121st General Meeting of the KCS

Type Poster Presentation
Area Organic Chemistry
Room No. Event Hall
Time 4월 19일 (목요일) 11:00~12:30
Code ORGN.P-473
Subject Effects of fluorescent queinching of methoxytriphenylamine moieties on diketopyrrolopyrrole fluorescent dyes
Authors Tae Gyu Hwang, Jae Pil Kim*
Department of materials science and engineering, Seoul National University, Korea
Abstract In intermolecular systems, the fluorescent quenching can be explained by many principles and theories such as collisional quenching, dynamic quenching, static quenching, energy transfer, etc. However, some mechanisms of fluorescent quenching are still unrevealed in intramolecular systems. Some studies have been reported that the methoxy groups on luminophores can induce intramolecular fluorescent quenching, but not clarified their kinetics. Here, we synthesized and analyzed the diketopyrrolopyrrole dyes having triphenylamine moieties with/without methoxy group and analyzed their optical properties. To clarify the mechanism of fluorescent quenching by methoxy groups, we assumed that photoinduced electron transfer(PET) in intramolecular systems is the main principle. To prove the assumption, aggregation induced emission (AIE) properties, which is derived from the triphenylamine moieties are exploited to control the intramolecular charge transfer(ICT) between donatings group and accepting groups. Also, the ultrafast femtosecond transient absorption spectroscopy(fsTA) and time-corelated single photon counting(TCSPC) were exploited to conduct time-resolved spectroscopies to prove the PET process in intramolecular system.
E-mail taegyu48@snu.ac.kr