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  • 1
    Digitale Medien
    Digitale Medien
    Photoluminescence characterization of InP surface reactive ion etched by a gas mixture of ethane and hydrogen (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 2361-2365 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: InP crystals were etched by reactive ion etching (RIE) with gas mixture of ethane and hydrogen (C2H6/H2), and etching damages were characterized by photoluminescence (PL) measurements of near-edge and defect-related emissions. Near-edge PL emission intensities after RIE were equal to or larger than those before RIE, except for the samples etched for 50 min. The damage introduced by RIE was restricted to the very-near-surface region which can be removed by HF treatment. The peak energy of defect-related 1.1-eV deep emission bands shifted toward the lower-energy side for the crystals with etching damages at the surface. The peak shift is attributable to the increase of defect complexes such as P-vacancy–P-interstitial or P-vacancy–In-vacancy.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.349436
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  • 2
    Digitale Medien
    Digitale Medien
    Slow response and Eu2+-related trapping states in CaS:Eu thin-film electroluminescent devices (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5018-5024 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: In order to clarify causes of the slow buildup of the optical output, i.e., slow optical response, in red-emitting CaS:Eu thin-film electroluminescent devices, Eu2+ concentration and temperature dependence of the response time of transferred electrons were measured. It was found that the response time increased exponentially with the increase in Eu2+ concentration and temperature. To understand these results, trapping states in CaS:Eu phosphor layer were studied by measuring temperature dependence of the following electro-optical characteristics with Eu2+ concentration as a parameter; (i) decay profile of trapped electrons, (ii) photoluminescent intensity, and (iii) photoinduced charge density. From these measurements, it was found that there existed two kinds of shallow states in the band gap of CaS. One was electron trapping states located at approximately 0.15 eV below the conduction-band minimum. These states were considered to be generated by Eu2+ clusters. The other was located at 0.06–0.08 eV below the conduction-band minimum. These states were considered to be 5d-excited states of isolated Eu2+ activators. Based on these experimental results, an energy band model for CaS:Eu thin film was proposed and causes for the slow optical response were discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.349006
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  • 3
    Digitale Medien
    Digitale Medien
    Effects of an electric field on exciton recombination in three-step asymmetric coupled quantum wells (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 2105-2109 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The radiative transitions of (100)- and (311)A-oriented three-step asymmetric coupled quantum wells in an electric field are studied by photoluminescence. Four distinct transitions are observed in the spectra which exhibit remarkably complex energy shifts with the applied field. It is shown that these transitions originate from the two pairs of spatially direct and indirect heavy-hole excitons in the three-step quantum well and that their electric-field dependence is dominated by the conversion of the direct into the indirect excitons and vice versa. Furthermore, we discuss the effects of the nonconventional crystal orientation and show that substantial modifications of the basic electro-optical properties can be achieved from internal piezoelectric fields incorporated within the structure.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.356315
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  • 4
    Digitale Medien
    Digitale Medien
    Mesh effect in a parallel-plate analyzer (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 1606-1612 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: The effect of field irregularity due to the use of conducting meshes to cover holes of a lower electrode in a parallel-plate electrostatic analyzer, is experimentally and numerically investigated. Displacement of a focal point and degradation of analyzer characteristics are found in the experiment. Dependence of analyzer characteristics on wire spacing is obtained. Primary results are also confirmed by numerical analysis. Criteria for error estimation are theoretically derived and found to be consistent with the experiment.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1144900
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  • 5
    Digitale Medien
    Digitale Medien
    Sm2+-doped silicate glasses prepared by a sol-gel process (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 1227-1229 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Silicate glasses, Al2O3⋅9SiO2, were successfully prepared to incorporate Sm2+ ions using a sol-gel process. The glasses synthesized through hydrolysis of Si(OC2H5)4, Al(OC4H9)3, and SmCl3⋅6H2O were heated in air, followed by heating in the presence of hydrogen, in which samarium ions were reduced from the trivalent to divalent state. Glasses incorporated with Sm2+ were colorless, transparent, and showed an intense emission with peaks at 683, 700, and 725 nm due to 5D0→7F0,1,2 transitions, respectively, of the Sm2+ ions. Irradiating the glasses with an Ar laser lowered the intensities of emission from Sm2+ ions and did not promote the formation of Sm3+ ions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.112078
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  • 6
    Digitale Medien
    Digitale Medien
    Shaped electrode system for high voltage parallel plate analyzer (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 4446-4449 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A new modification on the parallel plate analyzer for 500 keV heavy ions to eliminate the effect of the intense UV and visible radiation, is successfully implemented. Its design principle and results of numerical optimization are presented. In addition, the analyzer characteristics experimentally obtained in a high temperature plasma device, are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1143695
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  • 7
    Digitale Medien
    Digitale Medien
    Preferential Orientation and Strain-Dichroism of Polymer Chains (1969)
    s.l. : American Chemical Society
    Macromolecules 2 (1969), S. 335-342 
    Details
    ISSN: 1520-5835
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ma60010a004
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  • 8
    Digitale Medien
    Digitale Medien
    Bridging of macrodithionolactones to bicyclic systems. Synthesis and modeling of oxapolycyclic frameworks (1990)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 112 (1990), S. 3040-3054 
    Details
    ISSN: 1520-5126
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ja00164a026
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  • 9
    Digitale Medien
    Digitale Medien
    Generation and annihilation of positive and negative ion-depleted region in soda-lime silicate glass (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 691-697 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The combination experiments of ac and dc (as the thermally stimulated polarization current) suggest that, by the dc process, there appeared the positive and negative ion-depleted region at the interface between glass bulk and the positive ion-depleted region near the anode. This may be the ionic analog for a p-n junction under reverse bias of a semiconductor. The relaxation in polarized glass would take place by the annihilation of the positive and negative ion-depleted region by back-diffusion of oxygen ions from the positive ion-depleted region and of sodium ions from the bulk.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.345773
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  • 10
    Digitale Medien
    Digitale Medien
    Instabilities and vortex dynamics in shear flow of magnetized plasmas (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 938-954 
    Details
    ISSN: 1089-7666
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Gradient-driven instabilities and the subsequent nonlinear evolution of generated vortices in sheared E×B flows are investigated for magnetized plasmas with and without gravity (magnetic curvature) and magnetic shear by using theory and implicit particle simulations. In the linear eigenmode analysis, the instabilities considered are the Kelvin–Helmholtz (K–H) instability and the resistive interchange instability. The presence of the shear flow can stabilize these instabilities. The dynamics of the K–H instability and the vortex dynamics can be uniformly described by the initial flow pattern with a vorticity localization parameter ε. The observed growth of the K–H modes is exponential in time for linearly unstable modes, secular for the marginal mode, and absent until driven nonlinearly for linearly stable modes. The distance between two vortex centers experiences rapid merging while the angle θ between the axis of the vortices and the external shear flow increases. These vortices proceed toward their overall coalescence, while shedding small-scale vortices and waves. The main features of vortex dynamics, the nonlinear coalescence and the tilt or the rotational instabilities of vortices, are shown to be given by using a low-dimension Hamiltonian representation for interacting vortex cores in the shear flow.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.859850
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