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Luminescence and Scintillation Properties of VUV Scintillation Crystals Based on Lu-Admixed BaY _{2} F _{8}

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7 Author(s)
Pejchal, J. ; Inst. for Mater. Res., Tohoku Univ., Sendai, Japan ; Fukuda, K. ; Nikl, M. ; Kawaguchi, N.
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Nd and Tm-doped Lu-admixed BaY2F8 crystals were grown by micro-pulling-down method. Lu was added to modify the host matrix to suppress the unwanted energy transfer from exciton levels to the Tm3+ 4f-levels. It was found that low Tm and Nd codoping does not bring much improvement of the scintillation performance and that 1%Nd-doped BaY0.8Lu1.2F8 single crystal reached nearly the same scintillation efficiency as the LaF3:Nd8% one, which is known as a suitable candidate for a VUV scintillator. It is clear there is a considerable room for an optimization of this material by changing the Lu/Y ratio and increasing the content of Nd. On the other hand, very high Tm concentrations (around 20%) suppress the excitonic emission (and also the 4f-4f emission) while increasing the 5d-4f one significantly.

Published in:

Nuclear Science, IEEE Transactions on  (Volume:59 ,  Issue: 5 )

Date of Publication:

Oct. 2012

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