Alex K.-Y. Jen

TL;DR: In this article, a modular approach for making second-order nonlinear optical (NLO) side-chain aromatic polyquinolines has been developed, which provides a method for readily incorporating NLO chromophores into the pendent phenyl moieties of parent polyquinoline at the final stage via the Mitsunobu reaction.

TL;DR: In this paper, the poling of an electro-optic polymer/TiO2 multilayer waveguide modulator on mesoporous sol-gel silica cladding is described.

TL;DR: In this article, new designs for silicon-polymer hybrid slot waveguide based electro-optic modulators are presented, along with new device results for ring and MZI based modulators and for slot waveguides.

Abstract: Polyfluorenes are a class of very efficient conjugated polymers used in the development of LEDs that exhibit very high hole mobility. In order to balance the charge transport and enhance quantum efficiency of the LEDs, fluorene-based copolymers were synthesized based on the statistic copolymerization between fluorene and 2,5-dicyanobezene. By attaching two electron-withdrawing cyano groups onto the phenylene ring, both the electron affinity and the electron conduction of these copolymers are greatly enhanced comparing to the fluorene homopolymer. LED devices using the cyano-containing fluorene copolymers show very bright emission and low turn-on voltages. The emission color of these polymers could be also tuned by exciplex formation between the polymers and amine-containing hole transporting materials.