Femtosecond Excitation Correlation Spectroscopy of Single-Walled Carbon Nanotubes : Analysis Based on Nonradiative Multiexciton Recombination Processes

TL;DR

This paper uses femtosecond excitation correlation spectroscopy to analyze multiexciton recombination in single-walled carbon nanotubes, revealing that long-time signals are dominated by single exciton decay, offering a new method to study exciton dynamics.

Contribution

It introduces a theoretical framework and experimental approach to distinguish single exciton decay from multiexciton processes in SWNTs using FEC spectroscopy.

Findings

Long-time FEC signals are dominated by single exciton decay.

Efficient exciton-exciton annihilation observed in SWNTs.

Provides a simple method to analyze exciton dynamics in low-dimensional materials.

Abstract

We studied the nonlinear time-resolved luminescence signals due to multiexciton recombination processes in single-walled carbon nanotubes (SWNTs) using femtosecond excitation correlation (FEC) spectroscopy. From theoretical analysis of the FEC signals, we found that the FEC signals in the long time range are dominated by the single exciton decay in SWNTs, where the exciton-exciton annihilation process is efficient. Our results provide a simple method to clarify the single exciton decay dynamics in low-dimensional materials.