• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Molecular Engineering and Application of Highly Fluorescent Liquid Crystalline Materials without Absorption in Visible Light

Research Project

Project/Area Number 20H02710
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 32020:Functional solid state chemistry-related
Research InstitutionKyoto Institute of Technology

Principal Investigator

Sakurai Tsuneaki  京都工芸繊維大学, 分子化学系, 講師 (50632907)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥18,330,000 (Direct Cost: ¥14,100,000、Indirect Cost: ¥4,230,000)
Fiscal Year 2022: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2021: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2020: ¥11,310,000 (Direct Cost: ¥8,700,000、Indirect Cost: ¥2,610,000)
KeywordsESIPT / 液晶 / 蛍光 / ドーパント / 偏光発光 / ASE / 励起状態 / 発光ドーパント / 無輻射失活 / ポテンシャルエネルギー / 励起状態分子内プロトン移動 / 励起状態計算 / 電場配向 / 異方発光
Outline of Research at the Start

汎用的な液晶ディスプレイ技術が確立された現在でも、液晶を用いた新しい電子デバイスの開拓余地は残されている。特に、光吸収/発光性の色素を液晶にドープしたホスト-ゲスト型液晶材料はその外場応答性と協同し、さまざまな機能を発現できる可能性がある。
本研究では、発光ゲストに求められる重要な性質である、①ホスト液晶への高い混和性、②ホスト液晶中での高い可視域発光効率、③それ自体は色を持たないこと、④自己吸収が少ないこと、⑤ドープ量を上昇しても濃度消光を起こさないこと、の全てを満たす材料を、実験・計算的手法を統合し、合理設計し、自発光性ディスプレイ、偏光発光フィルム、液晶レーザー、等の応用に取り組む。

Outline of Final Research Achievements

In this research project, the project leader found that excited-state intramolecular proton transfer-type fluorophores (ESIPT) are promising candidates as a fluorescent dopant for liquid crystals, which relies on their colorless, visible emissive, highly miscible, and non-concentration quenching properties. For this achivement, it is needed to overcome the problem of low fluorescent quantum yield (Φ) of ESIPT fluorophores in solutions and liquid crystals (LCs). The project leader developed a molecular design strategy of introducing conjugated substituents to 2-(2-hydroxyphenylbenzothiazole) (HBT), a famous ESIPT core, which is quite effective for increasing Φ values in solutions and LCs. This strategy was rationalized by means of a quantum chemical calculation method. The prepared room-temperature LCs doped with a newly-designed HBT derivative show polarized emission and amplified spontaneous emission, which opens a new door to the possibility of novel LC-based optical devices.

Academic Significance and Societal Importance of the Research Achievements

これまでESIPT型蛍光体は固体状態でのみ効率よく発光する材料という認識であったが、研究代表者の今回の取り組みによって、適切な置換基導入を施せば、溶媒中や液晶中でも高い蛍光量子収率を示すことが可能であることが明らかとなった。これにより、非着色・可視域発光する有機材料のレパートリーが大きく増大することが考えられ、有機発光材料の研究分野の広がりを促進する学術的意義があると考えられる。また、非着色・可視域発光という特徴を活かし、環境光下では目立たないが紫外光で照らした際だけ色が見えるような表示素子としての応用が考えられ、将来的にこのような素子の実装の可能性も示すことができたと考えられる。

Report

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

    (38 results)

All 2023 2022 2021 2020

All Journal Article (20 results) (of which Int'l Joint Research: 6 results,  Peer Reviewed: 20 results,  Open Access: 4 results) Presentation (18 results) (of which Int'l Joint Research: 6 results,  Invited: 9 results)

  • [Journal Article] Organic Fluorophores That Emit Ultraviolet Light in the Aggregated States2022

    • Author(s)
      Masaki Shimizu, Tsuneaki Sakurai
    • Journal Title

      Aggregate

      Volume: 3 Issue: 2

    • DOI

      10.1002/agt2.144

    • Related Report
      2022 Annual Research Report 2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Development of thermoresponsive near-ultraviolet photoluminescent liquid crystals using hexyloxy-terminated fluorinated tolane dimers connected with an alkylene spacer2022

    • Author(s)
      Shigeyuki Yamada, Eiji Uto, Tsuneaki Sakurai, Tsutomu Konno
    • Journal Title

      Journal of Molecular Liquid

      Volume: 362 Pages: 119755-119755

    • DOI

      10.1016/j.molliq.2022.119755

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 励起状態分子内プロトン移動を示す高効率蛍光体の設計追究と液晶場における発光特性2022

