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Wyszukujesz frazę "Grinberg, M." wg kryterium: Autor


Wyświetlanie 1-9 z 9
Tytuł:
Shallow-Deep Instability of Donor States in Many-Valley Semiconductors
Autorzy:
Grinberg, M.
Powiązania:
https://bibliotekanauki.pl/articles/1890895.pdf
Data publikacji:
1991-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.-i
71.38.+i
Opis:
The shallow-deep instability of double and single donors in multi-valley semi conductors using the model Hamiltonian is studied. The obtained results describe properly the properties of double donors (in D$\text{}^{0}$ and D$\text{}^{+}$ state) in Ge and single deep donors in Al$\text{}_{x}$Ga$\text{}_{1-x}$As for 0.3 < x < 0.5.
Źródło:
Acta Physica Polonica A; 1991, 80, 3; 361-364
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Twinning on Local Electronic Properties of ZnSe
Autorzy:
Balcerzyk, M.
Grinberg, M.
Szatkowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1924230.pdf
Data publikacji:
1992-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.70.Ng
71.55.Gs
72.80.Ey
Opis:
We have obtained ZnSe single crystals by vertical Bridgman method. The surface was examined using scanning electron microscope (SEM). As usual crystals exhibited twins, which were observed on the (110) surface. On as-grown and n-type samples we observed long (of the order of millimetres) linear structures parallel to the (111) plane which correspond to the twin plane. Our observations and measurements enabled us to estimate the electronic potential as being of the order of a few volts and extending less than 1 μm in the direction perpendicular to the twin planes.
Źródło:
Acta Physica Polonica A; 1992, 82, 5; 890-892
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin-Orbit Coupling in Cr$\text{}^{3+}$ Ion in Solid State Materials
Autorzy:
Wojtowicz, A. J.
Grinberg, M.
Łempicki, A.
Powiązania:
https://bibliotekanauki.pl/articles/1879947.pdf
Data publikacji:
1991-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Hx
Opis:
In this paper we introduce a new model describing the coupling of $\text{}^{2}$E and $\text{}^{4}$T$\text{}_{2}$ states of octahedrally coordinated Cr$\text{}^{3+}$ ion, which includes spin-orbit and electron-lattice interactions and takes into account the electronic structure of both states. The model is used to calculate doublet lifetime. We have applied this model to the series of Cr$\text{}^{3+}$ doped garnets characterized by the varying crystal field parameter 10 Dq and O$\text{}_{h}$ symmetry of the Cr site and to the kyanite (Al$\text{}_{2}$O$\text{}_{3}$:SiO$\text{}_{2}$), which is the case of different Cr$\text{}^{3+}$ sites in one material, characterized by the relatively large component of the low symmetry crystal field. The agreement with experiment is reasonable.Z
Źródło:
Acta Physica Polonica A; 1991, 79, 2-3; 235-238
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Luminescence and Luminescence Kinetics of $Gd_{3}Ga_{5}O_{12}$ Polycrystals Doped with $Cr^{3+}$ and $Pr^{3+}$
Autorzy:
Mahlik, S.
Kukliński, B.
Grinberg, M.
Kostyk, Ł.
Tsvetkova, O.
Powiązania:
https://bibliotekanauki.pl/articles/1550204.pdf
Data publikacji:
2010-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Hx
78.60.Kn
78.70.En
Opis:
In this paper spectroscopic investigations of $Gd_3Ga_5O_{12}$ (GGG) polycrystals, containing $Cr^{3+}$ and intentionally doped with $Pr^{3+}$ of concentrations 0.5, 1 and 1.5 mol% are presented. We have measured the steady state luminescence and luminescence excitation spectra, as well as the time resolved spectra and luminescence kinetics. The main goal was to investigate the excitation energy transfer from lattice to impurity and between impurities. We found that relative intensity of $Cr^{3+}$ and GGG lattice luminescence decreased when material was doped with $Pr^{3+}$. On the other hand, time resolved spectroscopy and luminescence decay measurements showed that the $Cr^{3+}$ and GGG lattice luminescence decays were independent of $Pr^{3+}$ content. The lifetime of $Pr^{3+}$ luminescence related to $\text{}^{1}D_{2} \rightarrow \text{}^{3}H_{4}$ and $\text{}^{3}P_{0} \rightarrow \text{}^{3}H_{4}$ transitions decreased with concentration of $Pr^{3+}$, which was attributed to the concentration luminescence quenching. No energy transfer between GGG lattice defects and $Cr^{3+}$, and $Pr^{3+}$ ions was observed. We proposed the model of radiative recombination of electron and hole, which took place through three independent pathways: by GGG host emission that peaked at 12750 $cm^{-1}$, by $Cr^{3+}$ luminescence that peaked at 15400 $cm^{-1}$, and by $Pr^{3+}$ luminescence.
