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Synthesis and electroluminescence property of dual core compounds for OLED emitter
정효철,이하윤,강석우,계광열,박종욱 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
We synthesis dual core (AA core) as EML material for Organic Light Emitting Devices (OLED). The effects of substituted aromatic substituents have been compared based on both materials and solid device evaluation. Its physical properties such as optical and electroluminescent properties were investigated. Two compounds were used as emitting layer (EML) in OLED device: ITO / 2-TNATA(60 nm) / NPB (15 nm) / synthesized materials (35 nm) / Alq3 (20nm) / LiF / Al. The luminance efficiency of the synthesized compound were measured 1.47cd/A for AA1 and 2.24cd/A for AA2, respectively. Moreover, the power efficiency were measured 0.38lm/W for AA1 and 0.91lm/W for AA2. the best performance with CIE(x,y)=(0.16,0.24) AA1 for, CIE(x,y)=(0.16,0.24) for AA2.
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.
Synthesis and Optical Properties of Pentacene Derivatives Using Fluorene and Carbazole Moieties
정효철,강석우,( Yang Jingjie ),박종욱 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
We substituted fluorene and carbazole moieties into pentacene compound for comparing optical and EL properties together. The molecular structure was confirmed by NMR, IR, UV-Visible spectroscopies and FAB-Mass analysis. Flu-PTC-Flu and Cz-PTC-Cz exhibited similar red PL spectrum pattern and their maximum wavelengths appeared at 627 nm and 633 nm. ITO/m-MTDATA/NPB/Alq3:Flu-PTC-Flu (5%)/LiF/Al device showed red EL spectrum at 636 nm with 0.03 cd/A efficiency. ITO/m-MTDATA/NPB/Alq3:Cz-PTC-Cz (5%)/LiF/Al device also exhibited similar red EL spectrum at same range and higher efficiency (> 0.21 cd/A) than Flu-PTC-Flu. We propose the dopant EL property of pentacene derivatives can be changed as the electronic property and steric effect of 6,13-substituted moiety in 6- and 13-positions.
Synthesis and luminescent property of bipolar organic emitters based on different core groups
정효철,신환규,김범진,안병관,김중한,박종욱 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
New OLED materials such as DPAT-Ph, DPAT-Na and DPAT-An were synthesized by through boronylation, bromination, Suzuki aryl-aryl coupling reaction and Buchwald-Hartwig amination. DPAT-An showed the largest hydrogen repulsion between a core group and a side group and the most twisted structure. Optical properties were investigated by using UV-visible spectra and photoluminescence (PL) spectra. Each compound has dipoles because it has electron donor and acceptor in the molecule and showed the solvatochromism effect. Although there was no big change in the UV-visible spectra, the more the solvent polarity was increased in the PL spectra, the more PL maximum value was red-shifted. In addition, it seemed that the more the conjugation length of a core group was increased, the more each compound tended to red-shift in the UV-visible and the PL spectra. While DPAT-Ph and DPAT-Na emitted strong light in a solution state with the naked eye, DPAT-An emitted very weak light in a solution state, but strong light in a thin film state. As a result of taking an aggregation-induced emission (AIE) active test, it was identified that DPAT-An uniquely showed AIE effect. Thermogravimetric analysis (TGA) and differential scanning calorymetry (DSC) were measured to find thermal stability. As a result, four compounds showed high thermal stability of 342~413°C in Td.
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.
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 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.