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Dual Amplified Spontaneous Emission and Lasing from Nanographene Films

机译：双扩增的自发发射和从纳米膜膜激光

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Chemically synthesized zigzag-edged nanographenes (NG) have recently demonstrated great success as the active laser units in solution-processed organic distributed feedback (DFB) lasers. Here, we report the first observation of dual amplified spontaneous emission (ASE) from a large-size NG derivative (with 12 benzenoid rings) dispersed in a polystyrene film. ASE is observed simultaneously at the 685 and 739 nm wavelengths, which correspond to different transitions of the photoluminescence spectrum. Ultrafast pump-probe spectroscopy has been used to ascertain the underlying photophysical processes taking place in the films. DFB lasers, based on these materials and top-layer nanostructured polymeric resonators (i.e., one or two-dimensional surface relief gratings), have been fabricated and characterized. Lasers emitting close to either one of the two possible ASE wavelengths, or simultaneously at both of them, have been prepared by proper selection of the resonator parameters.
机译：化学合成的锯齿形沿着溶液处理有机分布式反馈（DFB）激光器中的活性激光器单元最近证明了巨大成功。在这里，我们报告了从分散在聚苯乙烯膜中的大尺寸Ng衍生物（具有12个苯外环）的双扩增自发发射（ASE）的首次观察。在685和739nm波长的同时观察到ASE，其对应于光致发光光谱的不同转变。超快泵探针光谱已经用于确定薄膜中发生的底层的光药过程。基于这些材料和顶层纳米结构的聚合物谐振器（即一个或二维表面浮雕光栅）的DFB激光器已经制造和表征。 Lasers emitting close to either one of the two possible ASE wavelengths, or simultaneously at both of them, have been prepared by proper selection of the resonator parameters.

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