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BCP의 증착 조건에 따른 광학적 특성 및 전도 기구에 미치는 영향
김원종,홍진웅,Kim, Weon-Jong,Hong, Jin-Woong 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.11
In a triple-layered structure of ITO/N,N'-diph enyl-N,N'bis(3-methylphenyl)-1,1' - biphenyl-4,4'-diamine(TPD)/tris(8-hydroxyquinoline)aluminum($Alq_3$)/(2,9-Dimethyl-4,7-diphenyl-1,10-phenanthroline(BCP)/Al device, we have studied the electrical and optical characteristics of organic light-emitting diodes(OLEDs) depending on the deposition condition of BCP layer. Several different sizes of holes on boat and several different deposition rates were employed in evaporating the organic materials. And then, electrical properties of the organic light-emitting diodes were measured and the performance of the devices was analyzed. It was found that the hole-size of crucible boat and the evaporation rate affect on the surface roughness of BCP layer as well as the performance of the device. When the hole-size of crucible boat and the deposition rate of BCP are 1.2 mm and $1.0\;{\AA}/s$, respectively, average surface roughness of BCP layer is lower and the efficiency of the device is higher than the ones made with other conditions. From the analysis of current density-luminance-voltage characteristics of a triple layered device, we divided the conductive mechanism by four region according to applied voltage. So we have obtained a coefficient of ${\beta}_{ST}$ in schottky region is $3.85{\times}10^{-24}$, a coefficient of ${\beta}_{PF}$ in Poole-Frenkel region is $7.35{\times}10^{-24}$, and a potential barrier of ${\phi}_{FN}$ in Fower-Nordheim region is 0.39 eV.
정공 주입 물질 두께 변화에 따른 유기 발광 다이오우드 효율 향상
김원종(Weon-Jong Kim),이영환(Young-Hwan Lee),차기호(Ki-Ho Cha),이상교(Sang-Kyo Lee),김태완(Tae-Wan Kim),홍진웅(Jin-Woong Hong) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
In the structure of ITO/HIL/Alq₃/Al device, we investigated an efficiency improvement of the Organic Light-Emitting Diodes depending on thickness variation of hole-injection layer. Using the thermal evaporation in a base vacuum 5×10?? [Torr], we have measured efficiency after the Alq₃ was evaporated to 100[㎚] as a deposition rate 1.5 [A/s]. In optimal condition, when PTFE thickness increased from 0 to 3.0[㎚], we have obtained that an optimal thickness of PTFE was 2.5[㎚]. And using the PTFE, luminance efficiency and external quantum efficiency of the device were improved by 12.8 times and 11.1 times, respectively.
Crucible Boat 홀 크기와 정공 수송층 증착속도에 따른 유기밭광 다이오드의 전기적 특성
김원종,신현택,신종열,홍진웅,Kim, Weon-Jong,Shin, Hyun-Teak,Shin, Jong-Yeol,Hong, Jin-Woong 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.1
In the structure of ITO/N,N'-diphenyl-N,N' bis (3-methylphenyl)-1,1'-biphenyl-4,4'-diamine(TPD)/tris (8-hydroxyquinoline)aluminum($Alq_3$)/Al device, we studied the efficiency improvement of organic light-emitting diodes due to variation of deposition rate of hole transport layer (TPD) materials using hole-size of crucible boat. The thickness of TPD and $Alq_3$ was manufactured 40 nm, 60 nm, respectively under a base pressure of $5{\times}10^{-6}$ Torr using a thermal evaporation. The $Alq_3$ used for an electron-transport and emissive layer were evaporated to be at a deposition rate of $2.5\;{\AA}/s$. When the deposition rate of TPD increased from 1.5 to $3.0\;{\AA}/s$, we studied the efficiency improvement of TPD using the hole-size of crucible is 1.0 mm. When the deposition rate of TPD is $2.5\;{\AA}/s$, we found that the average roughness is rather smoother, the luminous efficiency the external quantum efficiency is superior to the others. Compared to the two from the devices made with the deposition rate of TPD is $2.0\;{\AA}/s$ and $3.0\;{\AA}/s$, the external quantum efficiency was improved by four-times and two-times, respectively.
