Influence of the photoexcitation process on the dynamics of triplet excitons in organic polymers

In this work we adopt a model Hamiltonian approach to investigate exciton generation and its subsequent dynamics in conjugated polymers. By using a modified version of the Su–Schrieffer–Heeger model Hamiltonian to include temperature effects, interaction between polymer chains, and different photoexcitation processes, we study the dynamics of triplet excitons in the system. The temperature is incorporated in the method by means of a classical Langevin equation, and Ehrenfest molecular dynamics is used to describe the time evolution of the system. We were able to distinguish the response of the oscillating electric dipole for different excitations at nonzero temperatures based on the amplitude and frequency.