• Title, Summary, Keyword: Organic light-emitting diode

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Reliability Assessment Criteria of Organic Light Emitting Diode(OLED) (유기 발광 다이오드의 신뢰성 평가기준)

  • Hong, Won-Sik;Song, Byeong-Suk;Jeong, Hai-Sung;Lim, Jae-Hak
    • Journal of Applied Reliability
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    • v.9 no.2
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    • pp.131-148
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    • 2009
  • An organic light emitting diode (OLED), also light emitting polymer (LEP) and organic electro luminescence (OEL), is any light emitting diode (LED) whose emissive electroluminescent layer is composed of a film of organic compounds. The layer usually contains a polymer substance that allows suitable organic compounds to be deposited. They are deposited in rows and columns onto a flat carrier by a simple "printing" process. The resulting matrix of pixels can emit light of different colors. Such systems can be used in television screens, computer displays, small, portable system screens such as cell phones and PDAs, advertising, information and indication. OLEDs can also be used in light sources for general space illumination, and large-area light-emitting elements. In this paper, we develop the general guide line of the accelerated life test for assuring B10 life of AMOLED(Active Matrix Organic Light Emitting Diode) and PMOLED(Passive Matrix Organic Light Emitting Diode) which are widely used for display monitor less than 115 mm.

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Electrical Conduction Mechanism and Equivalent Circuit Analysis in $Alq_3$ based Organic Light Emitting Diode ($Alq_3$에 기초한 유기 발광 소자에서 전기전도특성과 등가회로분석)

  • Chung, Dong-Hoe;Shin, Cheol-Gi;Lee, Dong-Gyu;Lee, Joon-Ung;Lee, Suk-Jae;Lee, Won-Jae;Jang, Kyung-Wook;Kim, Tae-Wan
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.103-106
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    • 2004
  • We have studied a conduction mechanism and equivalent circuit analysis in $Alq_3$ based Organic Light Emitting Diode. The conduction mechanism in organic light emitting diode can be classified into three regions; ohmic region, space-charge-limited current (SCLC) region and trap-charge-limited current (TCLC) region depending on the region of applied voltage. Equivalent circuit model of organic light emitting diode can be established using a parallel combination of resistance $R_p$ and capacitance $C_p$ with a small series resistance $R_s$.

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Study on 3-dimension Image Process based on Organic light Emitting Diode (유기발광소자 (Organic Light Emitting Diode)를 이용한 3차원 영상에 대한 연구)

  • Lee, Jung-Ho
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.497-499
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    • 2005
  • A portable terminal assistant market grows rapidly every year and it requires many change in research on display devices. Among many newly developing methods, OLED(Organic Light Emitting Diode) is considered an advanced flat display device because its excellent characteristics, including high speed response, full color performance, low power consumption and flux of panel. However changes in the market of display shows that the market will require 3-dimensional images, but it is hard for existing 2-dimensional displays to make 3-dimensional images. Therefore we will try to find various methods such as holograms. In this paper, we will show existing flat displays can make 3-dimensional images by applying Lenticular Screen printing techniques on the organic semiconductor display device.

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High Efficiency and Long Lifetime for Organic Light-Emitting Diode Using a New Electron Transport Material

  • Miyashita, Yuichi;Mochizuki, Osamu;Tanaka, Tsuyoshi;Aihara, Hidenori
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.428-430
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    • 2008
  • We demonstrated high power efficiency and long lifetime for organic light-emitting diode (OLED) using a new electron transport material (ETM-1). A power efficiency of the device with ETM-1 was improved compared to a standard device using tris(8-hydroxy-quinolinate)aluminum ($Alq_3$). Moreover, the lifetime was 4 times longer than the standard device.

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High Efficiency and Long Lifetime for Organic Light-Emitting Diode Using New Electron Transport Materials

  • Tanaka, Tsuyoshi;Sato, Masaru;Aihara, Hidenori;Yanai, Naoko;Yamakawa, Tetsu
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.625-627
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    • 2007
  • We demonstrated high power efficiency and long lifetime in organic light-emitting diode (OLED) using new electron transport materials (ETMs). Electroluminescent device with these ETMs showed lower driving voltage than that with $Alq_3$. The device lifetime with a new ETM was 2 times longer than that with $Alq_3$.

