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Studies on degradation and durability of Cd-free quantum dot solutions, films, and LEDs

Research Project

Project/Area Number 19H02556
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 28030:Nanomaterials-related
Research InstitutionHiroshima University

Principal Investigator

Saitow Ken-ichi  広島大学, 自然科学研究支援開発センター, 教授 (80302579)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
Fiscal Year 2021: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2020: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2019: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
Keywords量子ドット / ナノ粒子 / 半導体 / シリコン / 量子ドットLED / 量子ドットフィルム / 低次元半導体 / LED / Si量子ドット
Outline of Research at the Start

量子ドットは夢の光学材料とよばれ,量子ドットの液晶TVやタブレットが市場に出回り始めた。しかし,量子ドットの本格的普及には,解決すべき2つの大きな課題,1) 毒性,2) 耐久性,がある。1) は,Cdフリーが重要で,2) は,劣化原因や耐久性向上の研究が極めて少ない。応募者は過去14年間の研究で,光の三原色ならびに白色で発光するシリコン(Si)量子ドットの生成,世界初の青白発光のSi量子ドットLED を開発した。本研究では,Si量子ドットの溶液,フィルム,LEDの劣化の要因と耐久性向上に必要な物性・構造を解明する。実用化も見据えたCdフリーとなる量子ドットの基礎研究を世界へ発信する。

Outline of Final Research Achievements

Quantum dots are called next generation optoelectrical materials, and televisions and tablets have recently appeared on the market. However, there are two issues for further implementation. Namely, i) principal quantum dots involve heavy metals such as cadmium. 2) there are few studies on the degradation and durability. Under these situations, in the past 17 years of research, we have developed silicon (Si) quantum dots that emit three primary colors, Si quantum dots that emit white light, and Si quantum dot LEDs that emit blue-white light. In this project research, we synthesized Si quantum dots with different surface structures, and clarified the factors of deterioration of Si quantum dot solutions and Si quantum dot devices and the physical properties and structures necessary for improving durability. In the future, we will develop Cd-free quantum dots with a view to practical application.

Academic Significance and Societal Importance of the Research Achievements

本研究では,表面構造や被覆率の異なるSi量子ドットを合成した。次に,これらのSi 量子ドット溶液,Si 量子ドットフィルム,Si 量子ドット LEDにおいて,それぞれの光物性や構造の変化を追跡した。得られた結果から,量子ドットの状態,物性の変化を数値化した。特に,3種類の方法で,3つの異なる発光波長(青・赤・緑)で発光するシリコン量子ドットの合成に成功した。また,それを用いた光デバイスの作製を行うことができた。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • Research Products

    (39 results)

All 2022 2021 2020 2019

All Journal Article (15 results) (of which Peer Reviewed: 15 results,  Open Access: 1 results) Presentation (19 results) (of which Invited: 2 results) Patent(Industrial Property Rights) (5 results) (of which Overseas: 1 results)

  • [Journal Article] 4D Microspectroscopy Explores Orientation and Aggregations in π-Conjugated Polymer Films Prepared by Brush Printing2022

    • Author(s)
      Sakata Toshiki、Saitow Ken-ichi
    • Journal Title

      The Journal of Physical Chemistry Letters

      Volume: 13 Issue: 2 Pages: 653-660

    • DOI

      10.1021/acs.jpclett.1c03283

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Cellulose-Templated Stable Foldable Oriented Films with Polarized RGB Luminescence2022

    • Author(s)
      Takamatsu Masakazu、Sakata Toshiki、Kajiya Daisuke、Saitow Ken-ichi
    • Journal Title

      Chemistry of Materials

      Volume: 34 Issue: 3 Pages: 1052-1064

    • DOI

      10.1021/acs.chemmater.1c03319

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Orange-Red Si Quantum Dot LEDs from Recycled Rice Husks2022

    • Author(s)
      Terada Shiho、Ueda Honoka、Ono Taisei、Saitow Ken-ichi
    • Journal Title

