• Title/Summary/Keyword: Organic EL

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Electroluminescent Characteristics of Organic Thin Film (유기박막의 Electroluminescent(EL) 특성)

  • Moon, Jong-Dae
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.1
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    • pp.88-91
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    • 2008
  • Electroluminescent(EL) devices based on organic thin films are considered to be one of the next generation of flat-panel displays. In this paper, we have investigated electro-luminescent(EL) characteristics of organic EL device using $Alq_3$, PBD as emitting material. Current and luminance can be seen that express a similar relativity in voltage and could know that luminance is expressing current relativity.

Electroluminescent Characteristics of Organic Thin Films (유기 박막의 EL특성)

  • Song, Jin-Won;Choi, Yong-Sung;Lee, Kyung-Sup
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.20 no.2
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    • pp.178-182
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    • 2007
  • Electroluminescent (EL) devices based on organic thin films are considered to be one of the next generation of flat-panel displays. In this paper, we have investigated electro-luminescent (EL) characteristics of organic EL device using $Alq_{3}$, PBD as emitting material. Current and luminance can be seen that express a similar relativity in voltage and could know that luminance is expressing current relativity.

Present Status and Future Prospective of Organic EL

  • Tsutsui, Tetsuo
    • Proceedings of the Materials Research Society of Korea Conference
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    • 2000.05a
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    • pp.53-76
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    • 2000
  • Multi-color organic electroluminescent (EL) displays have already been commercialized, and the simple extensions of present technologies on organic EL can not be a target for basic research anymore. Future prospect of research on organic electroluminescent devices are described from the view point of possible future break-through. Three aspects, perspective for further increase of device efficiencies, possibility of simplified device structures and possible use of thick organic layers, are discussed.

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A Development of Distributed Parallel Processing algorithm for Power Flow analysis (유기EL과 무기EL에 관한 연구)

  • Lee, Han-Sung
    • Proceedings of the KIEE Conference
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    • 2001.07e
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    • pp.67-71
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    • 2001
  • Nowdays, we can communicate using Information Technology such as internet, personal computer, mobile phone etc. To protect global environment, it is also reqired to invent products efficiently reduce energy consumption. here, I studied organic EL and inorganic EL because organic EL display is appropriate device as light, thin, energy-saying display following CRT, LCD. As a result, I realized that we are supposed to study more on invention, efficiency and mass-production of materials. Comparing with another display, however, it would be marketable in few years, considering short history of its full-scaled studies.

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White Organic Light-emitting Diodes using the Tandem Structure Incorporating with Organic p/n Junction

  • Lee, Hyun-Koo;Kwon, Do-Sung;Lee, Chang-Hee
    • Journal of Information Display
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    • v.8 no.2
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    • pp.20-24
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    • 2007
  • Efficient white organic light-emitting diodes are fabricated with the blue and red electroluminescent (EL) units electrically connected in a stacked tandem structure by using a transparent doped organic p/n junction. The blue and red EL units consist of the light-emitting layer of 1,4-bis(2,2-diphenyl vinyl)benzene (DPVBi) and 4-dicyanomethylene-2-methyl-6-[2-(2,3,6,7-tetrahydro-1H,5H-benzo[i,j] quinolizin-8-yl)vinyl]-4H-pyran) (DCM2) doped tris(8-hydroxyquinoline) aluminum $(Alq_3)$, respectively. The organic p-n junction consists of ${\alpha}-NPD$ doped with $FeCl_3$ (15 % by weight ratio) and $Alq_3$ doped with Li (10 %). The EL spectra exhibit two peaks at 448 and 606 nm, resulting in white light-emission with the Commission Internationale d'Eclairage (CIE) chromaticity coordinates of (0.36, 0.24). The tandem device shows the quantum efficiency of about 2.2 % at a luminance of 100 $cd/m^2$, higher than individual blue and red EL devices.

