Bimodal exciton-plasmon light sources controlled by local charge carrier injection.

ABSTRACT: Electrical charges can generate photon emission in nanoscale quantum systems by two independent mechanisms. First, radiative recombination of pairs of oppositely charged carriers generates sharp excitonic lines. Second, coupling between currents and collective charge oscillations results in broad plasmonic bands. Both luminescence modes can be simultaneously generated upon charge carrier injection into thin C₆₀ crystallites placed in the plasmonic nanocavity of a scanning tunneling microscope (STM). Using the sharp tip of the STM as a subnanometer-precise local electrode, we show that the two types of electroluminescence are induced by two separate charge transport channels. Holes injected into the valence band promote exciton generation, whereas electrons extracted from the con

SUBMITTER: Merino P 

PROVIDER: S-EPMC5969822 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature