A blue-emitting distributed feedback laser based on a star-shaped oligofluorene truxene molecule is presented. The gain, loss, refractive index, and (lack of) anisotropy are measured by amplified spontaneous emission and variable-angle ellipsometry. The waveguide losses are very low for an organic semiconductor gain medium, particularly for a neat film. The results suggest that truxenes are promising for reducing loss, a key parameter in the operation of organic semiconductor lasers. Distributed feedback lasers fabricated from solution by spin-coating show a low lasing threshold of 270 W/ cm2 and broad tunability across 25 nm in the blue part of the spectrum.
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机译：提出了一种基于星形低聚芴茂分子的蓝光分布反馈激光器。增益，损耗，折射率和（缺乏）各向异性是通过放大的自发发射和可变角度椭圆光度法测量的。对于有机半导体增益介质，特别是对于纯净膜，波导损耗非常低。结果表明，戊二烯有望降低损耗，这是有机半导体激光器工作的关键参数。由溶液通过旋涂制成的分布式反馈激光器在光谱的蓝色部分显示出270 W / cm2的低激射阈值和25 nm宽的可调性。
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