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Study on the Phase Transition Dynamics under Resonant Photoexcitation of Valence Electrons

Research Project

Project/Area Number 14540299
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅰ(光物性・半導体・誘電体)
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

HAYASHI Tetsusuke  Kyoto University, Graduate School of Human and Environmental Studies, Professor, 大学院・人間・環境学研究科・高等教育研究開発推進センター, 教授 (80026799)

Co-Investigator(Kenkyū-buntansha) SHIRAI Masanobu  Kyoto University, Department of Physics, Research Associate, 大学院・理学研究科, 助手 (30303803)
WATANABE Masayuki  Kyoto University, Graduate School of Human and Environmental Studies, Research Associate, 大学院・人間・環境学研究科, 助手 (20240525)
TANAKA Koichiro  Kyoto University, Department of Physics, Professor, 大学院・理学研究科, 教授 (90212034)
Project Period (FY) 2002 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2003: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2002: ¥2,000,000 (Direct Cost: ¥2,000,000)
KeywordsPHASE TRANSITION / ELECTRONIC EXCITATION / LATTICE RELAXATION / PHOTOLUMINESCENCE / インコメンシュレート相転移 / 励起子 / 光音響効果
Research Abstract

The purpose of this research project is to clarify the relation between the dynamical relaxation processes of electronic excited states and the structural phase transitions in ionic crystals.
(1)Structure of charge-separated self-tapped states of excitons in lead halides
Optically stimulated EPR investigations have been made on PbBr_2 and PbCl_2 crystals. Excitons in these crystals undergo charge separated relaxation into self-trapped electrons and holes due to the strong interaction with phonons. The structures of these self-trapped states were determined with EPR analysis; electrons are localized on Pb ion pairs and holes on halogen molecules (PbBr_2) and on isolated Pb atoms (PbCl_2), giving the primary process of photochemical changes.
(2)Relaxation_of electronic excitation under phase transitions in Cs_2CdI_4:Mn and Rb_2CdI_4:Mn
Photoluminescence spectra and the decay times of Mn ion centers were investigated in a wide temperature range across the phase transition temperatures in these crystals. The strong lattice relaxation was found to occur in the intermediate phase, the so-called incommensurate phase in Cs_2CdI_4. A similar behavior of photoluminescence revealed the existence of phase transitions in Rb_2CdI_4 which have not been reported so far.

Report

(3 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] M.Iwanaga, T.Hayashi et al.: "Self-trapped electrons and holes in PbBr_2 crystals"Phys.Rev.B. 65・21. 214306-1-214306-8 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Iwanaga, T.Hayashi: "Self-trapped states and related luminescence in PbCl_2 crystals"Phys.Rev.B. 66・6. 064304-1-064304-8 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 岩長祐伸, 林 哲介: "励起子の自発的な対分解現象"固体物理. 37・11. 817-822 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Iwanaga, T.Hayashi et al.: "Exciton-relaxation dynamics in lead halides"J.Luminescence. 102-103. 663-668 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 高岡友康, 渡辺雅之, 林 哲介: "Rb_2CdI_4:Mn結晶における発光と相転移"第14回光物性研究会論文集. 423-426 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Iwanaga, et al.: "Self-trapped electrons and holes in PbBr_2 Crystals"Phys.Rev.. B65(21). 214306-1-214306-8 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Iwanaga, et al.: "Self-trapped states and related luminescence in in PbCl_2 crystals"Phys.Rev.. B66(6). 064304-1-064304-8 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Iwanaga, et al.: "Spontaneous pair-dissociation of excitons"Solid State Physics. 37(11). 817-822 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Iwanaga, et al.: "Exciton-relaxation dynamics in lead halides"J.Luminescence. 102&103. 663-668 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Takaoka et al.: "Photoluminescence and phase-transition in Pb_2CdI_4:Mn crystal"14^<th> Proc. Symposium on Condensed Matter Photophysics. 423-426 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Iwanaga, T.Hayashi: "Exciton-relaxation dynamics in lead halides"J.Luminescence. 102-103. 663-668 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Ichimiya, T.Hayashi et al.: "Effect of uniaxial stress on photoluminescence in GaN and stimulated emission in InxGa1-xN/GaN multiple quantum wells"Phys.Rev.B. 68-3. 035328-1-035328-7 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Ichimiya, T.Hayashi et al.: "Carrier recombination processes in GaN, AlGaN, and InGaN epilayers"phys.status.solidi (a). 199. 347-354 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 高岡友康, 渡辺雅之, 林哲介: "Rb_2CdI_4:Mn結晶における発光と相転移"第14回光物性研究会論文集. 423-426 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Iwanaga, T.Hayashi et al.: "Self-trapped electrons and hdes in PbBr_2 crystals"Phys. Rev. B. 65・21. 241306-1-241306-8 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Iwanaga, T.Hayashi et al.: "Self-trapped states and related luminescence in PbCl_2 crystals"Phys. Rev. B. 66・6. 064304-1-064304-8 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 岩長祐伸, 林哲介: "励起子の自発的な対分解現象 -ハロゲン化鉛結晶におけるポーラロン間の斥力相関-"固体物理. 37・11. 817-822 (2002)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2020-05-15  

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