Organic electronics are one of the future technologies of these days. It offers many advantages in comparison to heavy metal based inorganic electronics. For example, organic electronics are available in various colors, are often semitransparent, they can be fully solution processed and thus allow printing on top of rigid as well as on flexible substrates. All these characteristics enable a complete new area of applications for electronics. For example, the integration of semitransparent photovoltaic or light emitting diodes into windows, printed batteries, sensors directly pasted on the skin, flexible displays and much more. With the utilization of light management within such products, the device efficiency and / or its functionality can be further improved. The aim of this work was to realize fully-printed dielectric mirrors and subsequently to integrate them into printed organic electronics. Dielectric mirrors are also known as one dimensional photonic crystals, Bragg reflectors, dichroic filters, or interference filters and are mainly processed via vacuum based coating technologies. Such mirrors reflect light only in a certain wavelength regime, while in the other regions high transmittance is obtained. Their working principle is based on thin film interferences at dielectric layers. Depending on the position and the width of the maximum reflectance signal with respect to the visible region, such mirrors can be either transparent, semitransparent or non-transparent. Then, a short introduction about the different types of photonic crystals, their stage of development and their application in organic photovoltaic is given. After that, the optical fundamentals of dielectric mirrors as well as the working principle of organic photovoltaic and organic light emitting diodes is discussed in the theoretical part of this thesis. A much more detailed description about the state of the art of dielectric mirrors and their application in photovoltaic and organic light emitting diodes is provided in chapter 3. Next, ...