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Basic research on expression of neuromorphic functions by AC-driven insulated organic electroluminescent devices

Research Project

Project/Area Number 21K18720
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 21:Electrical and electronic engineering and related fields
Research InstitutionOsaka University

Principal Investigator

KAJII Hirotake  大阪大学, 大学院工学研究科, 准教授 (00324814)

Co-Investigator(Kenkyū-buntansha) 近藤 正彦  大阪大学, 大学院工学研究科, 教授 (90403170)
Project Period (FY) 2021-07-09 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2022: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2021: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Keywords有機EL / 強誘電性 / 強誘電性ポリマー / 交流駆動
Outline of Research at the Start

半導体分野では人の脳の情報処理を模倣するニューロモルフィックシステムの構築が大変注目されている。ソフトではなくデバイスレベルからのシステム構築では、脳内で情報伝達やメモリ機能をつかさどっていると考えられるニューロンとシナプスを人工的な素子に置き換える検討が進められている。本研究では、生体のように柔らかい強誘電性ポリマーからなるキャパシタを内包した絶縁型交流駆動有機ELを印刷技術で作製し、素子の非線形的な電気光学特性の挙動を明らかにする。この素子によるニューロモルフィック素子機能の発現のため、電気信号ではなく光信号で情報伝達を行う光シナプスの動作原理の探求を行う。

Outline of Final Research Achievements

From the viewpoint of further development of the semiconductor field, the construction of neuromorphic systems that mimic the information processing of the human brain has been attracting attention, and there have been many attempts in recent years to apply this technology as an operating principle for artificial synaptic devices in brain-based computing.
In this study, we investigated the realization of AC-EL (alternating current driven organic electroluminescent device) technology incorporating ferroelectric polymer layers, which transmits information by controlling light intensity according to the frequency of electrical signal input. We confirmed that the polarization state of the AC-EL, which has memory properties due to its ferroelectricity, affects the luminescence properties and that the luminescence intensity varies with the polarization state of the ferroelectric polymer.

Academic Significance and Societal Importance of the Research Achievements

次世代のニューロモルフィックシステムの構築が注目され,その機構を模倣する手法の1つとして,電気信号の入力頻度により,素子抵抗を制御する電気抵抗変化するメモリスタを,脳型コンピューティングにおける人工シナプス素子の動作原理として応用する試みが近年盛んである.
本研究では,交流駆動有機EL(AC-EL)技術の誘電体層にやわらかい強誘電性ポリマーを採用し,印刷技術で作製可能なデバイス技術を確立した.この作製技術を利用して強誘電性ポリマーを組み込んだAC-EL素子は,電気信号の入力頻度により,光信号で情報伝達を行う光シナプスの動作原理を開発していく上で有機EL技術の応用の可能性を示した.

Report

(3 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • Research Products

    (13 results)

All 2023 2022 2021 Other

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (10 results) (of which Int'l Joint Research: 6 results,  Invited: 2 results) Remarks (2 results)

  • [Journal Article] Fabrication and Characteristics of Weak Microcavity AC-driven Insulated Polymer Electroluminescent Devices with Dielectric Film Mirrors Utilizing Ferroelectric Polymer Poly(vinylidene fluoride-trifluoroethylene) Film2022

    • Author(s)
      Kajii Hirotake、Takayama Yuto、Morifuji Masato、Kondow Masahiko
    • Journal Title

      2022 29th International Workshop on Active-Matrix Flatpanel Displays and Devices (AM-FPD)

      Volume: - Pages: 150-151

    • DOI

      10.23919/am-fpd54920.2022.9851280

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Presentation] 絶縁型交流駆動有機EL素子の狭帯域発光に向けた無機銅系CuSCNを用いた無機・有機ハイブリッド誘電体及び半導体ミラーの作製の検討2023

    • Author(s)
      梶井 博武、高山 祐人、近藤 正彦
    • Organizer
      電子情報通信学会2023年総合大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Ferroelectric Properties of Dielectric Film Mirrors Utilizing Poly(vinylidene fluoride) Derivatives and Their Applications of AC-driven Insulated Organic Electroluminescence Devices2022

