Isobe, Tetsuhiko

写真a

Affiliation

Faculty of Science and Technology, Department of Applied Chemistry ( Yagami )

Position

Professor

Related Websites

External Links
Scopus Paper Info  
Paper Count: 204 Citation Count: 5188 h-index: 38

Click to view the Scopus page. The data was downloaded from Scopus API in March 01, 2026, via http://api.elsevier.com and http://www.scopus.com .

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Profile Summary 【 Display / hide 】

  • 私たちの研究室では、ユニークな液相合成法を活用して０次元や２次元の形態を有するナノ蛍光体材料を開発しています。たとえば、ディスプレイの広色域化を可能にするペロブスカイト量子ドット、太陽電池応用を指向した近紫外線を赤色や近赤外線に波長変換するナノシート、低毒性・環境親和性を有するカーボンドット、近紫外線照射で可視光を発する銀イオン交換ゼオライトナノ粒子などを研究しています。

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Career 【 Display / hide 】

  • 1989.04
    -
    1995.03

    Keio University, Assistant

  • 1993.09
    -
    1994.08

    Vanderbilt University (USA), Visiting scholar

  • 1995.04
    -
    1999.03

    Keio University, Assistant Professor

  • 1999.04
    -
    2007.03

    Keio University, Associate Professor

  • 1999.09
    -
    2000.08

    École Supérieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI)(France), Visiting scholar

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Academic Background 【 Display / hide 】

  • 1986.03

    Keio University, 理工学部, 応用化学科

    University, Graduated

  • 1988.03

    Keio University, 理工学研究科, 応用化学専攻

    Graduate School, Completed, Master's course

  • 1991.03

    Keio University, 理工学研究科, 応用化学専攻

    Graduate School, Withdrawal after completion of doctoral course requirements, Doctoral course

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Academic Degrees 【 Display / hide 】

  • 博士（工学）, Keio University, Coursework, 1992.02

    微粒子固体の競合反応特性に及ぼす製造履歴と微細構造の影響

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Research Areas 【 Display / hide 】

  • Nanotechnology/Materials / Inorganic materials and properties

  • Nanotechnology/Materials / Nanobioscience (Nano Materials/Nano Bioscience)

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Research Keywords 【 Display / hide 】

  • Phosphors

  • Nanophosphor

  • Quantum dots

  • Luminescent nanomaterials

  • Nanocomposite materials

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Books 【 Display / hide 】

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Papers 【 Display / hide 】

  • Performance enhancement of carbon dot-based luminescent solar concentrators <i>via</i> surface modification and TiO<sub>2</sub>-enhanced scattering

    Liu, YX; Iso, Y; Isobe, T

    JOURNAL OF MATERIALS CHEMISTRY C 14 ( 7 ) 2936 - 2947 2026.02

    Research paper (scientific journal), Joint Work, Accepted,  ISSN  2050-7526

  • Core-Size-Controlled and Ligand-Modified CuInS<sub>2</sub>/ZnS Quantum Dots for Enhancing the Red Photoluminescence Quantum Yield and Metal Ion Sensing in an Aqueous Solution

    Tan, HW; Iso, Y; Isobe, T

    ACS APPLIED OPTICAL MATERIALS  2026.02

    Research paper (scientific journal), Joint Work, Accepted,  ISSN  2771-9855

  • Sol-Gel Preparation of Transparent and Monolithic Nanocomposites with Fluorescent CuInS<sub>2</sub>/ZnS Quantum Dots in Silica and for Luminescent Solar Concentrators

    Yano, S; Iso, Y; Isobe, T

    ACS APPLIED NANO MATERIALS 9 ( 1 ) 543 - 550 2026.01

    Research paper (scientific journal), Joint Work, Accepted

  • Fabrication of CuInS<inf>2</inf>/ZnS quantum dot nanocomposite films and investigation of their influence on performance of soda glass-based luminescent solar concentrators

    Yu Imakiire, Yoshiki Iso, Tetsuhiko Isobe

    Journal of Materials Chemistry C (Royal Society of Chemistry)  13 ( 8 ) 4078 - 4088 2025.02