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Enhancement of outcoupling efficiency of OLEDs by using nanoimprinted polymer nanostructures

  • Jeon, So-Hee;Kang, Jae-Wook;Park, Hyung-Dol;Shim, Jong-Youp;Jeong, Jun-Ho;Kim, Se-Heon;Youn, Jae-R.;Kim, Jang-Joo
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.521-522
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    • 2008
  • An etch-less simple method was developed to fabricate two-dimensional nanostructures on glass substrate directly by using UV curable polymer resin and UV nanoimprint lithography in order to improve output coupling efficiency of OLEDs. OLEDs integrated on nanoimprinted substrates enhanced electro-luminance intensity by up to 50% compared with the conventional device.

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Fabrication of a White Organic Light Emitting Diode By Synthesizing a Novel Non-conjugated Blue Emitting Material PPPMA-co-DTPM Copolymer (신규 비공액성 청색발광재료 PPPMA-co-DTPM 공중합체 합성을 통한 백색유기발광소자 제작)

  • Cho, Jae-Young;Oh, Hwan-Sool;Kim, Tae-Gu;Yoon, Seok-Beom
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.18 no.7
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    • pp.641-646
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    • 2005
  • To fabricate a single layer white organic light emitting diode (OLED), a novel non-conjugated blue emitting material PPPMA-co-DTPM copolymer was synthesized containing a perylene moiety unit with hole transporting and blue emitting ability and a triazine moiety unit with electron transporting ability. The devices were fabricated using PPPMA-co-DTPM $(PPPMA[70\;wt\%]:DTPM[30\;wt\%])$ copolymer by varying the doping concentrations of each red, green and blue fluorescent dye, by molecular-dispersing into Toluene solvent with spin coating method. In case of ITO/PPPMA-co-DTPM:TPB$(3\;mol\%):C6(0.04\;mol\%):NR(0.015\;mol\%)/Al$ structure, as they were molecular-dispersing into 30 mg/ml Toluene solvent, nearly-pure white light was obtained both (0.325, 0.339) in the CIE coordinates at 18 V and (0.335, 0.345) at 15 V. The turn-on voltage was 3 V, the light-emitting turn-on voltage was 4 V, and the maximum external quantum efficiency was $0.667\%$ at 24.5 V. Also, in case of using 40 mg/ml Toluene solvent, the CIE coordinate was (0.345, 0.342) at 20 V.

A Highly Efficient Organic Light-Emitting Diode with an Imprinted In-Cell Polarizer for Backlight Applications

  • Lee, Won-Suk;Choi, Won-Suk;Lim, Yong-Woon;Na, Yu-Jin;Lee, Sin-Doo
    • Journal of Information Display
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    • v.9 no.4
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    • pp.11-14
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    • 2008
  • A highly efficient organic light-emitting diode (OLED) with an in-cell polarizer made of an imprinted liquid crystalline polymer (LCP) layer doped with dichroic dye molecules is presented. The in-cell polarizer was found to be capable of effectively polarizing the emission light of the OLED and of significantly improving the luminance through the periodic microstructures fabricated using an imprinting method. This type of OLED with an imprinted in-cell polarizer is useful for efficient light source applications in liquid crystal displays (LCDs).

Characteristics and fabrications of high brightness organic light emitting diode(OLED) (고휘도 유기발광소자 제작 및 특성)

  • Jang, Yoon-Kee;Lee, Jun-Ho;Nam, Hyo-Duk;Park, Chin-Ho
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.316-319
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    • 2001
  • Organic light emitting diodes(OLEDs) with a hole injection layer inserted between Indium-Tin-Oxide(ITO) anode and hole transport layer were fabricated. The effect of plasma treatment on the surface properties of Indium-Tin-Oxide(ITO) anode were studied. The electrical and optical characteristics of the fabricated organic light emitting diodes(OLEDs) were also studied. The diode including of plasma treated ITO substrate and the hole injection layer, which showed the luminance of 5280 $cd/m^{2}$ at 8 V

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