    • Author(s)
      Hirotake Kajii, Yuto Takayama, Masato Morifuji, Masahiko Kondow
    • Organizer
      12th International Symposium on Organic Molecular Electronics (ISOME2022)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Fabrication and Characteristics of Weak Microcavity AC-driven Insulated Polymer Electroluminescent Devices with Dielectric Film Mirrors Utilizing Ferroelectric Polymer Poly(vinylidene fluoride-trifluoroethylene) Film2022

    • Author(s)
      Hirotake Kajii, Yuto Takayama, Masato Morifuji, Masahiko Kondow,
    • Organizer
      29th International Workshop on Active-Matrix Flatpanel Displays and Devices (AM-FPD22)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Improved Characteristics of Polymer Light-Emitting Devices Utilizing Solution-Processable Inorganic Materials2022

    • Author(s)
      Hirotake Kajii, Yuto Takayama, Shinsei Yamada, Maowei Huang, Masato Morifuji, Masahiko Kondow
    • Organizer
      The 21st International Discussion & Conference on Nano Interface Controlled Electronic Devices (IDC-NICE 2022)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 高分子強誘電体ミラーを内包した絶縁型交流駆動有機ELの発光における先鋭化とメモリー効果2022

    • Author(s)
      高山祐人、梶井 博武、森藤 正人、近藤 正彦
    • Organizer
      応用物理学会関西支部 2022年 度 創設75周年記念講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Improved Characteristics of Polymer Light-Emitting Devices Utilizing Solution-Processable Inorganic Copper(I) Thiocyanate2022

    • Author(s)
      Hirotake Kajii, Yuto Takayama, Shinsei Yamada, Maowei Huang, Masato Morifuji, Masahiko Kondow
    • Organizer
      13th International Conference on Nano-Molecular Electronics (ICNME2022)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 無機・有機ハイブリット誘電体ミラーを内包した絶縁型交流駆動有機EL素子の過渡応答特性の検討2022

    • Author(s)
      梶井博武,高山祐人,黄毛蔚,森藤正人, 近藤正彦
    • Organizer
      電子情報通信学会有機エレクトロニクス研究会
    • Related Report
      2021 Research-status Report
  • [Presentation] Characteristics of Dielectric Film Mirrors Using Ferroelectric Polyvinylidene Fluoride Derivatives and its Application to Color Tunable AC-driven Insulated Organic Electroluminescent Devices with Microcavity Structures2021

    • Author(s)
      Hirotake Kajii, Maowei Huang, Masato Morifuji, Masahiko Kondow
    • Organizer
      International Conference on Flexible and Printed Electronics (ICFPE 2021)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Narrowband Light Detection and Narrowband Emission from Polymer Devices Based on Thick Films2021

    • Author(s)
      Hirotake Kajii, Masahiko Kondow
    • Organizer
      The 20th International Discussion & Conference on Nano Interface Controlled Electronic Devices (IDC-NICE 2021)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Optical and Electrical Properties of Dielectric Film Mirrors Using Polyvinylidene Fluoride Derivatives towards AC-driven Insulated Polymer Electroluminescent Devices2021

    • Author(s)
      Hirotake Kajii, Yuto Takayama, Maowei Huang, Masato Morifuji, Masahiko Kondow
    • Organizer
      31th Annual Meeting of MRS-J
    • Related Report
      2021 Research-status Report
  • [Remarks] 大阪大学大学院工学研究科電気電子情報通信工学専攻近藤研究室

    • URL

      http://www.e3.eei.eng.osaka-u.ac.jp/

    • Related Report
      2022 Annual Research Report
  • [Remarks] 大阪大学大学院工学研究科電気電子情報通信工学専攻近藤研究室

    • URL

      http://www.e3.eei.eng.osaka-u.ac.jp/index.html

    • Related Report
      2021 Research-status Report

URL: 

Published: 2021-07-13   Modified: 2024-01-30  

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