Speaker
Dr
Ashot Petrosyan
(Institute for Physical Research, 378410 Ashtarak-2, Armenia)
Description
Optical properties (absorption in UV, slope of the optical edge, transmission and
color centers induced by UV-light or intentional doping) of LuAP:Ce, LuAP:Hf and
LuAP:(Ce, Hf) crystals were studied to establish compositions leading to the
smallest absorption at 260 nm and the highest transparency in the range of emission.
A low underlying absorption attained in Bridgman LuAP:Ce crystals enabled to follow
fine variations induced by Hf, when taken even in trace (20 ppm) amounts. Optical
observation of the trap ensemble modification evidenced by absorption intensity
redistribution over different color centers (which is strongly dependent on Hf
concentration) is discussed in terms of possible action of Hf4+ ions in the
perovskite lattice. The results of scintillation studies of LuAP:(Ce, Hf), in
comparison to LuAP:Ce, will include measurements of the light yield, decay time
constants and other basic parameters. In addition, as part of a continuing study on
spectroscopic properties of LuAP, including the red luminescence, the results of
characterization of single crystals grown from extremely pure oxides (both lutetium
and aluminum) will be presented.
Authors
Dr
Ashot Petrosyan
(Institute for Physical Research, 378410 Ashtarak-2, Armenia)
Dr
Christian Pedrini
(LPCML UMR CNRS 5620, University Lyon1, 69622 Villeurbanne, France)
Dr
Paul Lecoq
(CERN, 1211 Geneva 23, Switzerland)
Co-authors
Christophe Dujardin
(LPCML UMR CNRS 5620, University Lyon1, 69622 Villeurbanne, France)
Etiennette Auffray
(CERN, 1211 Geneva 23, Switzerland)
Irina Kamenskikh
(Department of Physics, M.V.Lomonosov Moscow State University, 119899 Moscow, Russia)
Julia Trummer
(CERN, 1211 Geneva 23, Switzerland)
Karine Ovanesyan
(Institute for Physical Research, 378410 Ashtarak-2, Armenia)
Marina Derdzyan
(Institute for Physical Research, 378410 Ashtarak-2, Armenia)
Tat'yana Butaeva
(Institute for Physical Research, 378410 Ashtarak-2, Armenia)
