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[TCTA-TAZ] : Ir(ppy)<sub>3</sub> 이중 발광층을 갖는 고효율 녹색 인광소자의 제작과 특성 평가
신상배,신현관,김원기,장지근,Shin, Sang-Baie,Shin, Hyun-Kwan,Kim, Won-Ki,Jang, Ji-Geun 한국재료학회 2008 한국재료학회지 Vol.18 No.4
High-efficiency phosphorescent organic light emitting diodes using TCTA-TAZ as a double host and $Ir(ppy)_3$ as a dopant were fabricated and their electro-luminescence properties were evaluated. The fabricated devices have the multi-layered organic structure of 2-TNATA/NPB/(TCTA-TAZ) : $Ir(ppy)_3$/BCP/SFC137 between an anode of ITO and a cathode of LiF/AL. In the device structure, 2-TNATA[4,4',4"-tris(2-naphthylphenyl-phenylamino)-triphenylamine] and NPB[N,N'-bis(1-naphthyl)-N,N'-diphenyl-1,1'-biphenyl-4,4'-diamine] were used as a hole injection layer and a hole transport layer, respectively. BCP [2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline] was introduced as a hole blocking layer and an electron transport layer, respectively. TCTA [4,4',4"-tris(N-carbazolyl)-triphenylamine] and TAZ [3-phenyl-4-(1-naphthyl)-5-phenyl-1,2,4-triazole] were sequentially deposited, forming a double host doped with $Ir(ppy)_3$ in the [TCTA-TAZ] : $Ir(ppy)_3$ region. Among devices with different thickness combinations of TCTA ($50\;{\AA}-200\;{\AA}$) and TAZ ($100\;{\AA}-250\;{\AA}$) within the confines of the total host thickness of $300\;{\AA}$ and an $Ir(ppy)_3$-doping concentration of 7%, the best electroluminescence characteristics were obtained in a device with $100\;{\AA}$-think TCTA and $200\;{\AA}$-thick TAZ. The $Ir(ppy)_3$ concentration in the doping range of 4%-10% in devices with an emissive layer of [TCTA ($100\;{\AA}$)-TAZ ($200\;{\AA}$)] : $Ir(ppy)_3$ gave rise to little difference in the luminance and current efficiency.
고효율 $CBP:Ir(ppy)_3$-PhOLEDs의 제작과 특성 연구
장지근,신상배,신현관,안종명,장호정,유상욱,Jang, Ji-Geun,Shin, Sang-Baie,Shin, Hyun-Kwan,Ahn, Jong-Myoung,Chang, Ho-Jung,Ryu, Sang-Ouk 한국마이크로전자및패키징학회 2008 마이크로전자 및 패키징학회지 Vol.15 No.2
고효율 녹색 인광 유기발광다이오드를 개발하기 위해 소자 구조를 ITO/2-TNATA/NPB/TCTA/CBP:$7%Ir(ppy)_3$/BCP/SFC-137/LiF/Al로 설계 제작하고 그 전계발광 특성을 평가하였다. 소자 제작에서 발광 호스트의 두께를 $150{\AA}{\sim}350{\AA}$ 범위로 변화시켜, 전계발광 특성을 비교해 본 결과, CBP두께가 약 $300{\AA}$ 부근일 때 가장 우수한 휘도 특성이 얻어졌다 전류 효율은 CBP두께가 $300{\AA}{\sim}350{\AA}$범위일 때 거의 포화되어 최대로 나타났다. $CBP(300{\AA}):7%Ir(ppy)_3-EML$ 층을 갖는 PhOLED(phosphorescent organic light emitting diode)의 전류 밀도, 휘도, 그리고 전류 효율은 10V의 인가전압에서 각각 $40mA/cm^2,\;10000cd/m^2$, 25cd/A로 나타났다. 또한 이 소자의 최대 전류효율은 $160cd/m^2$의 휘도 상태에서 40.5cd/A로 나타났다. 발광 스펙트럼은 512nm의 중심 파장과 약 60nm의 FWHM(Full Width Half Maximum)을 나타내었으며, CIE (Commission Internationale de I'Eclairage)도표 상에서 색 좌표는 (0.28,0.63)으로 나타났다. New devices with the structure of ITO/2-TNATA/NPB/TCTA/CBP:$7%Ir(ppy)_3$/BCP/SFC-137/LiF/Al were designed and fabricated to develop high efficiency green phosphorescent organic light emitting diodes and their electroluminescence properties were evaluated. Among the devices with different thicknesses of CBP in a range of $150{\AA}{\sim}350{\AA}$, the best luminance was obtained in the device with $300{\AA}$-thick CBP host. Nearly saturated current efficiencies indicates that the maximum efficiency value can be obtained with CBP thicknesses of $300{\AA}{\sim}350{\AA}$. The current density, luminance, and current efficiency of the PhOLED(phosphorescent organic light emitting diode) with $CBP(300{\AA}):7%Ir(ppy)_3-emissive$ layer at an applied voltage of 10V were $40mA/cm^2,\;10000cd/m^2$, and 25 cd/A, respectively. The maximum current efficiency was 40.5cd/A under the luminance of $160cd/m^2$. The peak wavelength and FWHM(full width at half maximum) in the electroluminescence spectral were 512nm and 60nm, respectively. The color coordinate was (0.28, 0.63) on the CIE (Commission Internationale de I'Eclairage) chart.
