystals created in the field of sodium impurity ions either directly at photoexcitation or via the recombination of electron-hole pairs. The intensity of the X-ray luminescence (XRL) bands peaked at 2.8 and 3.1 eV (emission of recombinationally formed and relaxed ELFs) increases with both, the concentration of sodium impurity ions (10 → 1000 ppm) and the detection temperature (85 → 350 K). It is worth noting that at room temperature, the light yield of these XRL bands in KCl:Na practically coincides with that for the luminescence measured in the same way in classical scintillators, CsI and CsI:Na crystals. The lifetime of the fast component of cathodoluminescence at 2.8 and 3.1 eV equals 2.4 and 1.7 ns, respectively, at 6 K and even shortens to approximately τ ≈ 0.3 ns at room temperature. At 10 K, photons of 7.6 and 6.7 eV directly form ELFs in the field of single or paired Na+ impurity ions with typical luminescence bands peaked, respectively, at 2.8 eV (el0 (Na+)) and 3.1 eV (el0 (Na+-Na+)). These photoluminescence bands undergo complete thermal quenching by 200–300 K, whereas relevant XRL bands are not quenched up to 350 K, their intensity even noticeably increases at 200 → 350 K. |
| format | Article |
| id | doaj-art-f48afab5af574fcc9b8565415bba28c0 |
| institution | Kabale University |
| issn | 2590-1478 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Optical Materials: X |
| spelling | doaj-art-f48afab5af574fcc9b8565415bba28c02025-02-08T05:01:04ZengElsevierOptical Materials: X2590-14782025-02-0125100395Luminescence of bound excitons created near sodium impurity ions in KCl:Na single crystalsK. Shunkeyev0А. Kenzhebayeva1A. Krasnikov2V. Nagirnyi3Sh Sagimbayeva4D. Sergeyev5А. Tilep6Zh Ubaev7A. Lushchik8K. Zhubanov Aktobe Regional University, 34 A. Moldagulova Ave., 030000, Aktobe, KazakhstanK. Zhubanov Aktobe Regional University, 34 A. Moldagulova Ave., 030000, Aktobe, KazakhstanInstitute of Physics, University of Tartu, 1 W. Ostwald Str., 50411, Tartu, EstoniaInstitute of Physics, University of Tartu, 1 W. Ostwald Str., 50411, Tartu, EstoniaK. Zhubanov Aktobe Regional University, 34 A. Moldagulova Ave., 030000, Aktobe, Kazakhstan; Corresponding author.K. Zhubanov Aktobe Regional University, 34 A. Moldagulova Ave., 030000, Aktobe, KazakhstanK. Zhubanov Aktobe Regional University, 34 A. Moldagulova Ave., 030000, Aktobe, KazakhstanK. Zhubanov Aktobe Regional University, 34 A. Moldagulova Ave., 030000, Aktobe, KazakhstanInstitute of Physics, University of Tartu, 1 W. Ostwald Str., 50411, Tartu, EstoniaThe study is focused on luminescence features of bound excitons (exciton-like formations, ELFs) in KCl:Na single crystals created in the field of sodium impurity ions either directly at photoexcitation or via the recombination of electron-hole pairs. The intensity of the X-ray luminescence (XRL) bands peaked at 2.8 and 3.1 eV (emission of recombinationally formed and relaxed ELFs) increases with both, the concentration of sodium impurity ions (10 → 1000 ppm) and the detection temperature (85 → 350 K). It is worth noting that at room temperature, the light yield of these XRL bands in KCl:Na practically coincides with that for the luminescence measured in the same way in classical scintillators, CsI and CsI:Na crystals. The lifetime of the fast component of cathodoluminescence at 2.8 and 3.1 eV equals 2.4 and 1.7 ns, respectively, at 6 K and even shortens to approximately τ ≈ 0.3 ns at room temperature. At 10 K, photons of 7.6 and 6.7 eV directly form ELFs in the field of single or paired Na+ impurity ions with typical luminescence bands peaked, respectively, at 2.8 eV (el0 (Na+)) and 3.1 eV (el0 (Na+-Na+)). These photoluminescence bands undergo complete thermal quenching by 200–300 K, whereas relevant XRL bands are not quenched up to 350 K, their intensity even noticeably increases at 200 → 350 K.http://www.sciencedirect.com/science/article/pii/S2590147824001074 |
| spellingShingle | K. Shunkeyev А. Kenzhebayeva A. Krasnikov V. Nagirnyi Sh Sagimbayeva D. Sergeyev А. Tilep Zh Ubaev A. Lushchik Luminescence of bound excitons created near sodium impurity ions in KCl:Na single crystals Optical Materials: X |
| title | Luminescence of bound excitons created near sodium impurity ions in KCl:Na single crystals |
| title_full | Luminescence of bound excitons created near sodium impurity ions in KCl:Na single crystals |
| title_fullStr | Luminescence of bound excitons created near sodium impurity ions in KCl:Na single crystals |
| title_full_unstemmed | Luminescence of bound excitons created near sodium impurity ions in KCl:Na single crystals |
| title_short | Luminescence of bound excitons created near sodium impurity ions in KCl:Na single crystals |
| title_sort | luminescence of bound excitons created near sodium impurity ions in kcl na single crystals |
| url | http://www.sciencedirect.com/science/article/pii/S2590147824001074 |
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