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Aggregation-enhanced emissions of intramolecular excimers in disubstituted polyacetylenes

Authors Qin, Anjun HKUST affiliated (currently or previously)
Jim, Cathy Ka Wai HKUST affiliated (currently or previously)
Tang, Youhong HKUST affiliated (currently or previously)
Lam, Jacky Wing Yip View this author's profile
Liu, Jianzhao HKUST affiliated (currently or previously)
Mahtab, Faisal HKUST affiliated (currently or previously)
Gao, Ping View this author's profile
Tang, Ben Zhong View this author's profile
Issue Date 2008
Source JOURNAL OF PHYSICAL CHEMISTRY B , v. 112, (31), 2008, AUG 7, p. 9281-9288
Summary Whereas chain aggregation commonly quenches light emission of conjugated polymers, we here report a phenomenon of aggregation-induced emission enhancement (AIEE): luminescence of polyacetylenes is dramatically boosted by aggregate formation. Upon photoexcitation, poly(1-phenyl-1-alkyne)s and poly(diphenylacetylene)s emit blue and green lights, respectively, in dilute THF solutions. The polymers become more emissive when their chains are induced to aggregate by adding water into their THF solutions. The polymer emissions are also enhanced by increasing concentration and decreasing temperature. Lifetime measurements reveal that the excited species of the polymers become longer-lived in the aggregates. Conformational simulations suggest that the polymer chains contain n = 3 repeat units that facilitate the formation of intramolecular excimers. The AIEE effects of the polymers are rationalized to be caused by the restrictions of their intramolecular rotations by the aggregate formation.
ISSN 1520-6106
Language English
Format Article
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