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  • 1
    Electronic Resource
    Electronic Resource
    Efficient optical parametric generation in an organomineral crystal (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 2019-2021 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Organomineral crystals are engineered to combine the favorable properties of organic and inorganic materials. High gain parametric emission and amplification at telecommunications wavelengths are demonstrated in an organomineral crystal, 2-amino-5-nitropyridinium-dihydrogen phosphate. A novel angle-noncritical type-II phase-matching configuration is observed in parametric emission, and parametric amplification is demonstrated at 1.5 μm. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.113678
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  • 2
    Electronic Resource
    Electronic Resource
    Low threshold and broad tunability of an organic optical parametric oscillator (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 3655-3657 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Optical parametric oscillation in the molecular organic crystal NPP [N-(4-nitrophenyl)-L-prolinol] is reported at a pumping wavelength of 670 nm with pulse duration of 60 ns, and improved performance over the earlier demonstration at 592.7 nm pump wavelength (pulse duration 1 ns). The pumping scheme is simplified, the oscillation threshold substantially decreased by more than an order of magnitude to 0.5 MW/cm2, with the benefit of an increasingly wavelength noncritical configuration as the pump wavelength is shifted towards the infrared.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111171
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  • 3
    Electronic Resource
    Electronic Resource
    Broadband pump wavelength tuning of a low threshold N-(4-nitrophenyl)-L prolinol near infrared optical parametric oscillator (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 3841-3843 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the pump wavelength tuning of a low threshold N-(4-nitrophenyl)-L-prolinol based nanosecond pulsed optical parametric oscillator in the near infrared. A broad tuning range from 1 to 1.5 μm corresponds to a limited pump wavelength excursion from 583 to 590 nm and a record low oscillation threshold of the order of 0.5 MW cm−2. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.115291
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  • 4
    Electronic Resource
    Electronic Resource
    Broadband optical amplifier based on a conjugated polymer (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 80 (2002), S. 3036-3038 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We demonstrate a compact, broadband optical amplifier using the conjugated polymer poly[2-methoxy-5-(2′,6′-dimethyloctyloxy)-paraphenylenevinylene] (OC1C10–PPV) in dilute solution. Gains of 30–40 dB in a wavelength range of 575–640 nm, corresponding to a 50 THz bandwidth, are observed due to the broad luminescence spectrum and large cross section for stimulated emission of the polymer. The variation in gain as a function of solution concentration and probe intensity is examined. For a 1 cm path length we observe a small signal gain of 44±1 dB, and deduce a stimulated emission cross-section for OC1C10–PPV of (5.3±0.6)×10−17 cm2. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1472479
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  • 5
    Electronic Resource
    Electronic Resource
    Experimental determination of conjugation lengths in long polyene chains (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 6248-6252 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Since the low energy absorption spectrum of a linear polyene is dominated by the strongly allowed 1 1Ag→1 1Bu transition (S0 to S2), it can be reconstructed for any chain length if the 0–0 band excitation energy, the band profile, and intensity are known. From this premise, this paper uses information developed in high resolution experiments on well-defined linear polyenes to extract the distribution of effective conjugation lengths from absorption spectra of solutions of long linear polyenes. These distributions are found to be dominated by short conjugation lengths. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470402
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  • 6
    Electronic Resource
    Electronic Resource
    Protonation effects on the photophysical properties of poly(2,5-pyridine diyl) (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 10372-10378 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have recently shown that poly(2,5-pyridine diyl) (PPY) can be synthesized to yield a polymer with high photoluminescence quantum yield (PLQY) in the solid state, and that it is an excellent electron transport material. To explore the photophysical properties of PPY further, we have used a range of acidic "dopants" to protonate the nitrogen sites on each ring and made observations on how this affects the optical properties of the resultant protonated PPY films. In general, we find that sulphonic acids have the greatest effect, causing perturbations to both the ground-state and excited-state properties of the PPY. These changes occur with only moderate reduction of the PLQY, whereas nonsulphonic acids cause a larger reduction in PLQY without significantly affecting the ground- or excited-state energy levels. These aspects of the photophysics of PPY can be described using a simple ring torsion argument. This model can also account for the observed shifts between solution state and solid-state emission wavelengths. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.477692
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  • 7
    Electronic Resource
    Electronic Resource
    Exciton confinement in organic dendrimer quantum wells for opto-electronic applications (2002)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 116 (2002), S. 455-459 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Organic dendrimers are a fascinating new class of materials for opto-electronic applications. We present coupled electronic oscillator calculations on novel nanoscale conjugated dendrimers for use in organic light-emitting diodes. Strong confinement of excitations at the center of the dendrimers is observed, which accounts for the dependence of intermolecular interactions and charge transport on the degree of branching of the dendrimer. The calculated absorption spectra are in excellent agreement with the measured data and show that benzene rings are shared between excitations on the linear segments of the hyperbranched molecules. The coupled electronic oscillator approach is ideally suited to treat large dendritic molecules. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1431542
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  • 8
    Electronic Resource
    Electronic Resource
    Display technology Sidestepping the selection rules (2000)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 403 (2000), S. 710-711 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Organic semiconductors that can emit light have developed rapidly over the past decade. These materials offer the prospect of flat, and even flexible, displays that operate at low voltage and emit light, giving excellent contrast and viewing angle. The displays use light-emitting diodes (LEDs) ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35001688
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