      ACS Sustainable Chemistry & Engineering

      Volume: 10 Issue: 5 Pages: 1765-1776

    • DOI

      10.1021/acssuschemeng.1c04985

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Designing Efficient Si Quantum Dots and LEDs by Quantifying Ligand Effects2021

    • Author(s)
      Ono Taisei、Xu Yuping、Sakata Toshiki、Saitow Ken-ichi
    • Journal Title

      ACS Applied Materials & Interfaces

      Volume: 14 Issue: 1 Pages: 1373-1388

    • DOI

      10.1021/acsami.1c18779

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 光の強度を2,000倍に増強する酸化チタンの開発2021

    • Author(s)
      齋藤健一
    • Journal Title

      クリーンエネルギー

      Volume: 30 Pages: 16-20

    • NAID

      40022485822

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] From the structure and property of supercritical fluids to a quantum dot LED2020

    • Author(s)
      齋藤 健一
    • Journal Title

      Oyo Buturi

      Volume: 89 Issue: 1 Pages: 13-19

    • DOI

      10.11470/oubutsu.89.1_13

    • NAID

      130007783788

    • ISSN
      0369-8009, 2188-2290
    • Year and Date
      2020-01-10
    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Cost-Effective Synthesis of Silicon Quantum Dots2020

    • Author(s)
      Terada Shiho、Xin Yunzi、Saitow Ken-ichi
    • Journal Title

      Chemistry of Materials

      Volume: 32 Issue: 19 Pages: 8382-8392

    • DOI

      10.1021/acs.chemmater.0c02320

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Brush Printing Creates Polarized Green Fluorescence: 3D Orientation Mapping and Stochastic Analysis of Conductive Polymer Films2020

    • Author(s)
      Sakata Toshiki、Kajiya Daisuke、Saitow Ken-ichi
    • Journal Title

      ACS Applied Materials & Interfaces

      Volume: 12 Issue: 41 Pages: 46598-46608

    • DOI

      10.1021/acsami.0c08061

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Nanogap-Rich TiO2 Film for 2000-Fold Field Enhancement with High Reproducibility2020

    • Author(s)
      Hanatani Kaito、Yoshihara Kumi、Sakamoto Masanori、Saitow Ken-ichi
    • Journal Title

      The Journal of Physical Chemistry Letters

      Volume: 11 Issue: 20 Pages: 8799-8809

    • DOI

      10.1021/acs.jpclett.0c02286

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Mechanochemical Synthesis of Red-Light-Active Green TiO2 Photocatalysts with Disorder: Defect-Rich, with Polymorphs, and No Metal Loading2020

    • Author(s)
      Wang Yufeng、Saitow Ken-ichi
    • Journal Title

      Chemistry of Materials

      Volume: 32 Issue: 21 Pages: 9190-9200

    • DOI

      10.1021/acs.chemmater.0c02676

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Large Field Enhancement of Nanocoral Structures on Porous Si Synthesized from Rice Husks2020

    • Author(s)
      Sakamoto Masanori、Terada Shiho、Mizutani Tomoya、Saitow Ken-ichi
    • Journal Title

      ACS Applied Materials & Interfaces

      Volume: 13 Issue: 1 Pages: 1105-1113

    • DOI

      10.1021/acsami.0c14248

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 1% defect enriches MoS2 quantum dot: catalysis and blue luminescence2020

    • Author(s)
      Tang Jingmin、Sakamoto Masanori、Ohta Haruhisa、Saitow Ken-ichi
    • Journal Title

      Nanoscale

      Volume: 12 Issue: 7 Pages: 4352-4358

    • DOI

      10.1039/c9nr07612c

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Performance of Si/PEDOT:PSS Solar Cell Controlled by Dipole Moment of Additives2019

    • Author(s)
      Sakata Toshiki、Ikeda Natsumi、Koganezawa Tomoyuki、Kajiya Daisuke、Saitow Ken-ichi
    • Journal Title

