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Wyświetlanie 1-15 z 92
Tytuł:
$SiO_x$ Nanowires Produced on Molybdenum-Coated Si Substrates
Autorzy:
Kim, H.
Lee, J.
Yang, J.
Powiązania:
https://bibliotekanauki.pl/articles/1813396.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.-b
78.55.-m
Opis:
We synthesized $SiO_x$ nanowires with diameters of 30-140 nm, for the first time by the simple heating of the Mo-coated Si substrates. X-ray diffraction, selected area electron diffraction, and energy-dispersive X-ray spectroscopy indicated that the nanowires were in an amorphous state, comprising Si and O only. Fitting the photoluminescence spectrum with Gaussian functions revealed that the nanowires exhibited significant photoluminescence intensities near blue and green light regions. We extensively discussed the possible growth mechanism of $SiO_x$ nanowires.
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 1017-1020
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Band Structure and Optical Properties οf the Layered $Hg_{3}TeCl_{4}$ Crystal
Autorzy:
Sznajder, M.
Bercha, D.
Potera, P.
Khachapuridze, A.
Panko, V.
Bercha, S.
Powiązania:
https://bibliotekanauki.pl/articles/1791361.pdf
Data publikacji:
2009-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.-e
78.40.-q
78.55.-m
71.20.-b
Opis:
First experimental investigations on absorption and photoluminescence of the novel $Hg_{3}TeCl_{4}$ monocrystals grown by the Bridgman method are reported. A comparison of the measurement results with theoretical band structure calculations of the $Hg_{3}TeCl_{4}$ crystal confirmed that $Hg_{3}TeCl_{4}$ is a wide-band-gap photoconductor ($E_{g}$ = 3.64 eV at 24 K) with the effective masses of charge carriers characteristic for semiconductors. Energetic position of the main photoluminescence peak and its temperature dependence indicates the presence of an additional energy level in the energy gap which takes part in the radiative recombination process and whose origin was discussed.
Źródło:
Acta Physica Polonica A; 2009, 116, 5; 950-951
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Catalyst-Free Growth of Magnesium Oxide Whiskers and Their Characteristics
Autorzy:
Kim, H.
Kong, M.
Yang, J.
Powiązania:
https://bibliotekanauki.pl/articles/1813397.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.-b
78.55.-m
Opis:
This study reports the production of magnesium oxide (MgO) whiskers on silicon (Si) substrates by the thermal heating of $MgB_2$ powders. We investigated the structural properties of the as-synthesized whiskers by using X-ray diffraction, transmission electron microscopy, selected area electron diffraction, and scanning electron microscopy. The product consisted of one-dimensional whiskers with a square cross-section. The whiskers had a single-crystalline cubic structure of MgO. The photoluminescence measurement with the Gaussian fitting exhibited visible light emission bands centered at 2.39 eV and 2.91 eV. We proposed the growth of MgO whiskers to follow the vapor-solid mechanism.
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 1021-1024
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of ZnO Films Grown at Low Temperature
Autorzy:
Przeździecka, E.
Krajewski, T.
Wójcik-Głodowska, A.
Yatsunenko, S.
Łusakowska, E.
Paszkowicz, W.
Guziewicz, E.
Wachnicki, Ł.
Szczepanik, A.
Godlewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1811975.pdf
Data publikacji:
2008-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.-m
81.10.-h
85.30.Fg
Opis:
ZnO thin films were grown by atomic layer deposition method at extremely low temperature using a reactive diethylzinc as a zinc precursor. Optical properties, electrical properties and surface morphology were examined by photoluminescence, Hall effect and atomic force microscope. The study shows correlation between optical, electrical properties and surface morphology in a series of samples of different thickness.
Źródło:
Acta Physica Polonica A; 2008, 114, 5; 1303-1310
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative Spectroscopic Study of the Dy$\text{}^{3+}$ Doped Double Chloride and Double Fluoride Crystals for Telecommunication Amplifiers and IR Lasers
Autorzy:
Tkachuk, A.
Ivanova, S.
Isaenko, L.
Yelisseyev, A.
Payne, Steve
Solarz, R.
Nostrand, M.
Page, R.
