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1999 | 95 | 6 | 953-964
Article title

Changes in Luminescence of Ce:yag Crystals Under Ionizing Radiation Treatment

Content
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Languages of publication
EN
Abstracts
EN
Radiation induced changes in the luminescence spectrum under influence of UV light, γ-rays, electrons and protons for several concentrations of Ce^{3+} ions as well as Mg^{2+} ions in yttrium-aluminum garnet crystals were investigated. To irradiate with γ and electron as grown crystals were used while for proton irradiations the crystals were thermally annealed. For small concentrations of cerium ions (≈0.01 at.%) an increase in the luminescence (about 100%) was observed after gamma irradiation with a dose of 10^{5} Gy. This increase was due to the growth in Ce^{3+} ions concentration after γ-irradiation (≈50%), due to the Ce^{4+} → Ce^{3+} recharging reaction. For highly doped Ce:YAG crystals (0.1 at%, 0.2 at.%) also an increase, but much smaller (4%), for the Mg codoped crystals (0.1 at.%) was observed. After 1 MeV electron irradiation in the over-threshold type interaction a decrease in luminescence is observed due to the domination of the Ce^{3+} → Ce^{4+} ionization process. In the case of the proton irradiation, for small fluencies (≈10^{13} particles/cm^{2}) an increase in luminescence is observed due to the domination of the recharging processes of Ce^{4+} ions. For larger fluencies (>10^{14} particles/cm^{2}) a decrease takes place due to a high level of radiation defects.
Keywords
EN
Year
Volume
95
Issue
6
Pages
953-964
Physical description
Dates
published
1999-06
received
1998-07-27
(unknown)
1999-02-19
References
Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv95z608kz
Identifiers
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