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Visualization of the internal structure of organic electronic devices in operation

Research Project

Project/Area Number 19K15441
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 29020:Thin film/surface and interfacial physical properties-related
Research InstitutionYamagata University

Principal Investigator

Ohisa Satoru  山形大学, 有機材料システム研究推進本部, 客員准教授 (90646407)

Project Period (FY) 2019-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Keywords有機EL素子 / 中性子散乱 / オペランド計測 / ガラス転移 / 有機積層膜の熱安定性 / ガラス転移温度 / 二次イオン質量分析 / 中性子反射率法 / 薄膜積層構造の電気化学安定性評価 / 有機ELデバイス / 中性子反射率 / その場測定 / 積層膜構造変化 / 劣化解析 / 中性子反射率測定
Outline of Research at the Start

スマホの利用数が急増する中、人とデバイスをつなぐスマホディスプレイのうち、最も省エネルギーな有機ELデバイスのさらなる性能向上は重要課題である。現在の最重要課題は特に耐久性が低い高効率青色発光デバイスの耐久性の向上である。本研究では、実際に駆動している最中に、どのように有機ELデバイスの内部構造が変化するかを評価する技術を初めて開発し、内部構造変化がどのように性能に影響を与えるかを明らかにする。

Outline of Final Research Achievements

In order to evaluate in real time how the heat generated when the organic light emitting devices is driven changes the interface structure of the organic stacked film, the device being driven is irradiated with neutrons to measure the reflectance, and at the same time, the voltage and brightness. No significant change was observed in the interface structure in the measured system. Since the operating lifetime of the measured device system was short, it was concluded that it was necessary to measure with a device system with a long lifetime. In order to easily evaluate the tendency of the interface structure to change in what kind of combination of organic stacked films, heat is applied to multiple combinations of organic stacked films, and secondary ion mass spectrometry of the laminated films is performed. The interface structure was disturbed above the glass transition temperature of the thin film, however the degree of disturbance depended on the combination of organic films.

Academic Significance and Societal Importance of the Research Achievements

従来、有機EL素子中の薄膜の熱安定性は材料のガラス転移温度のみで議論される事がほとんどであったが、積層膜の場合はガラス転移温度だけでなく、隣接する二層膜の有機材料の組み合わせにより積層膜の熱安定性が変化する事を示唆できた。これは種々の有機積層膜を扱う有機電子デバイスの安定性を改善するためには重大な知見であると言える。

Report

(3 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • Research Products

    (17 results)

All 2020 2019

All Journal Article (8 results) (of which Peer Reviewed: 8 results,  Open Access: 2 results) Presentation (9 results) (of which Int'l Joint Research: 3 results,  Invited: 3 results)

  • [Journal Article] Gel Permeation Chromatography Purification Process for Highly Efficient Perovskite Nanocrystal Light-Emitting Devices2020

    • Author(s)
      Ebe Hinako、Chiba Takayuki、Ohisa Satoru、Kido Junji
    • Journal Title

      Journal of Photopolymer Science and Technology

      Volume: 33 Issue: 4 Pages: 393-397

    • DOI

      10.2494/photopolymer.33.393

    • NAID

      130007867649

    • ISSN
      0914-9244, 1349-6336
    • Year and Date
      2020-07-01
    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Blue Perovskite Nanocrystal Light‐Emitting Devices via the Ligand Exchange with Adamantane Diamine2020

    • Author(s)
      Chiba Takayuki、Ishikawa Shota、Sato Jun、Takahashi Yoshihito、Ebe Hinako、Ohisa Satoru、Kido Junji
    • Journal Title

      Advanced Optical Materials

      Volume: 8 Issue: 13 Pages: 2000289-2000289

    • DOI

      10.1002/adom.202000289

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Neodymium Chloride-Doped Perovskite Nanocrystals for Efficient Blue Light-Emitting Devices2020

    • Author(s)
      Chiba Takayuki、Sato Jun、Ishikawa Shota、Takahashi Yoshihito、Ebe Hinako、Sumikoshi Shunsuke、Ohisa Satoru、Kido Junji
    • Journal Title

      ACS Applied Materials & Interfaces

      Volume: 12 Issue: 48 Pages: 53891-53898

    • DOI

      10.1021/acsami.0c11736

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Surface Crystal Growth of Perovskite Nanocrystals via Postsynthetic Lead(II) Bromide Treatment to Increase the Colloidal Stability and Efficiency of Light-Emitting Devices2020

    • Author(s)
      Chiba Takayuki、Takahashi Yoshihito、Sato Jun、Ishikawa Shota、Ebe Hinako、Tamura Kota、Ohisa Satoru、Kido Junji
    • Journal Title

      ACS Applied Materials & Interfaces

      Volume: 12 Issue: 40 Pages: 45574-45581

    • DOI

      10.1021/acsami.0c13212

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Molecular Orientations of Delayed Fluorescent Emitters in a Series of Carbazole-Based Host Materials2020

    • Author(s)
      Hisahiro Sasabe, Yuki Chikayasu, Satoru Ohisa, Hiroki Arai, Tatsuya Ohsawa, Ryutaro Komatsu, Yuichiro Watanabe, Daisuke Yokoyama, Junji Kido
    • Journal Title