    Research paper (scientific journal), Joint Work, Accepted,  ISSN  20507526

    　View Summary

    The power generation performance of luminescent solar concentrators (LSCs) is decreased by unignorable optical losses including self-absorption of luminescence by the phosphor and optical absorption by the light guide plate. To address the optical loss due to self-absorption, this research focused on the use of core/shell CuInS2 (CIS)/ZnS quantum dots (QDs) with a large Stokes shift. The QDs were dispersed in ethylene-vinyl acetate (EVA) copolymer to fabricate transparent fluorescent nanocomposite films. LSCs were prepared with the nanocomposite films and soda glass plate, a common building material to investigate the effect of optical absorption by the light guide plate on the power generation performance. Synthesized QDs showed yellow emission at 587 nm with a high photoluminescence quantum yield (PLQY) of 61.1%, and their large Stokes shift of 0.82 eV reduced self-absorption, making them suitable for LSC applications. We evaluated the effects of QD concentration, film thickness, light guide plate material, and film position on the performance of the LSCs. Optimized performance was observed at a QD concentration of 6.2 wt% and film thickness of 324 μm, showing 1.71-fold higher photocurrent and 3.58-fold larger area of incident photon-to-current efficiency spectrum compared to without film. Replacing soda glass with low-absorption white glass increased power generation by fourfold. This reveals the significant absorption losses of the PL and scattered incident light by soda glass. Despite the considerable optical loss, soda glass is a necessary component in a light guide plate to promote the use of LSCs as building materials. Our findings indicate that QDs with a narrow emission peak at ∼520 nm are required to minimize the absorption loss by soda glass.

  • Greenish yellow-emitting carbon dot-based films for luminescent solar concentrator applications

    Yunxiang Liu, Yoshiki Iso, Tetsuhiko Isobe

    Journal of Materials Chemistry C (Royal Society of Chemistry)  13 ( 2 ) 786 - 792 2025.01

    Research paper (scientific journal), Joint Work, Accepted,  ISSN  20507526

    　View Summary

    Currently, most carbon dots (CDs) are synthesized from carbon-based materials in autoclaves with high pressure, and then applied in various fields. This work explored the facile synthesis of CDs at atmospheric pressure, which were then purified and embedded in the ethylene-vinyl acetate (EVA) copolymer to form CDs@EVA films and applied in luminescent solar concentrator (LSC) devices. First, crude CDs were synthesized by refluxing p-phenylenediamine (p-PD) in diphenyl ether at 250 °C for 2 h under ambient air conditions, followed by purification using silica gel column chromatography to obtain purified CDs with a photoluminescence (PL) quantum yield of 56% and an average particle size of 15.1 ± 4.4 nm. The CDs@EVA films were fabricated at CD concentrations of 0.05 wt%, 0.10 wt%, and 0.15 wt%, and their thickness was varied from ∼100 μm to ∼500 μm. The yellowish-transparent CDs@EVA films exhibited greenish-yellow emission with absorption peaks at 350 nm and 470 nm, corresponding to the n-π* transition of C=N bonds and the π-π* transition between the highest occupied molecular orbital and the lowest unoccupied molecular orbital of π-conjugated electrons. The PL intensity reached its maximum at 0.05 wt% CD concentration and 408 μm thickness due to self-absorption of emission from CDs. According to the current-voltage curve measurements under AM1.5G simulated sunlight, this film exhibited the maximum short-circuit current (Isc) and power conversion efficiency (η) of the LSC device. Additionally, incident photon-to-current efficiency spectrum measurements revealed that the enhanced Isc and η in CDs@EVA films mainly resulted from emission by absorption through the n-π* and π-π* transitions.

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Papers, etc., Registered in KOARA 【 Display / hide 】

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Reviews, Commentaries, etc. 【 Display / hide 】

  • カーボン量子ドット蛍光体の簡便な液相合成法とセンシング応用

    磯部　徹彦，磯　由樹

    次世代センサJournal (次世代センサ協議会)  35 ( 1 ) 2 - 7 2026.01

    Article, review, commentary, editorial, etc. (scientific journal), Joint Work,  ISSN  2188-496X

  • ハロゲン化セシウム鉛量子ドットの魅力的な蛍光特性と波長変換による太陽電池応用

    磯　由樹，磯部　徹彦

    Journal of the Society of Inorganic Materials, Japan (無機マテリアル学会)  31 ( 433 ) 317 - 323 2024.11

    Article, review, commentary, editorial, etc. (scientific journal), Joint Work,  ISSN  2185-4378

  • 開放反応場における狭帯域蛍光カーボン量子ドットの液相合成法の開拓

    磯　由樹，磯部　徹彦

    科学と工業 (大阪工研協会)  98 ( 7 ) 175 - 181 2024.07

    Article, review, commentary, editorial, etc. (scientific journal), Joint Work,  ISSN  0368-5918

  • 発光材料として注目されるハロゲン化物ペロブスカイトナノ結晶

    磯　由樹，磯部　徹彦

    マテリアルステージ (技術情報協会)  23 ( 4 ) 26 - 30 2023.07

    Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media), Joint Work,  ISSN  13463926

  • 単結晶シリコン太陽電池の波長変換材料を目指した量子ドットの開発

    磯　由樹，磯部　徹彦

    機能材料 (シーエムシー出版)  41 ( 4 ) 19 - 27 2021.04

    Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media), Joint Work,  ISSN  0286-4835

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Presentations 【 Display / hide 】

  • 量子ドット蛍光体開発の現状と展望

    磯　由樹，磯部　徹彦

    [Domestic presentation]  第72回応用物理学会春季学術講演会 (東京理科大学野田キャンパス，野田) , 

    2025.03
    , 

    Oral presentation (invited, special)

  • Investigation of Luminescent Solar Concentrator using Fluorescent Quantum Dot with a Large Stokes Shift

    Yoshiki Iso, Tetsuhiko Isobe

    [International presentation]  The 31st International Display Workshops (IDW'24) (Sapporo, Japan) , 

    2024.12
    , 

    Oral presentation (invited, special)

  • 広帯域励起・狭帯域赤色蛍光カーボンドットの液相合成

    丸山　蒼生，磯　由樹，磯部　徹彦

    [Domestic presentation]  第51回炭素材料学会年会 (九州大学筑紫キャンパス，福岡) , 

    2024.11
    , 

    Poster presentation

  • 0次元の変身ショー：カーボン量子ドット

    磯　由樹，磯部　徹彦

    [Domestic presentation]  第14回CSJ化学フェスタ2024 (タワーホール船堀，東京) , 

    2024.10
    , 

    Oral presentation (invited, special)

  • CuInS2/ZnS量子ドットを用いた発光型太陽光集光装置の発電特性に対する導光板材質の影響

    今給黎　祐，磯　由樹，磯部　徹彦

    [Domestic presentation]  第14回CSJ化学フェスタ2024 (タワーホール船堀，東京) , 

    2024.10
    , 

    Poster presentation

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Research Projects of Competitive Funds, etc. 【 Display / hide 】

  • Pioneering Liquid Phase Synthesis of Innovative Carbon Quantum Dot Fluorescent Materials

    2024.04
    -
    2027.03

    Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Research grant, Principal investigator

    　View Summary

    蛍光ピークが単一であり、蛍光ピーク幅が狭く、蛍光ピーク波長が調節可能である蛍光特性を持ち合わせた、環境負荷の少ない炭素を主成分とするカーボン量子ドット（CQD）蛍光材料を作製することを追究する。研究代表者のグループのこれまでの無機化合物量子ドットの液相合成での知見と技術を活かして、高沸点の非水溶媒を使用し、電子供与性官能基をもつ炭素原料分子をビルディングブロックとして組み立てる液相合成法を構築する。sp2ドメインを形成し、HOMO－LUMO間のπ電子遷移により励起・蛍光を起こさせ、周囲環境の極性により励起・蛍光エネルギーを制御できる革新的CQD蛍光材料を開拓する。

  • Development of advanced liquid-phase synthesis of carbon dots with controlled photoluminescence properties

    2019.06
    -
    2022.03

    Keio University, Grants-in-Aid for Scientific Research, Isobe Tetsuhiko, Challenging Research (Exploratory), Research grant, Principal investigator

    　View Summary

    Recently, quantum dots (QDs), which emit light in the band gap and whose emission color can be tuned by controlling particle size through the quantum size effect, have emerged. CdSe, InP, and CsPbBr3 have been developed as QD materials; however, they have problems in terms of toxicity and stability. Against this background, light-emitting materials with high environmental friendliness are required; therefore, we focused on the preparation of luminescent carbon dots (CDs) from abundant carbon sources. In this work, we pioneered an advanced liquid-phase method to synthesize CDs by polymerizing aromatic compound materials in non-aqueous solvents. Furthermore, the effects of surface modification and surrounding environment on the luminescence properties were investigated to control them.

