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Development of Highly Efficient organic Electroluminescent Devices and Improvement of Their Stability

Research Project

Project/Area Number 09045058
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionUniversity-to-University Cooperative Research
Research Field Electronic materials/Electric materials
Research InstitutionShibaura Institute of Technology

Principal Investigator

NAGATOMO Takao  Shibaura Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (70052868)

Co-Investigator(Kenkyū-buntansha) 蒋 雪茵  上海大学, 材料科学系, 教授
張 志林  上海大学, 材料科学系, 教授
HOMMA Tetsuya  Shibaura Institute of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (60286698)
JIANG Xue-yin  Shanghai University, Faculty of Materilals Science, Professor
ZHANG Zhi-lin  Shanghai University, Faculty of Materilas Science, Professor
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 1998: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1997: ¥1,500,000 (Direct Cost: ¥1,500,000)
Keywordsorganic electroluminescent cell / doped type / processes for high efficiency / improvement of device lifetime / cyclic voltammetry / conducting polymer / functional separation / carrier confinement / サイクリックボルタムメトリー / キャリア閉じ込め / 電界発光素子 / 有機蛍光材料 / 光とキャリアの閉じ込め / ポタビニールカルバゾール / 材料物性の評価
Research Abstract

Profs. Zhang Zhi-lin and Jiang Xue-yin, Shanghai University, are studying for the organic electroluminescent devices constructed with N, N'-diphenyl-N, N'-bis (3-methylphenyl)-l, 1 '-biphenyl4, 4' diamine (TPD) as the hole transport layer, 8-hydroxyquinoline aluminium (Alq3) as the electron transport layer and indium-tin oxide (ITO) and Mg-Ag as positive and negative electrodes respectively. The luminescence efficiency of the devices was increasedmore than 50 % (8918 to 13690 cd/m^<n2>) and the stability of the devices was improved tenfold by the doping Rubrene into the hole transport layer of an organic thin film electroluminescent devices. The luminous efficinecy increased by 70% and the half decay time on the basis of initial luminance became longer ten times for the EL devices introduced rubrene into the hole transport layer (TPD).
Profs. Zhang Zbi-lin and Jiang Xue-yin have cooperated research with Prof. Nagatomo's research group, Shibaura Institute of Technology, on the organic EL … More devices for five years including the term of this project. Prof. Zhang research group has given goods results on the EL devices. Prof. Zhang is the leading man in the field of electroluminescent phenomena and EL devices. This project was supported by the National Natural Science Foundation of China.
Prof. Nagatomo's research group, Shibaura Institute of Technology, are studying for the organic electroluminescent devices used perylene-doped poly (N-vinyl carbazole)(PVCz) as the light emitting layer. Poly (N-vinyl carbazole) has the higher glass transition temperature. Butylphenyl biphenyl oxidiaylos (Bu-PBD) and 8-hydroxyuinoline aluminium (AIQ) were used as a hole-blocking layer and an electron transport layer, respectively. Copper phthalocyanine (CuPc) was used as a hole injection layer. The EL cells with a wide range of wavelength from purplish-blue to yellow-green colors have been obtained by perylene doping into PVCz, From the study of carrier injection states, it proved that the electron can be directly injected into the energy levels generated by doped perylene, It was clarified that the luminance and efficiency can be improved by a hole blocking layer. an electron transport layer and a hole injection layer. Our experimental results indicates that the dopant concentration and carrier injection balance have an influence on obtaining high luminance and efficiency.
The energy gap (the difference between LUMO (Lowest Unoccupied Molecular Orbital) level and HOMO (Highest Occupied Molecular Orbital) level) of the organic materials and the conducting polymers was measured by the cyclic voltammetry method. Less

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (28 results)

All Other

All Publications (28 results)

