(Lecture, Nov 17) Designer Molecules for Organic Electronics
November 14,2017 16:11:00 readCount:242
Topic: Designer Molecules for Organic Electronics
Speaker: Prof. Soo Young Park(Seoul National University)
Venue: Room N308A, Building of State Key Laboratory of Luminescent Materials and Devices, Northern Area, Wushan Campus
Time: Friday, Nov 17, 2017, 10:00
Organic π-conjugated molecules are designed and synthesized to show various light-matter interaction and charge injection/transport properties aiming at their specific applications to organic electronics including OLED, OTFT, and OSC devices. During last decades, we have challenged designer molecules with unique and unprecedented photophysical and optoelectronic properties (see http://csom.snu.ac.kr ). In this talk I will introduce most recent and selected designer molecules developed in my group in three different parts. First part is about the water-soluble and highly luminescent AIEE (aggregation-induced enhanced emission) supramolecular polymer. 1D supramolecular polymer with exceptionally high PLQY of 0.91 was obtained and characterized by the host-guest complexation of water-soluble cyanostilbene monomer (Py+-CN-MBE) and CB[8] in water.1 1D light harvesting system comprising various cyanostilbene monomers was subsequently fabricated and analyzed. Trilateral monomers for 2D supramolecular polymerization with CB[8] were also designed and investigated for enhanced fluorescence, anion sensing, and water splitting. Recently, the development of fluorescence photoswitching system, which can turn on/off fluorescence by light irradiation, has attracted much attention because of its potential in various optoelectronic applications including optical memory, bioimaging, and super-resolution microscopy. Second part of my talk is about developing multi-color fluorescent system showing color-specific fluorescence switching. We have originally designed successful color-specific photoswitching system composed of two excited-state intramolecular proton transfer (ESIPT) fluorophores and a color-specific photoswitchable diarylethene.2 We could also design two component system comprising the turn-on type fluorescent diarylethene and one ESIPT dye. This system is far excellent compared to the three component system in terms of the fluorescence on/off ratio and non-destructive read-out capability. Perfect color-specific switching and super-resolution imaging could be demonstrated based on this two-component system. In the third part, I will demonstrate two novel molecular skeletons developed in my group which promise various optoelectronic applications. Aiming at the enhanced semiconductivity and light emission, we have designed and synthesized various indolo[3,2-b]indole (IDID) derivatives: high-performance OFET with hole mobility of 0.98 cm2 V-1 s-1,3 ambipolar OFET semiconductor with balanced mobilities,4 and the superb hole transporting layer of perovskite solar cell to give remarkable power conversion efficiency of > 19 %.5 We could also develop novel high performance TADF emitters based on the IDID platform. On the other hand, we have designed and synthesized a novel electron-accepting bis-lactam building block, 3,7-dithiophen-2-yl-1,5-dialkyl-1,5-naphthyridine-2,6-dione (NTDT) and its derivatives. Compared to thiophenyl substituted DPP (DPPT), It was found that the NTDT unit showed enhanced transport and emission properties.6 We could demonstrate that NTDT-based conjugated polymer exhibits outstanding power conversion efficiency of > 9% in the bulk heterojunction solar cells. [References] (1) H. J. Kim et al., Angew. Chem. Int. Ed., 55, 15915–15919 (2016), (2) D. Kim et al., Adv. Opt. Mater., 4, 790-797 (2016), (3) I. Cho et al., Adv. Funct. Mater., 26, 2966-2973 (2016), (4) I. Cho et al., J. Mater. Chem. C, 4, 9460-9468 (2016), (5) I. Cho et al., Chem. Sci., 8, 734-741 (2017), (6) W. S. Yun et al., Macromolecules, 49, 8489–8497 (2016).
Soo Young Park
Affiliation: Dept. Mat. Sci. Eng., Seoul National University
Telephone: +82-2-880-8327
Fax: +82-2-885-1748
E-mail: parksy@snu.ac.kr
URL: http://csom.snu.ac.kr
Academic background:
1980    Bachelor of Science, Seoul National University 
1982    Master of Science, Seoul National University 
1988    Ph. D. Seoul National University 
Professional career:
1995-   : Professor, School of Materials Sci. and Eng., Seoul National University
2011-   : Fellow, Korean Academy of Science and Technology
2009-   : Director, Center for Supramolecular Optoelectronics Materials 
2015-   : Guest Professor, Osaka University
2004-2009: Director, Organic Nano-Photonics Lab (National Research Laboratory)
1985-1995: Senior Researcher, Korea Institute of Science and Technology 
Research interests:
Fluorescent/Phosphorescent Organic Molecules
Organic Nano-materials for Electronics and Photonics
Nonlinear Optic Material, Photorefractive Organic Material
Multifunctional Liquid Crystal, Supramolecules, and Macromolecules
ESIPT (Excited State Intramolecular Pronton Transfer), Photochromism,
AIEE (Aggregated Induced Enhanced Emission)
Transition Metal Complexes for Phosphorescence Emission and Photocatalytic Reaction
Materials for OLED, OTFT (Organic Thin Film Transistor), and Organic Solar
Main publications:
Researcher ID (Soo Young Park: G-1080-2012) page provides the whole list of publication and citation metrics. Click the link for direct connection. http://www.researcherid.com/rid/G-1080-2012
Awards & Honors:
2016. 5   The 25th Sudang Prize in Applied Science- Sudang Foundation
2009. 11  Academic Research Award- Seoul National University
2007. 4   Samsung Polymer Award
2005. 12  Shinyang Engineering Award
2000. 10  Best Teacher Award – College of Engineering, Seoul National University
2002. 4   Academic Progress Award – Macromolecular Chemistry Div., Korean Chemical Society.

Announced by School of Materials Science and Engineering