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Development of new scintillator materials based on 5d-4f luminescence of Pr^<3+>

Research Project

Project/Area Number 19750168
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeSingle-year Grants
Research Field Inorganic industrial materials
Research InstitutionThe University of Tokyo

Principal Investigator

OGINO Hiraku  The University of Tokyo, 大学院・工学系研究科, 助教 (70359545)

Project Period (FY) 2007 – 2008
Project Status Completed (Fiscal Year 2008)
Budget Amount *help
¥2,800,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥300,000)
Fiscal Year 2008: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2007: ¥1,500,000 (Direct Cost: ¥1,500,000)
Keywordsシンチレータ / 融液成長 / 点欠陥 / 単結晶 / 希土類
Research Abstract

ガンマ線等の高エネルギー粒子検出用には主に単結晶シンチレータが用いられているが、様々な材料系において、酸素欠損やアンチサイト欠陥など、結晶に内在する点欠陥が欠陥準位を形成し、発光量の減少、蛍光寿命の長寿命化などシンチレーション特性に悪影響を与えていることが報告されている。LU_3Al_5O_<12> (LuAG)系シンチレータでは、単結晶を融液成長法で作製した場合Alサイトの一部がREで置換されるアンチサイト欠陥が形成され、これが原因となってLuAG系シンチレータでは、数10nsの寿命を持つ主成分の発光とは別に、μs〜msオーダーの長寿命発光がかなりの割合で生じることが報告されている。微量元素の添加による欠陥密度低減などの試みは行われているものの、これら結晶中に存在する点欠陥とそれに影響された物性は、その材料系本来の特性と考えられて来た。本研究では、融液成長で作製されたガーネット系単結晶において、固有の問題と考えられてきたアンチサイト欠陥と発光の長寿命成分について、ホストの化学組成を変化させることにより制御を試みた。 LuAG結晶のAlサイトをGaで置換した試料を作製・評価した。10%程度のGa置換によりホスト発光の消失、蛍光寿命の短寿命化・バックグラウンド成分の低減が見られた。この変化は欠陥準位中の電子の輻射再結合に由来する長寿命成分の低下を示しているが、Pr:LuAGの熱励起ルミネッセンス測定結果などから、これはGa置換により欠陥準位が浅くなり、室温領域における欠陥準位の寄与が低下したためと考えられる。今後Ga置換量の最適化や結晶作製条件の改良などによりさらに高い特性も期待できる。

Report

(3 results)
  • 2008 Annual Research Report   Final Research Report ( PDF )
  • 2007 Annual Research Report
  • Research Products

    (22 results)

All 2009 2008 2007

All Journal Article (12 results) (of which Peer Reviewed: 5 results) Presentation (10 results)

  • [Journal Article] Crystal growth and scintillation properties of YAlO_3:Pr co-doped with trivalent ions2009

    • Author(s)
      M. Zhuravleva, M. Nikl, J. Pejchal, H. Ogino, A. Yoshikawa
    • Journal Title

      J. Cryst. Growth 311

      Pages: 537-540

    • Related Report
      2008 Final Research Report
  • [Journal Article] Growth and optical properties of Lu_3(Ga,Al)_5O_<12> single crystals for scintillator application2009

    • Author(s)
      H. Ogino, A. Yoshikawa, J. A. Mares, M. Nikl, J. Shimoyama, K. Kishio
    • Journal Title

      J. Cryst. Growth 311

      Pages: 908-911

    • Related Report
      2008 Final Research Report
  • [Journal Article] Suppression of host luminescence in the Pr:LuAG scintillator2008

    • Author(s)
      H. Ogino, K. Kamada, A. Yoshikawa, F. Saito, J. Pejchal, J.A. Mares, M. Nikl, A. Vedda, J. Shimoyama, K. Kishio
    • Journal Title

      IEEE: Trans. Nucl. Sci. 55

      Pages: 1197-1200

    • Related Report
      2008 Final Research Report
  • [Journal Article] Energy transfer to Pr^<3+> ions in Pr:Lu_3Al_5O_<12> (LuAG) single crystals2008

