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Wyświetlanie 1-15 z 31
Tytuł:
Charge Transfer States of Transition Metal and Rare Earth Ions: Their Role in Recombination Processes
Autorzy:
Godlewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1929777.pdf
Data publikacji:
1993-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.35.+z
78.55.Cr
78.55.Et
Opis:
Center ionization accompanied by carrier localization at the center by virtue of a short-range or a long-range Coulomb attractive potential is discussed. The role of charge transfer states in recombination processes is described. The source of carrier attractive potential is explained and a simple theoretical model is presented allowing to predict the nature (either electron or hole attractive) of this potential. The probability of different possible recombination paths is also analyzed.
Źródło:
Acta Physica Polonica A; 1993, 84, 5; 849-855
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nature of Blue Anti-Stokes Luminescence in ZnSe:Cr
Autorzy:
Ivanov, V. Yu.
Semenov, Yu. G.
Surma, M.
Godlewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1933759.pdf
Data publikacji:
1995-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Fc
71.55.Gs
78.55.Et
Opis:
The mechanism of the anti-Stokes photoluminescence in ZnSe:Cr is discussed. It is shown that the two-step ionization transitions of Cr(2$\text{}^{+}$ ↔ 1$\text{}^{+}$) result in appearance of the blue anti-Stokes photoluminescence of ZnSe:Cr. There are also some indications that the Auger type co-operative process can contribute to the photoluminescence excitation.
Źródło:
Acta Physica Polonica A; 1995, 88, 4; 743-746
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Tytuł:
Photo-ESR Studies of Ni doped ZnS and ZnSe
Autorzy:
Surma, M.
Zakrzewski, A. J.
Godlewski, M.
Surkova, T. P.
Powiązania:
https://bibliotekanauki.pl/articles/1932084.pdf
Data publikacji:
1995-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Gs
76.30.He
78.55.Et
Opis:
The results of electron spin resonance experiments are presented for nickel doped ZnS and ZnSe. Energy level position of Ni$\text{}^{1+}$ state in band gap of ZnS and ZnSe is determined. The nonradiative recombination processes of donor-acceptor pairs in Ni doped samples are discussed.
Źródło:
Acta Physica Polonica A; 1995, 87, 1; 221-224
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficient Two-Center Auger Mechanism of Electron Trapping by Fe$\text{}^{3+}$ Ions in ZnSe:Fe,Cr
Autorzy:
Surma, M.
Godlewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1968433.pdf
Data publikacji:
1997-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.He
71.55.Gs
78.55.Et
Opis:
A detailed analysis of decay kinetics of light induced electron spin resonance signals of Cr$\text{}^{1+}$ and Fe$\text{}^{3+}$ ions in ZnSe:Fe,Cr is given. We observe that the Cr$\text{}^{1+}$ electron spin resonance signal decays once free electrons are thermally ionized from shallow donors of ZnSe. Such unusual behavior of the Cr$\text{}^{1+}$ electron spin resonance signal is explained by efficient two-center Auger recombination: the Cr$\text{}^{1+}$ center is ionized due to the Auger-type energy transfer from the electron being trapped by the Fe$\text{}^{3+}$ ion. Such process is shown to be consistent with the temperature dependence of the decay times of electron spin resonance signals. Its quantum efficiency is estimated to be as large as 18% for Cr and Fe concentrations which were studied.
Źródło:
Acta Physica Polonica A; 1997, 92, 5; 1017-1020
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Tytuł:
Luminescence of Cd0.7Mn0.3Te Crystals in Transverse Magnetic Field
Autorzy:
Brazis, R.
Barauskaitė, L.
Ivanov, V.
Godlewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/2046833.pdf
Data publikacji:
2006-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Pp
78.55.Et
71.35.-y
Opis:
Photoluminescence of cleaved Cd0.7Mn0.3Te crystals is studied at T≈1.6 K at the normal- and oblique (45º) incidence of the pumping Ar laser beam (λ=488 nm) in magnetic fields -7≤ B≤7 T in the Voigt geometry. At B=0, photoluminescence maximum is found at 2.0819 eV at normal incidence (and backward emission) whereas the oblique incidence and emission shows photoluminescence maximum intensity at 2.0536 eV. The red shift of photoluminescence maximum position with the rise in B is observed and the results are found to be in good agreement with sp-d exchange interaction model for the oblique incidence case. Backward emitted photoluminescence line is found to narrow from 26.2 to 23.5 meV with the rise in B from 0 to 7 T. Alloy disorder contribution exhibits opposite trend to broaden, as is calculated on the basis of the matrix of the energy gap dependence on x and B. Therefore the observed photoluminescence line narrowing is assigned to the suppression of magnetic fluctuation in magnetic field. A linear size of magnetic fluctuation is estimated to be about 1/5 of the free exciton diameter. Photoluminescence maximum position difference in the normal- and oblique incidence cases is assigned to polaritons.
Źródło:
Acta Physica Polonica A; 2006, 109, 6; 731-741
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Magnetic Field on Blue Anti-Stokes Luminescence of ZnSe:Cr Crystals
Autorzy:
Ivanov, V. Yu.
Semenov, Yu.G.
Surma, M.
Godlewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1950807.pdf
Data publikacji:
1996-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Gs
78.55.Et
76.30.Fc
Opis:
The results of photoluminescence and magneto-luminescence studies of chromium doped ZnSe crystals are presented for blue colour shallow donor-shallow acceptor pair photoluminescence, with a zero phonon line at 2.692 eV. This donor-acceptor pair photoluminescence is observed under photo-excitation with photon energies smaller than the emission energy (anti-Stokes luminescence) and dominates in the photoluminescence spectrum of ZnSe:Cr at the excitation energy about 2.41 eV and for temperature T<20 K. A quantum efficiency of this anti-Stokes luminescence is relatively large. It is of about 10$\text{}^{-3}$ at 0 T and increases with increasing magnetic field up to 7 T at temperature T=2 K. We relate the intensity of the anti-Stokes luminescence to a non-equilibrium concentration of photo-excited Cr$\text{}^{+}$ ions and propose that the rate of spin-dependent recombination of Cr$\text{}^{+}$ ions with free holes (decreases with increasing magnetic field) is responsible for the observed increase in the anti-Stokes luminescence intensity at higher magnetic fields.
Źródło:
Acta Physica Polonica A; 1996, 90, 4; 821-824
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Free Carriers Heating at Mn$\text{}^{2+}$ Magnetic Resonance in CdMnTe
Autorzy:
Godlewski, M.
Gałązka, R. R.
Tsimperidis, I.
Gregorkiewicz, T.
Ammerlaan, C. A. J.
Powiązania:
https://bibliotekanauki.pl/articles/1931938.pdf
Data publikacji:
1995-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Et
76.70.Hb
75.30.Hx
Opis:
The results of optically detected magnetic and cyclotron resonance experiments performed on Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te (x = 0.007) are presented. It is shown that the Mn$\text{}^{2+}$ magnetic resonance results in heating of free holes, which can be observed via the effects of hot holes on the CdMnTe "edge" emission.
Źródło:
Acta Physica Polonica A; 1995, 87, 1; 177-180
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Tytuł:
Band Edge Energies Pinning in Magnetic Field in Semimagnetic $Cd_{0.7}Mn_{0.3}Te$
Autorzy:
Barauskaitė, L.
Brazis, R.
Ivanov, V.
Godlewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1492778.pdf
Data publikacji:
2011-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Et
75.50.Pp
71.70.-d
Opis:
Results of $Cd_{0.7}Mn_{0.3}Te$ magneto-photoluminescence investigations are analyzed. Photoluminescence was measured in a Voigt geometry at the temperature of 1.6 K. Two models describing radiative transition energy are compared with the experimental results of $Cd_{0.7}Mn_{0.3}Te$ luminescence. The energy of recombination transition, employing the complete form of band states splitting description (term due to the Landau splitting included), shows deviation from experiment at B > 2 T. Two possible reasons of discrepancies from the experiment - exchange interaction constants dependence on magnetic field or band edge energies pinning in magnetic field - are discussed. Band edge energies pinning in magnetic field is related to the hybridization of Mn 3 $d^{5}$ levels with the band states of the host. We determine the corrected values of exchange interaction constants $(N_0 α -N_0 β//3)$ at magnetic fields B < 5 T.
