Acridines are organic compounds and nitrogen heterocycles having the formula C13H9N. Acridine is a substituted derivative of the parent ring. It is a planar molecule structurally related to anthracene in which one carbon in the central CH group is replaced by nitrogen. Acridine and its derivatives can be used to make dyes and also used in the pharmaceutical industry. Acridine is a DNA intercalator that easily binds to DNA. Due to its DNA-intercalating properties, acridine or its suitable derivatives are expected to preferentially accumulate in tumors, which are always associated with enhanced DNA replication. Therefore, radiolabeled acridines may have prospect in tumor imaging.
The most common type of organic photodetector is the organic photodiode (OPD). The photodiode has a simple structure in which an active layer is sandwiched between a transparent electrode and a metal electrode. In contrast to OLEDs, organic photodiodes (OPDs) utilize the organic semiconductor to absorb incident light and convert it to electric current. The structure and working principle are more like organic solar cells. Among the various organic photodetectors, organic photodiodes (OPDs) have been the most widely studied due to their fast response, high sensitivity, and full use of the existing research base of organic photovoltaics (OPVs).