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Creations of high-performance upconversion crystal systems and their scientific fundamentals based on molecular thermal engineering

Research Project

Project/Area Number 20H02082
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 19020:Thermal engineering-related
Research InstitutionTokyo Institute of Technology

Principal Investigator

Murakami Yoichi  東京工業大学, 科学技術創成研究院, 教授 (80526442)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥8,450,000 (Direct Cost: ¥6,500,000、Indirect Cost: ¥1,950,000)
Fiscal Year 2020: ¥7,930,000 (Direct Cost: ¥6,100,000、Indirect Cost: ¥1,830,000)
Keywords分子熱工学 / 光アップコンバージョン / 熱力学考究に基づく材料創製 / 結晶成長と分子混合の熱力学 / 三重項励起子の輸送現象 / 熱力学と温度制御に基づく材料創製 / 結晶成長の熱力学と速度論
Outline of Research at the Start

本課題は,現在太陽電池等の光エネルギー変換に利用できない長波長光を,利用可能なより短波長な光に変換する光アップコンバージョン(UC)に関する.この材料では,長波長光を吸収して励起状態を作る「増感分子」と,短波長シフトした光を発する「発光分子」とを分子レベルで安定混合させる必要があり,それが課題となっている.本研究では,分子熱工学の観点から,熱力学および速度論への考究に基づき,安定かつ高効率なUC材料を創製するとともに,その基盤学術の構築を行う.

Outline of Final Research Achievements

In broad light-energy conversions including photocatalysts and photovoltaics, light with wavelengths longer than the material's threshold wavelength cannot be used in principle, which fundamentally limits their conversion efficiencies. This research is for photon upconversion (UC), which converts unused long-wavelength light into usable shorter-wavelength light. Most conventional UC materials are solutions in organic solvents and are flammable, volatile, and toxic, making them far from real applications. Additionally, it cannot be used in the presence of oxygen, has low efficiency, and requires high-intensity incident light. This research has completely resolved these problems, by creating a new concept of a binary solid-solution crystal formed by thermodynamic driving force; the developed materials can be used in the air, and it can be used with irradiation light of lower intensity than sunlight. We have created a revolutionary crystalline material system that efficiently performs UC.

Academic Significance and Societal Importance of the Research Achievements

上述のように、未利用な太陽光の長波長部分を利用可能なより短波長光に変換するUCについて従来想像し得なかった革命的な材料系を創出した。学術的には、(i)熱力学的な駆動力により形成される二成分固溶体結晶という独自の新概念を実証したこと、(ii)温度勾配制御を用いて基板上への固溶体多結晶膜生成を実現したこと、(iii)固溶体結晶中では励起子輸送が促進されることを実証したこと、(iv)多数の論文成果を産み出したこと、社会的には、(i)太陽光エネルギーの利用効率の向上を行う現実性のある高性能手段を創出したこと、(ii)国内企業との共同研究開始により社会実装に向けた動きを開始したこと、が意義となっている。

Report

(4 results)
  • 2023 Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (17 results)

All 2023 2022 2021 Other

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 4 results) Presentation (8 results) (of which Int'l Joint Research: 5 results,  Invited: 2 results) Remarks (3 results) Patent(Industrial Property Rights) (2 results)

  • [Journal Article] Solvent-free temperature gradient melt formation of efficient visible-to-UV photon upconversion organic films with subsolar threshold and over 100 h photostability in air2023

    • Author(s)
      Enomoto Riku、Murakami Yoichi
    • Journal Title

      Journal of Materials Chemistry C

      Volume: 11 Issue: 5 Pages: 1678-1683

    • DOI

      10.1039/d2tc04578h

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Stable and low-threshold photon upconversion in nondegassed water by organic crystals2023

    • Author(s)
      Murakami Yoichi、Enomoto Riku
    • Journal Title

      Frontiers in Chemistry

      Volume: 11 Pages: 1-7

    • DOI

      10.3389/fchem.2023.1217260

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Absorption bandwidth broadening of photon upconversion solid-solution organic crystals by co-dissolution of multiple sensitizers2023

    • Author(s)
      Enomoto Riku、Murakami Yoichi
    • Journal Title

      Applied Physics Express

      Volume: 16 Issue: 9 Pages: 092001-092001

    • DOI

      10.35848/1882-0786/acf6a7

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] van der Waals solid solution crystals for highly efficient in-air photon upconversion under subsolar irradiance2021

