Synthesis And Properties Studies Of Second-order Nonlinear Optical Poled Polymer

Poled polymers are more advantageous for high quality electro-optic devices, compared to traditional inorganic materials. Great progresses were made on the studies of poled polymers EO materials in the past two decades. Currently the major studies direction is the materials with practicality, many problem will be faced with for making poled polymers EO materials of widely practice use. In the current condition of Optoelectronic technology, how to optimize integrated performance is large challenge for design, Synthesis and practicality of poled polymers EO materials.To obtain device-quality poled polymers EO materials, high stability must be addressed in addition to large electro-optic coefficient. Effecting of optical loss of materials for design and processing of devices must be considered. Although the studies of this aspect have great progress and high quality electro-optic modulator has been reported, materials have not far achieved the need of practicality. Preparation of poled polymers EO materials with practicality needs optimization to every step from choice of materials.μβvalue and heat stability of chromophore must be improved, Specifically structure will be designed to minimize intermolecular electrostatic interactions among chromophores, appropriate polymer system will be selected and designed, EO coefficient and stability of materials will be improved.We selected epoxy resin polymer to prepare the poled polymers EO materials for devices with practicality, designed chromophores with different donor and acceptor, all could be summarized as:1 Polymer BPAN for poled polymer was made from epoxy resin and aniline, the relation between reaction condition and film-forming property was discussed to achieve the need of film as poled polymers EO materials. This polymer contains many hydroxyl groups which can further react with cross-linking agent to form crosslinking system.2 The side-chain epoxy resin polymer BPAN-C1 was prepared by incorporating chromophore to the backbone of BPAN polymer and BPAN-2N was prepared by incorporating chromophore with post-function method. Content of chromophore in two polymers are 7% and 40% respectively. Cross-linking agent was be used to prepare the poled polymer P1 based on the side-chain polymer BPAN-C1. The chromophore content and stability of poled polymer P1 were improved because of introducing cross-linking agent containing chromophore and film-forming property was not destroyed. EO coefficient of P1 is 6.7pm/V with the Attenuation Total Reflection (ATR) method. EO coefficient of polymer BPAN-2N is 10.1pm/V with Simple Reflection Method.3 Two chromophores were synthesized. One is diazothiophene chromophore with diarylaminophenyl-containing donor and TCF acceptor, in which diarylaminophenyl-containing donor could largely improved stability of chromophore. It's peak of UV-Vis spectrum is at 715nm. Another is diazothiophene chromophore with dialkylaminophenyl-containing donor protected by tert-Butyldimethylsilyl (TBDMS) and TCP acceptor. TCP acceptor has the stronger ability of absorbing electron than TCF acceptor, UV-Vis pectrum absorption peak of chromophore is at 804nm.