Realizing improved performance of down-conversion white organic light-emitting diodes by localized surface plasmon resonance effect of Ag nanoparticles

       Down-conversion structure white organic light-emitting diodes (WOLEDs), in which white light is
generated by a blue emission organic light-emitting diodes (OLEDs) in combination with a color conversion
layer (CCL) outside the substrate, has attracted extensive interest due to its significant advantages
in low cost and stabilized white-light emissions. However, low color-conversion efficiency of CCL is still a
bottleneck for the performance improvement of down-conversion WOLEDs. Here, we demonstrate an
approach to enhance the color-conversion efficiency of CCL-WOLEDs by localized surface plasmon
resonance (LSPR) effect. In this approach, a blend of Ag nanoparticles and polyvinyl alcohol (PVA) is
solution-deposited between the blue organic light emitting diodes and color-conversion layer. Based on
the LSPR effect of this modified structure, the color conversion efficiency has improved 32%, from 45.4%
to 60%, resulting a 14.4% enhancement of the current efficiency, from 9.73 cd/A to 11.14 cd/A. Our work
provides a simple and low-cost way to enhance the performance of down-conversion WOLEDs, which
highlights its potential in illumination applications