The orientational photorefractive effects were observed in nematic liquid crystals deoped with electron donor and acceptor organic molecules. This kind of materials exhibits significantly their enhanced photorefractive performance. Two beam coupling and four wave mixing experiments are performed to characterize the photophysics of these novel materials. Polymer stabilization alters the charge transport and trapping characteristics of LCs, resulting in persistent lived gratings. Furthermore, the net photorefractive gain (Γ) of 441 cm -1 in two beam coupling, and the diffraction efficiency of 58% in four wave mixing were also measured.