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Organic materials have been given much attention due to their intriguing properties that can be tailored via
synthetic chemistry tor specific applications combined with their low price and fairly straight-forward large-
scale synthesis. Para-hexaphenylene (p6P) nanofibers emit polarized light with a highly anisotropic
emission profile, act a sub-wavelength optical waveguides, and form the basis tor a new type of miniature
OLEDs. However, p6P molecules suffer reduction of luminescence intensity during photoexcitation under
UV light. Such photoreaction is understood as a consequence of the interaction of the fibers with oxygen.
We have developed a bilayer coating that does not change significantly the p6P spectrum but strongly
reduces bleaching. This bilayer coating consists of a first layer of a stable polymer (PMMA) on top of the
organic nanofibers as a protecting layer tor avoiding modifications of the p6P luminescence spectrum and
as a second layer SiOx tor blocking the oxygen penetration. In this work, we show the applicability of this
bilayer coating of PMMA/SiOx in prolonging the operationallifetime of field-effect transistor (FET) devices
based on p6P nanofibers. The coating prevents strang degradation of transferred nanofibers on FET
platforms during electrical biasing as is observed tor uncoated devices. We are currently investigating the
effect of, the coating during electrically stimulated light emission experiments tram transferred fibers on
transistor platforms.