Nanopatterning on a Biocompatible Polymer Film Accomplished with UV Embossing
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Optical Amplification Achieved in a First-Generation Dendritic Organic Semiconductor Since the discovery of their light-emitting properties, organic semiconductors have stimulated great interest within the display industries and opened opportunities for other optoelectronic devices, such as visible laser diodes and, most recently, optical amplifiers. There are three main classes of lightemitting organic semiconductors, of which the youngest technology is conjugated dendrimers—a family of highly branched molecules. In a dendrimer, the
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molecular branches form a snowflakelike structure that converges to a single focal point or core. This type of structure allows for the independent tuning of the electrical, optical, and processing properties of the material. As reported in the April 15 issue of Optics Letters, researchers J.R. Lawrence of St. Andrews University, G.J. Richards of Oxford University, and their colleagues have observed strong optical amplification of violet light in both the liquid and solid states of first-generation bis(fluorene)cored semiconducting dendrimers. The core, consisting of a bis(fluorene) unit
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