EL Properties of the Organic Light-Emitting-Diode with various Thickness and Cathode Electrode (유기발광소자의 막두께 및 음극전극의 변호에 따른 발광특성)

  • 김형권;이덕출
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.11 no.10
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    • pp.897-902
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    • 1998
  • We prepared Organic LED with a two layer structure by vacuum evaporation. The diode consisted of hole transfer layer (thickness of 30, 50, 70 nm) and electron transfer layer (thickness of 70, 50, 30 nm) material, which was N, N'-diphenyl- N, N'-bis-(3-methyl phenyl)-1,1'-diphenyl-4,4'-diamine)(TPD) and tris(8-hydroxy quinoline) aluminum(Alq3), respectively. We investigated EL properties of the LED with various thickness and cathode electrode. The best results were obtained when thickness of the electron layer is equal to that of emission layer and when AlLi alloy was used as a cathode. The EL intensity, luminance and efficiency of organic LED with equal of layer thick were improved seven, three and two times, respectively. Alq3 was ionized by carrier injection from cathode and could produce exitons. After electron-hole pairs were formed by combination of the electrons and holes at the emission layer, Alq3 layer emitted light.

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Emission Characteristics of Multilayer Structure OLED (다층구조 OLED소자의 발광특성)

  • Chol, Young-Il;Cho, Su-Young
    • 전자공학회논문지 IE
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    • v.48 no.4
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    • pp.25-29
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    • 2011
  • Organic electroluminesencent device have been studied because of its easy fabrication and high brightness for plate panel display instead of CRT and LED. There are some device structure for full color filter system can be applicable to the full color application if the blue light organic electroluminesencent device(OELD) is developed. In this study, We have investigated electro-luminescent (EL) characteristics of organic EL device using Alq3, PBD as emitting material. Current and luminance can be seen that express a similar relativity in voltage and could know that luminance is expressing current relativity.

( Syntheses of Improved Polymer/Organic Materials for Electroluminescence(EL) Device and Electro-Optical Characteristics I. Properties of Dye Doped Organic EL Device (고기능 EL소자용 고분자/유기 재료의 합성 및 전기 광학적 특성 I. 색소 도핑에 의한 EL소자의 특성)

  • 김성훈
    • Journal of the Korean Graphic Arts Communication Society
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    • v.13 no.2
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    • pp.33-45
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    • 1995
  • 1, 4-Diketo-3, 6-diphenyl-pyrrolo-[3, 4c]-pyrrole(abbriviated DPP) is a new heterocyclic pigment of red color whose chlorinated derivative is now on the market. DDP was synthesized from benzonitrile and diethylsuccinate. Pariser-parr-pople(PPP) molecular orbital calculations have been carried out on the DPP in other to study spectroscopically the DPP chromophore on deprotonation.

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Top Emission Organic EL Devices Having Metal-Doped Cathode Interface Layer

  • Kido, Junji
    • 한국정보디스플레이학회:학술대회논문집
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    • 2002.08a
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    • pp.1081-1081
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    • 2002
  • Top emission organic EL devices were fabricated by using metal-doped cathode interface layer to achieve low drive voltages. Also, facing-targets-type sputtering was used to sputter indium-tin oxide layer on top of organic active layer. The devices fabricated in this study showed reasonably high external quantum efficiency of about 1 % which is comparable to that of bottom-emission-type devices.

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The Fabrication and an Analysis on the characteristics of Red OLED by various Organic Dyes (유기물 색소에 따른 적색 유기 발광 소자의 제작 및 특성 분석)

  • 최상건;이무상;노병규;오환술
    • Proceedings of the IEEK Conference
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    • 2000.11b
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    • pp.265-268
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    • 2000
  • Organic electroluminescent(EL) devices have been expected to be useful in novel-type flat-panel displays. This paper has fabricated and analyzed a red organic EL device with the use of organic dyes, such as DCMI and Nile Red. In this paper, the light emitting layer consists of tris-(8-hydroxyquiniline) aluminum(Alq$_3$) doped with organic dyes.

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