Publication date: 8th July 2026
Low-dimensional metal halide perovskites exhibit rich excitonic physics arising from strong carrier–phonon coupling, exciton localization, and self-trapping processes. These unique characteristics lead to excited-state dynamics that differ fundamentally from those of conventional free-exciton semiconductors, involving complex pathways of energy relaxation, recombination, and energy transfer. Understanding and controlling these excitonic processes is essential for the development of next-generation light-emitting materials and devices.
In this presentation, I will discuss our recent efforts to understand exciton dynamics in low-dimensional metal halides using ultrafast spectroscopic techniques. We reveal that localized excitons establish a rapid thermodynamic equilibrium with trap states in Mn²⁺-doped perovskite nanomaterials. Rather than acting solely as non-radiative loss channels, these trap states function as efficient intermediates for host-to-dopant energy transfer, accelerating Mn²⁺ excitation by more than an order of magnitude. More importantly, the trap states serve as exciton reservoirs that enable unusual emission behaviors, including persistent afterglow, anti-thermal quenching, and suppression of concentration quenching at high dopant concentrations.
Beyond understanding exciton dynamics, recent efforts have focused on actively manipulating excitonic processes on ultrafast timescales using advanced pump-push-probe spectroscopic approaches. Through selective perturbation of excited-state populations and energy-transfer pathways, exciton relaxation and emission processes can be dynamically regulated, providing new opportunities for controlling energy flow in low-dimensional perovskites. These studies highlight how a fundamental understanding of exciton dynamics can be translated into strategies for engineering and manipulating light-emission processes, opening new directions for advanced photonic and optoelectronic applications.
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