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  • 1
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    Ultrafast intersystem-crossing in platinum containing π-conjugated polymers with tunable spin-orbit coupling (2013)
    Springer Nature
    Details
    Publication Date: 2013-09-14
    Description: The development of efficient organic light-emitting diodes (OLED) and organic photovoltaic cells requires control over the dynamics of spin sensitive excitations. Embedding heavy metal atoms in π-conjugated polymer chains enhances the spin-orbit coupling (SOC), and thus facilitates intersystem crossing (ISC) from the singlet to triplet manifolds. Here we use various nonlinear optical spectroscopies such as two-photon absorption and electroabsorption in conjunction with electronic structure calculations, for studying the energies, emission bands and ultrafast dynamics of spin photoexcitations in two newly synthesized π-conjugated polymers that contain intrachain platinum (Pt) atoms separated by one (Pt-1) or three (Pt-3) organic spacer units. The controllable SOC in these polymers leads to a record ISC time of 〈~1 ps in Pt-1 and ~6 ps in Pt-3. The tunable ultrafast ISC rate modulates the intensity ratio of the phosphorescence and fluorescence emission bands, with potential applications for white OLEDs. Scientific Reports 3 doi: 10.1038/srep02653
    Electronic ISSN: 2045-2322
    Topics: Natural Sciences in General
    Published by Springer Nature
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  • 2
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    Magnetic field effects in hybrid perovskite devices (2015)
    Springer Nature
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    Publication Date: 2015-05-01
    Description: Nature Physics 11, 427 (2015). doi:10.1038/nphys3277 Authors: C. Zhang, D. Sun, C-X. Sheng, Y. X. Zhai, K. Mielczarek, A. Zakhidov & Z. V. Vardeny
    Print ISSN: 1745-2473
    Electronic ISSN: 1745-2481
    Topics: Physics
    Published by Springer Nature
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  • 3
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    Nuclear relaxation measurements in organic semiconducting polymers for application to organic spintronics (2015)
    American Physical Society (APS)
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    Publication Date: 2015-01-29
    Description: Author(s): E. F. Thenell, M. E. Limes, E. G. Sorte, Z. V. Vardeny, and B. Saam NMR measurements of spin-lattice relaxation of hydrogen nuclei in two prototype organic semiconducting solids, MEH-PPV and DOO-PPV, were carried out for temperatures between 4.2 K and room temperature, and for applied magnetic fields between 1.25 and 4.7 T. These π-conjugated polymers are of interes... [Phys. Rev. B 91, 045205] Published Wed Jan 28, 2015
    Keywords: Semiconductors I: bulk
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Ultrafast optical studies of ordered poly(3-thienylene-vinylene) films (2012)
    American Physical Society (APS)
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    Publication Date: 2012-06-13
    Description: Author(s): E. Olejnik, B. Pandit, T. Basel, E. Lafalce, C.-X. Sheng, C. Zhang, X. Jiang, and Z. V. Vardeny Using femtosecond transient photomodulation, photoluminescence, and electro-absorption spectroscopies, we studied the ultrafast photoexcitation dynamics and nonlinear optical properties of ordered poly(thienylene-vinylene) (PTV), which belongs to a rare class of nonluminescent, nondegenerate-ground-... [Phys. Rev. B 85, 235201] Published Tue Jun 12, 2012
    Keywords: Semiconductors I: bulk
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 5
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    Evidence for excimer photoexcitations in an ordered π-conjugated polymer film (2011)
    American Physical Society (APS)
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    Publication Date: 2011-04-29
    Description: Author(s): K. Aryanpour, C.-X. Sheng, E. Olejnik, B. Pandit, D. Psiachos, S. Mazumdar, and Z. V. Vardeny We report pressure-dependent transient picosecond and continuous-wave photomodulation studies of disordered and ordered films of 2-methoxy-5-(2-ethylhexyloxy) poly(para-phenylenevinylene). Photoinduced absorption (PA) bands in the disordered film exhibit very weak pressure dependence and are assigne... [Phys. Rev. B 83, 155124] Published Thu Apr 28, 2011
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 6
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    Two-dimensional electronic excitations in self-assembled conjugated polymer nanocrystals (2000)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2000-02-05
    Description: Several spectroscopic methods were applied to study the characteristic properties of the electronic excitations in thin films of regioregular and regiorandom polythiophene polymers. In the regioregular polymers, which form two-dimensional lamellar structures, increased interchain coupling strongly influences the traditional one-dimensional electronic properties of the polymer chains. The photogenerated charge excitations (polarons) show two-dimensional delocalization that results in a relatively small polaronic energy, multiple absorption bands in the gap where the lowest energy band becomes dominant, and associated infrared active vibrations with reverse absorption bands caused by electron-vibration interferences. The relatively weak absorption bands of the delocalized polaron in the visible and near-infrared spectral ranges may help to achieve laser action in nanocrystalline polymer devices using current injection.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Osterbacka -- An -- Jiang -- Vardeny -- New York, N.Y. -- Science. 2000 Feb 4;287(5454):839-42.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Physics Department, University of Utah, Salt Lake City, UT 84112, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10657294" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 7
