Plasmon enhanced fluorescence from meticulously positioned gold nanoparticles, deposited by ultra sonic spray coating on organic light emitting diodes

Enhancement of the spontaneous emission of fluorophores aided by plasmonic nanoparticles (PNPs) prompts the growth of plasmonic organic light emitting diodes (OLEDs). Together with the spatial dependence of the fluorophore and PNPs on enhanced fluorescence, the surface coverage of the PNPs controls the charge transport in OLEDs. Hence, here, the spatial and surface coverage reliance of plasmonic gold nanoparticles is controlled by a roll-to-roll compatible ultrasonic spray coating technique. A 2-fold enhancement in the multi photon fluorescence is seen by two-photon fluorescence microscopy for a polystyrene sulfonate (PSS) stabilized gold nanoparticle located 10 nm away from the super yellow fluorophore. Fluorescence enhancement combined with similar to 2% surface coverage of PNPs, provides a 33%, 20% and similar to 40% increase in the electroluminescence, luminous efficacy and external quantum efficiency, respectively.

Automated summary

The spatial and surface coverage dependence of plasmonic gold nanoparticles is controlled by a roll-to-roll compatible ultrasonic spray coating technique, resulting in enhanced fluorescence and charge transport in organic light emitting diodes. Two-photon fluorescence microscopy shows a 2-fold enhancement in multi-photon fluorescence for gold nanoparticles stabilized by polystyrene sulfonate (PSS) located 10 nm away from the super yellow fluorophore. Fluorescence enhancement, combined with approximately 2% surface coverage of PNPs, leads to a 33%, 20%, and approximately 40% increase in electroluminescence, luminous efficacy, and external quantum efficiency, respectively.