A first device is provided. The device includes an organic semiconductor laser. The organic semiconductor laser further includes an optical cavity and an organic layer disposed within the optical cavity. The organic layer includes: an organic host compound; an organic emitting compound capable of fluorescent emission; and an organic dopant compound. The organic dopant compound may also be referred to herein as a "triplet manager." 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 than or equal to the triplet energy of the organic emitting compound. The singlet energy of the organic emitting compound is lower than or equal to the singlet energy of the organic host compound.
STATEMENT AS TO RIGHTS TO INVENTIONS MADE UNDER FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
 This invention was made with government support under FA9550-10-1-0339 awarded by the AFOSR (AirForce Office of Scientific Research). This invention was made with government support under DE-SC0001013 awarded by the U.S. Department of Energy, Energy Frontier Center at the University of Southern California. The government has certain rights in the invention.
 The claimed invention was made by, on behalf of, and/or in connection with one or more of the following parties to a joint university corporation research agreement: Regents of the University of Michigan, Princeton University, The University of Southern California, and the Universal Display Corporation. The agreement was in effect on and before the date the claimed invention was made, and the claimed invention was made as a result of activities undertaken within the scope of the agreement.