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  • 1
    Electronic Resource
    Electronic Resource
    Microcavity effects in single-layer light-emitting devices based on poly(p-phenylene vinylene) (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 3299-3306 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electroluminescence and photoluminescence light-emitting devices based on poly(p-phenylene vinylene) (PPV), with emitting layers of different thicknesses, were examined. It was shown that microcavity effects occur in thin PPV single-layer sandwich structures (ITO/PPV/Al, Au/PPV/Al) in both electroluminescent and photoluminescent emission. Microcavity effects were demonstrated for a range of different PPV layer thicknesses down to 40 nm. We have successfully prepared resonant-cavity single-layer light-emitting diodes with enhanced external quantum efficiencies of up to 0.1% photons/electron, with aluminum as the electron injecting and gold as the hole injecting electrode. Less pronounced microcavity effects were observed on devices with ITO as the hole injecting contact, due to the low reflectivity of the ITO-glass interface. These findings were confirmed by theoretical simulations based on an optical transfer matrix formalism. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361229
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  • 2
    Electronic Resource
    Electronic Resource
    Investigations of ferroelectric-to-paraelectric phase transition of vinylidenefluoride trifluoroethylene copolymer thin films by electromechanical interferometry (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 6367-6375 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electrostrictive and piezoelectric properties for a 1.3 μm thick film of a vinylidenefluoride/trifluoroethylene copolymer exhibiting a ferroelectric-to-paraelectric phase transition have been investigated as a function of temperature by means of electromechanical interferometry. The electrostriction remarkably increases in the vicinity of the phase transition temperature according to a sharp increase in the dielectric constant. For the unpoled sample in the ferroelectric phase with a polydomain structure in which the local spontaneous polarization is macroscopically cancelled out, the dependence of the electrostriction on the square of the applied electric field is nonlinear in the ferroelectric phase, while it is linear in the paraelectric phase. A theoretical model which takes into account the nonlinear dielectric constant can quantitatively explain the nonlinear contribution to the electrostriction in the vicinity of the ferroelectric–paraelectric phase transition, but it underestimates the contribution in the ferroelectric phase. Interactions within and/or between the ferroelectric domains in the polydomain structure are expected to contribute significantly to the nonlinear electrostriction. For poled samples a pronounced inverse-piezoelectric effect is measured. The achieved polarization and its temperature dependence are almost the same as for thicker films reported in earlier studies, obtained by different experimental techniques. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371699
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  • 3
    Electronic Resource
    Electronic Resource
    Microcavity devices based on a ladder-type poly(p-phenylene) emitting blue, green, and red light (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 608-610 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Light emitting devices with emission either in the blue, green, and red spectral region have been fabricated based on ladder-type poly(p-phenylene) (LPPP). Color tuning has been achieved simply by adjusting the LPPP layer thickness. Microcavity effects could be proven to control the shape of the electroluminescence and photoluminescence spectra of the single layer devices between aluminum and gold electrodes. The full width at half-maximum was strongly reduced from ∼150 to 200 nm for the "free space'' photoluminescence or for the electroluminescence spectra of devices with indium–tin oxide hole injecting electrodes to values between 60 and 70 nm for the three individual single color devices. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117922
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