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Photoluminescence Kinetics of YAG Crystals Activated with Ce, and Ce and Mg

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Barzowska J., Kubicki A., Grinberg M., Kaczmarek S., Łuczyński Z., Wojtowicz A., Koepke C.

vol. 95

issue 3

395-402

A basic spectroscopic measurements of luminescence, absorption, luminescence excitation spectra and emission kinetic measurements on YAG crystals activated with cerium and magnesium are presented. We report that the Ce^{3+} luminescence decay constant, at 65 ns, is independent of Ce concentrations (from 0.05 to 0.2%) and that it does not change with the presence or absence of the Mg co-dopant. Nevertheless, we find that under pulsed laser excitation at 290 nm the rise time in Ce luminescence time profiles is effectively shorter in the Mg co-doped samples.

Excited State Absorption and Thermoluminescence in Ce and Mg Doped Yttrium Aluminum Garnet

100%

Wiśniewski K., Koepke C., Wojtowicz A., Drozdowski W., Grinberg M., Kaczmarek S., Kisielewski J.

vol. 95

issue 3

403-412

In this paper we report preliminary results of optical studies on Y_{3}Al_{5}O_{12} (YAG) crystals codoped with Ce and Mg. By using measurements of luminescence, absorption, and luminescence excitation spectra we demonstrate that although the basic features introduced to the YAG host by the Ce-doping remain intact, the Mg-codoping imposes some significant changes on other properties of the material. These changes are potentially important for laser and/or scintillator applications of YAG:Ce and are due, most likely, to modifications of defect populations in the material. We characterize them by using the techniques of thermoluminescence and excited state absorption under excimer laser pumping. These techniques, interestingly, yield results that seem inconsistent. While the thermoluminescence signal of the Mg-doped sample is strongly reduced, suggesting that trap concentrations in the presence of Mg are suppressed, the excited state absorption signal, which we also relate to the traps, is higher. We offer a tentative explanation of this contradiction between the two experiments that involves a massive transfer of electrons from the Mg-related defects to the excited state absorption centers caused by the excimer pump itself.

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2 Acta Physica Polonica A

2 1999

2 Grinberg M.

2 Kaczmarek S.

2 Koepke C.

2 Wojtowicz A.

1 Barzowska J.

1 Drozdowski W.

1 Kisielewski J.

1 Kubicki A.

1 Wiśniewski K.

1 Łuczyński Z.

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Photoluminescence Kinetics of YAG Crystals Activated with Ce, and Ce and Mg

Excited State Absorption and Thermoluminescence in Ce and Mg Doped Yttrium Aluminum Garnet