Spectrally resolved thermally stimulated luminescence of irradiated anion-defective alumina single crystals
| Autor: | Ivo Romet, V. S. Kortov, D. Ananchenko, Vitali Nagirnyi, Aleksandr Lushchik |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Biophysics Analytical chemistry General Chemistry Atmospheric temperature range Condensed Matter Physics 01 natural sciences Biochemistry Atomic and Molecular Physics and Optics Spectral line 030218 nuclear medicine & medical imaging Ion 03 medical and health sciences 0302 clinical medicine Impurity 0103 physical sciences Emission spectrum Irradiation Luminescence Excitation |
| Zdroj: | Journal of Luminescence. 186:189-193 |
| ISSN: | 0022-2313 |
| DOI: | 10.1016/j.jlumin.2017.02.023 |
| Popis: | Thermally stimulated luminescence (TSL) spectra in the 313–580 K temperature range have been studied in anion-defective alumina crystals (named in literature as Al 2 O 3 :C) exposed to different irradiation doses. The TSL curve features two peaks with the maxima at T m1 =437 K and T m2 =565 K. The TSL spectrum of the first peak contains the emission of F centers and the R line of Cr 3+ impurity ions. The absence of the emission of F + centers indicates that electron traps are responsible for the first dosimetric TSL peak. The TSL spectrum of the second peak features emission bands of F, F + centers, R line as well as a wide band centered at 550 nm and associated with the formation of aggregate centers (F 2 and F 2 2+ ) under irradiation. Possible excitation mechanisms of the TSL emission bands that involve both electron and hole traps related to anion vacancies and impurities are discussed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect