Organic semiconductors based on oligo-acenes represent a promising class of electro-active materials, which can be easily incorporated in organic thin film transistors, organic light-emitting diodes (OLEDs) and organic photovoltaic cells. A dispersion of 6,13-diphenyl pentacene (DPP) in an organic host film has a sharp red emission centered around 625 nm and a solid state fluorescence quantum yield (f_PL) of ~ 0.30. When incorporated as the active emissive layer in an OLED, it emits in the red with an electroluminescence (EL) quantum efficiency close to the theoretical limit. A novel asymmetrically substituted pentacene derivative, namely 5,6,13,14-tetraphenyl pentacene (ATPP), designed as a red emitter with a higher f_PL than that of DPP was synthesized and spectroscopically characterized. ATPP was prepared via cycloaddition of 1,3-diphenylnaphtho[2,3-c]furan and 1,4-naphthoquinone, in order to construct the asymmetric functionalized pentacene moiety. Here we report the electronic and optical properties of this recently synthesized novel pentacene derivative both in solutions and in the solid state. The device performance of OLEDs (EL quantum efficiencies and current-voltage-luminance characteristics) using this new pentacene derivative as a red emitter will be presented.