• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2006년도 영호남 합동 학술대회 및 춘계학술대회 논문집 센서 박막 기술교육
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• pp.55-60
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• 2006

Thermally stable and solution-processable poly(N-arylcarbazole-alt-aniline) copolymers with high structural integrity were synthesized in good yields via palladium-catalyzed polycondensation of aniline with corresponding N-arylcarbazole monomers such as N-(2-ethylhexyloxyphenyl)-3,6-dibromocarbazole,bis[6-bromo-N-(2-ethylhexyloxyphenyl)carbazole-3-yl] and N-(4-(2-ethylhexyl)-3,5-dibromomethylene-phenyl) carbazole, respectively. The optical and electrochemical properties of these copolymers were measured and compared with those of poly(N-alkylcarbazole-alt-aniline) copolymer. All synthesized poly(N-arylcarbazole-alt-aniline) copolymers showed maximum UV-Vis absorption peaks at around 300 nm in THF solution, and exhibited maximum photoluminescence peaks in the blue emission range from 430 to 460 nm. It was also found that poly(N-arylcarbazole-alt-aniline) copolymers had wider band gap energy than poly(N-alkylcarbazole-alt-aniline) copolymer.

• Macromolecular Research
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• 제13권5호
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• pp.403-408
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• 2005

A new terphenylenevinylene carbazylenevinylene alternating copolymer with the advantage of poly(p-phenylenevinylene) (PPV), poly(p-phenylene )(PPP) and poly(carbazole) was designed, synthesized and characterized. The polymer structure was confirmed by various spectroscopic analyses and the number average molecular weight ($M_n$) of the obtained polymer was 7,800. The resulting polymer was thermally stable with high glass transition temperature ($T_g$) ($150^{\circ}C$), and was readily soluble in common organic solvents. Cyclic voltammetry study revealed that the HOMO and LUMO energy levels of the polymer were 5.37 and 2.47 eV, respectively. The ITO/PEDOT/polymer/AI device fabricated from the polymer emitted bright sky blue light with a maximum peak of around 478 nm. The device showed the maximum brightness of 1,200 nW with a turn-on voltage of 7V.

• Bulletin of the Korean Chemical Society
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• 제31권7호
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• pp.2073-2076
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• 2010

• 폴리머
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• 제37권6호
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• pp.736-743
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• 2013

공액구조 고분자의 밴드갭을 줄이기 위하여 청색의 디페닐렌비닐렌을 치환기를 갖는 카바졸 단량체와 용해도 향상을 위해 옥틸기를 도입한 카바졸 공단량체를 합성하여 신규 공중합체를 제조하였다. Suzuki 커플링 중합으로 공중합체를 제조하고, 공중합체의 열적, 분광학적, 전기광학적 특성을 조사하여 고분자 유기발광 다이오드(PLED)의 발광층에의 사용가능성을 조사하였다. 용액상태에서 공중합체의 UV 최대 흡수 파장은 333~340 nm, PL 최대방출 파장은 409~464 nm를 보였으며, 상대양자효율은 최대 25.8%의 값을 보였다. 열중량분석 결과 $350^{\circ}C$까지 열안정성을 보이고, 필름형성이 용이하였으며, 공중합체를 발광층으로 사용한 PLED 소자에서 4.0 V에서 청색광을 나타내었다.

• Bulletin of the Korean Chemical Society
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• 제30권4호
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• pp.951-954
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• 2009

• 접착 및 계면
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• 제18권3호
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• pp.109-117
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• 2017

본 연구에서는 poly(N-vinyl carbazole) (PVK), poly(4-vinylpyridine) (PVP), PVK-b-PVP 블록 공중합체를 RAFT 중합법으로 합성하였으며, 이를 이용하여 ethanol, N-methyl-2-pyrrolidone (NMP), dichloromethane (DCM), tetrahydrofuran (THF)와 같은 비 수계 용매에서 그래핀 분산액을 제조하였다. 합성된 고분자의 화학적 구조는 양성자 및 탄소 핵자기 공명 분광기($^1H-$, $^{13}C-NMR$), 크기 배제 크로마토그래피 (size exclusive chromatography, SEC), 시차 주사 열량계 (differential scanning calorimetry, DSC)를 이용하여 분석하였으며, 그래핀 분산액의 분산 안정성은 Turbiscan을 이용하여 시간에 따른 터비스캔 안정성 지수(Turbiscan stability index, TSI)를 측정, 정량적으로 평가하였다. 용매, 고분자, 그래핀의 표면장력(${\sigma}$), 용해도 상수(${\delta}$)를 이용하여 물질간의 상호작용에 대하여 설명하였으며, 이를 바탕으로 용매와 그래핀간의 용해도와 표면장력의 차이가 분산안정성에 큰 영향을 미침을 확인하였다. 그래핀의 분산 안정성이 좋지 못한 ethanol 및 THF 용매 하에서 PVK-b-PVP를 사용하여 그래핀을 분산시킬 경우 낮은 TSI값을 효과적으로 유지할 수 있었으며, 그래핀을 잘 분산시킨다고 알려진 NMP에 비하여 DCM이 더 좋은 그래핀 분산안정성을 보임을 확인하였다.