      The Journal of Physical Chemistry C

      Volume: 123 Issue: 33 Pages: 20130-20135

    • DOI

      10.1021/acs.jpcc.9b05144

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Size-Selected Submicron Gold Spheres: Controlled Assembly onto Metal, Carbon, and Plastic Substrates2019

    • Author(s)
      Saitow Ken-ichi、Okamoto Yoshinori、Suemori Hidemi
    • Journal Title

      ACS Omega

      Volume: 4 Issue: 10 Pages: 14307-14311

    • DOI

      10.1021/acsomega.9b01999

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Spectral Visualization of Near-Infrared Enhancement in 2D Layered WS22019

    • Author(s)
      Sakamoto Masanori、Hanatani Kaito、Saitow Ken-ichi
    • Journal Title

      ACS Applied Electronic Materials

      Volume: 2 Issue: 2 Pages: 437-446

    • DOI

      10.1021/acsaelm.9b00673

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Presentation] 表面修飾シリコンナノ粒子の合成:表面構造と発光特性2022

    • Author(s)
      神宮 なな・早川 冬馬・小野 大成・齋藤 健一
    • Organizer
      化学工学会
    • Related Report
      2021 Annual Research Report
  • [Presentation] アルコキシシランのメカノケミカル合成2022

    • Author(s)
      三浦 結衣・柏木 努・ 福田 健・ 塩原 利夫・齋藤 健一
    • Organizer
      化学工学会
    • Related Report
      2021 Annual Research Report
  • [Presentation] マイナーアクチノイド錯イオンの赤外分光:SEIRA分光測定系の開発と実験の実際2021

    • Author(s)
      明地 省吾,平田 早紀子,日下 良二,本田 匠,為国 誠太,村松 悟,齋藤 健一,平尾 岳大,灰野 岳晴,渡邉 雅之,井口 佳哉
    • Organizer
      分子科学討論会
    • Related Report
      2021 Annual Research Report
  • [Presentation] レーザープロセスによるナノ粒子生成と光電デバイスへの活用2020

    • Author(s)
      齋藤健一
    • Organizer
      第73回CVD研究会
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] Surface functionalized silicon quantum dots synthesized by liquid phase reduction method: optical properties by spectroscopic measurements2020

    • Author(s)
      神宮 なな,早川 冬馬,小野 大成,齋藤 健一
    • Organizer
      web光化学討論会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 高量子収率のSi量子ドットの合成:表面構造からの考察2020

    • Author(s)
      小野 大成,齋藤 健一
    • Organizer
      日本化学会中四国支部大会島根大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] メカノケミカル反応によるアルコキシシランの合成2020

    • Author(s)
      三浦 結衣,齋藤 健一
    • Organizer
      日本化学会中四国支部大会島根大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Extraordinary Field Enhancement at TiO2 Nanogap: Plasmon-free Enhancement up to 2000-fold and Its High Reproductivity2019

    • Author(s)
      Kaito Hanatani, Kumi Yoshihara, Masanori Sakamoto, Ken-ichi Saitow
    • Organizer
      Material research meeting 2019
    • Related Report
      2019 Annual Research Report
  • [Presentation] H2 generation from reaction between H2O and mechanically designed Si: role of strain and dangling bond2019

    • Author(s)
      Haruhisa Ohta, Ken-ichi Saitow
    • Organizer
      The 16th Nano Bio Info Chemistry Symposium
    • Related Report
      2019 Annual Research Report
  • [Presentation] Extraordinary Field Enhancement at TiO2 Nanogap: Plasmon-free Enhancement up to 2000-fold and Its High Reproductivity2019

    • Author(s)
      Kaito Hanatani, Kumi Yoshihara, Masanori Sakamoto, Ken-ichi Saitow
    • Organizer
      The 16th Nano Bio Info Chemistry Symposium
    • Related Report
      2019 Annual Research Report
  • [Presentation] A new method for preparing uniaxial oriented films via facile solution processes2019