장지근,김원기,신상배,신현관,Jang, Ji-Geun,Kim, Won-Ki,Shin, Sang-Baie,Shin, Hyun-Kwan 한국반도체디스플레이기술학회 2008 반도체디스플레이기술학회지 Vol.7 No.3
New devices with structure of ITO/2TNATA/NPB/TCTA/CBP:7%Ir(ppy)$_3$/BCP/ETL/LiF/Al were proposed to develop high luminous green phosphorescent organic light emitting diodes and their electroluminescent properties were evaluated. The experimental devices were divided into two kinds according to the material ($Alq_3$ or SFC137) used as an electron transport layer (ETL). Luminous intensities of the devices using $Alq_3$ and SFC137 as electron transport layers were 27,500 cd/$m^2$ and 51,500 cd/$m^2$ at an applied voltage of 9V, respectively. The current efficiencies of both devices were similar as 12.6 cd/A under a luminance of 10,000 cd/$m^2$, while showed slower decay in the device with SFC137 as an ETL according to the further increase of luminance. Current density and luminance of the device with SFC137 as an electron transport layer were higher at the same voltage than those of the device with $Alq_3$ as an ETL.
TMP-BiP 호스트와 DJNBD-1 도펀트를 이용한 청색 OLED의 제작과 특성평가
장지근,안종명,신상배,장호정,공수철,신현관,공명선,이칠원,Chang, Ji-Geun,Ahn, Jong-Myoung,Shin, Sang-Baie,Chang, Ho-Jung,Gong, Su-Choel,Shin, Hyun-Kwan,Gong, Myung-Sun,Lee, Chil-Won 한국반도체디스플레이기술학회 2007 반도체디스플레이기술학회지 Vol.6 No.2
The blue emitting OLEDs using TMP-BiP[(4'-Benzoylferphenyl-4-yl)phenyl-methanone-Diethyl(biphenyl-4-ymethyl) phosphonate] host and DJNBD-1 dopant have been fabricated and characterized. In the device fabrication, 2-TNATA [4,4',4"-tris(2-naphthylphenyl-phenylamino)-triphenylamine] as a hole injection material and NPB [N,N'-bis(1-naphthyl)N,N'-diphenyl-1,1'-biphenyl-4,4'-diamine] as a hole transport material were deposited on the ITO(indium tin oxide)/glass substrate by vacuum thermal evaporation method. Followed by the deposition, blue color emission layer was deposited using TMP-BiP as a host material and DJNBD-1 as a dopant. Finally, small molecule OLEDs with structure of $ITO/2-TNATA/NPB/TMP-BiP:DJNBD-l/Alq_3/LiF/Al$ were obtained by in-situ deposition of $Alq_3$, LiF and Al as the electron transport material, electron injection material and cathode, respectively. The effect of dopant into host material of the blue OLEDs was studied. The blue OLEDs with DJNBD-1 dopant showed that the maximum current and luminance were found to be about 34 mA and $8110\;cd/m^2$ at 11 V, respectively. In addition, the color coordinate was x=0.17, y=0.17 in CIE color chart, and the peak emission wavelength was 440 nm. The maximum current efficiency of 2.15 cd/A at 7 V was obtained in this experiment.