Patent ID: 8456081

Claim:
A first device, further comprising: an organic light emitting device, further comprising: an anode; a cathode; and an emissive layer disposed between the anode and the cathode, the emissive layer further comprising: an organic host compound; an organic emitting compound capable of fluorescent emission; and an organic dopant compound; wherein: the triplet energy of the organic dopant compound is lower than or equal to the triplet energy of the organic host compound; the triplet energy of the organic dopant compound is lower or equal to than the triplet energy of the organic emitting compound; the singlet energy of the organic emitting compound is lower than the singlet energy of the organic host compound; the singlet energy of the organic emitting compound is lower than the singlet energy of the organic dopant compound; and the organic dopant compound does not strongly absorb the fluorescent emission of the organic emitting compound; and wherein, the triplet energy of the dopant compound is greater than 1.6 eV.