  • Improvement of properties of solar cells by quantum dots with the function of UV - visible wavelength conversion

    2018.04
    -
    2021.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, ISOBE Tetsuhiko, Grant-in-Aid for Scientific Research (B), Research grant, Principal investigator

    　View Summary

    An ultraviolet light absorber is used in a photovoltaic module to protect its parts from ultraviolet light. As a result, in photovoltaic modules, the spectral sensitivity of wavelengths below 400 nm is reduced. If a phosphor converting ultraviolet light into visible light is used instead of the ultraviolet light absorber, it is possible to protect the photovoltaic module from ultraviolet light and at the same time to improve the spectral sensitivity of the photovoltaic module in ultraviolet range. In this research, we have developed core / shell type CuInS2/ZnS and CuGaS2/ZnS quantum dot phosphors that convert ultraviolet light to visible light and have high transparency to visible light with high spectral sensitivity of photovoltaic modules. We investigated the improvement of photoelectric conversion efficiency of the photovoltaic module by wavelength conversion of these quantum dots.

  • Preparation, characterization, and application of near-UV -> red conversion fluorescent nanosheets and their composite films

    2015.04
    -
    2018.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, ISOBE Tetsuhiko, Grant-in-Aid for Scientific Research (C), Research grant, Principal investigator

    　View Summary

    Y2O3:Bi3+,Eu3+ nanosheets, which emit red light under near-UV irradiation, were obtained by calcining hydroxide precursor nanosheets synthesized through a hydrothermal method. An aqueous dispersion of positively charged Y2O3:Bi3+,Eu3+ nanosheets with polyethyleneimine adsorbed to the surface was prepared for their deposition. Fluorescent nanosheets were electrophoretically deposited on a transparent conductive substrate under a constant voltage. Next, polyvinylpyrrolidone was coated on the film. The effects of the PVP-coated film samples on the properties of a commercial monocrystalline silicon photovoltaic module were evaluated.

  • Preparation and characterization of biocompatible composite beads with fluorescent nanoparticles

    2011.04
    -
    2014.03

    Keio University, ISOBE Tetsuhiko, Grant-in-Aid for Scientific Research (B), Research grant, Principal investigator

    　View Summary

    Preparation of chitosan beads by cross-linking method through electrostatic interaction with tripolyphosphate ions, combined with emulsification method using SPG membrane was studied. Next, hybridizations between green-emitting YAG:Ce3+ nanoparticles and chitosan beads, and between red-emitting Eu3+-doped apatite nanoparticles and chitosan beads were studied. Hybridizations between Eu3+-doped apatite nanoparticles and silica beads, and between YAG:Ce3+ nanoparticles and alginate beads were also studied.

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Works 【 Display / hide 】

  • サイエンス&テクノロジーセミナー「カドミウムフリー量子ドット（QDs）の基礎と最新技術動向および発光特性・安定性の向上技術～インジウム系・多元系・ペロブスカイト系・カーボン系量子ドットの開発動向～」

    磯部　徹彦

    オンライン, 

    2024.09
    , 

    Other, Single

  • AndTech【LIVE配信・WEBセミナー】「蛍光体開発の最前線～白色LEDの高出力化、量子ドット蛍光体の安定性の改善策～」

    磯部　徹彦

    オンライン, 

    2024.08
    , 

    Other, Single

  • 技術情報協会Live配信セミナー「～２０２３年「ノーベル化学賞」受賞テーマ～「量子ドット(ＱＤ)」の設計，カドミウムフリー化，応用，今後の展望」：「量子ドット蛍光体の基礎・分散性・安定性」

    磯部　徹彦

    オンライン, 

    2024.03
    , 

    Other, Single

  • 早慶交換講義「無機ナノ蛍光体の研究開発への挑戦」

    ISOBE TETSUHIKO

    2013.04
    , 

    Other, Single

  • 慶應義塾大学メディアセンターMediaNet, No.18, p.25, ティールーム「電子化でちょっと気になること」

    ISOBE TETSUHIKO

    2011.11
    , 

    Other, Single

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Intellectual Property Rights, etc. 【 Display / hide 】

