Organic semiconductor lasers Tripleit Manager

There is provided a first device. The device comprises an organic semiconductor laser. The organic semiconductor laser further comprises an optical resonator and an organic layer disposed in the optical resonator. The organic layer comprises an organic host compound; an organic emitting compound which is capable of fluorescence emission; and an organic dopant compound. The organic dopant compound may be referred to as "triplet Manager" here. The triplet energy of the organic dopant compound is less than or equal to the triplet energy of the organic host compound. The triplet energy of the organic dopant compound is less than or equal to the triplet energy of the organic emissive compound. The singlet energy of the organic emissive compound is less than or equal to the singlet energy of the organic host compound.