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Di 12.12.2017 17:15 Prof. Soo Young Park: Designer molecules for organic electronics 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-d
estructive 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 substitu!
ted 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).


Ort:
JKU, HS 12

Kontakt:
Prof. Dr. Günther Knör
guenther.knoer(/\t)jku.at

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