기존 organic light emitting diodes(OLED) 소자의 양극 전극으로 사용되던 인듐주석산화물(ITO) 전극을 대신하여 polyethersulfone(PES)기판 표면 위에서 단량체인 ...
기존 organic light emitting diodes(OLED) 소자의 양극 전극으로 사용되던 인듐주석산화물(ITO) 전극을 대신하여 polyethersulfone(PES)기판 표면 위에서 단량체인 3,4-ethylenedioxythiophene (EDOT)을 직접 중합하여 thiophene 계열의 전도성 고분자인 poly(3,4-ethylenedioxythiophene)-Iron(Ⅲ)tosylate(PEDOT-FTS) 필름을 형성하고 이를 양극전극으로 사용한 flexible OLED소자를 제작하였다. PEDOT-FTS필름을 중합하는 과정에서 희석용매(BuOH)의 양을 조절하여 두께, 투과도와 전도도를 조절할 수 있었고, 부가용매로 dimethylacetamide(DMAc)를 첨가하여 투과도와 전도도를 향상 시킬 수 있었다. X선 광전자 분광분석기(XPS), 라만분광분석, 원자력현미경(AFM) 등을 통하여 DMAc의 첨가에 의해 PEDOT-FTS필름의 형태를 변화를 가져오고 이 결과 필름 내 PEDOT-FTS 사슬의 packing density가 증가함에 의한 사슬과 사슬간의 전하 수송체 이동도의 증가와 이러한 형태의 변화에 따른 benzoid에서 quinoid로의 PEDOT 사슬의 구조변화에 의한 공액이중 결합 길이의 증가 효과가 전도도 향상의 결과를 나타낼 수 있음을 확인하였다. 또한 XPS결과를 통해 DMAc첨가된 경우 PEDOT-FTS 필름의 도핑레벨이 증가하였음을 확인하였고, 이 또한 전도도 향상의 원인으로 생각할 수 있다. 이와 같은 연구를 토대로 OLED소자에 적합한 PEDOT-FTS필름을 제작하였고 이를 전극으로 하여 녹색발광물질인 Alq3를 발광 층으로 한 flexible OLED소자를 제작하였다. 소자의 최대 휘도는 4500 cd/m2을 나타내었고, 150 mA/cm2의 전류밀도에서 1.2 cd/A의 휘도 효율과 0.24%의 외부양자효율을 보였다.
기존 organic light emitting diodes(OLED) 소자의 양극 전극으로 사용되던 인듐주석산화물(ITO) 전극을 대신하여 polyethersulfone(PES)기판 표면 위에서 단량체인 3,4-ethylenedioxythiophene (EDOT)을 직접 중합하여 thiophene 계열의 전도성 고분자인 poly(3,4-ethylenedioxythiophene)-Iron(Ⅲ)tosylate(PEDOT-FTS) 필름을 형성하고 이를 양극전극으로 사용한 flexible OLED소자를 제작하였다. PEDOT-FTS필름을 중합하는 과정에서 희석용매(BuOH)의 양을 조절하여 두께, 투과도와 전도도를 조절할 수 있었고, 부가용매로 dimethylacetamide(DMAc)를 첨가하여 투과도와 전도도를 향상 시킬 수 있었다. X선 광전자 분광분석기(XPS), 라만분광분석, 원자력현미경(AFM) 등을 통하여 DMAc의 첨가에 의해 PEDOT-FTS필름의 형태를 변화를 가져오고 이 결과 필름 내 PEDOT-FTS 사슬의 packing density가 증가함에 의한 사슬과 사슬간의 전하 수송체 이동도의 증가와 이러한 형태의 변화에 따른 benzoid에서 quinoid로의 PEDOT 사슬의 구조변화에 의한 공액 이중 결합 길이의 증가 효과가 전도도 향상의 결과를 나타낼 수 있음을 확인하였다. 또한 XPS결과를 통해 DMAc첨가된 경우 PEDOT-FTS 필름의 도핑레벨이 증가하였음을 확인하였고, 이 또한 전도도 향상의 원인으로 생각할 수 있다. 이와 같은 연구를 토대로 OLED소자에 적합한 PEDOT-FTS필름을 제작하였고 이를 전극으로 하여 녹색발광물질인 Alq3를 발광 층으로 한 flexible OLED소자를 제작하였다. 소자의 최대 휘도는 4500 cd/m2을 나타내었고, 150 mA/cm2의 전류밀도에서 1.2 cd/A의 휘도 효율과 0.24%의 외부양자효율을 보였다.
