Organic photorefractive polymer based in a nonlinear optical chromophore boronate derivative

Abstract

The preparation and characterization of organic photorefractive polymer composites derived from (2-(p-chlorophenyl)-(3'-nitrobenzo[d])-(4''-methoxybenzo[h])-1,3-dioxa-6-aza-2-boracyclonon-6-ene, a push-pull boronate, which shows NLO properties, are described. The polymers are based in the photoconductor poly(9-vinylcarbazole) and the plasticizer 9-ethylcarbazole PVK:ECZ matrix, and C 60 as sensitizer. For the photorefractive performance, two different chromophore concentrations were used, in addition, the ratio of PVK:ECZ was varied to see the effect on the room temperature molecular orientation. Holographic experiments in a tilted four and two wave mixing geometry were performed by using a 10 mW He-Ne laser (632.8 nm). The experiments were performed at room temperature, with a fixed grating spacing Λ of 2.9 µm, for determining the electric field steady-state diffraction efficiency dependency and the optical gain of the composites. Acceptable photorefractive properties were observed for a polymer with a glass transition temperature T g of 77 °C. Even at this T g , the response time was less than one second.

Effect of doping with C60 on photocurrent and hole mobility in polymer composites measured by using the time-of-flight technique

“…The large carrier mobilities that some of these organic materials exhibit combined with their peculiar optical and mechanical properties have led to other applications such as electroluminescent devices (OLEDs) [4][5][6], photovoltaic cells [7,8] and photorefractive systems [9][10][11]. In these applications, the conducting polymers are combined with other organic molecules or with metallic electrodes.…”