High Efficiency over 15% by Breaking the Theoretical Efficiency Limit of Fluorescent Organic Light-Emitting Diodes with Localized Surface Plasmon Resonance Effects

The theoretical efficiency limit of fluorescence organiclight-emittingdiodes (OLEDs) was successfully surpassed by utilizing the localizedsurface plasmon resonance (LSPR) effect with conventional emissivematerials. The interaction between polaritons and plexcitons generatedduring the LSPR process was also analyzed experimentally. As a result,the external quantum efficiency (EQE) increased dramatically from6.01 to 15.43%, significantly exceeding the theoretical efficiencylimit of fluorescent OLEDs. Additionally, we introduced a new conceptof the LSPR effect, called LSPR sensitizer, whichallowed for simultaneous improvement in color conversion and efficiencythrough cascade transfer of the LSPR effect. To the best of our knowledge,the EQE and the current efficiency of our LSPR-OLED are thehighest among LSPR-based fluorescent OLEDs to date.

Automated summary

By utilizing the localized surface plasmon resonance (LSPR) effect, the theoretical efficiency limit of fluorescence organic light-emitting diodes (OLEDs) was surpassed, and the interaction between polaritons and plexcitons during the LSPR process was experimentally analyzed. The external quantum efficiency (EQE) significantly increased from 6.01% to 15.43%, exceeding the theoretical efficiency limit of fluorescent OLEDs. A new concept of LSPR sensitizer was introduced, allowing for simultaneous improvement in color conversion and efficiency through cascade transfer of the LSPR effect. To date, our LSPR-OLED has achieved the highest EQE and current efficiency among LSPR-based fluorescent OLEDs.