Payne, Stephen
Powiązania:
https://bibliotekanauki.pl/articles/1995823.pdf
Data publikacji:
1999-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.-m
Opis:
In this work we studied spectroscopic characteristics of potassium-lead double-chloride, and lithium-yttrium double-fluoride crystals doped with dysprosium. Objects of research were KPb$\text{}_{2}$Cl$\text{}_{5}$:Dy$\text{}^{3+}$, and LiYF$\text{}_{4}$ (YLF):Dy$\text{}^{3+}$ crystals grown by the Bridgman-Stockbarger technique. We obtained the effective distribution coefficients K$\text{}_{Dy}$=0.95 for LiYF$\text{}_{4}$ :Dy$\text{}^{3+}$, and K$\text{}_{Dy}$=1 for KPb$\text{}_{2}$Cl$\text{}_{5}$:Dy$\text{}^{3+}$. Optical spectra were studied, intensity parameters were determined by the Judd-Ofelt method, and radiative probabilities and branching ratio were calculated. The conclusion was made that the studied crystals can be considered as promising new active media for laser diode pumped solid state lasers. The YLF:Dy$\text{}^{3+}$ crystals are perspective for laser action near 3 mm, and the KPb$\text{}_{2}$Cl$\text{}_{5}$ :Dy$\text{}^{3+}$ for multiwavelength IR lasers, and for 1.3 mm laser diode pumped telecommunication amplifiers.
Źródło:
Acta Physica Polonica A; 1999, 95, 3; 381-394
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Competition of Radiation Processes in 6H-SiC Observed by Luminescence
Autorzy:
Wysmołek, A.
Mroziński, P.
Dwiliński, R.
Vlaskina, S.
Kamińska, M.
Powiązania:
https://bibliotekanauki.pl/articles/1873137.pdf
Data publikacji:
1995-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.-m
78.60.Kn
Opis:
We report on the results of photoluminescence and thermoluminescence measurements of various 6H-SiC crystals. At low temperature in all n-type samples two bands with maxima at 2.7 eV (blue) and 1.8 eV (orange) were detected. In the p-type material only blue band was observed. The measurements performed at a broad range of temperatures showed totally different behaviour of photoluminescence intensity of both bands. The presented results could be explained in the model assuming well established donor-acceptor pair recombination for the blue band emission and the conduction band - deep defect transition for the orange band. The proposed model was confirmed by thermoluminescence measurements of the orange band which showed peaks at 30 K, 80 K, 100 K, 150 K attributed to ionization of subsequent shallow donor levels.
Źródło:
Acta Physica Polonica A; 1995, 87, 2; 437-440
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Consequences of Confinement Conditions on Absorption in Molecular Nanofilms
Autorzy:
Šetrajčić, I.
Rodić, D.
Šetrajčić, J.
Šetrajčić-Tomić, A.
Vučenović, S.
Powiązania:
https://bibliotekanauki.pl/articles/1030578.pdf
Data publikacji:
2018-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.35.-y
71.35.Aa
77.22.Ch
77.55.-g
78.20.Bh
78.68.+m
81.07.Nb
Opis:
This paper presents a model of molecular ultrathin crystalline film and analysis of dielectric properties of these spatially very restricted structures. Using the two-time dependent Green functions the energy spectrum and possible exciton states were determined and the dynamic permittivity was calculated. It was shown that the appearance of localized states in the boundary layers of the film depend on the thickness and the changing values of parameters in the border areas of the film. These localized states define schedule and determine the number of resonant absorption lines in the infrared area of the external electromagnetic radiation.
Źródło:
Acta Physica Polonica A; 2018, 133, 1; 129-139
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control of Valence-Band Hole Spin by Electric Field
Autorzy:
Dargys, A.
Powiązania:
https://bibliotekanauki.pl/articles/2037172.pdf
Data publikacji:
2004-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.20.Jv
73.40.Gk
78.55.-m
79.90.+b
Opis:
Coherent properties of the hole spin in an electric field are investigated. The tunneling between valence bands is used to control the transitions between the spin states. Extensive numerical studies using the time-dependent Schrödinger equation for valence band are presented to demonstrate the characteristic properties of the hole spin dynamics in dc, harmonic, as well as optimized electric fields for real valence bands of silicon. The paper also shows how one can connect the average hole spin with the initial hole wave function in the time-dependent Schrödinger equation.
Źródło:
Acta Physica Polonica A; 2004, 105, 3; 295-306
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Controlling the biexciton-exciton cascade kinetics in a quantum dot via coupling to a microcavity optical mode
Autorzy:
Sęk, G.
Krizhanovskii, D.
Kulakovskii, V.
Reitzenstein, S.
Kamp, M.
