Abstract
AbstractIn order to elucidate the origin of gain‐narrowed photoluminescence spectra of 5,5″‐bis(4‐biphenylyl)‐2,2′:5′,2″‐terthiophene (BP3T) single crystals, the dependence of excitation energy threshold on excitation lengths was studied at 12 K. The emission peak of the 0‐1 vibrational band was narrowed at a constant excitation density irrespective of the excitation length, indicating that the gain‐narrowing followed a stimulated emission process. On the other hand, the excitation density threshold for the 0‐2 peak decreased with increasing excitation length. The latter behaviour is suggestive of a cooperative interaction among uniaxially oriented transition dipoles in the BP3T crystal. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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