• Title/Summary/Keyword: Organic electroluminescent

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Dual - Drive & - Emission Panel

  • Miyashita, Takuya;Naka, Shigeki;Okada, Hiroyuki;Onnagawa, Hiroyoshi
    • 한국정보디스플레이학회:학술대회논문집
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    • 2004.08a
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    • pp.707-710
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    • 2004
  • We have proposed on dual-drive & -emission (DDE) panel based on organic light-emitting diodes (OLEDs). The device is composed on independent operation of two OLED structures with two transparent electrodes for data signals and an intermediate reflective electrode for common scan signal. Typical device structure is ITO / organic electroluminescent layer (1) /intermediate reflective electrode / organic electroluminescent layer (2) /transparent electrode. Symmetric bright emission could be obtained by applying AlNd as the intermediate reflective electrode and $MoO_3$ as a hole injection layer for upper device structure. The proposed panel is useful for emissive face-to-face panel exhibited for different images.

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Electroluminescence Properties from Blend films of poly(3-hexylthiophene) and poly(N-vinylcarvazole) (P3HT와 PVK 블렌드 막에서의 전계 발광 특성)

  • Kim, Dae-Jung;Kim, Shang-Gi;Gu, Hal-Bon;Jung, Un-Jo;Park, Ge-Chun
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.07b
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    • pp.972-975
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    • 2002
  • Electroluminescence(EL) devices based on organic thin layers have attracted lot of interests because of their application as display. One of the problems is red material. It offered a short life and poor emission efficiency to boot. In this study, this problem can be solved by using a multi-layer device structure. Organic electroluminescent devices which are composed of organic thin multi-layer films are fabricated. The basic structure is ITO / Emitting layer / LiP / Al EL device in which Hole transport/Electron blocking PVK layer was blending. We demonstrate the enhancement of eletroluminescence (EL) from blends of poly(3-hexylthiophene) in poly(N-vinylcarvazole). The emitting layer is consisted of a host material(PVK) and a guest emitting material(P3HT). It was showed higher EL intensity and their electro-optical properties were investigated.

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Improvement In recombination at a two-emission-layers interface For White-light-emitting organic electroluminescent device

  • Song, Tae-Joon;Ko, Myung-Soo;Lee, Gyu-Chul;Cho, Sung-Min
    • 한국정보디스플레이학회:학술대회논문집
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    • 2003.07a
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    • pp.928-931
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    • 2003
  • In order to realize full color display, two approaches were used. The first method is the patterning of red, green, and blue emitters using a selective deposition. Another approach is based on a white-emitting diode, from which the three primary colors could be obtained by micro-patterned color filters. White-light-emitting organic light emitting devices (OLEDs) are attracting much attention recently due to potential applications such as backlights in liquid crystal displays (LCDs) or other illumination purposes. In order for the white OLEDs to be used as backlights in LCDs, the light emission should be bright and have Commission Internationale d'Eclairage (CIE) chromaticity coordinates of (0.33, 0.33). For obtaining white emission from OLEDs, different colours should be mixed with proper balances even though there are a few different methods for mixing colors. In this study, we will report a white organic electroluminescent device using exciton diffusion length concept.

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A Study on Electrical and Optical Properties of Dye Doped Organic Electroluminescent Devices (색소 Dopant에 의한 청색 발광 소자의 전기적, 광학적 특성 연구)

  • 이무상;최상건;노병규;오환술
    • Proceedings of the IEEK Conference
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    • 2000.11b
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    • pp.269-272
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    • 2000
  • In this paper, we was fabricated and analyzed a blue organic electroluminescent devices with the organic dye, such as 1,1,4,4-Tetraphenyl-1,3-butadi-ene(TPB). The device was made by simultaneously co-depositing two materials. The device structure was composed of the ITO glass, TPD, Alq$_3$doped TPB, and aluminum(A1) electrode. Carrier injection from the two electrodes was significant]y observed and the blue light in EL spectrum, with an emission maximum at 462nm, was triggered at a driving voltage of 11V.

