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Synthesis and electroluminescence properties of pyrene derivatives using different link-position
정효철,정미나,이재현,박종욱 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
TB-1,6P-TB, TB-1,8P-TB, and TB-4,9P-TB were synthesized by boration, bromination, and Suzuki aryl-aryl coupling. Optical properties were examined by UV-Vis. absorption spectra and PL spectra. The UV-Vis. absorption spectra of TB-1,6P-TB, TB-1,8P-TB, and TB-4,9P-TB showed maximum absorption wavelength of 373, 373, and 358 nm in film states. The PL spectra of TB-1,6P-TB, TB-1,8P-TB, and TB-4,9P-TB showed maximum emission wavelengths of 461, 461, and 428 nm in film states. A non-doped OLED was fabricated using the synthesized material as an emitting material. TB-1,6P-TB, TB-1,8P-TB, and TB-4, 9P-TB exhibited current efficiency of 4.19, 5.16, and 2.06 cd/A.
Electro-optical and electrochemical properties of Poly(9,9-dipropargylfluorene)
정효철,제갈영순,진성호,심상연,박영일,박종욱 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
For many years, considerable research efforts have been dedicated to various types of conjugated polymers because of their extraordinary electronic and optical properties. Here, a conjugated cyclopolymer, poly(9,9-dipropargylfluorene), was prepared by the cyclopolymerization of 9,9-dipropargylfluorene by various transition metal catalysts. The cyclic voltamograms of the polymer exhibited reversible electrochemical behaviors between the doped and undoped peaks. It was found that the kinetics of the redox process of polymer is controlled by the diffusion process mixed with the electron transfer process from the experiment of the oxidation current density of polymer vs the scan rate. This polymer showed characteristic UV-vis absorption band at 307 and 324 nm and violet-blue PL spectrum at 411 nm, corresponding to a photon energy of 3.01 eV.
정효철,신환규,김범진,김중한,안병관,박종욱 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
New OLED materials such as DPAT-Ph, DPAT-Na, and DPAT-An were synthesized. Each compound has dipoles because it has a electron donor and electron acceptor in a molecule. So, they showed solvatochromism. DPAT-Ph and DPAT-Na emitted strong light in a solution state. But, while DPAT-An emitted very weak light in a solution state, it emitted strong light in a thin film state. As a result of taking an aggregationinduced emission (AIE) active test, it was identified that DPAT-An uniquely showed AIE phenomenon. DPAT-Ph showed ELmax of 469 nm in a sky-blue region. It showed 3.71 cd/A, 2.07 lm/W and E.Q.E of 3.61 %. DPAT-Na and DPAT-An exhibited ELmax of 502 and 547nm which is from yellow to yellowish green range. DPAT-Na and DPAT-An showed the high luminance efficiency of 8.09 and 17.97 cd/A and E.Q.E of 3.10 and 5.20 %. They also showed 3.74 and 8.20 lm/W. Especially, DPAT-An exhibited long device lifetime of 1380 hours.
Synthesis and Electroluminescent Properties of Spirofluorene and Carbazole Derivatives for OLEDs
정효철,강석우,( Yang Jingjie ),박종욱 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
We synthesized spirobifluorene and carbazole derivatives such as 5Ph-ECz-5Ph, Fr-ECz-Fr, 5Ph-SF-5Ph, and Fr-SF-Fr, through Diels-Alder reaction. The molecular structure was confirmed by nuclear magnetic resonance (NMR), elemental analysis (EA), UV-Visible, PL spectroscopies. Fr-ECz-Fr exhibited sky blue PL emission at 481nm and 5Ph-SF-5Ph exhibited ultra-violet PL emission at 374nm in CHCl<sub>3</sub> solution, but 5Ph-ECz-5Ph and Fr-SF-Fr showed PL spectra at around 390 and 467, respectively. PL spectra at around 390 and 467, respectively. In nondoped device, 5Ph-ECz-5Ph and Fr-SF-Fr as emitting material showed 1.6 cd/A and 1.7 cd/A, respectively.
정효철,이하윤,강석우,계광열,박종욱 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Di-1-NAA-DBDA and Di-2-NAA-DBDA were designed and synthesized based on anthracenes and dibenzo-diazocine moiety. In solution state, Di-1-NAA-DBDA and Di-2-NAA-DBDA showed PL spectra in the range of 416 nm ~ 420 nm and showed PL spectra in the range of 435 nm ~ 438 nm in the film state. Applying Di-1-NAA-DBDA and Di-2-NAADBDA to non-doped OLED device as an emitting layer, two emitters showed current efficiencies of 1.39 cd A-1 and 2.38 cd A-1 and EL maximum wavelength of 475 nm and 478 nm, respectively.
Synthesis and Electroluminescent Properties of Coumarin derivatives for OLEDs
정효철,이하윤,강석우,계광열,박종욱 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
In this study, Ph-An-Me, 1-Na-An-MeC, 2-Na-An-MeC, and An-C, were designed and synthesized through Suzuki coupling reaction. Four compounds showed photoluminescence (PL) maximum wavelength of 461nm~472nm in solution state, and photoluminescence (PL) maximum wavelength of 456nm~475nm in the film state. Four materials were used as emitting layer (EMLs) n non-doped OLEDs with the following structures: ITO/2-TNATA (60 nm)/NPB (15 nm)/EMLs (35 nm)/Alq3 (20 nm)/LiF (1 nm)/Al (200 nm). Non-doped devices showed luminescence efficiency of 2.14, 2.07, 1.52, and 1.12 cd A-1 at a current density of 10 mA cm-2.