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Автор N Subramanian
Автор R Kesavamoorthy
Автор K Govinda Rajan
Автор Mohammad Yousuf
Автор Santanu Bera
Автор S V Narasimhan
Дата выпуска 1997-06-02
dc.description The results of x-ray excited optical luminescence (XEOL), photoluminescence (PL), photostimulated luminescence (PSL) and x-ray photoemission spectroscopy (XPS) studies on the x-ray storage phosphor BaFBr:Eu are presented in this paper. Analyses of XEOL, PL and PSL spectra reveal features corresponding to the transitions from to configurations in different site symmetries of . Increasing x-ray dose is seen to lead to a red shift in the maximum of the PL excitation spectrum for the 391 nm emission. The XEOL and XPS spectra do not show any signature of in the samples studied by us, directly raising doubts about the model of Takahashi et al in which is expected to ionize to upon x-ray irradiation and remain stable until photostimulation. XEOL and PSL experiments with simultaneous x-ray irradiation and He - Ne laser excitation as well as those with sequential x-ray irradiation and laser stimulation bring out the competition between the F centre population and depopulation rates. A time scale - 2 s, possibly related to the process of production of the electron/hole traps themselves, during x-ray irradiation, is observed. Relaxation of these traps upon photostimulation is also seen.
Формат application.pdf
Издатель Institute of Physics Publishing
Название X-ray excited optical luminescence, photoluminescence, photostimulated luminescence and x-ray photoemission spectroscopy studies on BaFBr:Eu
Тип paper
DOI 10.1088/0953-8984/9/22/027
Electronic ISSN 1361-648X
Print ISSN 0953-8984
Журнал Journal of Physics: Condensed Matter
Том 9
Первая страница 4769
Последняя страница 4780
Выпуск 22

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