Abstract: The present invention describes new organic light emitting devices (OLED) based on dendritic and hyperbranched materials with cascade, tree-like architecture. It suggests special design of highly emissive dendrimers with lanthanide (Ln3+) ions (for example, Eu3+/Tb3+) in their core providing efficient light harvesting similar to bacteriorhodopsine and other natural photosynthetic systems. The proposed design has a number of advantages with respect to known electro-luminescence devices. Color of the light emission can be controlled by proper selection of the core, whereas special surface groups can provide good solubility of the material, which is extremely important for spin cast fabrication of the sandwich devices. In order to prevent lanthanide (Ln3) aggregation leading to self-quenching processes the Ln3+ ions are surrounded by dendritic shell.