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Synchrotron radiation investigations of the Sr_2MgSi_2O_7:Eu^(2+),R^(3+) persistent luminescence materials 被引量:5
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作者 tuomas aitasalo Jukka Hassinen +5 位作者 Jorma Hls Taneli Laamanen Mika Lastusaari Marja Malkamki Janne Niittykoski Pavel Novák 《Journal of Rare Earths》 SCIE EI CAS CSCD 2009年第4期529-538,共10页
The electronic and defect energy level structure of polyerystalline Sr2MgSi2OT:Eu^2+,R^3+ persistent luminescence materials were studied with thermoluminescence and different synchrotron radiation spectroscopies (... The electronic and defect energy level structure of polyerystalline Sr2MgSi2OT:Eu^2+,R^3+ persistent luminescence materials were studied with thermoluminescence and different synchrotron radiation spectroscopies (UV-VUV emission and excitation, X-ray absorption near-edge spectroscopy (XANES) and extended X-ray absorption f'me structure (EXAFS)). Special attention was paid on the effect of the R3+ co-dopants on the persistent luminescence properties of the materials. Theoretical calculations using the density functional theory (DFT) were carried out simultaneously with the experimental work. The experimental band gap energy (Eg) value of ca. 7.1 eV agreed very well with the DFT value of 6.7 eV. The variation of the Eg value was attempted to relate with the trap structure as well as with the different properties of the R3+ co-dopants. The trap level energy distribution depended strongly on the R3+ co-dopant except for the shallowest trap energy above the room temperature remaining practically the same, however. The different processes in the mechanism of persistent luminescence from Sr2MgSi2OT:Eu^2+,R^3+ were assembled and their contributions discussed. 展开更多
关键词 strontium magnesium disilicate EUROPIUM persistent luminescence synchrotron radiation THERMOLUMINESCENCE mechanism rare earths
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