    • Author(s)
      Enomoto Riku, Hoshi Megumi, Oyama Hironaga, Agata Hideki, Kurokawa Shinichi, Kuma Hitoshi, Uekusa Hidehiro, Murakami Yoichi
    • Journal Title

      Materials Horizons

      Volume: 8 Issue: 12 Pages: 3449-3456

    • DOI

      10.1039/d1mh01542g

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 低強度可視光を紫外光に変換する革新的なフォトン・アップコンバージョン固体膜の創出:開発した温度勾配制御装置による分子融液からの基板上への多結晶膜生成2023

    • Author(s)
      榎本 陸, 村上 陽一
    • Organizer
      第60回日本伝熱シンポジウム
    • Related Report
      2022 Annual Research Report
  • [Presentation] Photon Upconversion, Forced-Flow Thermocells, and Covalent Organic Frameworks2023

    • Author(s)
      Yoichi Murakami
    • Organizer
      10th US-Japan Joint Seminar on Nanoscale Transport Phenomena
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] IMPROVEMENT OF CRYSTALLINITY OF PHOTON UPCONVERSION ORGANIC FILMS FORMED ON A SUBSTRATE UNDER A CONTROLLED TEMPERATURE GRADIENT2023

    • Author(s)
      Riku Enomoto, Yoichi Murakami
    • Organizer
      The 17th International Heat Transfer Conference (IHTC-17)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 熱力学安定・高効率・超低閾値なフォトン・アップコンバージョン固溶体結晶の創出と特性解明:固体内の分子間エネルギー移動を用いた太陽光エネルギーの利用効率増大技術2022

    • Author(s)
      榎本 陸, 星 めぐみ, 大山 滉永, 縣 秀樹,黒川 真一, 熊 均, 植草 秀裕, 村上 陽一
    • Organizer
      第59回日本伝熱シンポジウム
    • Related Report
      2022 Annual Research Report
  • [Presentation] 応用に適したフォトン・アップコンバージョン材料の追求2022

    • Author(s)
      村上 陽一
    • Organizer
      一般社団法人 有機エレクトロニクス材料研究会
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] Development of thermodynamically stable organic photon upconverters based on inter-molecular energy transfer: Photonic energy conversion technology to enhance solar utilization efficiency2021

    • Author(s)
      Riku ENOMOTO, Megumi HOSHI, Hideki AGATA, Shinichi KUROKAWA, Hitoshi KUMA, Yoichi MURAKAMI
    • Organizer
      2nd Asian Conference on Thermal Sciences (2nd ACTS)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Development of photon upconversion crystals and elucidations of their properties2021

    • Author(s)
      Riku ENOMOTO, Yoichi MURAKAMI
    • Organizer
      Pacifichem 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Search for optimal methods to generate photon upconversion crystals2021

    • Author(s)
      Riku Enomoto, Yoichi Murakami
    • Organizer
      Pacifichem 2021
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Remarks] https://murakami.zc.iir.titech.ac.jp/

    • Related Report
      2022 Annual Research Report
  • [Remarks] 研究代表者のホームページ

    • URL

      http://www.fel.zc.iir.titech.ac.jp/

    • Related Report
      2021 Annual Research Report
  • [Remarks] 研究者のwebページ

    • URL

      http://www.es.mes.titech.ac.jp/index.html

    • Related Report
      2020 Annual Research Report
  • [Patent(Industrial Property Rights)] 有機固体アップコンバージョン材料2023

    • Inventor(s)
      村上 陽一、榎本 陸
    • Industrial Property Rights Holder
      村上 陽一、榎本 陸
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2023-147188
    • Filing Date
      2023
    • Related Report
      2022 Annual Research Report
  • [Patent(Industrial Property Rights)] 有機固体アップコンバージョン材料2021

    • Inventor(s)
      村上陽一,榎本陸,星めぐみ,黒川真一,熊均,縣秀樹,脇田太介
    • Industrial Property Rights Holder
      村上陽一,榎本陸,星めぐみ,黒川真一,熊均,縣秀樹,脇田太介
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2021-169019
    • Filing Date
      2021
    • Related Report
      2021 Annual Research Report

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Published: 2020-04-28   Modified: 2025-01-30  

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