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Photorefractive cyclometalated complexes

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Języki publikacji
EN
Abstrakty
EN
Some of the most recent results on the photoconducting and photorefractive properties of cyclometalated complexes are reviewed. Pure compounds show good photoconducting properties, which can be increased by orders of magnitude by doping with fullerenes. In addition, photorefractivity has been observed both in pure materials in their glassy state and in mixtures with inert polymers. In such mixtures, at high concentrations of complexes, dispersions of small (less than 200 nm) crystals of the complex within a polymeric matrix can be obtained. This morphology has been clearly linked to an increase in photorefractive performance, measured through diffraction efficiency, by orders of magnitude. Moreover, complexes with proper ligands exhibit chiral smectic mesophases with ferroelectric properties which also show photorefractive properties.
Twórcy
autor
  • Centro di Eccellenza CEMIF.CAL, Sezione INSTM della Calabria Laboratorio Regionale Licryl CNR-INFM, Italy
autor
  • Dipartimento di Chimica, Università della Calabria, 87030 Rende, Italy
autor
  • Dipartimento di Chimica, Università della Calabria, 87030 Rende, Italy
autor
  • Dipartimento di Chimica, Università della Calabria, 87030 Rende, Italy
autor
  • Dipartimento di Chimica, Università della Calabria, 87030 Rende, Italy
autor
  • Dipartimento di Chimica, Università della Calabria, 87030 Rende, Italy
autor
  • Dipartimento di Chimica, Università della Calabria, 87030 Rende, Italy
Bibliografia
  • 1. N.V. Joshi, Photoconductivity, Dekker, New York, 1990.
  • 2. P. Yeh, Introduction to Photorefractive Nonlinear Optics, Wiley, New York, 1993.
  • 3. L. Solymar, D.J. Webb, and A. Grunnet-Jepsen, The Physics and Applications of Photorefractive Materials, Clarendon, Oxford, 1996.
  • 4. G. Montemezzani, C. Medrano, M. Zgonik, and P. Günter, "The photorefractive effect in inorganic and organic materials", in Nonlinear Optical Effects and Materials, pp. 301-373, edited by P. Günter, Springer-Verlag, Berlin, 2000.
  • 5. B. Kippelen, K. Meerholz, and N. Peyghambarian, "An introduction to photorefractive polymers", in Nonlinear Optics of Organic Molecules and Polymers, pp. 465-513, edited by H.S. Nalwa and S. Miyata, CRC Press, Boca Raton, 1997.
  • 6. K. Sutter, P. Günter, "Photorefractive gratings in the organic crystal 2-cyclooctylamino-5-nitropyridine doped with 7,7,8,8-tetracyanoquinodimethane", J. Opt. Soc. Am. B7, 2274-2278 (1990).
  • 7. S. Ducharme, J.C. Scott, R.J. Twieg, and W.E. Moerner, "Observation of the photorefractive effect in a polymer", Phys. Rev. Lett. 66, 1846-1849 (1991).
  • 8. O. Ostroverkhova and W.E. Moerner, "Organic photorefractives: mechanisms, materials and applications", Chem. Rev. 104, 3267-314 (2004).
  • 9. I. Aiello, D. Dattilo, M. Ghedini, and A. Golemme, "Cyclometalated complexes: a new class of highly efficient photorefractive materials", J. Am. Chem. Soc. 123, 5598-5599 (2001).
  • 10. I. Aiello, D. Dattilo, M. Ghedini, A. Bruno, R. Termine, and A. Golemme, "Cyclopalladated complexes as photorefractive materials with high refractive index modulation", Adv. Mater. 14, 1233-1236 (2002).
  • 11. R. Termine, I. Aiello, D. Dattilo, M. Ghedini, and A. Golemme, "Photorefractive performance enhancement in polymer dispersions of nano-size crystalline domains", Adv. Mater. 15, 723-726 (2003).
  • 12. M. Ghedini, D. Pucci, E. Cesarotti, O. Francescangeli, and R. Bartolino, "Transition metals complexed to ordered mesophases XIII. Synthesis and mesomorphic properties of potentially ferroelectric Schiff's base Palladium(II) complexes", Liq. Cryst. 15, 331-344 (1993).
  • 13. D. Pucci, O. Francescangeli, and M. Ghedini, "Heteroligand palladium complexes with one or two chiral centres", Mol. Cryst. Liq. Cryst. 372, 51-68 (2001).
  • 14. M. Talarico, G. Barberio, D. Pucci, M. Ghedini, and A. Golemme, "Undoped photorefractive ferroelectric liquid crystal", Adv. Mater. 15, 1374-1377 (2003).
  • 15. R. Termine and A. Golemme, "Photorefractive index modulation in chiral smectic phases", J. Phys. Chem. B106, 4105-4111 (2002).
  • 16. M. Talarico, R. Termine, G. Barberio, D. Pucci, M. Ghedini, and A. Golemme, "Measurement of the photorefractive space-charge field in a ferroelectric mesogen", Appl. Phys. Lett. 84, 1034-1036 (2004).
  • 17. J.S. Schildkraut and A.V. Buettner, "Theory and simulation of the formation and erasure of space-charge gratings in photoconductive polymers", J. Appl. Phys. 72, 1888-1893 (1992).
  • 18. J.S. Schildkraut and Y. Cui, "Zero-order and first-order theory of the formation of space-charge gratings in photoconductive polymers", J. Appl. Phys. 72, 5055-5060 (1992).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BWA0-0004-0083
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