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Proceedings Paper

Thermal, glass-forming, nonlinear optical and holographic properties of "push-pull" type azochromophores with triphenyl moieties containing isophorene and pyranylidene fragments
Author(s): Elmars Zarins; Andrejs Tokmakovs; Zane Kalnina; Valdis Kokars; Martins Rutkis; Andris Ozols; Peteris Augustovs; Kristine Lazdovica; Valdis Kampars
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Paper Abstract

Molecular organic compounds with electron donating fragment bounded through π-conjugated system with electron acceptor fragment, as well as with incorporated triphenyl groups in their molecules show potential for creating cheap and simple solution processable materials with nonlinear optical properties. Additional insertion of azobenzene fragment in their structures makes them also possible to form holographic volume and surface relief gratings (SRG) after exposure to laser radiation, which could be useful for holographic data storage. For these purposes polymers are generally used. However, their application is complicated and challenging task as in every attempt to obtain the same polymer it will have different physical properties. On the other hand, the synthetic procedure of molecular glasses is more simple as their structure and physical properties are strongly defined. Unfortunately, there is still no clear relation between compound organic structures and their thermal, glass-forming and optical properties.

In order to investigate the above mentioned regularities, we have synthesized and investigated ten molecular glassy organic compounds with three different fragments as main backbones of the molecules: indene-1,3-dione (WE-1, WE-2, WE-3), isophorene (IWK-1D, IWK-2M, IWK-2D) and pyranylidene (DWK-2TB, ZWK-2TB, JWK-2TB, ZWK-3AZO). Compounds containing isophorene fragment in their molecules had the highest NLO efficiencies (d33 up to 125.7 pm/V for IWK-2D) and also were the most effective holographic data storage compounds with holographic self diffraction efficiency 13% and holographic diffraction efficiency 20%, also for IWK-2D, but their thermal stability (Td from 288°C to 295°C) and glass transition (Tg from 90°C to 105°C) values were just average. Pyranylidene type compounds had the highest thermal stability and highest glass transition (Tg from 115°C to 180°C). But their ability to form and maintain amorphous structure were low and they had average NLO efficiencies (d33 up to 66.2 pm/V for ZWK-2TB) and average holographic self diffraction efficiency 2% and holographic diffraction efficiency 8% for ZWK-3AZO. The molecules with just azobenzene fragment and indene-1,3-dione as electron acceptor has the lowest thermal (Td from 250°C to 282°C, Tg from 70°C to 98°C) and also the lowest holographic properties with holographic diffraction and self diffraction efficiencies at 4% for WE-1 and lower for other compounds. Nevertheless, some of the investigated molecular glasses show potential as multifunctional optical materials.

Paper Details

Date Published: 6 March 2013
PDF: 12 pages
Proc. SPIE 8622, Organic Photonic Materials and Devices XV, 86221H (6 March 2013); doi: 10.1117/12.2003085
Show Author Affiliations
Elmars Zarins, Riga Technical Univ. (Latvia)
Andrejs Tokmakovs, Univ. of Latvia (Latvia)
Zane Kalnina, Univ. of Latvia (Latvia)
Valdis Kokars, Riga Technical Univ. (Latvia)
Martins Rutkis, Univ. of Latvia (Latvia)
Andris Ozols, Riga Technical Univ. (Latvia)
Peteris Augustovs, Riga Technical Univ. (Latvia)
Kristine Lazdovica, Riga Technical Univ. (Latvia)
Valdis Kampars, Riga Technical Univ. (Latvia)

Published in SPIE Proceedings Vol. 8622:
Organic Photonic Materials and Devices XV
Christopher E. Tabor; François Kajzar; Toshikuni Kaino; Yasuhiro Koike, Editor(s)

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