1.7 Organic Lasers

Conjugated polymers in particular are good candidates for laser application for several reasons. The first is that the inherent electronic structure of most conjugated polymers is a four-level system. Materials with a four or more level level system are attractive for laser application. Another advantage of conjugated polymers for laser applications is the disorder of the conjugated system, which promotes the energy transfer from one region to another in the active layer. Conjugated polymers also have high luminescence efficiencies. Some of the conjugated polymers have the additional advantage that the emission and absorption spectra do not overlap.