Second order nonlinear optical networks with excellent poling stability from a new trifunctional thiophene based chromophore

作者：Borbone Fabio; Caruso Ugo; Diana Rosita; Panunzi Barbara^*; Roviello Antonio; Tingoli Marco; Tuzi Angela

来源：Organic Electronics, 2009, 10(1): 53-60.

DOI：10.1016/j.orgel.2008.10.004

• Thiophene dye
• NLO properties
• Crosslinked material

Two new trifunctional thiophene based dyes suited for crosslinking were synthesised from the same structural core, i.e. 4-[[5-[(4-nitrophenyl)azo]-2-thienyl]azo]benzenamine. Crystal structure and second order nonlinear optical properties were determined on a related difunctional dye that can be considered as a representative and simplified model of the trifunctional compounds, determining on it the mu beta value of 4950 x 10(-48) esu (6111 x 10(-80) C(2) m(4) V(-2)).
The presence of three acrylic or hydroxyl functional groups in the dyes allowed to incorporate the chromophoric fragment into two different kinds of crosslinked materials possessing "frozen" long-lasting dipole order. The traditional guest-host approach used for one of them was exceeded by covalently anchoring the chromophore to a functionalised polymer in a three-dimensional unique network. In this way a promising NLO active material was obtained. The value of the d(33) coefficient (determined by SHG measurement using the Maker fringe technique) was 11 pm/V for the poled/crosslinked film. Very good thermal and temporal stability of the chromophore poling-induced dipole alignment was attained.

• 出版日期2009-2