Diphenylperylene Isomers as Novel Emissive Organic Semiconductors

Abstract

Emissive organic semiconductors are crucial for integrated optoelectronic devices, yet only a limited number of materials exhibit high mobility and high photoluminescence quantum yield because of the contradictory requirements for molecular stacking. In this study, two diphenylperylene isomers, 39P-Ph and 310P-Ph, were successfully synthesized through a one-step process by varying the positions of the substituent phenyl groups on the perylene core. Both compounds were comprehensively characterized and demonstrated excellent hole transport capabilities and moderate photoluminescence quantum yield (PLQY), along with long-wavelength emission, establishing them as effective emissive organic semiconductors. 39P-Ph emits orange-yellow fluorescence in crystalline powder with an absolute PLQY of 15.4 % and 310P-Ph shows orange-red emission with an emissive wavelength of up to 612 nm in 17.5 % PLQY. Moreover, the carrier mobilities of 39P-Ph and 310P-Ph are up to 3.05 cm² V⁻¹ s⁻¹ and 1.36 cm² V⁻¹ s⁻¹, respectively, based on the single-crystal devices. These results reveal that 39P-Ph and 310P-Ph are promising candidates as emissive semiconductors, offering a balance between efficient charge transport and light emission for integrated optoelectronic applications.