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Amplified spontaneous emission in free-standing membranes incorporating star-shaped monodisperse π-conjugated truxene oligomers

Guilhabert, Benoit and Laurand, Nicolas and Herrnsdorf, Johannes and Chen, Yujie and Mackintosh, Allan R. and Kanibolotsky, Alexander L. and Gu, Erdan and Skabara, Peter J. and Pethrick, R. A. and Dawson, Martin D. (2010) Amplified spontaneous emission in free-standing membranes incorporating star-shaped monodisperse π-conjugated truxene oligomers. Journal of Optics, 12 (3). ISSN 0972-8821

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A light-emitting photoresist comprising a vinyl-ether-based photosensitive polymer host doped with star-shaped π-conjugated truxene-core oligomers is shown to be a promising platform for the realization of soft-matter photonic devices. In particular, a simple process for the fabrication of free-standing membranes with no spin casting and peel-off steps is reported. The approach uses instead the hydrophobic nature of the nanocomposites. Membranes are fabricated, with a concentration of 20 mg ml−1 of the truxene oligomer denoted as T3, directly on deionized water by ultraviolet flood illumination. The resulting membrane is 94 μm thick on average with a diameter up to 50 mm. Amplified spontaneous emission developing around 435 nm above an ∼400 μJ cm−2 threshold is obtained by optical pulse pumping the sample at 355 nm in an edge-emitting photoluminescence configuration. These membranes form a versatile platform for flexible organic semiconductor lasers and optical amplifiers