Organic light emitting diode (OLED) is an important technology for displays. While red and green phosphorescent emitters are commercially being used, blue phosphorescent emitters do not have the stability. In OLEDs, to form excitons in organic molecules in an OLED via electrical excitation, electrons and holes must be injected to the frontier lowest-unoccupied-molecular-orbital (LUMO) and the highest-occupied-molecular-orbital (HOMO) orbitals of the emitting molecule in the emissive layer, and the voltage to turn on the device typically corresponds to the bandgap energy of the emitter. As blue photons have a higher energy, the highest energy excitation required leads to device degradation.
The New Fusion technology is based on a phenomenon called triplet-triplet annihilation (TTA) which is a process in which two triplet excitons annihilate and produce a higher energy singlet exciton. While the quantum efficiency is lower than that of the phosphorescent OLEDs, the voltage required to drive the device is actually about half of what is required for phosphorescent OLEDs. As a result, the power efficiency of the New Fusion TTA device is about the same as phosphorescent OLEDs.