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Solution-processable Dithieno[3,2-b:2',3'-d]thiophene Derivatives for OTFTs
서성용 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Solution-processable dithieno[3,2-b:2’,3’-d]thiophene (DTT) derivatives, 2,6-bis(phenylethynyl)dithieno[3,2-b:2',3'-d]thiophene (BP-Et-DTT) and 2,6-bis(thiophen-2-ylethynyl)dithieno[3,2-b:2',3'-d]thiophene (BT-Et- DTT) were synthesized and characterized as solution-processable organic semiconductors for organic thin-film transistors (OTFTs). Thermal, optical, and electrochemical properties of the DTT-based semiconductors were investigated. The solution-sheared thin films based on DTT derivatives exhibited p-channel characteristics as an active layer in organic thin-film transistors. The highest hole mobility was 0.32 cm2 V-1s<sup>-1</sup> based on BP-Et-DTT thin films. The thin films exhibited micrometer-sized crystalline fiber structures which were aligned along the shearing direction, resulting in fiber-alignmentinduced charge-transport anisotropy.
서성용 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
An organic compound having carbazole, dibenzofuran, thiophene, and diphenylphosphine oxide, (5-(8-(9H-carbazole-9-yl)dibenzo[b,d]furan- 2-yl)thiophene-2-yl)diphenylphosphine oxide(CFTPO) was synthesized and employed as a yellow host material to harvest triplet excitons from yellow triplet emitters. The CFTPO material is a bipolar host material because it includes carbazole and diphenylphosphine oxide charge transport units with both a high triplet energy 2.47eV and a high quantum efficiency of 24.7% in yellow phosphorescent device.
Stereoselective Tandem Intramolecular Conjugate Addition of Various Nucleophiles to α,β-bisenones
서성용 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
We report an indium triflate-catalyzed and lithium-mediated stereoselective intramolecular tandem conjugate addition of various nucleophiles to α, β-bisenones to afford a 1,2,3-trisubstituted six-membered ring bearing diketone substituents in good to excellent yields at room temperature. Various kinds of α,β-bisenones and nucleophiles were employed to expand the scope of this chemistry. Intramolecular trapping of metal-enolate by the tethered electrophiles resulted in the stereoselective formation of three contiguous stereogenic centers.
Synthesis and characterization of quinoxaline derivative for high-performance PHOLEDs
서성용 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
A novel bipolar donor-acceptor-donor (D-A-D) type quinoxaline derivative, 2,3-di(9H-carbazol-9-yl)quinoxaline (DCQ) was designed and synthesized. The spectroscopic, thermal, photophysical and electrochemical properties of DCQ were systematically investigated. DCQ was employed as a yellow host material for phosphorescent organic light emitting diodes (PHOLEDs) having both a good electron and hole transport properties. Importantly, DCQ as a host material exhibits excellent device performance having a triplet energy of 2.46 eV The maximum quantum efficiency of 24.6% at 3% doping concentration and power efficiency of 49.6 lm/W at 5% doping concentration in yellow phosphorescent device.
Chemical Analysis of Ionic Liquids Using Photoelectron Spectroscopy
서성용,Ju-Yun Park,강용철 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.3
The feasibility of utilizing X-ray photoelectron spectroscopy (XPS) to analyze room-temperature ionic liquids (RTILs) was investigated in this study. Conventionally, the chemical structure of organic compounds is identified by nuclear magnetic resonance (NMR) spectroscopy. The properties of RTILs, especially their low vapor pressure, make it possible to analyze RTILs by using XPS. The usefulness of XPS on RTILs was confirmed by commercial RTILs. All atoms in RTILs were detected in survey XPS spectra, and the calculated atomic percentages matched well with theoretical values. After the verification of commercial RTILs by XPS, we synthesized three RTILs and investigated them with XPS. The atomic ratio and chemical environment of carbon in RTILs were verified by XPS. By adapting XPS to the investigation of RTILs, carbon atoms in different chemical environments were distinguishable by the binding energy shift, and the atomic ratio of the constituent atoms was identifiable after peak deconvolution. In addition, inorganic constituents were detected by XPS unlike in the case of NMR spectroscopy.