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

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Kaczmarek S., Moroz Z., Kwasny M., Kisielewski J., Lukasiewicz T., Wojtkowska J., Rzewuski H.

Acta Physica Polonica A

1999

vol. 95

issue 6

953-964

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.

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1 Acta Physica Polonica A

1 1999

1 Kaczmarek S.

1 Kisielewski J.

1 Kwasny M.

1 Lukasiewicz T.

1 Moroz Z.

1 Rzewuski H.

1 Wojtkowska J.

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