Luminescence and scintillation properties of VUV scintillation crystals based on Lu-admixed BaY.sub.2./sub.F.sub.8./sub..

0389333 - FZÚ 2013 RIV US eng J - Článek v odborném periodiku
Pejchal, Jan - Fukuda, K. - Nikl, Martin - Kawaguchi, N. - Yokota, Y. - Yanagida, T. - Yoshikawa, A.
Luminescence and scintillation properties of VUV scintillation crystals based on Lu-admixed BaY₂F₈.
IEEE Transactions on Nuclear Science. Roč. 59, č. 5 (2012), s. 2177-2182. ISSN 0018-9499. E-ISSN 1558-1578
Grant ostatní: AV ČR(CZ) M100100910
Výzkumný záměr: CEZ:AV0Z10100521
Klíčová slova: fluorides * rare-earth doping * scintillator * x-ray and gamma-ray detection
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 1.219, rok: 2012

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 Tm 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 BaY2F8 single crystal reached nearly the same scintillation efficiency as the LaF3 :Nd 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.
Trvalý link: http://hdl.handle.net/11104/0218220