Shaping white light through electroluminescent fully organic coupled microcavities.

White organic light emitting diodes (white-OLEDs) have shown the potential to replace commercial sources for lighting applications because of their high effi ciency and superior color quality. The most conventional architectures used to maximize the performances of such devices consist in the employment of three kinds of emitting phosphorescent or fl uorescent molecules and modifi ed glass substrates for the optical management of light outcoupling. [ 1–5 ] Maximum power effi ciencies larger than 70 lm W − 1 and color rendering index (CRI) values higher than 80 have been recently achieved by means of phosphorescent materials, [ 1 , 2 ] while power effi ciencies larger than 20 lm W − 1