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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Aggregation-Induced Emission Enhancement of organic and polymeric fluorophores containing 2,4,6-Triphenylpyridine moiety

Li, Yi-wei 13 July 2012 (has links)
In this study, organic and polymeric fluorophores based on 2,4,6-triphenylpyridiene (TPP) structure were found to have the novel aggregation-induced emission enhancement (AIEE) property. For the small-mass fluorophores, TPP and cyano-functionalized TPP (TPP-CN) were prepared from the facile Chichibabin reaction and their AIEE properties were characterized by the emission behavior in solvent/nonsolvent pair. Solid samples of TPP and TPP-CN exhibit enhanced emission with increasing annealing time under solvent vapors, thus, both compounds have the characters of crystallization-induced emission enhancement (CIEE) behavior. For polymeric system, copolymers PTPPF containing alternative TPP and 9,9-dioctylfluorene units were prepared through Suzuki coupling and study on its fluorescence behavior also reveals its AIEE feature. The rigid polymer possesses high emission intensity in its dilute solution state and remains almost unchanged with increasing nonsolvent fraction. The solid sample was found to have a high quantum yield (ФF) of 70 %.

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