    • Author(s)
      A. Yoshikawa, K. Kamada, F. Saito, H. Ogino, M. Itoh, T. Katagiri, D. Iri, M. Fujita
    • Journal Title

      IEEE: Trans. Nucl. Sci. 55

      Pages: 1372-1372

    • Related Report
      2008 Final Research Report
  • [Journal Article] Crystal Growth and Scintillation Properties of 2-Inch-Diameter Pr:Lu_3Al_5O_<12>(Pr:LuAG) Single Crystal2008

    • Author(s)
      K. Kamada, K. Tsutsumi, Y. Usuki, H. Ogino, T. Yanagida, A. Yoshikawa
    • Journal Title

      IEEE: Trans. Nucl. Sci. 55

      Pages: 1488-1488

    • Related Report
      2008 Final Research Report
  • [Journal Article] Suppression of host luminescence in the Pr : LuAG scintillator2008

    • Author(s)
      H. Ogino, K. Kamada, A. Yoshikawa, F. Saito, J. Pejchal, J.A. Mares, M. Nikl, A. Vedda, J. Shimovama and K. Kishio
    • Journal Title

      IEEE : Trans. Nucl. Sci 55

      Pages: 1197-1197

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Growth and optical properties of Lu3(Ga, Al)5O12 single crystals for scintillator application2008

    • Author(s)
      H. Ogino, A. Yoshikawa, J.A. Mares, M. Nikl, J. Shimoyama and K. Kishio
    • Journal Title

      J. Cryst. Growth 311

      Pages: 908-911

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Suppression of host luminescence in the Pr: LuAG scintillator2008

    • Author(s)
      H. Ogino, K. Kamada, A. Yoshikawa, F. Saito, J. Pejchal, J. A. Mares, M. Nikl, A. Vedda, J. Shimoyama and K. Kishio
    • Journal Title

      IEEE: Trans. Nucl. Sci. accepted (印刷中)(掲載確定)

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Scintillator materials-achievements, opportunities and puzzles2008

    • Author(s)
      M. Nikl, E. Mihokova, J. Pejchal, A. Vedda, M. Fasoli, I. Fontana, V.V. Laguta, V. Babin, K. Nejezchleb, A. Yoshikawa, H. Ogino, G. Ren
    • Journal Title

      IEEE: Trans. Nucl. Sci. accepted (印刷中)(掲載確定)

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Growth and Luminescence Properties of Pr-doped Lu_3(Ga,Al)_5O_<12> Single Crystals2007

    • Author(s)
      H. Ogino, A. Yoshikawa, M. Nikl, J. Pejchal, T. Fukuda
    • Journal Title

      Jpn. J. Appl. Phys. 46

      Pages: 3514-3517

    • Related Report
      2008 Final Research Report
  • [Journal Article] Crystal growth, optical and luminescence properties of Pr-doped Y_2SiO_5 single crystals2007

    • Author(s)
      A. Novoselov, H. Ogino, A. Yoshikawa, M. Nikl, J. Pejchal, A. Beitlerova, T. Fukuda
    • Journal Title

      Opt. Mat. 29

      Pages: 1381-1384

    • Related Report
      2008 Final Research Report
  • [Journal Article] Growth and Luminescence Properties of Pr-doped Lu_3(Ga,Al)_5O_<12> Single Crystals2007

    • Author(s)
      H. Ogino, A. Yoshikawa, M. Nikl, J. Pejchal and T. Fukuda
    • Journal Title

      Jpn. J. Appl. Phys. 46

      Pages: 3514-3517

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Presentation] 元素置換によるシンチレータ用ガーネット単結晶の高特性化2008

    • Author(s)
      荻野拓, 横田有為, 吉川彰, M. Nikl, 下山淳一, 岸尾光二
    • Organizer
      第69回応用物理学会学術講演会
    • Place of Presentation
      春日井
    • Year and Date
      2008-09-04
    • Related Report
      2008 Annual Research Report 2008 Final Research Report
  • [Presentation] Suppression of defect related host luminescence in LuAG single crystals2008