  • 発光体の製造方法

    Date applied： 特願平9-212171  1997.08 

    Date announced： 特開平10-310770  1998.11 

    Patent

  • 発光体の製造方法

    Date applied： 特願平10-273596  1998.09 

    Date announced： 特開2000-104058  2000.04 

    Patent

  • ハイドロキシアパタイトの合成方法，ハイドロキシアパタイト複合体およびその製造方法

    Date applied： 特願2000-607922  1999.03 

    Date announced： WO00/58209  2000.10 

    Patent

  • リン酸カルシウム粉体の製造方法

    Date applied： 特願2000-607923  1999.03 

    Date announced： WO00/58210  2000.10 

    Patent

  • はんだ粉末とその製造方法、およびソルダーペースト

    Date applied： 特願平11-187637  1999.07 

    Date announced： 特開2000-317682  2000.11 

    Patent

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Awards 【 Display / hide 】

  • Outstanding Poster Paper Award

    T. Watanabe, Y. Iso, T. Isobe, H. Sasaki, 2017.12, The 24th International Display Workshops（IDW'17), Improved Photostability of Tetramethyl Orthosilicate-Modified InP/ZnS Quantum Dots

    Type of Award： Award from international society, conference, symposium, etc.

  • The Poster Award

    Kenji Akisada, Yusuke Noguchi, Tetsuhiko Isobe, 2010.11, The 3rd International Congress on Ceramics (ICC3) Symposim 5 "Hybrid and Nano-Structured Materials", Preparation of composite PMMA microbeads hybridized with fluorescent YVO4:Bi3+,Eu3+

    Type of Award： Award from international society, conference, symposium, etc.

  • Best Paper Award

    Wakana Kichikawa, Fumiaki Nishimura, Tetsuhiko Isobe, 2006.09, The International Union Materials Research Society － International Conference in Asia 2006　（IUMRS－ICA　2006）, Photoluminescence of the Highly Transparent Colloidal Solution of LaPO4:Ce3+, Tb3+ Nanocrystal Phosphors Synthesized by Low-Temperature Solvothermal Method : Effect of Polyphosphate Additive

    Type of Award： Award from international society, conference, symposium, etc.

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Courses Taught 【 Display / hide 】

  • SEMINAR IN APPLIED CHEMISTRY

    2025

  • NANO SCALE SCIENCE JOINT SEMINAR

    2025

  • MATERIAL DESIGN SCIENCE JOINT SEMINAR

    2025

  • LABORATORIES IN APPLIED CHEMISTRY A

    2025

  • INTRODUCTION OF MATERIAL DESIGN 2

    2025

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Courses Previously Taught 【 Display / hide 】

  • 無機化学基礎

    慶應義塾大学

    2018.04
    -
    2019.03

  • 固体の機能設計

    慶應義塾大学大学院

    2018.04
    -
    2019.03

  • 機能デザイン工学

    慶應義塾大学大学院

    2018.04
    -
    2019.03

  • 総合デザイン工学特別研究第１

    慶應義塾大学大学院

    2018.04
    -
    2019.03

  • 総合デザイン工学課題研究

    慶應義塾大学大学院

    2018.04
    -
    2019.03

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Memberships in Academic Societies 【 Display / hide 】

  • 電気化学会 蛍光体研究懇談会（蛍光体同学会）, 

    2001.01
    -
    Present

  • 応用物理学会, 

    1996.02
    -
    Present

  • 電気化学会, 

    2011.01
    -
    Present

  • 日本セラミックス協会, 

    2011.04
    -
    Present

  • Electrochemical Society, 

    2008.10
    -
    Present

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Committee Experiences 【 Display / hide 】

  • 2022.01
    -
    Present

    会長, 電気化学会 蛍光体研究懇談会（蛍光体同学会）

  • 2007.01
    -
    Present

    幹事, 電気化学会 蛍光体研究懇談会（蛍光体同学会）

  • 2014.04
    -
    2026.03

    代議員, 電気化学会

  • 2017.10
    -
    Present

    Luminescence and Display Materials Division, Executive Committee Member-at-Large, Electrochemical Society

  • 2004.06
    -
    2023.12

    委員, 日本学術振興会　光電相互変換第125委員会

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