Optimization of decay kinetics of YAG:Ce single crystal scintillators for S(T)EM electron detectors

0366953 - ÚPT 2012 RIV NL eng J - Journal Article
Schauer, Petr
Optimization of decay kinetics of YAG:Ce single crystal scintillators for S(T)EM electron detectors.
Nuclear Instruments & Methods in Physics Research Section B. Roč. 269, č. 21 (2011), s. 2572-2577. ISSN 0168-583X. E-ISSN 1872-9584
R&D Projects: GA ČR GAP102/10/1410
Institutional research plan: CEZ:AV0Z20650511
Keywords : scintillation detector * electron microscope * cathodoluminescence * YAG:Ce single crystal scintillator * decay time * afterglow * kinetic model * SEM * STEM
Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering
Impact factor: 1.211, year: 2011

To enhance the detective quantum efficiency (DQE) of scintillation electron detectors for scanning electron microscopes or scanning transmission electron microscopes (S(T)EM), the cathodoluminescence (CL) decay kinetics of YAG:Ce single crystal scintillators is studied in this paper. Some possibilities for reductions of decay time and afterglow of the mentioned scintillators are presented. The pulse mode utilizing a blanking system and 10 keV electrons for the excitation and a sampling oscilloscope for the CL detection were used for the measurement of decay characteristics. The CL decay characteristics of YAG:Ce single crystals of different Ce concentrations, pulled by the Czochralski method and cleaned and annealed under specific conditions, were measured in dependence on excitation pulse duration and on the specimen temperature. To interpret the presented results, a kinetic model of cathodoluminescence of the YAG:Ce single crystals was created.
Permanent Link: http://hdl.handle.net/11104/0201766