• 공업화학
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• 제24권4호
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• pp.396-401
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• 2013

Benzo[1,2,5]thiadiazole, carbazole 및 phenanthrene을 기본 골격으로 한 교대공중합체인 poly[9-(2-octyl-dodecyl)-9H-carbazole-alt-4,7-di-thiophen-2-yl-benzo[1,2,5]thiadiazole] (PCD20TBT)와 poly[9,10-bis-(2-octyl-dodecyloxy)-phenanthrene-alt-4,7-di-thiophen-2-yl-benzo[1,2,5]thiadiazole] (PN40TBT)을 Suzuki coupling reaction을 이용하여 중합하였다. 합성한 고분자들은 chloroform, chlorobenzene, 1,2-dichlorobenzene, tetrahydrofuran, toluene과 같은 유기용매에 대한 용해도가 우수하였다. PCD20TBT의 최대흡수 파장과 밴드갭은 각각 535 nm와 1.75 eV이고, PN40TBT의 최대흡수 파장과 밴드갭은 각각 560 nm과 1.97 eV이었다. PCD20TBT의 HOMO 및 LUMO 에너지준위는 각각 - 5.11 eV와 - 3.36 eV이고, PN40TBT의 HOMO 및 LUMO 에너지준위는 각각 -5.31 eV와 -3.34 eV이었다. 합성한 고분자와 (6)-1-(3-(methoxycarbonyl)-{5}-1-phenyl[5,6]-fullerene(PCBM)을 1:2의 중량비로 블랜딩하여 제작한 이종접합형태(bulk heterojunction) 태양전지를 제작하였다. PCD20TBT의 광전변환효율은 0.52%, PN40TBT의 광전변환효율은 0.60%이었다. 그리고 소자의 단락 전류밀도, 충진 인자와 개방전압은 PCD20TBT가 각각 $-1.97mA/cm^2$, 38.2%, 0.69 V이며, PN40TBT의 경우 각각 $-1.77mA/cm^2$, 42.9%, 0.79 V이었다.

• Bulletin of the Korean Chemical Society
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• 제33권2호
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• pp.629-635
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• 2012

Two novel conjugated copolymers utilizing 4,7-dithien-2-yl-2,1,3-benzothiadiazole (DTBT) coupled with cyano (-CN) substituted vinylene, as the electron deficient moeity, have been synthesized and evaluated in bulk heterojunction solar cell. The electron deficient moeity was coupled with carbazole and fluorene unit by Knoevenagel condition to provide poly(bis-2,7-((Z)-1-cyano-2-(5-(7-(2-thienyl)-2,1,3-benzothiadiazol-4-yl)-2-thienyl)ethenyl)-alt-9-(1-octylnonyl)-9H-carbazol-2-yl-2-butenenitrile) (PCVCNDTBT) and poly(bis-2,7-((Z)-1-cyano-2-(5-(7-(2-thienyl)-2,1,3-benzothiadiazol-4-yl)-2-thienyl)ethenyl)-alt-9,9-dihexyl-9H-fluoren-2-yl) (PFVCNDTBT). The optical band gaps of PCVCNDTBT (1.74 eV) and PFVCNDTBT (1.80 eV) are lower than those of PCDTBT (1.88 eV) and PFVDTBT (2.13 eV), which is advantageous to provide better coverage of the solar spectrum in the longer wavelength region. The high $V_{oc}$ value of the PSC of PCVCNDTBT (~0.91 V) is attributed to its lower HOMO energy level ( 5.6 eV) as compared to PCDTBT ( 5.5 eV). Bulk heterojunction solar cells based on the blends of the polymers with [6,6]phenyl-$C_{61}$-butyric acid methyl ester ($PC_{61}BM$) gave power conversion efficiencies of 0.76% for PCVCNDTBT under AM 1.5, 100 mW/$cm^2$.

• Bulletin of the Korean Chemical Society
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• 제34권9호
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• pp.2609-2615
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• 2013

A series of fluorene-carbazole copolymers containing the pendant phosphor chromophore $Ir(absn)_2(acac)$ (absn: 2-(1-naphthyl)benzothiazole; acac: acetylacetone) were designed and synthesized via Yamamoto coupling. In the film state, these copolymers exhibited absorption and emission peaks at approximately 389 and 426 nm, respectively, which originated from the fluorene backbone. However, in electroluminescent (EL) devices, a significantly red-shifted emission at approximately 611 nm was observed, which was attributed to the pendant iridium(III) complex. Using these copolymers as a single emission layer, polymer light-emitting devices with ITO/PEDOT:PSS/polymer:DNTPD/TmPyPb/LiF/Al configurations exhibited a saturated red emission at 611 nm. The attached iridium(III) complex had a significant effect on the EL performance. A maximum luminous efficiency of 0.85 cd/A, maximum external quantum efficiency of 0.77, maximum power efficiency of 0.48 lm/W, and maximum luminance of 883 $cd/m^2$ were achieved from a device fabricated with the copolymer containing the iridium(III) complex in a 2% molar ratio.