Autor: Swiatek, K. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Ionization Energies of RE Ions in wide Bandgap Sulphides
Autorzy:: Świątek, K.
Godlewskl, M.
Powiązania:: https://bibliotekanauki.pl/articles/1879958.pdf
Data publikacji:: 1991-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.55.Gs
78.55.Et
Opis:: An analysis of rare earth (RE) energy level positions in wide bandgap sulphides is presented. It is shown that the Jörgensen's refined spin-pairing energy theory (RESPET) predicts correctly the photo-ionization (PI) energy of Sm in ZnS.
Źródło:: Acta Physica Polonica A; 1991, 79, 2-3; 247-250
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: SrS:Eu and CaS:Eu Thin Films: Influence of Host Lattice on Kinetics of Europium Emission
Autorzy:: Świątek, K.
Godlewski, M.
Niinistö, L.
Leskelä, M.
Powiązania:: https://bibliotekanauki.pl/articles/1923720.pdf
Data publikacji:: 1992-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.55.Gs
76.30.Kg
78.55.Et
Opis:: 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.
Źródło:: Acta Physica Polonica A; 1992, 82, 5; 769-772
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: On the Nature of Eu-Related Emissions in ZnS and CaS
Autorzy:: Świątek, K.
Godlewski, M.
Niinistö, L.
Leskelä, M.
Powiązania:: https://bibliotekanauki.pl/articles/1879960.pdf
Data publikacji:: 1991-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.55.Gs
71.35.+z
78.55.Et
Opis:: 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$\text{}^{2+}$ center, while in CaS the emission is dominated by the direct Eu$\text{}^{2+}$ intra-ion transition.
Źródło:: Acta Physica Polonica A; 1991, 79, 2-3; 255-257
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Rare-Earth Excitation Mechanism in Wide Band Gap H-VI Compounds
Autorzy:: Karpińska, K.
Świątek, K.
Godlewski, M.
Niinistö, L.
Leskelä, M.
Powiązania:: https://bibliotekanauki.pl/articles/1929798.pdf
Data publikacji:: 1993-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.55.Gs
76.30.Kg
78.55.Et
Opis:: 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.
Źródło:: Acta Physica Polonica A; 1993, 84, 5; 959-962
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: Co$\text{}^{2+}$ Ions in ZnS$\text{}_{x}$Se$\text{}_{1-x}$:Co - ESR and Optical Studies
Autorzy:: Świątek, K.
Surkova, T. P.
Sienkiewicz, A.
Zakrzewski, A. J.
Godlewski, M.
Giriat, W.
Powiązania:: https://bibliotekanauki.pl/articles/1992580.pdf
Data publikacji:: 1998-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.55.Gs
76.30.Fc
78.55.Et
Opis:: The electron spin resonance of Co$\text{}^{2+}$ ions in ZnS$\text{}_{x}$Se$\text{}_{1-x}$:Co mixed crystals was measured at temperature of 3 K and microwave frequency of 9.47 GHz. Trigonal Co$\text{}_{Zn}^{2+}$-S center in the ZnS$\text{}_{0.001}$Se$\text{}_{0.999}$:Co crystal was identified and parameters of relevant spin Hamiltonian were determined. Influence of alloy disorder in the anion sublattice on the Co$\text{}_{Zn}^{2+}$ ground and first excited states is briefly discussed.
Źródło:: Acta Physica Polonica A; 1998, 94, 3; 593-596
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 6.

Tytuł:: Optically Detected Magnetic Resonance Studies of Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te (x=0.095, 0.007)
Autorzy:: Godlewski, M.
Świątek, K.
Gałązka, R. R.
Monemar, B.
van Loosdrecht, P. H. M.
Wittlin, A.
Perenboom, J. A. A. J.
Powiązania:: https://bibliotekanauki.pl/articles/1929637.pdf
Data publikacji:: 1993-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 76.70.Hb
78.55.Et
71.35.+z
Opis:: The dominant mechanism responsible for the optical detection of the Mn$\text{}^{2+}$ magnetic resonance in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te (x = 0.095, 0.007) is explained. By either change of the external magnetic field or by setting the conditions for the Mn$\text{}^{2+}$ magnetic resonance, we could change the relative efficiencies of the two competing excitonic recombination processes. By lowering magnetization at the magnetic resonance, recombination via the acceptor bound exciton channel, which is mainly nonradiative, is enhanced. Then, a large up to 50% decrease in the total photoluminescence efficiency was observed in the optically detected magnetic resonance experiment. Such observation allows for verification of the large efficiency of the Auger-type transition responsible for the nonradiative decay of the acceptor bound exciton.
Źródło:: Acta Physica Polonica A; 1993, 84, 3; 539-542
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 7.

Tytuł:: Origin of Ultrafast Component of Photoluminescence Decay in Nanostructures Doped with Transition Metal or Rare-Earth Ions
Autorzy:: Godlewski, M.
Yatsunenko, S.
Ivanov, V. Yu.
Khachapuridze, A.
Świątek, K.
Goldys, E. M.
Phillips, M. R.
Klar, P. J.
Heimbrodt, W.
Powiązania:: https://bibliotekanauki.pl/articles/2041630.pdf
Data publikacji:: 2005-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.55.Gs
76.30.Fc
76.70.Hb
78.55.Et
Opis:: Bulk samples, layers, quantum well, and quantum dot structures of II-Mn-VI samples all show coexistence of slow and fast components of Mn$\text{}^{2+}$ photoluminescence decay. Thus, fast photoluminescence decay cannot be related to low dimensionality of a host material. This also means that the model of the so-called quantum confined atom is incorrect. Based on the results of time-resolved photoluminescence and optically detected magnetic resonance investigations we relate the observed lifetime decrease in Mn$\text{}^{2+}$ intra-shell transition to spin dependent magnetic interactions between localized spins of Mn$\text{}^{2+}$ ions and between Mn$\text{}^{2+}$ ions and spins/magnetic moments of free carriers. The latter mechanism is enhanced in nanostructures.
Źródło:: Acta Physica Polonica A; 2005, 107, 1; 65-74
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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