We fabricated flexible OLEDs using an conducting polymer, poly(3,4-ethylenedioxythiophene)-Iron(Ⅲ)tosylate (PEDOT-FTS) as an anode. The PEDOT-FTS film was obtained by in-situ polymerization of 3,4-ethylenedioxythiophene (EDOT) monomers on the polyethersulfone (PES) substrate. We were able to contro...
We fabricated flexible OLEDs using an conducting polymer, poly(3,4-ethylenedioxythiophene)-Iron(Ⅲ)tosylate (PEDOT-FTS) as an anode. The PEDOT-FTS film was obtained by in-situ polymerization of 3,4-ethylenedioxythiophene (EDOT) monomers on the polyethersulfone (PES) substrate. We were able to control the thickness, transmittance, and electrical conductivity of the film during the polymerization process by adjustment of the solvent (BuOH) content. We were also able to enhance the electrical and optical properties of the film by addition of the dimethylacetamide (DMAc) as a co-solvent.
The poly(3,4-ethylenedioxythiophene) (PEDOT) film polymerized in the presence of DMAc showed higher electrical conductivity and transmittance than that polymerized without DMAc. The underlying mechanism for this conductivity enhancement was studied through various chemical and physical characterizations. From the atomic force microscopic (AFM) study, it was found that the PEDOT film prepared in the presence of DMAc has more densely packed and smoother surface than that prepared without DMAc. This change may be attributed to the conformational change of PEDOT. As a consequence of higher packing density of PEDOT molecules, the PEDOT film has better molecular interconnectivity and the charge carrier can move faster by inter-chain hopping. Also, x-ray photoelectron spectroscopic (XPS) analysis revealed spectral differences between the PEDOT films polymerized with and without DMAc. It is likely that the interaction between DMAc and growing PEDOT chains altered the coil conformation of PEDOT chains to linear or expanded-coil conformation, causing benzoid-to-quinoid structural change to give a higher electrical conductivity.
The PEDOT-FTS substrate which has the surface resistance of 340 Ω/sq and the transmittance of 88% at the 520 nm wavelength was prepared on the basis of such experiments and the green-emitting flexible OLEDs using the PEDOT-FTS film as an electrode with the Alq3 emitting layer ware fabricated. The flexible OLEDs showed the max luminance of 4500 cd/m2, and the luminous efficiency of 1.2 cd/A and the external quantum efficiency of 0.24% at the current density of 150 mA/cm2.
We fabricated flexible OLEDs using an conducting polymer, poly(3,4-ethylenedioxythiophene)-Iron(Ⅲ)tosylate (PEDOT-FTS) as an anode. The PEDOT-FTS film was obtained by in-situ polymerization of 3,4-ethylenedioxythiophene (EDOT) monomers on the polyethersulfone (PES) substrate. We were able to control the thickness, transmittance, and electrical conductivity of the film during the polymerization process by adjustment of the solvent (BuOH) content. We were also able to enhance the electrical and optical properties of the film by addition of the dimethylacetamide (DMAc) as a co-solvent.
The poly(3,4-ethylenedioxythiophene) (PEDOT) film polymerized in the presence of DMAc showed higher electrical conductivity and transmittance than that polymerized without DMAc. The underlying mechanism for this conductivity enhancement was studied through various chemical and physical characterizations. From the atomic force microscopic (AFM) study, it was found that the PEDOT film prepared in the presence of DMAc has more densely packed and smoother surface than that prepared without DMAc. This change may be attributed to the conformational change of PEDOT. As a consequence of higher packing density of PEDOT molecules, the PEDOT film has better molecular interconnectivity and the charge carrier can move faster by inter-chain hopping. Also, x-ray photoelectron spectroscopic (XPS) analysis revealed spectral differences between the PEDOT films polymerized with and without DMAc. It is likely that the interaction between DMAc and growing PEDOT chains altered the coil conformation of PEDOT chains to linear or expanded-coil conformation, causing benzoid-to-quinoid structural change to give a higher electrical conductivity.
The PEDOT-FTS substrate which has the surface resistance of 340 Ω/sq and the transmittance of 88% at the 520 nm wavelength was prepared on the basis of such experiments and the green-emitting flexible OLEDs using the PEDOT-FTS film as an electrode with the Alq3 emitting layer ware fabricated. The flexible OLEDs showed the max luminance of 4500 cd/m2, and the luminous efficiency of 1.2 cd/A and the external quantum efficiency of 0.24% at the current density of 150 mA/cm2.
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