Journal
CRYSTAL GROWTH & DESIGN
Volume 7, Issue 12, Pages 2512-2516Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cg070270u
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We prepared a large slice crystal of trans-DPDSB with a regular shape by the physical vapor transport method and determined its crystal structure, which is different from the needle-like crystal grown in a mixture of chloroform and methanol. In the slice crystal, all of the molecules are packed in layer-by-layer mode with the same molecular orientation, and in one molecular layer, the molecules are packed in a brick wall motif (J-aggregate). The crystal has a very high luminescence efficiency of 48 4%, attributed to the special molecular dipole stacking mode, and stimulated emission is observed under optical pumping.
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