• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2001년도 하계학술대회 논문집
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• pp.358-360
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• 2001

In this study, the bis(8-oxyquinolino)zinc II (Znq$_2$) were synthesized successfully from zinc chloride (ZnC1$_2$) as a initial material. Then, we fabricated red organic electroluminescent device with a dye (DCJTB)-doped and inserted Znq$_2$ between emission layer and cathode layer for increasing EL efficiency. The hole transfer layer is a N,N'-diphenyl-N,N'-bis-(3-methyl phenyl) -1,1'-diphenyl-4,4'- diamine(TPD), and the host material of emission layer is Znq$_2$. And we study the electrical and optical properties of devices. We found that the device using Znq$_2$ inserting layer result in the increased efficiency.

• 한국전기전자재료학회논문지
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• 제15권2호
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• pp.110-118
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• 2002

Organic thin film transitors(OTFT) are of interest for use in broad area electronic applications. And recently organic electroluminescent devices(OELD) have been intensively investigated for using in full-color flat-panel display. We have fabricated inverted-staggered structure OTFTs at lower temperature using the fused-ring polycyclic aromatic hydrocarbon pentacene as the active eletronic material and photoacryl as the organic gate insulator. The field effect mobility is 0.039∼0.17 ㎠/Vs, on-off current ratio is 10$\^$6/, and threshold voltage is -7V. And here we report the study of driving emitting, Ir(ppy)$_3$, phosphorescent OELD with all organic thin film transistor and investigated its electrical characteristics. The OELD with a structure of ITO/TPD/8% Ir(ooy)$_3$ doped in BCP/BCP/Alq$_3$/Li:Al/Al and OTFT with a structure of inverted-stagged Al(gate electrode)/photoacry(gate insulator)/pentacene(p-type organic semiconductor)/ Au(source-drain electrode) were fabricated on the ITP patterned glass substrate. The electrical characteristics are turn-on voltage of -10V, and maximum luminance of about 90 cd/㎡. Device characteristics were quite different with that of only OELD.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 추계학술대회 논문집 전기물성,응용부문
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• pp.109-111
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• 2001

In this study, The cathode interface layer (CIL) was investigated using aromatic diamine derivatives. Cz-TPD (4,4'-biscarbazolyl (9)-biphenyl) used in the cathode interface layers is investigated emition charcaracteristics at the green organic electroluminescent devices TPD (N.N'-dyphenyl-N-N'-bis(3-methy phenyl)-1.1'-biphenyl-4.4'-diamine) as the hole transformer layer and $Alq_3$:tris (8-hydroxyquinoline) aluminium) as the electron transport layer and emiting layer maded use of the organic electroluminescent device. The Organic Electroluminescent Device with Ag, cathode and CIL of Cz-TPD(4,4'-biscarbazolyl(9)-biphenyl) showed good EL characteristics compare to a conventional Mg:Ag device and also an improved storage stability.[1] As the change in MgAg, Cz-TPD/Ag, Ag at the chthode, the electron and optical charcaracteriseics were investigated.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2002년도 춘계학술대회 논문집 디스플레이 광소자 분야
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• pp.124-127
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• 2002

In this study, The cathode interface layer (CIL) was investigated using aromatic diamine derivatives. Cz-TPD (4,4'-biscarbazolyl(9)-biphenyl) used in the cathode interface layers is investigated emition charcaracteristics at the green organic electroluminescent devices. TPD (N,N' -dyphenyl -N -N'-bis (3-methy phenyl)-1,1' -biphenyl-4,4' -diamine) as the hole transformer layer and $Alq_{3}:tris$ (8-hyd-roxyquinoline) aluminium) as the electron transport layer and emiting layer maded use of the organic electroluminescent device. The Organic Electroluminescent Device with Ag cathode and CIL of Cz-TPD(4,4'-biscarbazolyl(9)-biphenyl) showed good EL characteristics compare to a conventional Mg:Ag device and also an improved storage stability. [1] As the change in MgAg, Cz-TPD/Ag, Ag at the chthode, the electrical and optical charcaracteriseics were investigated.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2000년도 제1회 학술대회 논문집
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• pp.205-206
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• 2000

The capacitance-temperature (C-T) measurement technique is proposed in the present work to investigate the thermal stability of organic and polymeric thin films for organic electroluminescent display (OELD). The single layer devices with the individual materials were subjected to the C-T measurement, prior to the examination of the complete OELD. The single layer devices with the small molecules destroyed below $180\;^{\circ}C$ depending on the kinds of materials. However, the device with the hole-transporting polyimide did not show any relaxation up to $200\;^{\circ}C$. The small molecule based OELDs failed to emit light after annealing, whereas that with the hole-transporting polyimide worked well in spite of large reduction in intensity.

