Varghese Shinto, Park Sang Kyu, Casado Santiago, Fischer Roland C, Resel Roland, Milián-Medina Begoña, Wannemacher Reinhold, Park Soo Young, Gierschner Johannes
†Madrid Institute for Advanced Studies, IMDEA Nanoscience, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain.
‡Center for Supramolecular Optoelectronic Materials and WCU Hybrid Materials Program, Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea.
J Phys Chem Lett. 2013 May 16;4(10):1597-602. doi: 10.1021/jz400659b. Epub 2013 Apr 25.
J-aggregation has been shown to be beneficial for light amplification in single crystals of π-conjugated organic molecules. In the case of H-aggregation, the criteria for such processes are still under debate. It has also been shown that H-aggregate arrangements with considerable π-π overlap are detrimental for light amplification. We show here that a proper alignment of the molecules in the crystal lattice, which minimizes π-π overlap between adjacent molecules, gives rise to (random) stimulated emission from cofacial arrangements similar to that of the herringbone aggregates.
J-聚集已被证明有利于π共轭有机分子单晶中的光放大。在H-聚集的情况下，此类过程的标准仍在争论中。也已表明，具有相当大π-π重叠的H-聚集体排列不利于光放大。我们在此表明，晶格中分子的适当排列可使相邻分子之间的π-π重叠最小化，从而产生与鱼骨状聚集体类似的共面排列的（随机）受激发射。
