Yi Jin, Yan-Teng Xu, Yin-Ling Liu
Sep 1, 2011
Citations
0
Influential Citations
62
Citations
Journal
Dyes and Pigments
Abstract
Abstract A series of diketopyrrolopyrrole-based luminophores were synthesized and characterized. Their photoluminescent properties were affected significantly by the change of π -conjugated units and alkyl groups linked to the diketopyrrolopyrrole-ring. 2,5-Dialkyl-3,6-bis(4-((10-oxoanthracen-9( 10H )-ylidene)methyl)phenyl)pyrrolo[3,4-c]pyrrole-1,4-dione showed aggregate-induced emission enhancement and crystallization-induced emission enhancement properties while 3,6-bis(4-[1,3]dioxolan-2-yl-phenyl)-2,5-dialkylpyrrolo[3,4-c]pyrrole-1,4-dione, 2,5-dialkyl-3,6-bis(4-formylphenyl)pyrrolo[3,4-c]pyrrole-1,4-dione, and 2,5-dioctyl-3,6-bis{4-[2-(4-bromophenyl)-2-cyanovinyl]-phenyl}pyrrolo[3,4-c]pyrrole-1,4-dione did not exhibit these properties. The results showed that emission enhancements of the luminophores depended on the competition between the restriction of intramolecular rotation and π–π aggregation with the former causing emission enhancement and the latter inducing fluorescence quenching.