| 简介： |
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Four 4,4 ′ -bis(1,2,2-triphenylvinyl)biphenyl (BTPE) derivatives, 4,4 ′ -bis(1,2,2-
triphenylvinyl)biphenyl, 2,3 ′ -bis(1,2,2-triphenylvinyl)biphenyl, 2,4 ′ -bis(1,2,2-
triphenylvinyl)biphenyl, 3,3 ′ -bis(1,2,2-triphenylvinyl)biphenyl and
3,4 ′ -bis(1,2,2-triphenylvinyl)biphenyl ( o TPE- m TPE, o TPE- p TPE, m TPE- m TPE,
and m TPE- p TPE, respectively), are successfully synthesized and their thermal,
optical, and electronic properties fully investigated. By merging two simple
tetraphenylethene (TPE) units together through different linking positions,
the π -conjugation length is effectively controlled to ensure the deep-blue
emission. Because of the minor but intelligent structural modifi cation, all
the four fl uorophores exhibit deep-blue emissions from 435 to 459 nm with
Commission Internationale de l’Eclairage (CIE) chromaticity coordinates of,
respectively, (0.16, 0.14), (0.15, 0.11), (0.16, 0.14), and (0.16, 0.16), when
fabricated as emitters in organic light-emitting diodes (OLEDs). This is completely
different from BTPE with sky-blue emission (0.20, 0.36). Thus, theseresults may provide a novel and versatile approach for the design of deepblueaggregation-induced emission (AIE) luminogens. |
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