Current approaches on the light extraction technology of OLEDs are usually limited to single-color emission or rely on complicated,expensive equipment and process such as vacuum evaporation or lithographic procedures.Considering practical applications,it is essential that fabrication techniques must be applicable to a large area,multicolor (in case of white lighting) ,and cost effective.Hence,it is desirable to develop a simple fabrication technique for these out-coupling structures and study its effectiveness in terms of different colors.