    • Author(s)
      櫻井 庸明
    • Journal Title

      液晶

      Volume: 26 Pages: 61-71

    • Related Report
      2022 Annual Research Report 2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Development of photoluminescent liquid-crystalline dimers bearing two fluorinated tolane-based luminous mesogens2022

    • Author(s)
      Shigeyuki Yamada, Eiji Uto, Keigo Yoshida, Tsuneaki Sakurai, Tsutomu Konno
    • Journal Title

      Journal of Molecular Liquid

      Volume: 363 Pages: 119884-119884

    • DOI

      10.1016/j.molliq.2022.119884

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Effect of fluorine atoms in flexible chains on the phase transitions and photophysical behavior of D-π-A-type 4-alkoxy-4'-cyanodiphenylacetylene2022

    • Author(s)
      Shigeyuki Yamada, Keigo Yoshida, Tsuneaki Sakurai, Mitsuo Hara, Tsutomu Konno
    • Journal Title

      Molecular System Design & Engineering

      Volume: 7 Issue: 7 Pages: 720-724

    • DOI

      10.1039/d2me00057a

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Oriented Nanowire Arrays with Phthalocyanine – C<sub>60</sub> Multi-Heterojunctions2021

    • Author(s)
      Nobuoka Masaki, Koshi Kamiya, Shugo Sakaguchi, Tsuneaki Sakurai, Shu Seki
    • Journal Title

      Journal of Photopolymer Science and Technology

      Volume: 34 Issue: 2 Pages: 167-174

    • DOI

      10.2494/photopolymer.34.167

    • NAID

      130008119676

    • ISSN
      0914-9244, 1349-6336
    • Year and Date
      2021-06-11
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Remarkable Increase of Fluorescence Quantum Efficiency by Cyano Substitution on An ESIPT Molecule 2-(2-Hydroxyphenyl)benzothiazole: Highly Luminescent Liquid Crystal Dopant2021

    • Author(s)
      Tsuneaki Sakurai, Masaya Kobayashi, Hiroyuki Yoshida, Masaki Shimizu
    • Journal Title

      Crystals

      Volume: 11 Issue: 9 Pages: 1105-1105

    • DOI

      10.3390/cryst11091105

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Charge Carrier Mobility of 1,6-Dibromopyrene Single Crystal Grown by Solution Method on Substrate2021

    • Author(s)
      Kojiro Naito, Yuhi Inada, Tsuneaki Sakurai, Masaki Shimizu, Takeshi Yamao
    • Journal Title

      Journal of Electronic Materials

      Volume: 51 Issue: 2 Pages: 813-821

    • DOI

      10.1007/s11664-021-09345-1

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Ultra-fast single-crystal polymerization of large-sized covalent organic frameworks2021

    • Author(s)
      Lan Peng, Qianying Guo, Chaoyu Song, Samrat Ghosh, Huoshu Xu, Liqian Wang, Dongdong Hu, Lei Zhao, Qiaowei Li, Tsuneaki Sakurai, Hugen Yan, Shu Seki, Yunqi Liu, Dacheng Wei
    • Journal Title

      Nature Communications

      Volume: 12 Issue: 1 Pages: 5077-5077

    • DOI

      10.1038/s41467-021-24842-x

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Ubiquitous organic molecule-based free-standing nanowires with ultra-high aspect ratios2021

    • Author(s)
      Kamiya Koshi、Kayama Kazuto、Nobuoka Masaki、Sakaguchi Shugo、Sakurai Tsuneaki、Kawata Minori、Tsutsui Yusuke、Suda Masayuki、Idesaki Akira、Koshikawa Hiroshi、Sugimoto Masaki、Lakshmi G. B. V. S.、Avasthi D. K.、Seki Shu
    • Journal Title

      Nature Communications

      Volume: 12 Issue: 1 Pages: 4025-4025

    • DOI

      10.1038/s41467-021-24335-x

    • NAID

      120007142195

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] 液晶性を有する励起状態分子内プロトン移動型発光体の設計と応用2021

    • Author(s)
      櫻井 庸明
    • Journal Title

      液晶

      Volume: 25 Pages: 93-104

    • NAID

      40022573068

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Metal-Free Organic Luminophores That Exhibit Dual Fluorescence and Phosphorescence Emission at Room Temperature2021

    • Author(s)
      Masaki Shimizu, Tsuneaki Sakurai
    • Journal Title

      ChemPlusChem

      Volume: 86 Issue: 3 Pages: 446-459

    • DOI

      10.1002/cplu.202000783

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A structural parameter to link molecular geometry to macroscopic orientation in discotic liquid crystals: study of metalloporphyrin tapes2021

