121st General Meeting of the KCS

Type Poster Presentation
Area Physical Chemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code PHYS.P-240
Subject Photophysical properties of 1,4-Di(1-pyrenyl)benzene in various solvents
Authors Siin Kim, Doo-Sik Ahn1, Jungkweon Choi1,*, Hyotcherl Ihee*
Department of Chemistry, Korea Advanced Institute of Science and Technology, Korea
1Center for Nanomaterials and Chemical Reactions, Institute for Basic Science, Korea
Abstract Understanding excited carrier dynamics is important to understand the chemical reaction mechanisms and to develop molecular electronic devices. Various systems have been studied to elucidate the excited carrier dynamics such as charge transfer and energy transfer. Detailed excited state dynamics is still unclear despite many model systems has reported. Pyrene is a prototypical π-conjugated chromophore and one of the most used systems. Its durable electronic properties and supramolecular chemistry have attracted lots of interests. We applied the steady-state absorption and emission, and broadband transient absorption (TA) spectroscopy to investigate the primary excited carrier dynamics of 1,4-Di(1-pyrenyl)benzene. The emission spectrum of this molecule exhibits solvent dependence, which provides an evidence of the formation of charge transfer state. To elucidate the relaxation dynamics of photo-induced charge carriers, TA spectra of the molecule were recorded in various solvents. In the most polar solvent of acetonitrile, the characteristic spectral feature linked to the charge-transfer state was observed in the TA spectra. From this, we revealed that the 1,4-Di(1-pyrenyl)benzene molecule has the intriguing solvent dependence in the excited carrier dynamics. The sysmtematic photophysical study of 1,4-Di(1-pyrenyl)benzene molecule give a perspective on excited state dynamics of multichromophoric molecules and potentially inspires the design of blue organic light-emitting diodes (OLEDs).
E-mail siin0308@gmail.com