TAKEDA Takashi

J-GLOBAL         Last updated: Oct 15, 2019 at 22:09
 
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Name
TAKEDA Takashi
Affiliation
National Institute for Materials Science

Research Areas

 
 

Published Papers

 
Takashi Takeda, Rong-Jun Xie, Takayuki Suehiro, Naoto Hirosaki
Progress in Solid State Chemistry   51 41-51   Sep 2018   [Refereed]
Si,Al containing nitride and oxynitride phosphors have been applied to white LEDs. Phosphors play important roles to produce high color rendering in lighting and wide color gamut in display. Si,Al containing nitrides and oxynitrides have been stud...
Peng Zheng, Shuxing Li, Le Wang, Tian-Liang Zhou, Shihai You, Takashi Takeda, Naoto Hirosaki, Rong-Jun Xie
ACS Applied Materials & Interfaces   10(17) 14930-14940   May 2018   [Refereed]
As a next-generation high-power lighting technology, laser lighting has attracted great attention in high-luminance applications. However, thermally robust and highly efficient color converters suitable for high-quality laser lighting are scarce. ...
Le Wang, Rong-Jun Xie, Takayuki Suehiro, Takashi Takeda, Naoto Hirosaki
Chemical Reviews   118(4) 1951-2009   Feb 2018   [Refereed]
Advances in solid state white lighting technologies witness the explosive development of phosphor materials (down-conversion luminescent materials). A large amount of evidence has demonstrated the revolutionary role of the emerging nitride phospho...
Jumpei Ueda, Setsuhisa Tanabe, Kohsei Takahashi, Takashi Takeda, Naoto Hirosaki
Bulletin of the Chemical Society of Japan   91(2) 173-177   Feb 2018   [Refereed]
CaAlSiN3:Eu2+ is a widely applied phosphor in white LEDs (w-LEDs) because of strong blue absorption and efficient red luminescence with high thermal quenching temperature. Thegood stability against thermal quenching has been well established, but ...
Shuxing Li, Le Wang, Daiming Tang, Yujin Cho, Xuejian Liu, Xingtai Zhou, Lu Lu, Lin Zhang, Takashi Takeda, Naoto Hirosaki, Rong-Jun Xie
Chemistry of Materials   30(2) 494-505   Jan 2018   [Refereed]
β-Sialon:Eu2+ has been reported to be the mostpromising narrow-band green phosphor for wide color gamut LCD backlights, but the coexistence of the Eu3+ luminescence killer with the Eu2+ luminescence center limits its luminescence performance to a ...

Books etc

 
単粒子診断法
武田 隆史
2016   
新蛍光体は様々な分野で常に求められている。母体物質に発光中心をドープする発光中心型では母体物質の選択が重要である。既知物質を蛍光体母体に用いた場合には、発光中心の種類、添加量、共添加、形態制御、固溶体合成、複合体合成など様々な方法が可能である。もうひとつの重要かつ有効な方法は新物質を蛍光体母体に使用することである。Eu2+やCe3+など発光に関与する電子軌道が空間的に広がっている発光中心の発光は配位環境の影響を受けやすく、発光波長、励起波長など発光特性は配位環境により大きく変化する。新物質...

Conference Activities & Talks

 
Crystal Structure and Emission Property of A12X13-type New Blue Oxynitride Phosphor
FUNAHASHI, Shiro, HIROSAKI, Naoto, TAKEDA, Takashi, XIE, Rong-Jun
第79回 応用物理学会秋季学術講演会   18 Sep 2018   
Structural Evolutions and Significantly Reduced Thermal Degradation of Red-Emitting Sr2Si5N8:Eu2+ via Carbon Doping
LIU, Lihong, Wang Le, Li yuanqiang, ZHANG, Chenning, CHO, Yujin, Or SiuWing , Zhou Tianliang, TAKEDA, Takashi, HIROSAKI, Naoto, Xie Rong-Jun
International Conference on Ceramic Materials and Components for   22 Jul 2018   
Sr2Si5N8:Eu2+ shows very promising photoluminescence properties but exhibits serious thermal degradation, thus making it difficult to be used pratically as a color converter in white light-emitting diodes (wLEDs). To alleviate this problem, we int...
Effect of Mn-doping on the properties of Mn, Mg-codopedγ-AlON green phosphor
CHO, Yujin, TAKEDA, Takashi, TAKAHASHI, Kohsei, KIMURA, Takashi, XIE, Rong-Jun, HIROSAKI, Naoto, SEKIGUCHI, Takashi
JSAP spring meeting 2018   17 Mar 2018   
Recently, narrow-band emitting phosphors attract particular attention for the application in white LED backlight in 8K-LCD TV, mobile phone, or tablet PCs.γ-AlON: Mg2+, Mn2+ is a promising candidate showing high color purity in green, small therma...
Luminescent Materials for Laser-Driven Solid State Lighting
XIE, Rong-Jun, LI, Shuxing, TAKEDA, Takashi, HIROSAKI, Naoto
3rd Intl. Conf. on MLand Novel Struct. Health Diagnosis   15 Dec 2017   
In this work, we reported the preparation and optical properties of luminescent ceramics for use in laser-driven solid state lighting, which include yellow-emitting YAG/Al2O3 and red-emitting CaAlSiN3:Eu2+ ceramics. These phosphor ceramics exhibit...
Nitride Phosphors and Their Applications
XIE, Rong-Jun, TAKEDA, Takashi, HIROSAKI, Naoto
第9回中国希土類発光材料学術シンポジウム及び国際フォーラム   30 Nov 2017   
In this invited presentation, we will overview the rare-earth doped nitride phosphors and their applications in white LEDs, laser lighting, and field emission displays.