A thioxanthone ring system derivative compound is provided. The thioxanthone ring system derivative compound is represented by a formula (I): wherein X is a substituent being one selected from a group consisting of halogens, wherein R1 is a substituent being one selected from a group consisting of sulfur and sulfur dioxide, wherein R2 is a substituent being one selected from a group consisting of C1˜C10 alkyl group, C3˜C10 branched alkyl group, C3˜C10 cyclic alkyl group, phenyl group, phenyl alkyl group, and wherein hydrogen of phenyl group can be partially substituted by halogens, alkoxyl group, C1˜C10 alkyl group, nitro group or amine group.