Efficient X-ray generation of Sm2+ in nanocrystalline BaFCl/Sm3+: a photoluminescent X-ray storage phosphor.
Efficient X-ray generation of relatively stable Sm2+ centers is observed in nanocrystalline Sm3+-activated BaFCl, as prepared by a one-step wet chemical reaction. The conversion efficiency is approximately 50,000 times higher than that in microcrystalline BaFCl/Sm3+ prepared at 900 degrees C. The Sm2+ centers, and hence the radiation dose, can be directly monitored by the narrow photoexcited 5DJ-7FJ f-f luminescence lines. The relatively high efficiency of Sm2+ generation appears to be directly linked to the particle size.
School of Physical, Environmental and Mathematical Sciences, The University of New South Wales, ADFA, Canberra ACT 2600, Australia. h.riesen@adfa.edu.au
Hans
H
Riesen
Wieslaw A
WA
Kaczmarek