Provided is a space-charge transfer compound. The space-charge transfer compound has a molecular formula, wherein the molecular formula represents a structure in which a benzene linker is interposed between an electron doner moiety and an electron acceptor and each thereof is combined to the first and the eighth positions of a naphthalene core. The electron doner moiety is selected from a naphthalene core, cabazole, phenyl cabazole, or biphenylamine. The electron acceptor moiety is selected from pyridine, diazine, triazole, or phenylbenzodiazole. The compound of the present invention can resolve a problem of fluorescence substances in having a low quantum yield.