Powiązania:
https://bibliotekanauki.pl/articles/1160147.pdf
Data publikacji:
2016-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.Hc
71.35.-y
78.55.-m
42.50.Pq
Opis:
The luminescence of single and two exciton states in a quantum dot embedded in the active layer of a micropillar cavity has been investigated. Temperature tuning has been used to bring the energy states of the quantum dot and the cavity into resonance. Studying the resonance behavior of the exciton and biexciton transitions with cavity mode revealed a similar Purcell effect for both lines. The cavity-induced changes of the respective radiative lifetimes have been shown to allow for controlling the ratio between the single and two exciton occupation and their relative emission rates in a single quantum dot.
Źródło:
Acta Physica Polonica A; 2016, 129, 1a; A-44-A-47
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlative optical spectroscopy and atom probe tomography
Autorzy:
Rigutti, L.
Powiązania:
https://bibliotekanauki.pl/articles/1156501.pdf
Data publikacji:
2016-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.46.-w
61.72.-y
68.65.-k
78.55.-m
78.67.-n
Opis:
This lecture will introduce and revise recent experimental developments on correlative laser-assisted atom probe tomography and optical spectroscopy, with a particular attention to the domain of semiconductor nanostructures. The main goal of correlative microscopy is to gain a deeper insight in materials science studies. For the materials scientist, indeed, the possibility of establishing a link between optical spectroscopic properties of a given system and the reconstruction of its 3D structure and composition by atom probe tomography yields an unprecedented insight into the complex influence of the structure on the electronic states and on the optical transitions characterizing the system. This lecture will therefore revise the different approaches by which it is possible to correlate optical spectroscopy experiments - in particular micro-photoluminescence with atom probe tomography and, possibly, with transmission electron microscopy. Dedicated sample preparation protocols and recent case studies will be reported. Finally, a perspective approach will be introduced, in which the same femtosecond laser pulse could be exploited not only for triggering ion evaporation, but also photon emission in situ in the atom probe itself.
Źródło:
Acta Physica Polonica A; 2016, 129, 1a; A-7-A-25
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of Free Exciton Capture Cross Section of Si:Al by Photoluminescence
Autorzy:
Schramm, G.
Powiązania:
https://bibliotekanauki.pl/articles/1887812.pdf
Data publikacji:
1991-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.-m
Opis:
The free excitons capture rate and capture cross-section of the neutral Al atom in silicon were determined at 4.2 K. The obtained values are of the same order of magnitude as reported values of other shallow dopants.
Źródło:
Acta Physica Polonica A; 1991, 79, 6; 869-872
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of dielectric medium anisotropy on the polarization degree of emission from a single quantum dash
Autorzy:
Mrowiński, P.
Tarnowski, K.
Olszewski, J.
Somers, A.
Kamp, M.
Höfling, S.
Reithmaier, J.
Urbańczyk, W.
Misiewicz, J.
Machnikowski, P.
Sęk, G.
Powiązania:
https://bibliotekanauki.pl/articles/1159588.pdf
Data publikacji:
2016-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.Hc
71.35.-y
78.55.-m
Opis:
Excitonic emission from single InAs/InGaAlAs/InP quantum dashes has been investigated in the context of degree of linear polarization by post-growth modification of its surrounding dielectric medium. We present optical spectroscopy measurements on a symmetric squared pedestal structures (mesas), and asymmetric rectangular ones oriented parallel or perpendicular to the main in-plane axis of the dashes [1-10]. Polarization resolved microphotoluminescence shows a significant quantitative modification of the degree of linear polarization value from -20% up to 70%. These results have been confronted with calculations of the coupling between the exciton transition dipole moment and electromagnetic field distributed in the vicinity of a quantum dash inside a processed mesa.
