Third-order nonlinear optical properties and two-photon absorption in branched oligothienylenevinylenes

Fuks-Janczarek, I.; Nunzi, Jean‐Michel; Sahraoui, B.; Kityk, I.V.; Berdowski, J.; Caminade, Anne‐Marie; Majoral, Jean‐Pierre; Martineau, A. C.; Frère, Pierre; Roncali, Jean

doi:10.1016/s0030-4018(02)01686-3

Cited by 64 publications

(31 citation statements)

References 18 publications

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“…[11] In order to enhance the non-resonant third order NLO response of fullerenes and to tune their optical properties in specific spectral regions of interest, C 60 and C 70 have been chemically modified with a large variety of electron-donating organic moieties. [12][13][14][15][16][17][18][19][20] In that respect, the enhancement of the charge delocalization over the fullerene cage in connection with charge transfer have been shown to be an efficient source to enhance the thirdorder optical nonlinear response of fullerene derivatives. Specifically, evidence for the enhancement of the nonlinear optical behaviour as a consequence of the charge transfer interaction has been observed with C 60 -poly(aminonitrile) polymers and a [2+4]-adduct with a Cu-phthalocyanine.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Optical Properties of Ferrocene‐ and Porphyrin–[60]Fullerene Dyads

et al. 2007

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A series of novel [60]fullerene-ferrocene and [60]fullerene-porphyrin dyads, in which a fullerene and an electron donating moiety are attached through a flexible triethylene glycol linker are synthesized and their nonlinear optical (NLO) response studied. Specifically, the third-order susceptibility chi(3) of all fullerene derivatives are measured in toluene solutions by the optical Kerr effect (OKE) technique using 532 nm, 35 ps laser pulses and their second hyperpolarizability gamma are determined. All fullerene dyads studied exhibit enhancement of their NLO response compared to pristine fullerenes which has been attributed to the formation of a charge separated state. All experimentally measured hyperpolarizability gamma values are also calculated by the semiempirical methods AM1 and PM3. A good correlation is found between the theoretical and experimental values, suggesting that simple semiempirical methods can be employed for the designing and optimization of the fullerene-containing dyads displaying improved nonlinear responses.

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Section: Introductionmentioning

confidence: 99%

Nonlinear Optical Properties of Ferrocene‐ and Porphyrin–[60]Fullerene Dyads

et al. 2007

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“…These oligomeric compounds have, however, too short conjugation length in order to be effective as semiconducting material in FETs, as follows from the results presented here. Branched oligothienylvinylenes [17] reported recently could be more promising in this respect if the right molecular packing can be achieved. Branched-and starbranched poly(3-alkylthiophenes) reported earlier definitely have a longer conjugation length than the star-shaped oligomers considered here, but they were investigated in their conducting (doped) states only.…”

Section: Introductionmentioning

confidence: 99%

Star‐Shaped Oligothiophenes for Solution‐Processible Organic Field‐Effect Transistors

Ponomarenko

Kirchmeyer²,

Elschner

et al. 2003

Adv Funct Materials

195

115

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We have designed and successfully synthesized star‐shaped oligothiophenes, which could be used as semiconducting materials for solution‐processible organic field‐effect transistors (FETs). By systematically changing the chemical structure of the star‐shaped oligothiophenes we obtained the structural requirements needed for making working FETs from them. UV‐vis fluorescence measurements showed that a molecule of the star‐shaped compounds under consideration is not a fully conjugated molecule, but it has three independently conjugated oligothienyl‐phenylene blocks. A possible scheme of molecular packing of the star‐shaped oligothiophenes in a lamellar structure was proposed and confirmed by atomic force microscopy (AFM) and X‐ray diffraction (XRD) measurements. Although the star‐shaped semiconductors show a somewhat lower mobility than their linear analogs, they possess better solubility and film‐forming properties, leading to improved spin‐coating processing. The best FETs were made by spin‐coating 1,3,5‐tris(5″‐decyl‐2,2′:5′,2″‐terthien‐5‐yl)benzene from a chloroform solution, which resulted in a mobility of 2 × 10–4 cm2 V –1s–1, a 102 on/off ratio at gate voltages of 0 V and –20 V, and a threshold voltage close to 0 V.

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“…11.027 1386-1425/Ó 2014 Elsevier B.V. All rights reserved. like third harmonic generation, four-wave mixing and optical limiting have received great deal of attraction [3]. Especially in this modern world, the use of continuous wave (cw) lasers at power levels ranging from mW to kW in various applications has become more common.…”

Section: Introductionmentioning

confidence: 99%