Crucible Boat의 홀 크기에 따른 유기발광소자의 효율 개선
김원종,홍진웅,Kim, Weon-Jong,Hong, Jin-Woong 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.6
In the device structure of ITO/tris(8-hydroxyquinoline) aluminum ($Alq_3$)/Al device, we investigated the efficiency improvement of organic light-emitting diodes (OLEDs) depending on the hole-size of crucible boat. The device was manufactured using a thermal evaporation under the base pressure of $5{\times}10^{-6}\;Torr$. The $Alq_3$ organics were evaporated to be 100 nm thick at a deposition rate of $1.5\AA/s$, and in order to investigate the optimal surface roughness of $Alq_3$, the $Alq_3$ was thermally evaporated to be 0.8 mm, 1.0 mm, and 1.5 mm as a hole-size of the boat, respectively. We found that luminance and external quantum efficiency are superior when the hole-size of the boat is 1.0 mm. The external quantum efficiency of the device made with the hole-size of 1.0 mm boat were improved by a factor of ten compared to the devices made with the hole-size of non boat.
전자 수송층 BCP의 두께변환에 따른 유기발광소자 효율 개선
김원종,신현택,홍진웅,Kim, Weon-Jong,Shin, Hyun-Teak,Hong, Jin-Woong 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.4
In the devices structure of ITO/N,N'-diphenyl-N,N' bis (3-methylphenyl)-1,1'-biphenyl-4,4'-diamine (TPD) /tris (8-hydroxyquinoline)aluminum$(Alq_3)$electron-transport-layer(ETL)(2,9-Dimethyl-4,7-diphenyl-1,10-phenanthroline(BCP))/Al, we have studied the efficiency improvement of organic light-emitting diodes depending on the thickness variation of BCP using electron transport layer. The thickness of TPD and $Alq_3$ was manufactured 40 nm, 60 nm under a base pressure of $5{\times}10^{-6}$ Torr using at thermal evaporation, respectively. The TPD and $Alq_3$ layer were evaporated to be deposition rate of $2.5{\AA}/s$. And the BCP was evaporated to be a4 a deposition of $1.0{\AA}/s$. As the experimental results, we found that the luminous efficiency and the external quantum efficiency of the device is superior to others when thickness of BCP is 5 nm. Also, operating voltage is lowest. Compared to the ones from the devices without BCP layer, the luminous efficiency and the external quantum efficiency were improved by a factor of four hundred ninty and five hundred, respectively. And operating voltage is reduced to about 2 V.
K-means 군집화 기법을 이용한 개폐장치의 부분방전 패턴 해석
변두균,김원종,이강원,홍진웅,Byun, Doo-Gyoon,Kim, Weon-Jong,Lee, Kang-Won,Hong, Jin-Woong 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.10
In this study, we measured the partial discharge phenomenon of inside the closed switchgear, using ultra wide band antenna. The characteristics of $\Phi-q-n$ in the normal state are stable, and confirmed at less than 0.01, but in proceeding states, about 2 times larger. And in the abnormal state, it grew hundreds of times larger compared with normal state. According to K-means analysis, if slant of discharge characteristics is a straight line close to "0" and standard deviation is small, it is in a normal state. However if we can find a peak from K-means clusters and standard deviation to be large, it is in an abnormal state.
유기발광 소자에서 유기층의 두께 및 증착속도 변화에 따른 전기적 특성
이영환,김원종,양재훈,신종열,김태완,홍진웅,Lee, Young-Hwan,Kim, Weon-Jong,Yang, Jae-Hoon,Shin, Jong-Yeol,Kim, Tae-Wan,Hong, Jin-Woong 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.4
OLEDs(Organic Light Emitting Diodes) are attractive as alternative display components because of their relative merits of being self-emitting, having large intrinsic viewing angle and fast switching speed. But because of their relatively short history of development, much remains to be studied in terms of their basic device physics and design, manufacturing techniques, stability and so on. We investigated electrical properties of N, N-diphenyl-N, N bis (3-methyphenyl-l,1'-biphenyl-4,4'-diamine (TPD) and tris-8-hydroxyquinoline aluminum$(Alq_3)$ when their thicknesses were changed variedly from 3:7 to 5:5 of their thickness ratios. And we also studied properties of OLED depend on their deposition rate between $0.05{\sim}0.2$ nm/s.