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    Organic electronics. Room-temperature coupling between electrical current and nuclear spins in OLEDs (2014)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2014-09-23
    Description: The effects of external magnetic fields on the electrical conductivity of organic semiconductors have been attributed to hyperfine coupling of the spins of the charge carriers and hydrogen nuclei. We studied this coupling directly by implementation of pulsed electrically detected nuclear magnetic resonance spectroscopy in organic light-emitting diodes (OLEDs). The data revealed a fingerprint of the isotope (protium or deuterium) involved in the coherent spin precession observed in spin-echo envelope modulation. Furthermore, resonant control of the electric current by nuclear spin orientation was achieved with radiofrequency pulses in a double-resonance scheme, implying current control on energy scales one-millionth the magnitude of the thermal energy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Malissa, H -- Kavand, M -- Waters, D P -- van Schooten, K J -- Burn, P L -- Vardeny, Z V -- Saam, B -- Lupton, J M -- Boehme, C -- New York, N.Y. -- Science. 2014 Sep 19;345(6203):1487-90. doi: 10.1126/science.1255624. Epub 2014 Sep 18.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics and Astronomy, University of Utah, Salt Lake City, UT 84112, USA. hmalissa@physics.utah.edu john.lupton@ur.de boehme@physics.utah.edu. ; Department of Physics and Astronomy, University of Utah, Salt Lake City, UT 84112, USA. ; Centre for Organic Photonics & Electronics, School of Chemistry and Molecular Biosciences, The University of Queensland, Queensland 4072, Australia. ; Department of Physics and Astronomy, University of Utah, Salt Lake City, UT 84112, USA. Institut fur Experimentelle und Angewandte Physik, Universitat Regensburg, 93053 Regensburg, Germany. hmalissa@physics.utah.edu john.lupton@ur.de boehme@physics.utah.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25237097" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 8
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    High-Field Magnetoresistance of Organic Semiconductors (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-08-10
    Description: Author(s): G. Joshi, M. Y. Teferi, R. Miller, S. Jamali, M. Groesbeck, J. van Tol, R. McLaughlin, Z. V. Vardeny, J. M. Lupton, H. Malissa, and C. Boehme Understanding the microscopic origins of magneto-optoelectronic effects in organic semiconductors (as in the magnetoresistance of an OLED) is crucial to their technological application in magnetometers and other sensors. Here the magnetoresistance of a common conjugated polymer at low temperature and high magnetic field is studied, and contrasted with insight gained from magnetic resonance spectroscopy of charge-carrier pairs under identical conditions. These results imply that the high-field magnetoconductance is dominated by spin-orbit coupling, even though this compound contains only low- Z elements. [Phys. Rev. Applied 10, 024008] Published Thu Aug 09, 2018
    Electronic ISSN: 2331-7019
    Topics: Physics
    Published by American Physical Society (APS)
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  • 9
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    Spin-polarized light-emitting diode based on an organic bipolar spin valve (2012)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2012-07-17
    Description: The spin-polarized organic light-emitting diode (spin-OLED) has been a long-sought device within the field of organic spintronics. We designed, fabricated, and studied a spin-OLED with ferromagnetic electrodes that acts as a bipolar organic spin valve (OSV), based on a deuterated derivative of poly(phenylene-vinylene) with small hyperfine interaction. In the double-injection limit, the device shows ~1% spin valve magneto-electroluminescence (MEL) response, which follows the ferromagnetic electrode coercive fields and originates from the bipolar spin-polarized space charge-limited current. In stark contrast to the response properties of homopolar OSV devices, the MEL response in the double-injection device is practically independent of bias voltage, and its temperature dependence follows that of the ferromagnetic electrode magnetization. Our findings provide a pathway for organic displays controlled by external magnetic fields.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nguyen, Tho D -- Ehrenfreund, Eitan -- Vardeny, Z Valy -- New York, N.Y. -- Science. 2012 Jul 13;337(6091):204-9. doi: 10.1126/science.1223444.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics and Astronomy, University of Utah, Salt Lake City, UT 84112, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22798608" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 10
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    Organic magnetoresistance near saturation: Mesoscopic effects in small devices (2013)
    American Physical Society (APS)
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    Publication Date: 2013-08-30
    Description: Author(s): R. C. Roundy, Z. V. Vardeny, and M. E. Raikh In organic light-emitting diodes with small area the current may be dominated by a finite number, N , of sites in which electron-hole ( e -h) recombination occurs. As a result, averaging over the hyperfine magnetic fields, b h , that are generated in these sites by the environment nuclei is incomplete. T... [Phys. Rev. B 88, 075207] Published Thu Aug 29, 2013
    Keywords: Semiconductors I: bulk
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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