Self-organized Nanostructures of Optically Active Materials

The self-organized formation of a regularly nano-patterned light source with possible properties of a distributed feedback (DFB) laser is studied. To this end, the self-organized formation of 2-dimensional photonic crystals from colloidal particles on suitable solid surfaces is investigated. The filling of fluorescent materials within the open spaces of such colloidal crystals is examined, along with the emission properties of the light emitter and the light propagation modes in the photonic crystal. The aim is to achieve strong emission in the visible to UV range of the spectrum and single-mode extraction at specific wavelengths determined by the periodicity of the photonic crystal. Based on the experience with such systems, attempts will be made to replace the fluorescent material by organic LED structures, which can be electrically contacted and operated.