PPA-904 is primarily used in the field of organic electronics, particularly in the development of high-performance organic semiconductors. Its application is crucial in the fabrication of organic light-emitting diodes (OLEDs), where it enhances the efficiency and stability of the devices. Additionally, PPA-904 is employed in organic photovoltaics (OPVs) to improve the light absorption and charge transport properties, leading to more efficient solar cells. Its role in these technologies contributes to advancements in flexible and lightweight electronic devices, making it a valuable component in modern optoelectronic applications.