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Janah Shaya

Janah Shaya

IPCMS, Strasbourg

Title: Towards High Performance Solvent-free Fluidic Devices

Biography

Biography: Janah Shaya

Abstract

Solvent-free fluidic optoelectronics constitute a milestone research area that aims at fabrication of ultimate stretchable and flexible devices. The advantages of such non-volatile liquid optoelectronic materials compared to conventional solid-state ones are many i) intrinsic resilience, ii) excellent pore filling ability, iii) solvent-free processing, and iv) possibility to compensate for the degradation (via microfluidic technology), by supplying the device with fresh liquid.

In our lab, we have developed an efficient methodology to confer large aromatic species with a liquid state at room temperature, via functionalization by siloxane chains. A series of emitters and semiconductors and their applications have been executed including their investigations in OLEDs and solar cells. Among the reported results, oligofluorenes led to solvent-free liquid compounds that exhibit both remarkable charge transport properties and strong fluorescence.[3] The materials were found to exhibit ambipolar charge transport properties (hole- and electron-transport) with mobilities of about 10-4 cm2/Vs, i.e. a value comparable to the one of the best solid-state amorphous glasses used in various optoelectronic applications. These components allowed to realize the first distributed feedback (DFB) laser in a monolithic liquid semiconductor, given their high quantum yields (PLQY > 80 %) and extremely low threshold amplified stimulated emission (< 2 J/cm2).

Overall, these results demonstrate that solvent-free liquid organic semiconductors functionalized by siloxane segments can compete in terms of photophysical and charge transport properties with organic glassy semiconductors, thus paving the way for the development of liquid optoelectronic devices.

Further, the optimization of the metal-catalyzed methodologies and the design of the optimal siloxane chains (length, branching, etc.) to synthesize liquid hosts at room temperature are illustrated based on various families such as carbazolebiphenyl derivatives

Image:

 

Figure. Photograph (at ambient and under UV light) of the strongly luminescent oligofluorene derivative functionalized with short siloxane chains, showing nonvolatile and stable liquid state at room-temperature. Graph (right) showing the temperature dependence of the ambipolar charge transport mobility, with typical recorded ToF signal in the insert.


Recent Publications:

  1. J.-C. Ribierre, L. Zhao, M. Inoue, P.-O. Schwartz, J.-H. Kim, K. Yoshida, A.S.D. Sandanayaka, H. Nakanotani, L. Mager, S. Méry, C. Adachi, Chem. Commun. 2016, 52, 3103
  2. J. Shaya, F. Fontaine-Vive, B. Y. Michel, A. Burger, “Rational design of push-pull fluorene dyes: synthesis and structure-photophysics relationship”, Chem. Eur. J. 2016, 22, 10627-10637.
  3. J. Shaya, M.-A. Deschamps , B. Y. Michel, A. Burger, “Air-stable palladium catalytic systems for sequential one-pot synthesis of challenging unsymmetrical aminated products”, J. Org. Chem. 2016, 81, 7566-7573.
  4. P.M. Holstein, D. Dailler, J. Vantourout, J. Shaya, A. Millet, O. Baudoin, “Synthesis of Strained γ-Lactams by Palladium(0)-Catalyzed C(sp3)–H Alkenylation and Application to Alkaloid Synthesis”, Angew. Chem. Int. Ed. 2016, 55, 1–6.
  5. N. P.F. Barthes, B. Y. Michel, J. Shaya, N. Martinet, A. Burger, “Génétique et épigénétique: Un code au-dessus du code”, Journal de la société chimique de France, 2016, 412, 20-27.