Źródło:
Acta Physica Polonica A; 2010, 117, 1; 117-121
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Synthesis Temperature on Manufacturing and Properties of SrSi2O2N2:Eu2+ Powders
Autorzy:
Pawlik, T.
Michalik, D.
Barzowska, J.
Szczodrowski, K.
Lesniewski, T.
Sopicka-Lizer, M.
Grinberg, M.
Powiązania:
https://bibliotekanauki.pl/articles/353501.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
luminescence
LED
oxynitrides
Opis:
This paper presents the results of the synthesis temperature on the properties of the ceramic powders of SrSi2O2N2:Eu2+ obtained by the solid-phase reaction. Synthesis was carried out in the temperature range of 1250-1650°C for 2 hours in nitrogen flow in the reducing atmosphere of the graphite furnace. The phases present in the resultant powders were identified by X-ray structural analysis (XRD). Scanning electron microscopy (SEM) was used to examine the changes in the powder morphology as a result of the synthesis. The excitation and emission spectra measurements let to study phosphor photoluminescence properties. The results show the strong influence of temperature synthesis on the formation and purity of expected phases. The synthesis temperature also affects the luminescent properties of SrSi2O2N2:Eu2+ ceramic powders.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 687-690
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photoluminescence Kinetics of YAG Crystals Activated with Ce, and Ce and Mg
Autorzy:
Barzowska, J.
Kubicki, A.
Grinberg, M.
Kaczmarek, S.
Łuczyński, Z.
Wojtowicz, A. J.
Koepke, Cz.
Powiązania:
https://bibliotekanauki.pl/articles/1995826.pdf
Data publikacji:
1999-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.-i
78.47.+p
78.55.-m
Opis:
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$\text{}^{3+}$ 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.
Źródło:
Acta Physica Polonica A; 1999, 95, 3; 395-402
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Excited State Absorption and Thermoluminescence in Ce and Mg Doped Yttrium Aluminum Garnet
Autorzy:
Wiśniewski, K.
Koepke, Cz.
Wojtowicz, A. J.
Drozdowski, W.
Grinberg, M.
Kaczmarek, S. M.
Kisielewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/2007834.pdf
Data publikacji:
1999-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Hx
78.55.-m
78.60.Kn
73.50.Gr
29.40.Mc
78.20.-e
78.20.Wc
78.40.-q
Opis:
In this paper we report preliminary results of optical studies on Y$\text{}_{3}$Al$\text{}_{5}$O$\text{}_{12}$ (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.
Źródło:
Acta Physica Polonica A; 1999, 95, 3; 403-412
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Blue fluorescence of Li↓2B↓4O↓7 glasses doped with rare-earths and transition metal ions
Autorzy:
Kaczmarek, Sławomir M.
Koepke, Czesław.
Grinberg, Marek.
Majchrowski, Andrzej.
Wiśniewski, Krzysztof.
Czuba, Mariusz.
Powiązania:
Biuletyn Wojskowej Akademii Technicznej 2001, nr 8, s. 131-145
Data publikacji:
2001
Tematy:
Krystalografia
Luminescencja
Szkło
Opis:
Niebieska fluorescencja szkieł Li↓2B↓4O↓7 domieszkowanych jonami ziem rzadkich i metali przejściowych.
Rys., tab.; Bibliogr.; Abstr., Rez., streszcz.
Dostawca treści:
Bibliografia CBW
Artykuł
Tytuł:
Controlling of the charge states in laser crystals
Autorzy:
Kaczmarek, Sławomir M.
Drozdowski, Winicjusz.
Grinberg, Marek.
Jabłoński, Ryszard.
Zimmerer, Georg.
Wojtowicz, Andrzej.
Koepke, Czesław.
Kisielewski, Jarosław.
Boulon, George.
Powiązania:
Biuletyn Wojskowej Akademii Technicznej 1999, nr 2, s. 105-116
Data publikacji:
1999
Tematy:
Krystalografia
Kryształy YAG
Opis:
Kontrolowanie stanów ładunkowych domieszek aktywnych w kryształach laserowych.
Rys.; Bibliogr.; Abstr., Rez., streszcz.
Dostawca treści:
Bibliografia CBW
Artykuł
    Wyświetlanie 1-9 z 9

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