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We report amplified spontaneous emission (ASE) and optically pumped deep-blue-emitting distributed feedback (DFB) lasers based on a star-shaped oligofluorene truxene molecule. A low ASE threshold of 2.1kW/cm 2 at 439nm was achieved. The material exhibits a high net gain of 38cm −1 and also low optical loss coefficient of 3.5cm −1 . Second-order DFB lasers show tuning of the...
Copolymers containing alternating fluorene and 1,10-phenanthroline units, prepared by Suzuki coupling, were found to be capable of binding with Eu 3+ and Tb 3+ ions in the presence of dibenzoylmethane (dbm) or acetylacetonate (acac) ligands. Photoluminescence studies of the Eu-containing polymer showed a measurable additional longer wavelength emission on complexation compared to the...
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