Coexistence of free and self-trapped excitons in disordered J-aggregates

摘要

Coexistence of free and self-trapped exciton in amphi-PIC J-aggregates is proved by the numerous experimental data presented and analyzed. The self-trapping states are shown to originate from delocalized exciton states exhibiting collective nature of polaronic relaxation. The strong correlation between the efficiency of exciton self-trapping and static disorder degree in J-aggregates has been shown. In amphi-PIC J-aggregates the polaronic state formation found out to require the overcoming an energy barrier which appears for quasi-one-dimension system as a result of combination of one-dimensional exciton motion and three-dimension lattice deformation.