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Pejchal, Jan,Babin, Vladimir,Beitlerova, Alena,Kucerkova, Romana,Panek, Dalibor,Barta, Jan,Cuba, Vaclav,Yamaji, Akihiro,Kurosawa, Shunsuke,Mihokova, Eva,Ito, Akihiko,Goto, Takashi,Nikl, Martin,Yoshika Elsevier 2016 Optical Materials Vol.53 No.-
<P><B>Abstract</B></P> <P>Ce-doped lutetium aluminum garnet Lu<SUB>3</SUB>Al<SUB>5</SUB>O<SUB>12</SUB> (LuAG) nanoceramics were fabricated at 1600°C and 1700°C by spark-plasma sintering (SPS) method from nano-powders prepared by radiation synthesis. Both undoped and Ce-doped LuAG ceramic samples were also prepared from the nano-powders at 1700°C with significantly increased pre-heating rate. The backscattered electron images revealed large amount of pores in all the Ce-doped samples causing their significant opacity. On the other hand, very large grains and no pores were revealed in the undoped sample, which was the only transparent one. The radioluminescence measurements revealed superior overall scintillation efficiency of the samples sintered at the temperature 1700°C, and their defect emission in the UV region was ascribed to oxygen-vacancy-related defects such as F<SUP>+</SUP> centers. The photoluminescence decay of the defect emission was characterized by an extremely fast decay time of a few nanoseconds. Influence of sintering procedure and subsequent annealing on the luminescence and scintillation properties is discussed.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ce-doped scintillation nanoceramics were prepared by a Spark-Plasma-Sintering method. </LI> <LI> High overall scintillation efficiency was found. </LI> <LI> For samples prepared with slower pre-heating, scintillation efficiency can be increased by annealing. </LI> <LI> Higher sintering temperatures and slower pre-heating stages positively influence scintillation efficiency. </LI> </UL> </P>
Kamada, K.,Nikl, M.,Kurosawa, S.,Shoji, Y.,Pejchal, J.,Ohashi, Y.,Yokota, Y.,Yoshikawa, A. Elsevier [etc.] 2016 Journal of luminescence Vol.169 No.2
Pr doped (Lu,Gd)<SUB>3</SUB>(Ga,Al)<SUB>5</SUB>O<SUB>12</SUB> single crystals were grown by the micro-pulling down (μ-PD) method. The crystals were greenish and transparent with 3.0mm in diameter, 10-30mm in length. Neither visible inclusions nor cracks were observed. Luminescence and scintillation properties were measured. The substitution at the Al<SUP>3+</SUP> sites by Ga<SUP>3+</SUP> in garnet structure has been studied. The Pr<SUP>3+</SUP> 5d-4f emission is observed within 300-380nm wavelength superposed with 312nm emission line of Gd<SUP>3+</SUP>. Pr0.2%:Lu<SUB>2.5</SUB>Gd<SUB>1</SUB>Ga<SUB>3</SUB>Al<SUB>2</SUB>O<SUB>12</SUB> shows highest emission intensity. The light yield of Pr0.2%:Lu<SUB>2.5</SUB>Gd<SUB>0.5</SUB>Ga<SUB>2</SUB>Al<SUB>3</SUB>O<SUB>12</SUB> sample with diameter 3mmx1mm size was around 8000ph/MeV. Two-exponential approximations of scintillation decay showed 39.6ns (30.6%) and 151ns (69.4%) decay times.