In this thesis, we demonstrate a low reflection organic light-emitting device (OLED) with the reflectance of 7.32 % which is 10 times smaller than that of the control device by using the double metal configuration as the semi-transparent metal layer, and using a perylene derivative, as an absorption and interference layer. In addition to the good display characteristics and electrical performances of this low-reflection OLED, this device also exhibits the unusual photo-sensitive characteristics. Also, we study a new acceptor material, in the application of organic solar cell (OSC). With incorporating the donor material, pentacene, the highest power conversion efficiency of the OSC incorporates is 0.05% under the AM1.5 solar illumination.