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A study on Electrical and Optical Properties of Organic Electroluminescent Devices using various Substrates (기판 종류에 따른 유기전기발광소자의 전기적.광학적 특성에 관한 연구)

  • Cho, Jae-Young;Kim, Jung-Yeoun;Kim, Jong-Jun;Oh, Hwan-Sool
    • Proceedings of the IEEK Conference
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    • 2000.11b
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    • pp.25-28
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    • 2000
  • In this paper, three types of organic electroluminescent devices(OELD) were fabricated on mechanically flexible plastic substrate by using vacuum deposition method. The devices consist of a hole transporting material such as TPD, a light-emitting material such as Alq$\sub$3/ and an electron transporting material, blocking material such as PBD. Electrical and optical properties of these OELDs were measured. This paper shows that organic small molecules based on OELD can be successfully deposited on a flexible plastic substrate. This points open the potential for low cost mass production of flexib]e displays, including roll to roll processing.

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Emission Properties of White Light Emission Organic Electroluminescent Device using Exciplex Emission (Exciplex를 이용한 백색 유기 전계발광소자의 발광특성)

  • 김주승;김종욱;구할본
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.14 no.9
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    • pp.762-767
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    • 2001
  • We report the white light emission from the multilayer organic electroluminescent(EL) device using exciplex emission. The exciplex at 500nm originated between poly(N-vinylcarvazole)(PVK) and 2,5-bis(5'-tert-butyl-2-benzoxazoly)thiophene(BBOT) and exciplex of 50nm originated from N,N'-diphenyl-N,N'-(3-methyphenyl)-1,1'-biphenyl-4,4'-diamine(TPD) and BBOT were observed. Also, the energy transfer from PVK to BBOT and poly(3-hexylthiophene)(P3HT) in mixed emitting materials was occurred. The electroluminescence(EL) spectra of organic EL device which have a device structure of ITO/CuPc(5nm)/emitting layer(100nm)/BBOT(30nm)/LiF(1.4nm)/Al(200nm) were slightly changed as a function of the applied voltage. The luminance fo 12.3 ${\mu}$W/$\textrm{cm}^2$ was achieved at 20V and EL spectrum measured at 20V corresponds to Commission Internationale de L\`Eclairage(CIE) coordinates of x=0.29 and y=0.353.

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A Study on the Electrical Characteristics of Organic Thin Film Transistor using Photoacryl as Gate Dielectric Layer (Photoacryl을 게이트 절연층으로 사용한 유기 박막트랜지스터의 전기적 특성에 관한 연구)

  • 김윤명;표상우;김준호;신재훈;김영관;김정수
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.15 no.2
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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.

Energy Transfer and Emission Properties of Organic Electroluminescent Device According to Polymer/Dye Mixing Ratio (고분자/저분자 발광재료의 혼합비에 따른 유기 전계발광 소자의 에너지 전달 및 발광특성)

  • Kim, Ju-Seung;Seo, Bu-Wan;Gu, Hal-Bon;Lee, Kyung-Sup;Park, Bok-Kee
    • Proceedings of the KIEE Conference
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    • 1999.11d
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    • pp.997-999
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    • 1999
  • We fabricated white light-emitting organic electroluminescent device which have a mixed single emitting layer containing poly(N-vinylcarbazole)[PVK], tris(8-hydroxyquinoline)aluminum[Alq3] and poly(3-hexylthiophene)[P3HT] and investigated the emission properties of it. We expect to obtain a blue light from PVK, green light from Alq3 and red light from P3HT The fabricated device emits white light over 18V with slight orange light. We think that the energy transfer in a mixed layer occurred from PVK to $Alq_3$ and P3HT resulted in decreasing the blue light intensity from PVK. With mixing of N, N'-diphenyl-N, N'-(3-methylphenyl)-[1,1'-biphenyl]-4, 4'-diamine[TPD], hole transport material, to the emitting layer, the luminance intensity of device was increased 50 times than that of the device which not contain TPD. We find that the efficiency of the white light electroluminescent device can be improved by injecting electron more effectively and blue light need to improve the color purity of white light.

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