• Journal of the Korean Electrochemical Society
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• v.3 no.1
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• pp.1-4
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• 2000

The Bis(8-oxyquinolino) zinc lII (Znq2) were synthesized successfully from zinc chloride $(ZnCl_2)$ as a initial material . The organic electroluminescece devices (ELDs) were fabricated with N-N'-diphenyl-N-N'-bis (3-meth-ylphenyl)-1,1'-biphenyl-4,4'-diamine (TPD) which act as a hole transporting layer and the Znq2 act as an EL emitting layer and electron transporting layer. In order to maximize luminance of ELD, TPD/Znq2/Al were deposited onto cleaned indium tin oxide (ITO) by changing thickness of EL emitting layer. The photoluminescence (PL) results show that Znq2 compound emits yellow green from 540nm. electrochemical behavior with V-J and V-L curve of carrier injection was investigated from 6 V. respectively. The maximum luminance were defected about $838 cd/m^2$. From these results, ai synthesized Znq2 material maybe one of the useful material of organic EL display material.

• Proceedings of the Korea Contents Association Conference
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• 2008.05a
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• pp.301-305
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• 2008

An organic light-emitting diode(OLED) has advantages of low power driving, self light-emitting, wide viewing angle, excellent high resolution, full color, high reproduction, fast response speed, simple manufacturing process, or the like. However, there are still a number of challenges to get over in order to put it to practical use as a high performance display. First of all, the most important thing is to improve the efficiency of the OLED element in order to commercialize it. To this end, its efficiency can be improved by lowering the driving voltage through the improvement of structure of the OLED element and the application of new organic substance. Therefore, in this study, we have manufactured a red OLED element by applying fluorescent dyes to the emitting layer of the element having the structure of ITO/TPD/Znq2+DCJTB/Znq2/Al and the structure of ITO/CuPc/NPB/Alq3+DCJTB/Alq3/Al, in order to light-emitting various colors or improve the brightness and the efficiency, and then we have evaluated its electrical and optical characteristics.

• Korean Journal of Optics and Photonics
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• v.26 no.3
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• pp.139-146
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• 2015

The effects of a dielectric multilayer mirror on the efficiency of organic light-emitting diodes (OLEDs) were investigated by using optical simulation. Adoption of a dielectric mirror consisting of alternating SiN and $SiO_2$ layers narrowed the emission spectrum due to the microcavity effect, and increased the outcoupling efficiency by a few percent. The layer thicknesses of the dielectric mirror were adjusted to change the wavelength of the resonance mode, which may be used to increase the color purity.

• Polymer(Korea)
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• v.30 no.3
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• pp.253-258
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• 2006

We have fabricated vortical type organic thin film transistors (OTFTs) consisting of ITO/n type active material/Al gate/n type active material/Al using F16CuPc, NTCDA, PTCDA and PTCDI C-8. The effect of mobility of n type active materials and thin film thickness on current-voltage (I-V) characteristics and on/off ratios were investigated. The vortical type organic transistor using PTCDI C-8 exhibited low operation voltage and high on-off ratio. In addition, we have investigated the feasibility of application in organic light emitting transistor using light emitting polymer. Especially, the light emitting transistor consisting of ITO/PEDOT-PSS/P3HT/F16CuPc/Al gate/F16CuPc/Al showed the maximum quantum efficiency of 0.054.

• Journal of the Korean Applied Science and Technology
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• v.29 no.3
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• pp.459-465
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• 2012

We had synthesized a green dopant material based on the binaphthyl group, 7,7'-(2,2'dimethoxy-1,1'-binaphthyl-3,3'-diyl) bis(4-(thiophen -2-yl) benzo[e][1,2,5] thiadiazole (TBT). We also fabricated the white organic light emitting diode (OLED) with a phosphorescent blue emitter : iridium(III)bis[(4,6-di-fluoropheny)-pyridinato -N,C2]picolinate (FIrpic) doped in N,N'-dicarbazolyl-3,5-benzene (mCP) of hole transport type host material and both TBT and bis(2-phenylquinolinato)- acetylacetonate iridium(III) (Ir(pq)2acac) doped in 1,3,5-tris(N-phenylbenzimidazole -2-yl)benzene (TPBi) of electron transport type host material. As a result, the property of white OLED using TBT, which demonstrated a maximum luminous efficiency and external quantum efficiency of 5.94 cd/A and 3.23 %, respectively. It also showed the pure white emission with Commission Internationale de I'Eclairage (CIE) coordinates of (0.34, 0.36) at 1000 nit.

• Journal of Korean Ophthalmic Optics Society
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• v.10 no.4
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• pp.267-272
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• 2005

We deposited thin films of organic light-emitting-material $Alq_3$(alumina quinoline) on silicon and slide-glass substrates using thermal evaporation method, and measured spectra of ellipsometry angles ${\Delta}$ and ${\Psi}$ in the photon-energy range of 1.5~5.0 eV using a variable angle spectroscopic ellipsometer. The optical constants, refractive index and extinction coefficient, of $Alq_3$ were determined via the dispersion parameters extracted from the curve-fitting process based on Jellison-Modine dispersion function. The reliability of determined optical constants were verified through the comparison of measured and simulated transmittance curves and the good agreement between simulated absorption-coefficient curves and absorbance spectra measured using a spectrophotometer.

• Proceedings of the KIEE Conference
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• 2006.10b
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• pp.171-174
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• 2006

본 연구에서 새로 합성한 적색 도판트 Red-1을 Physical vapor Deposition (PVD) 법을 이용하여 다층구조의 유기 발광 다이오드를 제작하였다. 적층된 유기물 층으로 정공주입층은 4,4',4"-tri [2-naphthyl(phenyl)amino]triphenylamine(2-TNATA) 정공 수송층으로4-4bis [N-(1-napthyl-N-phenyl-amino)biphenyl] (NPB)를 사용하였으며 전자 수송층은 tris (8-quinolinolato)-aluminum ($Alq_3$), 발광층에서의 host 재료로 사용한 물질은 $Alq_3$. 4,4'- N-N'-dicarba zole-biphenyl (CBP), 게스트재료는 Red-1, 정공저지층으로 2,9-dimethyl-4, 7-diphenyl -1 10-phen antroline (BCP), 전자 주입층으로는 lithiumquinolate (Liq)를 사용하여 보다 향상된 전기적, 발광특성을 보이는 소자를 제작하였다. 전하를 주입하는 전극으로 일함수가 큰 투명전극인 ITO (indium-tin-oxide)를 양전극으로, Al을 음전극으로 사용하였다. 그리하여, 발광층 내에서의 host재료 $Alq_3$와 CBP와의 energy transfer의 관점에서 그 특성을 연구하였다.

• Proceedings of the Korean Society Of Semiconductor Equipment Technology
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• 2005.05a
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• pp.224-228
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• 2005

차세대 디스플레이로서 각광을 받고 있는 OLED는 현재 많은 기업과 대학 연구소에서 연구가 활발히 진행중이다. 현재 12인치 이하에서 양산이 되고 있는 저분자 OLED에 비해 고분자 OLED는 공정이 간단하고 대화면, flexible 디스플레이가 가능하다는 많은 장점을 가지고 있지만 소자의 신뢰성과 안정성에 문제를 갖고 있다. 본 논문에서는 ITO/PEDOT:PSS/MEH-PPV/Al 구조를 갖는 유기발광다이오드를 제작하여 전기 광학적 특성을 조사하였다. 제작된 소자의 구조를 최적화시키기 위하여 ITO 기판의 열처리 효과와 패턴폭에 따른 면저항을 측정하고, 발광효율을 극대화시키기 위하여 다층구조로서 정공수송층인 PEDOT:PSS를 첨가시켜 박막의 표면상태를 향상시켜 ITO기판에서 발광층인 MEH-PPV로의 정공수송을 원활하여 효율을 증대시키려 하였다. 이렇게 형성된 소자에 발광물질인 MEP-PPV의 농도를 0.1, 0.3, 0.5, 0.7, 0.9, $1.5wt\%$로 변화시켜 박막을 형성하고 $3{\times}10^{-6}Torr$ 상태의 고진공에서 Al 전극을 증착시켜 제작된 소자의 전기${\cdot}$광학적 특성을 측정, 비교하였다.

• 전자공학회논문지 IE
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• v.43 no.2
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• pp.1-6
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• 2006

The white organic light emitting diode(OLED) with two-wavelength was fabricated using the DPVBi of blue emitting material and a series of orange colar fluorescent dye(Rubrene) by vaccum evaporation processes. The basic structure of OLED was ITO/TPD$(225{\AA})$/DPVBi/Rubrene/BCP$(210{\AA})/Alq_3(225{\AA})/Al(1000{\AA})$. We analyzed the fabricated device through the changes of the DPVBi and Rubrene layer's thickness. We obtained the white OLED with the CIE coordinate of the device was (0.29, 0.33) and luminescence of $1000cd/m^2$ at applied voltage of 15V when 4he thickness of DPVBi layer was 210${\AA}$ and the thickness of Rubrene layer was 180${\AA}$.

• Proceedings of the KIEE Conference
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• 2000.07c
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• pp.1705-1707
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• 2000

유기 전기발광 디스플레이 (Electroluminescence Display; ELD)는 저전압 구동, 자기발광, 경량박형, 광시야각, 빠른 응답속도 등의 장점으로 차세대 디스플레이의 후보로서 주목받고 있다. Eu complex는 610 nm 부근에서 예리한 스펙트럼의 대역폭을 가지며 붉은색의 강한 형광을 나타내는 유기화합물로 잘 알려져, 있다. 새로이 합성한 란탄계 금속착물인 $Eu(TTA)_{3}TPPO$를 발광층으로 사용하여 적색 발광의 효율을 높이기 위해 소자를 제작하였고, 이 때 구동 전압은 9 V이고 18 V에서 가장 밝은 38cd/$m^2$의 휘도를 나타내었으며 전류밀도는 20mA/$cm^2$ 이었다. 제작된 소자의 EL 스펙트럼은 615 nm로 PL 스펙트럼과 동일하게 예리한 최대 피크를 나타내었고, 순환 전압전류법을 이용하여 각 유기 물질들의 에너지 준위를 알 수 있었으며, 각각의 소자들의 에너지 밴드 다이어그램을 통하여 전기적 특성을 분석하였다.