| Autor: |
Birowosuto MD; Radiation Detection and Matter, Department of Applied Sciences, Delft University of Technology, Mekelweg 15, 2629 JB, Delft, The Netherlands., Dorenbos P, van Eijk CW, Krämer KW, Güdel HU |
| Jazyk: |
angličtina |
| Zdroj: |
Journal of physics. Condensed matter : an Institute of Physics journal [J Phys Condens Matter] 2006 Jul 05; Vol. 18 (26), pp. 6133-48. Date of Electronic Publication: 2006 Jun 19. |
| DOI: |
10.1088/0953-8984/18/26/031 |
| Abstrakt: |
We report the optical and scintillation properties of the Ce(3+)-doped bromoelpasolites Cs(2)NaREBr(6) (RE = La,Y,Lu). The γ-ray scintillation light yield of these materials varies from 6000 to 17 000 photons per MeV absorbed γ-ray energy. At room temperature (RT), the γ-ray scintillation decay curves for all compounds show a fast component of 61 ns, whereas the intrinsic Ce(3+) decay time is 30 ns. The scintillation mechanism in elpasolites is addressed. In Cs(2)NaLuBr(6):Ce(3+) and Cs(2)NaYBr(6):Ce(3+), we observe for the first time the so-called Ce(3+) anomalous emission in bromide compounds. This emission previously observed for chloride compounds is an ultrafast Ce(3+) emission with a selective excitation mechanism. The decay time of the anomalous emission at 10 K in bromide compounds (∼7.80 ns) is faster than that in chloride compounds (∼9.90 ns). Two bands of the anomalous emission are resolved for the first time. The mechanism behind this emission is discussed. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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