Stimulated Emission Properties of Sterically Modified Distyrylbenzene-Based H-Aggregate Single Crystals.
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.
†Madrid Institute for Advanced Studies, IMDEA Nanoscience, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain.
Shinto
S
Varghese
‡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.
Sang Kyu
SK
Park
†Madrid Institute for Advanced Studies, IMDEA Nanoscience, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain.
Santiago
S
Casado
Roland C
RC
Fischer
Roland
R
Resel
†Madrid Institute for Advanced Studies, IMDEA Nanoscience, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain.
Begoña
B
Milián-Medina
†Madrid Institute for Advanced Studies, IMDEA Nanoscience, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain.
Reinhold
R
Wannemacher
‡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.
Soo Young
SY
Park
†Madrid Institute for Advanced Studies, IMDEA Nanoscience, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain.
Johannes
J
Gierschner
H-aggregates; crystal structure; solid-state fluorescence; stimulated emission