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1997 Fiscal Year Final Research Report Summary

Crystal Growths and Physical Properties of Super-High Energy Sinchillator CeF_3 System Doped with Rare Earths

Research Project

Project/Area Number 08458120
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field エネルギー学一般・原子力学
Research InstitutionThe University of Electro-Communications

Principal Investigator

KAWANO Katsuyasu  Univ.Electro-Commun.Electronic Engineering, Professor, 電気通信学部, 教授 (90017418)

Project Period (FY) 1996 – 1997
KeywordsRare Earths / Scintillator / Crystal Growth / CeF_3 / ESR / Fluorites / Opt-magnetics
Research Abstract

This research project aims to grow super-high energy sinchillator CeF_3 system doped with rare earths and to investigate fundamentally physical properties of them. The CeF_3 is one of the most promising sinchillators in recent years. We prepared various probable inorganic crystals ; mixed crystals, rare earth doped crystals about CeF_3 and other related sinchillators. In first year, we purchased newly SIT (Electro-Static Induction Transister)-inverter for efficiently induction heating, and succeeded the growth of a very high-quality CsI and CsI : Eu crystals that was a measure of high-energy sinchillator crystal growth. In second year, we established measurement systems of optical detection of magnetic resonance, in which we purchased necessary magnetic resonance cavity attached with optical window and hand-made other optical and magnetic accessories. Irradiation testings were carried out for CeF_3, CsI,CsI : Eu, SrF_2 BaF_2 and their mixed crystals under gamma-ray of 10^6 to 10^8 rad in absorbed dose by ^<60>Co ray source in Tokyo Metropolitan Industrial Techniques Center where is located near our University. Anti-radiation abilities and identifications of generated color centers were investigated by optical and opt-magnetical procedures. For publication, we presented papers ; "Radiative to Non-radiative Processes for Luminescence of Eu^<2+> ion in SrF_2-BaF_2 Mixed Crystals", "lattice Mismatchings in SrF_2-BaF_2 Mixed Crystal Systems Monitored by Eu^<2+> Dopants", "Space Charge Relaxation and Clustering in Yttrium Doped BaF_2" and other related conference papers. A paper about luminescence spectra by X-ray excitation investigated on the Eu^<2+> ion doped into the fluorite-type Ca_<1-x>Sr_xF_2 and Sr_<1-x>Ba_xF_2 mixed crystal systems is submitted by a journal. We pulished also a few papers about high-conversion solar cells for applications of inorganic crystals doped with rare earths.

  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] K.Tanaka, Q.Zhuang, K.Tanaka, K.Kawano and R.Nakata:"“Studies on High Temperature Ionic Thermocurrents Observed in CaF_2 and CaF_2 : Eu"" J.Phys.& Chem.Solids. 57. 307-314 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Kawano and R.Nakata:"“X-ray Excitation Luminescence of the Eu Ion Doped into Fluorite-type CaF_2-SrF_2 and SrF_2-BaF_2 Mixed Crystal Systems"" Materials Science Forum. 239-241. 761-764 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Kawano, N.Hashimoto and R.Nakata:"“Effects on Solar Cell Efficiency of Fluorescence of Rare-Earth Ions"" Materials Science Forum. 239-241. 311-314 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Kawano, K.Arai, H.Yamada, N.Hashimoto and R.Nakata:"“Application of Rare Earth Complexes for Photovoltaic Precursors"" Solar Energy Materials & Solar Cells. 48. 35-41 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Kawano and R.Nakata:"“Lattice Mismatchings SrF_2-BaF_2 Mixed Crystal Systems Monitored by Eu^<2+> Dopants"" Proceedings of 1st Asia-Pacific EPR/ESR Symposium. 609-612 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Kawano, K.Katoh and R.Nakata:"“Radiative to Non-radiative Processes for Luminescence of Eu^<2+> ion in SrF_2-BaF_2 Mixed Crystals"" J.Phys.Soc.Japan. 66. 1803-1809 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] F.Uciyama, E.Ishikawa, K.Tanaka.K.Kawano and R.Nakata:"“Space Charge Relaxation and Clustering in Yttrium Doped BaF_2"" J.Phys.& Chem.Solids. 58. 2007-2015 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Kawano, T.Ohya, T.Tsurumi, K.Katoh and R.Nakata:"“X-ray excitation fluorescence studies of the Eu^<2+> ion-stabilized V_κ center in the alkaline earth fluoride mixed crystal systems"" Phys.Rev. B(to be submitted.). (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Tanaka, Q.Zhuang, K.Tanaka, K.Kawano and R.Nakata: "Studies on High Temperature Ionic Thermocurrents Observed in CaF_2 and CaF_2 : Eu" J.Phys.&Chem.Solids. 57. 307-314 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kawano and R.Nakata: "X-ray Excitation Luminescence of the Eu Ion Doped into Fluorite-type CaF_2-SrF_2 and SrF_2-BaF_2 Mixed Crystal Systems" Materials Science Forum. 239-241. 761-764 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kawano, N.Hashimoto and R.Nakata: "Effects on Solar Cell Efficiency of Fluorescence of Rare-Earth Ions" Materials Science Forum. 239-241. 311-314 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kawano, K.Arai, H.Yamada, N.Hashimoto and R.Nakata: "Application of Rare Earth Complexes for Photovoltaic Precursors" Solar Energy Mateials & Solar Cells. 48. 35-41 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kawano and R.Nakata: "Lattice Mismatchings in SrF_2-BaF_2 Mixed Crystal Systems Monitored by Eu^<2+> Dopants" Proceedings of 1st Asia-Pacific EPR/ESR Symposium. 609-612 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kawano, K.Katoh and R.Nakata: "Radiative to Non-radiative Processes for Luminescence of Eu^<2+> ion in SrF_2-BaF_2 Mixed Crystals" J.Phys.Soc.Japan. 66. 1803-1809 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] F.Uciyama, E.Ishikawa, K.Tanaka, K.Kawano and R.Nakata: "Space Charge Relaxation and Clustering in Yttrium Doped BaF_2" J.Phys.&Chem.Solids. 58. 2007-2015 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kawano, T.Ohya, T.Tsurumi, K.Katoh and R.Nakata: "X-ray excitation fluorescence studies of the Eu^<2+> ion-stabilized V_<KAPPA> center in th alkaline earth fluoride mixed crystal saystems" Phys.Rev, B. (to be submitted). (1998)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-16  

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