    • Author(s)
      Kobayashi Yoshiyuki、Muranaka Atsuya、Kato Kenichi、Saeki Akinori、Tanaka Takayuki、Uchiyama Masanobu、Osuka Atsuhiro、Aida Takuzo、Sakurai Tsuneaki
    • Journal Title

      Chemical Communications

      Volume: 57 Issue: 10 Pages: 1206-1209

    • DOI

      10.1039/d0cc07241a

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Towards Macroscopically Anisotropic Functionality: Oriented Metallo-supramolecular Polymeric Materials Induced by Magnetic Fields2021

    • Author(s)
      Tsung-Han Tu, Tsuneaki Sakurai, Shu Seki, Yasuhiro Ishida, Yi-Tsu Chan
    • Journal Title

      Angewandte Chemie International Edition

      Volume: 60 Issue: 4 Pages: 1923-1928

    • DOI

      10.1002/anie.202012284

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Efficient Emission of Ultraviolet Light by Solid State Organic Fluorophores: Synthesis and Characterization of 1,4-dialkeny-2,5-dioxybenzenes2021

    • Author(s)
      Masaki Shimizu, Kenta Nishimura, Rika Hirakawa, Tsuneaki Sakurai
    • Journal Title

      Chemistry -A European Journal

      Volume: 27 Issue: 5 Pages: 1626-1637

    • DOI

      10.1002/chem.202003526

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Highly Efficient Solid-State Intra-Track Polymerization of Ethynyl-Substituted Spirobifluorenes Triggered by Swift Heavy Ion Irradiations2020

    • Author(s)
      Shugo Sakaguchi, Tsuneaki Sakurai, Akira Idesaki, Hiroshi Koshikawa, Masaki Sugimoto, and Shu Seki
    • Journal Title

      Journal of Photopolymer Science and Technology

      Volume: 33 Issue: 1 Pages: 91-96

    • DOI

      10.2494/photopolymer.33.91

    • NAID

      130007867515

    • ISSN
      0914-9244, 1349-6336
    • Year and Date
      2020-07-01
    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Extended Conjugation of ESIPT-Type Dopants in Nematic Liquid Crystalline Phase for Enhancing Fluorescence Efficiency and Anisotropy2020

    • Author(s)
      Wanying Zhang, Satoshi Suzuki, Tsuneaki Sakurai, Hiroyuki Yoshida, Yusuke Tsutsui, Masanori Ozaki, Shu Seki
    • Journal Title

      Physical Chemistry Chemical Physics

      Volume: 22 Issue: 48 Pages: 28393-28400

    • DOI

      10.1039/d0cp05415a

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Frustrated Layered Self-Assembly Induced Superlattice from Two-Dimensional Nanosheets2020

    • Author(s)
      Huanjun Lu, Xiaoyan Zhang, Tsuneaki Sakurai, Xiaohong Li, Yingfeng Tu, Jun Guo, Shu Seki, Christopher Y. Li, Goran Ungar
    • Journal Title

      Nano Letters

      Volume: 20 Issue: 12 Pages: 8647-8653

    • DOI

      10.1021/acs.nanolett.0c03352

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Ultrathin Two Dimensional (2D) Supramolecular Assembly and Anisotropic Conductivity of an Amphiphilic Naphthalene-Diimide2020

    • Author(s)
      Anurag Mukherjee, Tsuneaki Sakurai, Shu Seki, Suhrit Ghosh
    • Journal Title

      Langmuir

      Volume: 36 Issue: 43 Pages: 13096-13103

    • DOI

      10.1021/acs.langmuir.0c02604

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Porphyrin Nanowires Developed by High-Energy Single Particle-Triggered Intra-Track Polymerization: Design, Property, and Conjugation with Metal Nanoparticles2020

    • Author(s)
      Tsuneaki Sakurai, Shugo Sakaguchi, Yuki Takeshita, Kazuto Kayama, Akifumi Horio, Masaki Sugimoto, Tetsuya Yamaki, Atsuya Chiba, Yuichi Saitoh, G.B.V.S. Lakshmi, Devesh Kumar Avasthi, and Shu Seki
    • Journal Title

      ACS Appl. Nano. Mater.

