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- Title
A single crystal of YALO<sub>3</sub>: Ce<sup>3+</sup> as a fast scintillator in SEM.
- Authors
Autrata, R.; Schauer, P.; Kvapil, Jiři; Kvapil, Josef
- Abstract
A new single-crystal scintillator intended for applications in a scanning electron microscope (SEM) is presented. It is a single-crystal disc of yttrium aluminium perovskite activated by trivalent cerium free of traces of Fe ions. The single crystals of YAlO3: Ce3+ (YAP: Ce3+) were prepared by the Czochralski method in a reducing atmosphere of Ar and H2 with an excess amount of Y3+ ions. Effective methods of purification and purity control of the raw material are described. The highest achievable concentration of Ce3+ ions in as grown crystals amounted to 0.3 wt%, concentration in the melt was 8-9 times higher. The best properties were found with samples of the maximum possible concentration of Ce3+. Compared with the previous aluminate Y3 Al5 O12: Ce3+ (YAG: Ce3+) these samples showed higher efficiency, a shorter decay time of luminescence (40 ns) and an emission band in a more advantageous spectral region (378 nm). Because of high resistance to radiation damage, high chemical resistance and applicability to ultra-high vacuum it is also suitable for detection of other kinds of ionizing radiation.
- Publication
Scanning, 1983, Vol 5, Issue 2, p91
- ISSN
0161-0457
- Publication type
Article
- DOI
10.1002/sca.4950050204