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-556
Subject The effects of substituents and linker types on perylene-based functional dyes with aggregation induced emission enhancement(AIEE) properties
Authors HyunKyu Lee, Jae Pil Kim1,*
Materials Science and Engineering, Seoul National University, Korea
1Department of materials science and engineering, Seoul National University, Korea
Abstract Perylenebisimide(PBI) is a type of organic dye with high optical property which has intensively studied in the field of light harvesting systems, chemo-sensors and organic transistors. However, PBI-based dyes are subjected to aggregation caused quenching(ACQ) effect in high concentration and solid state due to its planar shape and strong intermolecular π-π interaction. ACQ effect resulting from the dissipation of energy in non-radiative decay leads to deterioration of fluorescence behavior, limiting the application of functional dyes. To circumvent this problem, we suggest a new concept of PBI dyes which show aggregation induced emission enhancement(AIEE) effect. Dyes with rotational functional groups show an increased fluorescence in aggregation state by the restriction of non-radiative energy dissipation as the intramolecular rotation is prohibited. Thus, new PBI dyes were synthesized with propeller-shpaed substituents such as triphenylamine(TPA), tetraphenyl-ethene(TPE) attached to the bay position of the perylene moiety. Also, we applied three types of linker(nitrogen, oxygen, and direct carbon bridge) between substituents and perylene core in order to find the relationship between the type of linkers and photophysical properties. Their absorption, fluorescence spectra, and quantum yield were measured and studied. AIEE activity is observed by adjusting the ratio of organic solvent and water, intentionally inducing the aggregates formation.
E-mail nikonfe51@snu.ac.kr