Improved cathodoluminescence performance of Mg-doped LuAG:Ce(GdGa) single crystalline films

0481925 - ÚPT 2018 FR eng A - Abstract
Lalinský, Ondřej - Schauer, Petr - Lučeničová, Z. - Kučera, M.
Improved cathodoluminescence performance of Mg-doped LuAG:Ce(GdGa) single crystalline films.
SCINT 2017. 14th International Conference on Stintillating Materials and their Applications. Book of Abstracts. Chamonix: CERN, 2017.
[SCINT 2017. International Conference on Stintillating Materials and their Applications /14./. 18.10.2017-22.10.2017, Chamonix]
R&D Projects: GA ČR(CZ) GA16-05631S; GA MŠMT(CZ) LO1212; GA MŠMT ED0017/01/01
Institutional support: RVO:68081731
Keywords : cathodoluminescence * single crystalline films
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
https://indico.cern.ch/event/388511/contributions/2611746/

Cerium activated lutetium aluminum garnet (LuAG:Ce) is a perspective material for applications in detection of X-rays, gamma radiation or high energy particles. However, the luminescence response of LuAG:Ce suffers from structural defects (mainly anti-site defects) that create unwanted slow microsecond-component in decay characteristics. Concentration of these defects decreases with decreasing growth temperature. Therefore, single-crystalline films grown by liquid phase epitaxy have recently attracted a lot of attention because their growth temperature is about half of that of the bulk single crystals grown by the Czochralski method. As shown earlier, the proper admixture of Gd and Ga into the garnet structure eliminates the effect of remaining anti-site defects and thus resulting in almost complete suppression of the slow decay component. In addition, such material has exceptionally high light yield (LY) exceeding 50 kph/MeV and its cathodoluminescence (CL) decay is dominated by a fast component with decay time of 50-80 ns. However, this decay time can be still too high, for example, for some special SEM applications where very fast e-beam scanning is required. Thus, new materials with faster decay have to be found. Recently, Mg 2+ -doped garnet films have been intensively studied, primarily using photoluminescence and radioluminescence but X-rays have high penetration depth in garnets. Consequently, unwanted substrate information is also recorded. The CL solves this problem because electrons having energy of 10 keV don’t penetrate deeper than 1 µm under the surface. Therefore, CL was selected as the optimal tool for specimen characterization.
Permanent Link: http://hdl.handle.net/11104/0277372