Self-Assemble Properties of Poly(phenylene vinylene) Derivatives and Polarized Light Emitting Diodes Fabricated Using Friction Transferred Surfaces
01 January 2000
In this paper, we report the syntheses and characterizations of a number of poly(phenylene vinylene) derivatives substituted with dendritic sidechains and their self-assemble properties. In addition, we report the application of friction transferred poly(tetrafluorethylene) (PTFE) for aligning active materials to obtain polarized light-emitting devices. A variety of materials, such as vacuum evaporated small molecules and solution processable conjugated polymers, are easily aligned on friction transferred PTFE. Detailed studies of the effects of molecular structure and shape on the induced alignment will be discussed. Polarized LEDs fabricated on such surfaces showed high dichroic ratios. The device performance can be optimized by introducing a conducting poly(3,4-ethylene-dioxythiophene) (PEDOT) layer to help improve the charge injection and wetting properties. Addition of an electron-transporting layer can further increase the external efficiences of the polarized LED devices.