High efficiency and brightness fluorescent organic light emitting diode by triplet-triplet fusion

摘要

A first device is provided. The first device further comprises an organic light emitting device. The organic light emitting device further comprises an anode, a cathode, and an emissive layer disposed between the anode and the cathode. The emissive layer may include an organic host compound and at least one organic emitting compound capable of fluorescent emission at room temperature. Various configurations are described for providing a range of current densities in which T-T fusion dominates over S-T annihilation, leading to very high efficiency fluorescent OLEDs.

主权项

1. An organic light emitting device, comprising:
an anode; a cathode; and an emissive layer disposed between the anode and the cathode, the emissive layer including an organic host compound and at least one fluorescent organic emitting compound capable of fluorescent emission at room temperature and generates both radiative singlet excitons and non-radiative triplet excitons as a result of electron-hole recombination; wherein: the overlap between the singlet emission spectrum of the fluorescent organic emitting compound and the triplet absorption spectrum of the host compound is less than 20 percent; wherein the host compound has a triplet energy and a singlet energy; and wherein twice the host compound triplet energy plus 0.3 eV is greater than the host compound singlet energy and twice the host compound triplet energy minus 0.5 eV is less than the host compound singlet energy.