1 research outputs found
Tunneling-Driven Marcus-Inverted Triplet Energy Transfer in a Two-Dimensional Perovskite
Quantum tunneling, a phenomenon that allows particles
to pass through
potential barriers, can play a critical role in energy transfer processes.
Here, we demonstrate that the proper design of organic–inorganic
interfaces in two-dimensional (2D) hybrid perovskites allows for efficient
triplet energy transfer (TET), where quantum tunneling of the excitons
is the key driving force. By employing temperature-dependent and time-resolved
photoluminescence and pump–probe spectroscopy techniques, we
establish that triplet excitons can transfer from the inorganic lead-iodide
sublattices to the pyrene ligands with rapid and weakly temperature-dependent
characteristic times of approximately 50 ps. The energy transfer rates
obtained based on the Marcus theory and first-principles calculations
show good agreement with the experiments, indicating that the efficient
tunneling of triplet excitons within the Marcus-inverted regime is
facilitated by high-frequency molecular vibrations. These findings
offer valuable insights into how one can effectively manipulate the
energy landscape in 2D hybrid perovskites for energy transfer and
the creation of diverse excitonic states