• Transactions on Electrical and Electronic Materials
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• 제3권2호
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• pp.16-19
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• 2002

In this study, a novel red emitting organic electroluminescent (EL) device was fabricated with the bis(8-oxyquinolino)zinc II (Znq2) doped dye as an emitting layer. The Znq2 was synthesized successfully from zinc chloride (ZnC1$_2$) as an initial material. Then, we fabricated the red organic EL device with a dye (DCJTB) doped and inserted Znq2 between emission layer and cathode for increasing EL efficiency. The hole transporting layer is a N,N'-diphenyl-N,N'-bis-(3-methylphenyl)-1,1'-diphenyl-4,4-diamine (TPD), and the host material of emission layer is Znq2. And the electrical and luminance characteristics of the device were measured. We found that the EL device with Znq2 inserting layer results in the increasing luminance efficiency.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1999년도 춘계학술대회 논문집
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• pp.96-98
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• 1999

유기전계발광소자(OELD)의 성능 향상을 위한 많은 연구가 진행되고 있지만 아직까지 금속전극과 유기발 광층 사이의 접촉저항(Contact Resistance)에 관한 연구는 거의 보고되지 않고 있다. Ohmic 접합에서 접촉 저항은 효율적이고 신뢰성 있는 소자제작에 있어서 간과되어서는 안될 매우 중요한 부분이다. 본 연구에서는 금속전극과 유기발광충 사이의 접촉저항에 관해서 논의하고자 한다. 본 연구에서 제작된 샘플은 금속전극으로 Ag, 유기발광재료로서 Alq$_3$를 사용하였으며, Alq3의 두께를 100 $\AA$에서 500 $\AA$까지 각각 다르게 하여 서로 다른 두께의 유기발광층을 가지는 샘플을 제작하였다. 금속전극의 매트릭스 구조에 의해 형성된 적선의 크기는 3 mm x 2 mm이며, 제작된 샘플의 접촉비저항은 TLM(Transmission Line Measurement) 방법을 이용하여 구하였다. Planar한 TLM model로부터 새로운 vertical model을 유추하였으며, 이를 근거로 접촉저항 및 transfer length 등을 계산하였다. 상온에서 측정된 전체 저항값은 유기발광층의 두께가 증가함 에 따라 증가하는 경향을 나타냈으며, 이 때 계산된 접촉비저항은 1.49$\times$$10^1$ $\Omega$-$\textrm{cm}^2$ 이다. 접촉저항은 전극 사이의 거리의 증가에 따라 증가하지만, 측정시간의 thermal budget의 영향으로 상대적으로 전체저항이 감 소하였으나, 저항감소분의 포화에 따라서, 거리에 비례하여 다시 저항이 증가하였다.

• 마이크로전자및패키징학회지
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• 제9권1호
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• pp.9-13
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• 2002

최근, 효율적인 다층박막 구조로된 풀칼라 유기 전계발광소자 (organic electroluminescient device, OELD)의 시제품이 개발된바 있다. 본 연구에서는 ITO (indium tin oxide)/glass 투명기판위에 다층구조의 OELD 소자를 진공 열증착법으로 제작하였다. 사용된 저분자 유기화합물은 전자수송 및 주입층으로 $Alq_3$(trim-(8-hydroxyquinoline)aluminum)와 CTM (carrier transfer material) 물질을 사용하였고, 정공수송 덴 주입층으로는 TPD (triphenyl-diamine)와 CuPc (copper phthalocyanine)를 각각 증착하였다. 발광휘도는 임계전압 10 V 이상에서 급격히 증가하였으며, $A1/CTM/Alq_3$/TPD/1TO 구조로된 OELDs 소자의 경우- l7 V전압에서 430 cd/$m^2$의 휘도특성과 파장 512 nm의 녹색 발광을 나타내었다. 한편 $Li-A1/Alq_3$/TPD/CuPC/1TO 다층구조로된 소자의 발광파장은 508 nm 이며, 발광휘도는 17 V에서 650 cd/$m^2$의 값을 얻을 수 있었다. Li-Al 전극을 갖는 다층구조에서 발광휘도의 증가는 정공주입층인 CuPc의 적층으로 발광층에서 재결합 효율이 개선되었기 때문이며, 또한 Li-Al 전극의 경우 Al전극에 비해 낮은 일함수(work function)를 갖기 때문으로 판단된다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 C
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• pp.1466-1468
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• 2001

For the full color organic electro-luminescent device, essentially, red, green, and blue emissions are required. But red emission is not to reach minimum level of practical use 31[lm/W]. In order to optimize color purity and power consumption requirements, it is important for the materials development efforts to search for improvements in red emission effisiency. In this study, the bis(8-oxyquinolino)zinc II ($Znq_2$) were synthesized successfully from zinc chloride($ZnCl_2$) as a initial material. Then, we fabricated red organic electroluminescent device with a dye(DCJTB)-doped and inserted $Znq_2$ between emission layer and cathode layer for increasing EL efficiency. The hole transfer layer is a N,N'-diphenyl-N,N'-bis-(3-methyl phenyl) -1,1'-diphenyl-4.4'-diamine(TPD), and the host material of emission layer is $Znq_2$. For the inserting of $Znq_2$, efficiency increased.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2000년도 추계학술대회 논문집
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• pp.170-173
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• 2000

In this study, we have investigated the light-emitting property of the EL device with the thickness ratio of the HTL/ETL, which was 500$\AA$:500$\AA$, 400$\AA$:600$\AA$, 600$\AA$:400$\AA$. The ALq$_3$ was used for the ETL. We have studied the relation of voltage, contrase, efficiency for current density. Emission was observed above 10mA/$\textrm{cm}^2$ and luminance was measured to be 1030cd/$m^2$ at a current density of 100mA/$\textrm{cm}^2$ in 500$\AA$/500$\AA$ sample. A luminance of over 2500cd/$m^2$ was also observed after the final fabrication process in 500$\AA$/500$\AA$ sample