    • Author(s)
      Masakazu Takemoto, Daisuke Kajiya, Ken-ichi Saitow
    • Organizer
      The 16th Nano Bio Info Chemistry Symposium
    • Related Report
      2019 Annual Research Report
  • [Presentation] Si微粒子と水の反応による水素生成:ひずみ・ダングリングボンドの寄与2019

    • Author(s)
      大田晴久,齋藤健一
    • Organizer
      日本化学会中四国支部大会 徳島大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 導電性高分子配向膜の新規作製法2019

    • Author(s)
      竹本昌一,加治屋大介,齋藤健一
    • Organizer
      日本化学会中四国支部大会 徳島大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] シリコン量子ドットLEDの作成:化学構造とLEDの効率2019

    • Author(s)
      小野大成,寺田詩歩,齋藤健一
    • Organizer
      日本化学会中四国支部大会 徳島大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Functional nanomaterials synthesized by physicochemical methods2019

    • Author(s)
      Ken-ichi Saitow
    • Organizer
      The International Conference on Chemical Sciences (ICCS) 2019
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] 表面増強赤外吸収分光法によるランタノイド錯イオンの構造と電子状態の研究2019

    • Author(s)
      平田早紀子,平尾岳大,加治屋大介,村松悟,齋藤健一,灰野岳晴,江幡孝之,井口佳哉
    • Organizer
      第13回分子科学討論会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 硫黄K 殻XAFS スペクトルの異方性を利用するポリチオフェン薄膜の面内配向性の評価2019

    • Author(s)
      早川慎二郎,福田浩平,濵嶋 悠太,加治屋大介,齋藤健一
    • Organizer
      第79回分析化学討論会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Si 量子ドット LED の作製とその電子構造の考察2019

    • Author(s)
      小野大成,Xu Yuping,齋藤健一
    • Organizer
      ナノ学会第17回大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] One-Year Stable Silicon Nanocrystal Solution by Laser Ablation Synthesis2019

    • Author(s)
      Daisuke Kajiya,Ken-ichi Saitow
    • Organizer
      2019 MRS Spring meeting
    • Related Report
      2019 Annual Research Report
  • [Patent(Industrial Property Rights)] シリコン量子ドット前駆体、シリコン量子ドット、シリコン量子ドット前駆体の製造方法及びシリコン量子ドットの製造方法2020

    • Inventor(s)
      齋藤健一
    • Industrial Property Rights Holder
      齋藤健一
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2020-154517
    • Filing Date
      2020
    • Related Report
      2020 Annual Research Report
  • [Patent(Industrial Property Rights)] 金属化合物の製造方法2019

    • Inventor(s)
      齋藤健一,三浦結衣
    • Industrial Property Rights Holder
      齋藤健一,三浦結衣
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2019-159968
    • Filing Date
      2019
    • Related Report
      2019 Annual Research Report
  • [Patent(Industrial Property Rights)] 配向膜作製法2019

    • Inventor(s)
      齋藤健一,加治屋大介,竹本昌一
    • Industrial Property Rights Holder
      齋藤健一,加治屋大介,竹本昌一
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2019-207508
    • Filing Date
      2019
    • Related Report
      2019 Annual Research Report
  • [Patent(Industrial Property Rights)] 金属材料及び水素の製造方法2019

    • Inventor(s)
      齋藤健一,大田晴久
    • Industrial Property Rights Holder
      齋藤健一,大田晴久
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2020-030374
    • Filing Date
      2019
    • Related Report
      2019 Annual Research Report
  • [Patent(Industrial Property Rights)] 水素の製造方法2019

    • Inventor(s)
      齋藤健一,山本拓哉
    • Industrial Property Rights Holder
      齋藤健一,山本拓哉
    • Industrial Property Rights Type
      特許
    • Filing Date
      2019
    • Related Report
      2019 Annual Research Report
    • Overseas

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Published: 2019-04-18   Modified: 2024-12-25  

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