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

• Project/Area Number: 15K04612
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Nanomaterials chemistry
• Research Institution: Keio University
• Principal Investigator: ISOBE Tetsuhiko 慶應義塾大学, 理工学部(矢上), 教授 (30212971)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000); Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2015: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• Keywords: 蛍光体 / ナノシート / 波長変換 / 太陽電池 / 波長変換膜

Outline of Final Research Achievements

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.

Research Products

• [Journal Article] Electrophoretically deposited Y2O3:Bi3+,Eu3+ nanosheet films with high transparency for near-ultraviolet to red light conversion (2018)
  • Author(s): Kosuge Yuta、Iso Yoshiki、Isobe Tetsuhiko
  • Journal Title: Langmuir Volume: 34 Issue: 13 Pages: 3813-3820
  • DOI: 10.1021/acs.langmuir.7b04334
  • Peer Reviewed
• [Journal Article] Synthesis of Y2O3:Bi3+,Eu3+ nanosheets from layered yttrium hydroxide precursor and their photoluminescence properties (2017)
  • Author(s): Tomotaka Watanabe, Yoshiki Iso, Tetsuhiko Isobe
  • Journal Title: RSC Advances Volume: 7 Issue: 23 Pages: 14107-14113
  • DOI: 10.1039/c7ra01114h
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] PVPコートY2O3:Bi3+,Eu3+ナノシート電気泳動堆積膜の作製・特性評価・太陽電池応用 (2018)
  • Author(s): 小菅 裕太、磯 由樹、磯部 徹彦
  • Organizer: 第56回セラミックス基礎科学討論会
• [Presentation] 電気泳動堆積法によるY2O3:Bi3+,Eu3+蛍光ナノシートの膜の作製と透光性の改善 (2017)
  • Author(s): 小菅 裕太，磯 由樹，磯部 徹彦
  • Organizer: 第64回応用物理学会春季学術講演会
  • Place of Presentation: パシフィコ横浜（神奈川県・横浜市）
  • Year and Date: 2017-03-14
• [Presentation] 希土類ドープ型Y2O3蛍光ナノシートの開発 (2017)
  • Author(s): 磯 由樹，磯部 徹彦
  • Organizer: 第366回蛍光体同学会講演会
  • Place of Presentation: 化学会館（東京都・千代田区）
  • Year and Date: 2017-02-17
  • Invited
• [Presentation] Synthesis and Characterization of Y2O3:Bi3+,Ln3+ (Ln = Eu, Yb) Fluorescent Nanosheets (2016)
  • Author(s): Yoshiki Iso, Takuya Matsunaga, Keisuke Fujita, Yuta Kosuge, Tetsuhiko Isobe
  • Organizer: Phosphor Safari 2016
  • Place of Presentation: Hong Kong (China)
  • Year and Date: 2016-11-28
  • Int'l Joint Research / Invited
• [Presentation] Fabrication of Y2O3:Bi3+,Eu3+ fluorescent nanosheet films by electrophoretic deposition (2016)
  • Author(s): Yuta Kosuge, Yoshiki Iso, Tetsuhiko Isobe
  • Organizer: Pacific Rim Meeting on Electrochemical and Solid-State Science 2016
  • Place of Presentation: Hawaii (USA)
  • Year and Date: 2016-10-02
  • Int'l Joint Research
• [Presentation] Near-UV → Red Down-shifting Y2O3:Bi3+,Eu3+ Nanosheets for Solar Cells (2016)
  • Author(s): Yoshiki Iso, Takuya Matsunaga, Yuta Kosuge, Tetsuhiko Isobe
  • Organizer: Materials Challenges in Alternative and Renewable Energy
  • Place of Presentation: Florida (USA)
  • Year and Date: 2016-04-17
  • Int'l Joint Research
• [Presentation] 電気泳動堆積法によるY2O3:Bi3+,Eu3+蛍光ナノシートの積層膜の作製 (2016)
  • Author(s): 小菅裕太, 磯由樹, 磯部徹彦
  • Organizer: 第63回応用物理学会春季学術講演会
  • Place of Presentation: 東京工業大学（東京都目黒区）
  • Year and Date: 2016-03-19
• [Presentation] 層状水酸化イットリウム前駆体を用いたY2O3:Bi3+,Eu3+ナノシートの作製と蛍光特性 (2015)
  • Author(s): 渡邉智貴, 松永拓也, 磯由樹, 磯部徹彦
  • Organizer: 第76回応用物理学会秋季学術講演会
  • Place of Presentation: 名古屋国際会議場（愛知県名古屋市）
  • Year and Date: 2015-09-13
• [Presentation] Synthesis of Y2O3:Bi3+,Eu3+ nanosheets from layered yttrium hydroxide precursor and their photoluminscent properties (2015)
  • Author(s): Tomotaka Watanabe, Takuya Matsunaga, Yoshiki Iso, Tetsuhiko Isobe
  • Organizer: International Symposium on Phosphor Materials 2015 (Phosphor Safari 2015)
  • Place of Presentation: メディアシップ（新潟県新潟市）
  • Year and Date: 2015-07-27
  • Int'l Joint Research
• [Remarks] http://www.applc.keio.ac.jp/~isobe/
• [Remarks] 慶應義塾大学 理工学部 応用化学科 機能材料デザイン研究室
  • URL: http://www.applc.keio.ac.jp/~isobe/