- Address
- 305-0044 茨城県つくば市並木1-1 [アクセス]
研究内容
- Keywords
optically functional inorganic materials (phosphors, photocatalysts, transparent ceramics)
出版物2004年以降のNIMS所属における研究成果や出版物を表示しています。
論文
- Xuejiao Wang, Ji-Guang Li, Maxim S. Molokeev, Qi Zhu, Xiaodong Li, Xudong Sun. Layered hydroxyl sulfate: Controlled crystallization, structure analysis, and green derivation of multi-color luminescent (La,RE) 2 O 2 SO 4 and (La,RE) 2 O 2 S phosphors (RE = Pr, Sm, Eu, Tb, and Dy). Chemical Engineering Journal. 302 (2016) 577-586 10.1016/j.cej.2016.05.089
- Ji-Guang Li, Yoshio Sakka. Recent progress in advanced optical materials based on gadolinium aluminate garnet (Gd3Al5O12). Science and Technology of Advanced Materials. 16 [1] (2015) 014902 10.1088/1468-6996/16/1/014902 Open Access
- Bin Lu, Ji-Guang Li, Tohru S. Suzuki, Mehdi Estili, Weigang Liu, Xudong Sun, Yoshio Sakka, J. Ballato. Controlled Synthesis of Layered Rare-Earth Hydroxide Nanosheets Leading to Highly Transparent (Y0.95 Eu0.05 )2 O3 Ceramics. Journal of the American Ceramic Society. 98 [5] (2015) 1413-1422 10.1111/jace.13488
書籍
- LI, Jiguang, SAKKA, Yoshio. Controlled Thermal Plasma Processing of Ceramic Nanopowders. HANDBOOK OF ADVANCED CERAMICS. , 2013, 979-989.
会議録
- Jing Li, Ji-Guang Li, Yoshio Sakka. Chemical Conversion Synthesis and Luminescence Properties of Hexagonal-NaYF4:Eu Nanorods. INTERNATIONAL JOURNAL OF MATERIALS SCIENCE AND ENGINEERING. (2013) 12-14 10.12720/ijmse.1.1.12-14
- Tian-Long Guo, Xudong Sun, Ji-Guang Li. Facile synthesis methods of Ag and Ru powder. INTERNATIONAL JOURNAL OF MATERIALS SCIENCE AND ENGINEERING. (2013) 8-11 10.12720/ijmse.1.1.8-11
- Ji-Guang Li. TiO2 Nanocrystals: Phase Selection and Morphology Control. INTERNATIONAl JOURNAL OF MATERIALS SCIENCE AND ENGINEERING. (2013) 5-7 10.12720/ijmse.1.1.5-7
口頭発表
- LI, Jiguang, Xuejiao Wang, MORITA, Koji. Low temperature sintering of (Gd,La)2O2S:Pr3+ ceramics through nanopowder synthesis. 日本セラミックス協会 第37回秋季シンポジウム. 2024
- 鈴木 達, 劉 麗紅, 李 継光, 森田 孝治, 金 炳男. SPSと結晶配向を用いた透光性YVO4セラミックスの作製. 日本セラミックス協会 第37回秋季シンポジウム. 2024
- LI, Jiguang, MORITA, Koji. NIR luminescence of (Gd,Ca)3(Hf,Sc,Al)5O12:Cr3+ phosphors. phosphor safari 2024 (The 13th International Symposium for Luminescent Materials). 2024 招待講演
その他の文献
- LI, Jiguang, Xiaodong Li, Xudong Sun, ISHIGAKI, Takamasa. TiO2 Nanocrystals: Phase Selective and Morphology Controllable Synthesis and their Enhanced Functionality via Doping. Nanomaterials: Properties, Preparation and Processes. (2010) 59-113
- IKEDA, Masashi, LI, Jiguang, Rubin, YE, KOBAYASHI, Norio, MORIYOSHI, Yusuke, ISHIGAKI, Takamasa. Size control of TiO2 nanoparticles through quench gas injections into RF induction thermal plasma . Symposium Proceedings, ISPC18. (2007) 1-4
- ISHIGAKI, Takamasa, LI, Jiguang. Synthesis of functional TiO2-based nanoparticles in RF induction thermal plasma. Symposium Proceedings, ISPC18. (2007) 1-3
所属学会
日本セラミックス協会
電子・光機能材料研究センター
Inorganic optical materials
Ceramic powders, liquid phase processing, Sintering, Transparent ceramics, Optical property
概要
Phosphors and transparent ceramics are optically functional materials that are finding wide applications in LED lighting, display, solid state lasers, and scintillation. The current advances in the above technological fields are imposing a strong need for new materials and fabrication technologies to achieve cost reduction and improved/novel optical properties.
新規性・独創性
• Through rational design of precursors and synthesis technologies, highly sinterable ceramics powders that can be fully densified at significantly reduced temperatures can be produced
• Through morphology control of the crystallites (size/shape/exposed facets), improved/novel luminescence properties can be attained
• Through polyhedron design of the activator ion and composition/structure design of the host lattice, high performance new phosphors can be expected
内容
The left-hand Figure shows multicolor emitting (Gd,Ln)3(Al,M1/M2)5O12:RE3+ phosphors, where Ln is a lanthanide element, M1 and M2 are 2+ and 4+ charged dopant ions, respectively, and RE3+ is an activator ion. The compounds were derived by modifying the Gd and Al sites of Gd3Al5O12 garnet (GAG), and such a strategy not only stabilized the metastable lattice of GAG but also produced multicolor luminescence by doping different types of activators.
The right-hand Figure shows the (Y,Gd)2O3:Eu3+ transparent ceramics, which were fabricated via vacuum sintering at only 1700 °C for 4 h but are as transparent as the corresponding single crystals. The oxide powders used for sintering were obtained by engineering of layered hydroxide nanosheets, including composition design and thickness control, followed by proper calcination. The derived oxide particles showed high dispersion, high specific surface area and unimodal size distribution, revealing the significant advantages of the synthesis technology.
まとめ
The ultimate goal of research is to develop advanced phosphors and transparent ceramics for application in the important fields of lighting/display, solid laser and scintillation (imaging), which is largely based on controllable processing of powders and rational design of chemical composition and crystal structure of the materials.