Źródło:
Acta Physica Polonica A; 2016, 129, 1a; A-48-A-52
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Preheating Temperature on Microstructure and Optical Properties of ZnO Thin Films Prepared by Sol-Gel Spin Coating Technique
Autorzy:
Ji, Qiang-min
Wang, Ya-li
Gao, Xiao-yong
Gao, Hui
Zhai, Yao-fei
Powiązania:
https://bibliotekanauki.pl/articles/1398971.pdf
Data publikacji:
2016-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Et
78.55.-m
Opis:
Highly-oriented ZnO thin films prepared by using low-cost technique such as sol-gel technique are of much importance to ZnO-based white light-emitting diodes. The chose of proper preheating temperature in sol-gel technique is still critical for highly-oriented ZnO thin film so far. The mechanisms for the preheating in the formation of ZnO thin film and for the reactions involved in the sol solution have not been clearly stated yet. Thus, in this work, the highly-oriented ZnO thin films were prepared on glass substrates by using sol-gel spin-coating technique. The sol solution was prepared by using the two-step method rather than usual one-step method, which facilitates the understanding of the mechanism for the reactions involved in the sol solution. The effect of the preheating temperature on the microstructure and the optical properties of the films were in particular investigated. The mechanisms for the preheating in the formation of the films and for the reactions involved in the sol solution prepared by the two-step method were also proposed in terms of the experimental results. The preheating not only enhances the volatilization of the solvent 2-methoxyethanol and the decomposition of the residual organic species, but also results into the formation of small number of ZnO particles. The preheating temperature of 300°C is most favorable for the highly-oriented ZnO thin film. Increasing the preheating temperature results into the blue shift of the absorption edges of the films. This can be explained by using the quantum-size effect. The photoluminescence spectra of the films show an UV emission at the near-band edge and a broad green-yellow emission at 470-620 nm. The former is closely related to the excitons, while the latter is to the intrinsic defect species in the film.
Źródło:
Acta Physica Polonica A; 2016, 129, 6; 1191-1196
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Trisodium Citrate on the Morphology and Luminescence Properties of Hydrothermally Synthesized YVO₄ Phosphor
Autorzy:
Zhang, Sa
Liang, Yan
Gao, Xiaoyong
Powiązania:
https://bibliotekanauki.pl/articles/1398668.pdf
Data publikacji:
2016-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.-m
61.05.cp
68.37.Hk
78.30.-j
Opis:
YVO₄ phosphors with different morphologies were synthesized by trisodium citrate (Na₃cit) surfactant-assisted hydrothermal process. Effects of molar ratio of $\text{cit}^{3-}$ to $Y^{3+}$ and pH value of reaction solution were intensively investigated on the morphologies, structures and luminescence properties of YVO₄ phosphor. The morphologies of the YVO₄ particles can be effectively controlled in strong acidic and strong alkaline environment by affecting the adsorption of $\text{cit}^{3-}$ on the (001) crystal plane of YVO₄. Strong acidic condition resulted into excessive adsorption of $\text{cit}^{3-}$ groups on the YVO₄ phosphor, which annihilated the superior luminescence of YVO₄ phosphors. On the contrary, strong alkaline condition does not result into the adsorption of $\text{cit}^{3-}$ groups. The synthesized YVO₄ phosphor without adsorption of $\text{cit}^{3-}$ groups showed superior luminescence even though the effective control of the morphology in alkaline condition is not so good as in strong acidic condition.
Źródło:
Acta Physica Polonica A; 2016, 129, 1; 79-83
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy Level Scheme of Nd$\text{}^{3+}$ Ion in Rare Earth Oxyhalides, REOX (X = F, Cl, and Br)
Autorzy:
Beaury, L.
Hölsä, J.
Korventausta, J.
Krupa, J.-C.
Lamminmäki, R.-J.
Porcher, P.
Rahiala, H.
Säilynoja, E.
Powiązania:
https://bibliotekanauki.pl/articles/1952823.pdf
Data publikacji:
1996-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.-i
71.70.Ch
78.40.-q
78.55.-m
Opis:
The energy level schemes of the neodymium oxyhalides (NdOX, X = F, Cl, and Br) were studied and simulated with a phenomenological model accounting simultaneously for both the free ion interactions and the crystal field effect. The former included the electrostatic and interconfigurational interactions as well as the spin-orbit coupling. The simulations were carried out by using the data from the optical absorption and luminescence as well as the inelastic neutron scattering measured at low temperatures between 2.5 and 77 K. The values of the Slater integral F$\text{}^{2}$ describing the electrostatic interactions decrease while F$\text{}^{4}$ and F$\text{}^{6}$ increase as a function of the ionic radius of the halide anion. The strength of the spin-orbit coupling is quite the same in all three matrices. The crystal field effect - measured as the crystal field strength parameter S - is almost twice as strong in the hexagonal NdOF matrix (650 cm$\text{}^{-1}$) than in the tetragonal NdOCI or NdOBr (367 and 378 cm$\text{}^{-1}$, respectively). Similar evolution was obtained for the short-and mid-range crystal field strengths related to the spatial extension of the interaction.
Źródło:
Acta Physica Polonica A; 1996, 90, 6; 1203-1213
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 92

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