Organic–Organic Heteroepitaxy—The Method of Choice to Tune Optical Emission of Organic Nano-fibers?

In this chapter the potential of Organic–Organic heteroepitaxy is discussed concerning the ability to provide efficient color tuning of organic nano-fibers deposited on muscovite mica substrates. The first part is focused on the epitaxial growth of rod-like molecules on sheet silicates which has been analyzed by depositing p-6P and 6T using hot-wall epitaxy. It is demonstrated that substituting para-phenylenes by other molecules for efficient color tuning is not trivial leading in the general case to multidirectional nano-fibers. The presented growth model is based on detailed analysis using XRD pole-figure measurements, atomic force microscopy and force-field simulations. In the second part it is demonstrated that organic–organic heteroepitaxy provides a proper method for efficient color tuning of organic nano-fibers. It is shown that using p-6P nano-fiber templates can be used as fundament for the epitaxial growth of 6T crystallites. The formed 6T crystallites adopt the molecular and morphological orientation of the p-6P layer beneath and provide highly polarized emission in the blue, green, and red spectral range.