In this paper, we comparatively investigate the influence of absolute photoluminescence quantum yield (PLQY) and molecular orientation of a series of wide-energy-gap donors, which are usually used in organic light-emitting diodes, on the performance of organic Schottky junctions (OSJs) with low donor concentration. This work shows that PLQY of donors plays a crucial role on the photocurrent and fill factor of these types of OSJs. The PLQY of donors demonstrates a negative effect on the short-circuit current ( $J_{{\rm SC}}$ ) of OSJs. The molecular orientation of donors also influences the OSJ performance for both linear- or planar-shaped molecules, and horizontal orientation helps to achieve a higher $J_{{\rm SC}}$ . The influencing priority of molecule characteristics of donors is PLQY>orientation.