Źródło:
Acta Physica Polonica A; 2011, 120, 6; 1056-1060
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Microscopic Mechanisms of Blue Anti-Stokes Luminescence in Undoped and Chromium Doped ZnSe Crystals
Autorzy:
Ivanov, V. Yu.
Omel'chuk, A.
Godlewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1991537.pdf
Data publikacji:
1998-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Gs
78.55.Et
76.30.Fc
Opis:
Anti-Stokes luminescence is observed in chromium doped and in undoped ZnSe crystals. In the former case anti-Stokes luminescence is due to two complementary ionization transitions of Cr ions. In the latter case two-photon absorption becomes important at a high excitation density.
Źródło:
Acta Physica Polonica A; 1998, 94, 3; 365-368
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Properties of ZnCoO Films and Nanopowders
Autorzy:
Wolska, E.
Łukasiewicz, M.
Fidelus, J.
Łojkowski, W.
Guziewicz, E.
Godlewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1791349.pdf
Data publikacji:
2009-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.Ln
78.55.Et
81.07.Wx
61.72.uf
78.66.Hf
Opis:
ZnCoO is one of the most studied and promising semiconductor materials for spintronics applications. In this work we discuss optical and electrical properties of ZnCoO films and nanoparticles grown at low temperature by either atomic layer deposition or by a microwave driven hydrothermal method. We report that doping with cobalt quenches a visible photoluminescence of ZnO. We could observe a visible photoluminescence of ZnO only for samples with very low Co fractions (up to 1%). Mechanisms of photoluminescence quenching in ZnCoO are discussed. We also found that ZnO films remained n-type conductive after doping with Co, indicating that a high electron concentration and cobalt 2+ charge state can coexist.
Źródło:
Acta Physica Polonica A; 2009, 116, 5; 918-920
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recombination Processes in Doped CdTe/CdMnTe Multiple Quantum Well Structures Grown by Molecular Beam Epitaxy
Autorzy:
Godlewski, M.
Wojtowicz, T.
Karczewski, G.
Kossut, J.
Bergman, J. P.
Monemar, B.
Powiązania:
https://bibliotekanauki.pl/articles/1968089.pdf
Data publikacji:
1997-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.47.+p
78.55.Et
Opis:
An influence of doping level on exciton properties in n-doped multiple quantum well structures of CdTe/CdMnTe is studied for multiple quantum well structures prepared in the way that donor (indium) concentration changes within the length of the sample. We show that the formation scenario for neutral donor bound excitons in low-dimensional structures can be different from that observed in bulk samples. We further show that in the case of such quantum well structures we can selectively excite either photoluminescence emission of localized or donor bound excitons, which is a consequence of surprisingly weak energy transfer link between two types of excitonic transitions.
Źródło:
Acta Physica Polonica A; 1997, 92, 4; 757-760
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ZnO Nanopowders by a Microwave Hydrothermal Method - Influence of the Precursor Type on Grain Sizes
Autorzy:
Wolska, E.
Witkowski, B. S.
Godlewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/2048108.pdf
Data publikacji:
2011-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.-n
61.43.Gt
81.07.Wx
78.55.Et
Opis:
Two series of ZnO nanopowders obtained by a microwave hydrothermal method are examined. We used two different zinc precursors (zinc chloride (ZnCl$\text{}_{2}$) and zinc nitrate hexahydrate (N$\text{}_{2}$O$\text{}_{6}$Zn·6H$\text{}_{2}$O)). Both types of nanopowders show a bright emission in a visible light, including the band edge emission, which indicates their good crystallographic quality. Results of scanning electron microscopy, photo- and cathodoluminescence investigations are presented.
Źródło:
Acta Physica Polonica A; 2011, 119, 5; 683-685
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 31

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