    • Author(s)
      H. Ogino, A. Yoshikawa, M. Nikl, A. Vedda, J. Shimoyama, K. Kishio
    • Organizer
      The 15th International Conference on Luminescence and Optical Spectroscopy of Condensed Matter
    • Place of Presentation
      France
    • Year and Date
      2008-07-08
    • Related Report
      2008 Final Research Report
  • [Presentation] Suppression of defect related host luminescence in LuAG single crystals2008

    • Author(s)
      H. Ogino, A. Yosnixawa, M. Niki., A. Vedda, J. Shimoyama, K. kishio
    • Organizer
      The 15th International Conference on Luminescence and Optical Spectroscopy of Condensed Matter
    • Place of Presentation
      フランス・リヨン
    • Year and Date
      2008-07-08
    • Related Report
      2008 Annual Research Report
  • [Presentation] Growth and optical properties of Lu_3(Ga,Al)_5O_<12> single crystals for scintillator application2008

    • Author(s)
      H. Ogino, A. Yoshikawa, M. Nikl, J. Shimoyama, K. Kishio
    • Organizer
      The 4th Asian Conference on Crystal Growth and Crystal Technology
    • Place of Presentation
      仙台
    • Year and Date
      2008-05-22
    • Related Report
      2008 Final Research Report
  • [Presentation] Growth and optical properties of Lu3(Ga,Al)5O12 single crystals for scintillator application2008

    • Author(s)
      H. Ogino, A. Yoshikawa, M. Nikl, J. Shimoyama, K. Kishio
    • Organizer
      The 4th Asian Conference on Crystal Growth and Crystal Technology
    • Place of Presentation
      仙台
    • Year and Date
      2008-05-22
    • Related Report
      2008 Annual Research Report
  • [Presentation] シンチレータ用ガーネット単結晶のホスト発光の抑制2007

    • Author(s)
      荻野拓, 吉川彰, M. Nikl, 下山淳一, 岸尾光二
    • Organizer
      第68回応用物理学会学術講演会
    • Place of Presentation
      札幌
    • Year and Date
      2007-09-07
    • Related Report
      2008 Final Research Report
  • [Presentation] シンチレータ用ガーネット単結晶のホスト発光の抑制2007

    • Author(s)
      荻野拓, 吉川彰, M. Nikl, 下山淳一, 岸尾光二
    • Organizer
      第68回 応用物理学会学術講演会
    • Place of Presentation
      札幌
    • Year and Date
      2007-09-07
    • Related Report
      2007 Annual Research Report
  • [Presentation] Suppression of host luminescence in Pr:LuAG scintillator2007

    • Author(s)
      H. Ogino, K. Kamada, A. Yoshikawa, J. Pejchal, M. Nikl, A. Vedda, J. Shimoyama, K. Kishio
    • Organizer
      9th International Conference on Scintillators and Their Applications
    • Place of Presentation
      USA
    • Year and Date
      2007-06-04
    • Related Report
      2008 Final Research Report
  • [Presentation] Scintillator materials-achievements, opportunities and puzzles2007

    • Author(s)
      M. Nikl, E. Mihokova, J. Pejchal, A. Vedda, M. Fasoli, I. Fontana, V.V. Laguta, V. Babin, K. Nejezchleb, A. Yoshikawa, H. Ogino, G. Ren
    • Organizer
      9th International Conference on Scintillators and Their Applications
    • Place of Presentation
      Winston-Salem, NC, USA
    • Year and Date
      2007-06-04
    • Related Report
      2007 Annual Research Report
  • [Presentation] Suppression of host luminescence in Pr: LuAG scintillator2007

    • Author(s)
      H. Ogino, K. Kamada, A. Yoshikawa, J. Pejchal, M. Nikl, A. Vedda, J. Shimoyama, K. Kishio
    • Organizer
      9th International Conference on Scintillators and Their Applications
    • Place of Presentation
      Winston-Salem, NC, USA
    • Year and Date
      2007-06-04
    • Related Report
      2007 Annual Research Report

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Published: 2007-04-01   Modified: 2016-04-21  

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