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Luminescence and Transient Absorption of CdWO_{4} Crystals

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Millers D., Grigorjeva L., Chernov S.

Acta Physica Polonica A

1999

vol. 95

issue 6

965-969

Luminescence and transient absorption of the oxygen-deficient CdWO_{4} crystal were studied. The electron transitions from the excited state of the luminescence center to some higher energy state are responsible for the transient absorption observed. The scheme of luminescence center levels is proposed from the obtained experimental results.

The Model for Luminescence Center Excitation in PbWO_{4}

100%

Millers D., Grigorjeva L., Chernov S., Pankratov V.

Acta Physica Polonica A

1999

vol. 95

issue 6

971-976

The luminescence and transient absorption of PbWO_{4} crystals were studied. The electron beam (10 ns, E≈270 keV) was used as excitation source. The kinetics of luminescence is complicated - the prompt rise of luminescence intensity is followed by a slow (τ_{r}≈100 ns) rise. The luminescence decay at 80 K is nearly exponential with τ_{d}≈4.0- 4.5 μs. The decay kinetics of transient absorption at 3.5 eV can be described roughly by two exponents with time constants τ_{1}≈100 ns and τ_{2}≈4.0 μs. A common process responsible for absorption relaxation and luminescence rise is suggested. The luminescence center excitation occurs during recombination process via Pb^{2+} excited state formation and subsequent energy transfer to WO_{4}^{2-} group.

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2 Acta Physica Polonica A

2 1999

2 Chernov S.

2 Grigorjeva L.

2 Millers D.

1 Pankratov V.

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Luminescence and Transient Absorption of CdWO_{4} Crystals

The Model for Luminescence Center Excitation in PbWO_{4}