      Volume: 3 Issue: 6 Pages: 6043-6053

    • DOI

      10.1021/acsanm.0c01242

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Rational Design of Efficient Fluorophores Serving as High Concentration Dopant for Liquid Crystals2023

    • Author(s)
      Tsuneaki Sakurai
    • Organizer
      International CPL and CPEL Conference 2023
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 励起状態プロトン移動型水溶性蛍光体の設計、合成および光物性2023

    • Author(s)
      西口 直輝, 櫻井 庸明, 清水 正毅
    • Organizer
      日本化学会第103春季年会
    • Related Report
      2022 Annual Research Report
  • [Presentation] ESIPT型蛍光体の発光効率向上のための分子設計探索と発光性液晶への展開2022

    • Author(s)
      櫻井 庸明
    • Organizer
      第181回東海高分子研究会講演会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] 励起状態分子内プロトン移動型蛍光体の発光効率向上と液晶中での機能開拓2022

    • Author(s)
      櫻井 庸明
    • Organizer
      2022KIPS若手高分子シンポジウム
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Amplified Spontaneous Emission of Excited-State Intramolecular Proton Transfer Emitters in Liquid Crystals2022

    • Author(s)
      Masaya Kobayashi, Tsuneaki Sakurai, Hiroyuki Yoshida, Masaki Shimizu
    • Organizer
      Optics of Liquid Crystals 2021-Satellite Workshop 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ESIPT型有機蛍光体の媒質中における蛍光量子収率向上のための分子設計2022

    • Author(s)
      小林 雅弥, 櫻井 庸明, 吉田 浩之, 清水 正毅
    • Organizer
      日本化学会第102春季年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Fabrication of Organic Nanowires Developed by Radiation-Triggered Polymerization of Organic Molecules in Heavy Ion Tracks2022

    • Author(s)
      Tsuneaki Sakurai
    • Organizer
      The Miller Online Workshop on Radiation Chemistry
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 良好なアモルファス性を有する紫外蛍光性1,4-ジアリール-2,5-ジオキシベンゼンの開発2022

    • Author(s)
      大草 葵, 櫻井 庸明, 清水 正毅
    • Organizer
      日本化学会第102春季年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 1,4-ジアロイル-2-シロキシ-5-シリルメチルオキシベンゼンのアモルファス性と室温りん光性2022

    • Author(s)
      土佐林 結衣, 櫻井 庸明, 清水 正毅
    • Organizer
      日本化学会第102春季年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 励起状態分子内プロトン移動を示す高効率蛍光体の設計追究とその液晶場における発光特性2021

    • Author(s)
      櫻井 庸明
    • Organizer
      2021年日本液晶学会討論会
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] Tuning of aggregation-induced emission by extended conjugation: ESIPT-type fluorescent dopants in liquid crystalline matrices2021

    • Author(s)
      Tsuneaki Sakurai, Wanying Zhang, Satoshi Suzuki, Hiroyuki Yoshida, Masanori Ozaki, Shu Seki
    • Organizer
      PACIFICHEM 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 励起状態分子内プロトン移動型発光体の液晶中での発光特性:発光量子収率向上への分子設計2021

    • Author(s)
      小林 雅弥, 櫻井 庸明, 吉田 浩之, 清水 正毅
    • Organizer
      2021年日本液晶学会討論会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Standing Organic Nanowire Arrays Developed by Radiation-Induced Polymerization of Organic Molecules in Heavy Ion Tracks2021

    • Author(s)
      Tsuneaki Sakurai
    • Organizer
      2nd Research Coordination Meeting on "Enhancing the Beneficial Effects of Radiation Processing in Nanotechnology"
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Development of Emissive Solid Materials Applicable to Luminescent Solar Concentrators2021

    • Author(s)
      Masaki Shimizu, Rin Terao, Tsuneaki Sakurai, Hiroshi Sakaguchi
    • Organizer
      The 12th International Symposium of Advanced Energy Science ~Research Activities on Zero-Emission Energy Network~
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 高分子薄膜中で蛍光-りん光二重発光する1,2-ビス(アルコキシカルボニル)トリフェニレン2021

    • Author(s)
      寺尾 凛、櫻井 庸明、清水 正毅
    • Organizer
      日本化学会第101春季年会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 共役分子材料の配向制御とナノ構造化による機能開拓2021

    • Author(s)
      櫻井 庸明
    • Organizer
      京都工芸繊維大学 新素材イノベーションラボ 純正・応用化学セミナー
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] 励起状態分子内プロトン移動型発光体の液晶場における光物性2020

    • Author(s)
      櫻井 庸明
    • Organizer
      ACE Meeting Online II
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] ESIPT型有機発光体の設計と液晶場における光物性2020

    • Author(s)
      櫻井 庸明
    • Organizer
      2020年日本液晶学会オンライン研究発表会
    • Related Report
      2020 Annual Research Report
    • Invited

URL: 

Published: 2020-04-28   Modified: 2024-01-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi