Unconventional Lasing in Organic Semiconductors

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Speaker: Stephane Kena-Cohen, Imperial College, UK

Date: September 14, 2011

Event: Solid-State Lighting Science Workshop in Novel Emitters and Nanostructured Materials
Abstract: The high optical gain and versatility afforded by organic semiconductors make them an attractive medium for the realization of coherent light sources. It is clear, however, that lasing thresholds must be further reduced to achieve lasing via electrical injection. In this talk we present two novel approaches to organic lasing. In the first, a microcavity containing an anthracene single crystal in the strong exciton-photon coupling regime is realized. Coherent emission of polaritons, the resulting mixed light-matter states, is achieved, via a mechanism that does not require a population inversion. In the second approach, we demonstrate that low threshold random lasing can be obtained using as-grown doped organic films containing dicyanomethylene-based dyes without the need for optical feedback or infiltrated scatterers.