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SrS:Eu and CaS:Eu Thin Films: Influence of Host Lattice on Kinetics of Europium Emission

100%
Świątek K., Godlewski M., Niinistö L., Leskelä M.
Acta Physica Polonica A
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1992
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vol. 82
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issue 5
769-772
EN
In this paper we report the studies of photoluminescent properties of CaS:Eu and SrS:Eu thin films containing up to 3 mole % of Eu, grown by the atomic layer epitaxy method. The energy transfer and direct intrashell excitation channels of Eu ions are examined in function of temperature.
2
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On the Nature of Eu-Related Emissions in ZnS and CaS

100%
Świątek K., Godlewski M., Niinistö L., Leskelä M.
Acta Physica Polonica A
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1991
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vol. 79
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issue 2-3
255-257
EN
The Eu-connected recombination processes in ZnS and CaS are analyzed on the basis of optical studies. A new Eu-related emission in ZnS is attributed to the recombination of an exciton bound at the Eu^{2+} center, while in CaS the emission is dominated by the direct Eu^{2+} intra-ion transition.
3
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Rare-Earth Excitation Mechanism in Wide Band Gap H-VI Compounds

88%
Karpińska K., Świątek K., Godlewski M., Niinistö L., Leskelä M.
Acta Physica Polonica A
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1993
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vol. 84
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issue 5
959-962
EN
The excitation mechanism of rare-earth emission in Eu and Ce doped CaS and SrS is studied. It is proposed that the Eu and probably also Ce emission is induced by the photoionization transition of the rare-earth ion, which is followed by the carrier trapping via the excited state of the ion. At increased temperatures the efficiency of excitation is reduced. We explain this effect by the carrier emission from the excited core state of the rare-earth ion to the continuum of the conduction (valence) band states. It is also suggested that the charge transfer state of the rare-earth ion may act as the intermediate state in the carrier trapping.
4
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Do We Understand Magnetic Properties of ZnMnO?

52%
Godlewski M., Wójcik A., Kopalko K., Ivanov V., Wilamowski Z., Jakieła R., Guziewicz E., Szczepanik A., Dłużewski P., Chikoidze E., Barjon J., Dumont Y., Putkonen M., Niinistö L., Tang D.
Acta Physica Polonica A
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2007
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vol. 112
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issue 2
261-267
EN
Optical and magnetic properties of ZnMnO films are discussed based on the results of cathodoluminescence, photoluminescence, and magneto-photoluminescence investigations. We show that photoluminescence/cathodoluminescence emissions are strongly quenched and become in-plane inhomogeneous in samples with increased Mn fractions. Strong polarization of photoluminescence is observed, even though excitonic lines do not shift and are not split at magnetic fields up to 6 T.
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