Charge-lattice coupling effects in organic isomeric charge transfer crystals

Abstract

One of the most important features of organic cocrystals is the interaction between electrons and lattices, which brings interesting physical phenomena. In this work, we prepared two isomeric crystals in which the isomeric donors are used to fabricate charge transfer crystals. Isomeric crystals present different electron–lattice coupling strengths to further affect the charge localization, which leads to different dielectric constants and fluorescence lifetimes. Furthermore, external magnetic field and electric field exhibit different tunability on the photoluminescence and dielectric constants of the isomeric cocrystals due to the significant differences in the coupling between the charge and lattice vibration. Overall, through fabricating isomeric organic crystals, neighbor molecular vibration dependence of electron–lattice coupling is studied, which provides a platform to further understand the lattice vibration dependent spin and optics.