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Keywords:

  • phosphorescent organic light emitting diodes;
  • energy transfer;
  • exciton trapping;
  • interlayer-free
Thumbnail image of graphical abstract

A novel all-phosphor, four-color, white organic lightemitting diode (WOLED) architecture is presented that utilizes molecular energy transfer or, specifically, triplet exciton down conversion within common organic layers in a cascaded emissive zone configuration. As reported by Yi-Lu Chang, Gregory D. Scholes, Zhenghong Lu, and co-workers on page 705, exceptional performance combinations of external quantum efficiency and color rendering index are achieved. This represents a significant step towards the realization of WOLEDs in solid-state lighting.