Simultaneous red–green–blue electroluminescent enhancement directed by surface plasmonic "far-field" of facile gold nanospheres

Based on the "far-field" effect of surface plasma resonance, simultaneous red–green–blue electroluminescence enhancement by facile synthesized gold nanospheres were realized in this work, which would be difficult and complex to attain using wavelength-selected localized surface plasma resonance. The plasmonic "far-field" effect can simultaneously enhance the whole emission region in the white light range, because the enhancing regions from blue to red emission are largely overlapped. By doping gold nanospheres embedded in a poly(3, 4-ethylene dioxythiophene): polystyrene sulfonic acid (PEDOT: PSS) layer, yield enhancement is achieved in more than 95% devices with the best enhancing ratio of 60% and the commission International de L'Eclairage (CIE) coordinate is stable at approximately (0.33, 0.36). The plasmonic "far-field" effect requires an ultra-low working concentration of Au NPs in picomolar magnitude, and shows little negative effect on the electronic process and light scattering, which has big potential in realizing highly efficient white organic light emitting diodes.