      Frontiers in Chemistry

      Volume: 8 Pages: 427-427

    • DOI

      10.3389/fchem.2020.00427

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] ZnO/Polyethyleneimine Ethoxylated/Lithium Bis(trifluoromethanesulfonyl)imide for Solution-Processed Electron Injection Layers in Organic Light-Emitting Devices2019

    • Author(s)
      Yuki Chikayasu, Satoru Ohisa, Tatsuya Takahashi, Takayuki Chiba, Junji Kido
    • Journal Title

      Journal of Photopolymer Science and Technology

      Volume: 32 Issue: 4 Pages: 577-583

    • DOI

      10.2494/photopolymer.32.577

    • NAID

      130007744428

    • ISSN
      0914-9244, 1349-6336
    • Year and Date
      2019-06-24
    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Low-temperature cross-linking of polyethyleneimine ethoxylated using silane coupling agents to obtain stable electron injection layers in solution-processed organic light-emitting devices2019

    • Author(s)
      Satoru Ohisa, Dai Takashima, Takayuki Chiba, Junji Kido
    • Journal Title

      Jounal of Materials Chemistry C

      Volume: 7 Issue: 22 Pages: 6759-6766

    • DOI

      10.1039/c9tc01177c

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Doping of Tetraalkylammonium Salts in Polyethylenimine Ethoxylated for Efficient Electron Injection Layers in Solution-Processed Organic Light-Emitting Devices2019

    • Author(s)
      Satoru Ohisa, Michinori Suzuki, Takayuki Chiba, Junji Kido
    • Journal Title

      ACS Applied Materials & Interfaces

      Volume: 11 Issue: 28 Pages: 25351-25357

    • DOI

      10.1021/acsami.9b06895

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] カルバゾール誘導体ホスト中での熱活性化遅延蛍光分子の分子配向2020

    • Author(s)
      笹部 久宏, 近安 佑樹, 大久 哲, 荒井 博貴, 大澤 達矢, 小松 龍太郎, 渡邊 雄一郎, 横山 大輔, 城戸 淳二
    • Organizer
      第67回 春季応用物理学会学術講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] Two-Dimensional Ca2Nb3O10 Perovskite Nanosheets for Electron Injection Layers in Organic Light-Emitting Diodes2019

    • Author(s)
      Satoru Ohisa, Tatsuya Hikichi, Takayuki Chiba, Junji Kido, Yong-Jin Pu
    • Organizer
      2019 MRS Spring Meeting & Exhibit
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Indolocarbazole-Based Host Compounds for Solution-Processed Tandem OLEDs2019

    • Author(s)
      Yong-Jin Pu, Satoru Ohisa, Hitoshi Fukuda, Tatsuya Takahashi, Masahiro Igarashi, Tatsuya Hikichi, Ryutaro Komatsu, Emi Ueki, Takayuki Chiba, Junji Kido
    • Organizer
      韓国高分子学会
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 酸化亜鉛/エトキシ化ポリエチレンイミン/リチウムビストリフルオロメタンサルフォニルイミド電子注入層を用いた低電圧駆動する塗布型有機EL素子2019

    • Author(s)
      近安 佑樹, 大久 哲, 高橋 達弥, 千葉 貴之, 城戸 淳二
    • Organizer
      The 36th International Conference of Photopolymer Science and Technology
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 還元リンモリブデン酸を正孔注入層に用いた 有機EL素子2019

    • Author(s)
      大久 哲, 遠藤 康平, 近安 佑樹, 千葉 貴之, 城戸 淳二
    • Organizer
      第68回高分子討論会
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] アニオン・配位子置換によるペロブスカイト量子ドット LEDの高性能化2019

    • Author(s)
      千葉 貴之, 林 幸宏, 保志 圭吾, 大 久 哲, 増原 陽人, 城戸 淳二
    • Organizer
      第68回高分子討論会
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Chemical Reduction of Phosphomolybdic Acids by Metal Dopants for Post-Treatment Free Solution-Processed Hole Injection Layers in Organic Light-Emitting Devices2019

    • Author(s)
      Yuki Chikayasu, Satoru Ohisa, Kohei Endo, Takayuki Chiba, Junji Kido
    • Organizer
      千葉 貴之1・林 幸宏1・保志 圭吾1・大 久 哲1・増原 陽人1・城戸 淳二
    • Related Report
      2019 Research-status Report
  • [Presentation] Indolocarbazole-Based Thermally Activated Delayed Fluorescence Emitters for Solution-Processed Organic Light-Emitting Devices2019

    • Author(s)
      Yu-Hong Cheng, Satoru Ohisa, Junji Kido
    • Organizer
      The Second International Conference of Polymeric and Organic Materials in Yamagata University
    • Related Report
      2019 Research-status Report
  • [Presentation] Chemically Reduced Phosphomolybdic Acids by Metal Dopants for Annealing-Free Solution-Processed Hole Injection Layers in Organic Light-Emitting Devices2019

    • Author(s)
      Yuki Chikayasu, Satoru Ohisa, Kohei Endo, Takayuki Chiba, Junji Kido
    • Organizer
      The Second International Conference of Polymeric and Organic Materials in Yamagata University
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2022-01-27  

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