  • [Publications] Zhi-lin Zhang, Xue-yin Jiang, Shao-hong Xu, T.Nagatomo and O.Omoto: "Stability enhancement of organic electroluminescent diode through buffer layer or rubrene doing in hole-transporting layer" Synthetic Metals. Vol. 91. 131-132 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Kojima, A.Ozawa, T.Homma, T.Nagatomo and O.Omoto: "A Structural Study for Highly Efficient Electroluminescence Cells Using Perylene-Doped Organic Materials" Journal of the Electrochemical Society. Vol. 144. 3628-3633 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Zhang Zhi-lin, Jiang Xue-yin, Xu Shao-hong, and T.Nagatomo: "Improving Stability of Organic Electroluminescent Diode by Inserting Copper Phthalocyanine Between the Anode and Hole Transport Layer" Chinese Physical Letters. Vol. 14. 302-305 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Zhang Zhi-lin, Jiang Xue-yin, Xu Shao-hong, and T.Nagatomo: "The effect of rubrene as a dopant on the efficiency and stability of organic thin film electro-luminescent devices" Journal of Physics D : Applied Physics. Vol. 31. 32-35 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 長友 隆男: "フタロシアニン類を用いた有機EL素子" 月刊 ディスプレイ. Vol. 4. 51-54 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Zhi-lin Zhang, Xue-yin Jiang, Xu Shao-hong, and T.Nagatomo and et. al.: "Stability enhancement of organic electroluminescent diode through buffer layer or Rubrene doping in hole-transporting layer" International Conference on Electroluminescence of Molecular Materials And Related Phenomena, Fukuoka, Japan. (May 21-24, 1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 長友隆男: "フタロシアニン類を用いた有機EL素子" 照明学会研究会 光関連材料・デバイス研究専門部会資料. Vol. MD-98-50. (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 長友隆男、山口正樹: "分子分散型有機EL素子" 電気学会研究会 光応用・視覚研究会資料. Vol. LAV-98-8. 7-12 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 長友隆男、山口正樹: "分子分散型有機EL素子の高効率化と多色化" 高分子学会 予稿集. Vol.47, No. 9. 1868-1869 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Zhi-lin Zhang, Xue-yin Jiang, Shao-hong Xu, T.Nagatomo: "Thin Film Electroluminescent Diodes based on Poly (vinyl carbazole)" “Organic Electroluminescent Materials and Devices" edited by Seizo Miyata and Hari Singh Nalwa, Gordon and Breach Science Publishers. 203-302 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Zhi-lin Zhang, Xue-yin Jiang, Shao-hong Xu, T.Nagatomo and O.Omoto: "Stability enhancement of organic electroluminescent diode through buffer layer or rubrene doping in hole-transporting layer" Synthetic Metals. Vol.91. 131-132 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] H.Kojima, A.Ozawa, T.Takahashi, M.Nagaoka, T.Homma, T.Nagatomo and O.Omoto: "A Structural Study for Highly Efficient Electroluminescence Cells Using Perylene-Doped Organic Materials" Journal of the Electrochemical Society. Vol.144, No.10. 3628-3633 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Zhang Zhi-lin, Jiang Xue-yin, Xu Shao-hong, T.Nagatomo and O.Omoto: "Improving Stability of Organic Electroluminescent Diode by Inserting Copper Phthalocyanine Between the Anode and Hole Transport Layer" Chinese Physical Letters. Vol.14, No.4. 302-305 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Zhang Zhi-lin, Jiang Xue-yin, Xu Shao-hong, T.Nagatomo and O.Omoto: "The effect of rubrene as a dopant on the efficiency and stability of organic thin film electroluminescent devices" Journal of Physics D : Applied Physics. Vol.31. 32-35 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Takao Nagatomo: "Organic EL Devices Using Phthalocianine System" Monthly DISPLAY. Vol.4, No.4. 51-54 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Zhi-lin, Zhang, Xue-yin Jiang, Shao-hong Xu, T.Nagatomo and O.Omoto: "Stability enhancement of organic electroluminescent diode through buffer layer or rubrene doping in hole-transporting layer" International Conference on Electroluminescence of Molecular Materials and Related Phenomena, Fukuoka, Japan, (21-24 May 1997).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Takao Nagatomo: "Organic EL Devices Using Phthalocianine System" The Meeting on Materials and Devices Related Illumination (The Illuminating Engineering Institute of Japan). Vol.MD-98-50. (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Nagatomo and M.Yamaguchi: "Processes for High Efficiency of Doped-Type Organic EL Devices" The Meeting on Light Application and Visual (The Institute of Electrical Engineers of Japan). Vol.LAV-98-8. 7-12 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M.Yamaguchi and T.Nagatomo: "Processes for High Efficiency and Multicolor of Doped-Type Organic EL Devices" Polymer Preprints, Japan (The Society of Polymer Science, Japan). Vol.47, No.9. 1868-1869 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Zhi-lin Zhang, Xue-yin Jiang, Shao-hong Xu and T.Nagatomo: "Thin Film Electroluminescent Diodes Based on Poly (vinyl carbazole)" "Organic Electroluminescent Materials and Devices", edited by Seizo Miyata and Hari Singh Nalwa, Gordon and Breach Science Publishers. 203-230 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Zhang Zhi-Lin,Jiang Xue-yin Xu Shao-hong,T.Nagatomo and O.Omoto: "The effect of rubrene as a dopant on the efficiency and Stability of organic thin film electroluminescent devices" J.Phys.D:Appl.Phys.Vol.31. 32-35 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 長友隆男: "フタロシアニン類を用いた有機EL素子" 月刊ディスプレイ. Vol.4,No.4. 51-54 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 長友隆男: "フタロシアニン類を用いた有機EL素子" 照明学会研究会 光関連材料・デバイス研究 専門部会資料. MD-98-50. (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 長友隆男 山口正樹: "分子分散型有機EL素子の高効率化" 電気学会 光応用・視覚研究会資料. LAV-98-8. 7-12 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 長友隆男 山口正樹: "分子分散型有機EL素子の高効率化と多色化" 高分子学会予稿集. Vol.47,No.9. 1868-1869 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] H.Kojima, A.Ozawa, T.Homma, T.Nagatomo et.al.: "A Structural Study for Highly Efficient Electroluminescence Cells Using Perylene-Doped Organic Materials" Journal of the Electrochemical Society. Vol.144 No.10. 3628-3633 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Zhang Zhi-Lin, Jiang Xue-yin, T.Nagatomo et.al.: "Stability enhancement of organic electroluminescent diode through buffer layer or rubrene doping in hole-transporting layer." Synthetic Metals. Vol.91. 131-132 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 長友 隆男: "フタロシアニン類を用いた有機EL素子" ディスプレイ. Vol.4 No.4. 51-54 (1998)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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