TY - JOUR
T1 - Luminescent properties of Cr-doped gallium garnet crystals grown by the micro-pulling-down method
AU - Kurosawa, Shunsuke
AU - Suzuki, Akira
AU - Yamaji, Akihiro
AU - Kamada, Kei
AU - Pejchal, Jan
AU - Ohashi, Yuji
AU - Yokota, Yuui
AU - Chani, Valery Ivanovich
AU - Yoshikawa, Akira
N1 - Funding Information:
This work was partially supported by (i) Japan Society for the Promotion of Science (JSPS), KAKENHI Grant nos. 14462961, 15597934, 15619740 (Grant-in-Aid for Young Scientists(B), S. Kurosawa), (ii) Bilateral ASCR-JSPS Joint Research Project, (iii) Japan Science and Technology Agency (JST), Development of Systems and Technology for Advanced Measurement and Analysis (SENTAN), (iv) JST, Adaptable & Seamless Technology Transfer Program through Target-driven R&D, (v) the Association for the Progress of New Chemical Technology, (vi) The Murata Science Foundation, (vii) Nippon Sheet Glass Foundation for Materials Science and Engineering, (viii) Tonen General Sekiyu Foundation, (ix) Yazaki Memorial Foundation for Science and Technology, (x) Tokin Science and Technology Promotion Foundation, (xi) Intelligent Cosmos Research Institute, and (xii) Frontier Research Institute for Interdisciplinary Sciences, Tohoku University. In addition, we would like to thank following persons for their support: Mr. Yoshihiro Nakamura of Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University and Mr. Hiroshi Uemura, Ms. Keiko Toguchi, Ms. Megumi Sasaki, Ms. Yuka Takeda and Ms. Kuniko Kawaguchi of IMR, Tohoku University.
Funding Information:
This work was partially supported by (i) Japan Society for the Promotion of Science (JSPS), KAKENHI Grant nos. 14462961 , 15597934 , 15619740 (Grant-in-Aid for Young Scientists(B), S. Kurosawa), (ii) Bilateral ASCR-JSPS Joint Research Project, (iii) Japan Science and Technology Agency (JST) , Development of Systems and Technology for Advanced Measurement and Analysis (SENTAN), (iv) JST , Adaptable & Seamless Technology Transfer Program through Target-driven R&D, (v) the Association for the Progress of New Chemical Technology , (vi) The Murata Science Foundation , (vii) Nippon Sheet Glass Foundation for Materials Science and Engineering , (viii) Tonen General Sekiyu Foundation , (ix) Yazaki Memorial Foundation for Science and Technology , (x) Tokin Science and Technology Promotion Foundation , (xi) Intelligent Cosmos Research Institute , and (xii) Frontier Research Institute for Interdisciplinary Sciences, Tohoku University . In addition, we would like to thank following persons for their support: Mr. Yoshihiro Nakamura of Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University and Mr. Hiroshi Uemura, Ms. Keiko Toguchi, Ms. Megumi Sasaki, Ms. Yuka Takeda and Ms. Kuniko Kawaguchi of IMR, Tohoku University.
Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2016/10/15
Y1 - 2016/10/15
N2 - Cr-doped (GdxY1−x)3Ga5O12 crystals (x=0.00, 0.25, 0.50, 0.75 and 1.00) were grown by the micro-pulling-down method and examined for their possible application as red and infrared scintillating detectors in medical field. Although Cr:(Gd0.75Y0.25)3Ga5O12 and Cr:Gd3Ga5O12 had similar X-ray diffraction patterns, other samples showed some change in lattice constant. All the crystals had broad emission bands in the red and infrared region when excited by either 450 nm photons or X rays. These bands were associated with 4T2→A2 transitions. Moreover, redshift of the emission-peak wavelengths (4T2→4A2) and absorption peaks (4A2→4T1 and 4T2) was observed with increase of Gd content (x) in Cr-doped (GdxY1−x)3Ga5O12 due to the change of the crystal fields. The crystals had scintillation emissions in the wavelength region suitable for the real time dose monitoring in radiation therapy.
AB - Cr-doped (GdxY1−x)3Ga5O12 crystals (x=0.00, 0.25, 0.50, 0.75 and 1.00) were grown by the micro-pulling-down method and examined for their possible application as red and infrared scintillating detectors in medical field. Although Cr:(Gd0.75Y0.25)3Ga5O12 and Cr:Gd3Ga5O12 had similar X-ray diffraction patterns, other samples showed some change in lattice constant. All the crystals had broad emission bands in the red and infrared region when excited by either 450 nm photons or X rays. These bands were associated with 4T2→A2 transitions. Moreover, redshift of the emission-peak wavelengths (4T2→4A2) and absorption peaks (4A2→4T1 and 4T2) was observed with increase of Gd content (x) in Cr-doped (GdxY1−x)3Ga5O12 due to the change of the crystal fields. The crystals had scintillation emissions in the wavelength region suitable for the real time dose monitoring in radiation therapy.
KW - A2: Single crystal growth
KW - B1: Gallium compounds
KW - B2: Scintillator materials
KW - B3: Scintillators
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U2 - 10.1016/j.jcrysgro.2016.02.004
DO - 10.1016/j.jcrysgro.2016.02.004
M3 - Article
AN - SCOPUS:84958559278
SN - 0022-0248
VL - 452
SP - 95
EP - 100
JO - Journal of Crystal Growth
JF - Journal of Crystal Growth
ER -