Satoko Fujioka
Keio University
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Publication
Featured researches published by Satoko Fujioka.
Optics Letters | 2011
Naohiro Ishiwada; Satoko Fujioka; Toshihisa Ueda; Takeshi Yokomori
In this study, the new temperature-dependent phosphor, Y2O3:Tb3+/Tm3+, was investigated for high-temperature thermometry. The photoluminescence intensity at 456 nm emitted from Tm3+ was strong at temperatures higher than 1100 K, whereas the peak intensities emitted from Tb3+ decreased due to the thermal quenching effect. Thus, the intensity ratio between those emissions showed an appropriate variation for thermometry over a wide temperature range. In addition, the phosphors showed a distinct change of visible emission colors from green to blue with increasing temperature. These findings suggest the applicability of these phosphors in visual thermo-sensors.
ASME/JSME 2011 8th Thermal Engineering Joint Conference, AJTEC 2011 | 2011
Naohiro Ishiwada; Satoko Fujioka; Toshihisa Ueda; Takeshi Yokomori
The development of new temperature-dependent phosphor particles for high temperature thermometry is presented. To develop the phosphor material that can be applied to the intensity ratio method, the photoluminescence of Y2 O3 :Tb,Tm was investigated with elevating temperature. As a result, Y2 O3 :Tb,Tm phosphor shows that the peak intensity at 456 nm is still strong at more than 1100 K whereas the other peak intensities decrease due to the thermal quenching. Thus, the intensity ratio I543nm /I456nm has a high gradient and linearity over a wide temperature range, and it is confirmed that Y2 O3 :Tb,Tm provides a higher resolution in temperature measurement than Y2 O3 :Tb and Y2 O3 :Tm. Also, since this phosphor changes its emission color from green to blue with increasing temperature, it is possible to measure temperature not only by analyzing the intensity ratio but also by observing the color change in appearance. It can, therefore, be expected to use as a Visual Thermo-Sensor (VTS).Copyright
Chemical Engineering Science | 2011
Koichi Terasaka; Ai Hirabayashi; Takanori Nishino; Satoko Fujioka; Daisuke Kobayashi
Chemical Engineering Science | 2013
Yugo Kanai; Ken ichiro Fukunaga; Koichi Terasaka; Satoko Fujioka
Aiche Journal | 2016
Toshinori Shimanouchi; Yoshitaka Kataoka; Tatsuya Tanifuji; Yukitaka Kimura; Satoko Fujioka; Koichi Terasaka
Journal of Chemical Engineering of Japan | 2012
Yugo Kanai; Koichi Terasaka; Masato Suwabe; Satoko Fujioka; Daisuke Kobayashi
Journal of Chemical Engineering of Japan | 2011
Koichi Terasaka; Yoshihito Sasada; Daisuke Kobayashi; Satoko Fujioka
Solvent Extraction Research and Development-japan | 2014
Toshinori Shimanouchi; Tatsuya Tanifuji; Satoko Fujioka; Koichi Terasaka; Yukitaka Kimura
Journal of Chemical Engineering of Japan | 2013
Koichi Terasaka; Junya Nitta; Hisashi Fukuda; Misa Iwahashi; Takashi Goshima; Satoko Fujioka
Kagaku Kogaku Ronbunshu | 2009
Sunho You; Naotaka Higuchi; Satoko Fujioka; Toshihisa Ueda