The exciton dynamics in monolayer black phosphorus is investigated over a very wide range of photoexcited exciton densities using time resolved photoluminescence. At low excitation densities, the exciton dynamics is successfully described in terms of a double exponential decay. With increasing exciton population, a fast, non-exponential component develops as exciton-exciton annihilation takes over as the dominant recombination mechanism under high excitation conditions. Our results identify an upper limit for the injection density, after which exciton-exciton annihilation reduces the quantum yield, which will significantly impact the performance of light emitting devices based on single layer black phosphorus.
@article{arxiv.1605.06998,
title = {Onset of exciton-exciton annihilation in single layer black phosphorus},
author = {A. Surrente and A. A. Mitioglu and K. Galkowski and L. Klopotowski and W. Tabis and B. Vignolle and D. K. Maude and P. Plochocka},
journal= {arXiv preprint arXiv:1605.06998},
year = {2016}
}