Stretchable organic LEDs with an “exciplex” state are highly efficient

Fully stretchable organic light-emitting diodes (OLEDs) have been limited by poor efficiency, in part because their flexible polymer components hinder the harvesting of “triplet-state” quasiparticles that can be converted into light-emitting states. Fully stretchable OLED displays with unprecedented efficiencies have been developed that recycle triplets in a way that withstands elastomer.