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ELEMENTARY RELAXATION PROCESSES IN PHOTO-EXCITED STATES IN THE WEAK ELECTRON-LATTICE COUPLING SYSTEM

Research Project

Project/Area Number 06452047
Research Category

Grant-in-Aid for Scientific Research (B)

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

Principal Investigator

NAKAMURA Kaizo  OKAYAMA UNIV.PHYSICS PROFESSOR, 理学部, 教授 (40025359)

Co-Investigator(Kenkyū-buntansha) SUEMOTO Tohru  TOKYO UNIV.ISSP ASSOCIATE PROF., 物性研究所, 助教授 (50134052)
ARIMOTO Osamu  OKAYAMA UNIV.PHYSICS ASSOCIATE PROF., 理学部, 助教授 (70193092)
山下 信彦  岡山大学, 理学部, 助教授 (60032819)
Project Period (FY) 1994 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥7,700,000 (Direct Cost: ¥7,700,000)
Fiscal Year 1996: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1995: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1994: ¥6,200,000 (Direct Cost: ¥6,200,000)
KeywordsEXCITON POLARITON / RELAXATION PROCESSES / ZINC DIPHOSPHIDE / ELECTRON-LATTICE INTERACTION / WEAK COUPLING SYSTEM / RESONASNCE RAMAN / INTER-SYSTEM CROSSING / MAGNETIC FIELD EFFECTS / 共鳴ラマン散乱
Research Abstract

We have investigated the resonant secondary emission from the monoclinic zinc diphosphide beta-ZnP2 crystal in order to clarify the internal structure of exciton polariton and also the dynamics of the relaxation processes in the photo-excited states. The crystal beta-ZnP_2 is proved to be the model system of the weakest electron-lattice coupling as far as we are aware of. In the course of this project, we have obtained following results ;
1) In the relaxation from the higher exciton states as n=2,3,4 etc., the resonant 2LO Raman process is also important as is the ordinary 1LO scattering process. 2) In the excitation spectrum of the triplet exciton luminescence, we found very sharp Hydrogen-like series up to n=9. On the other hand, conversion from the triplet state to the singlet exciton polariton luminescence occurs only from the new sharp exciton series for n<greater than or equal>3, which is different from s-like series, but associated with d-like ones derived from the s-d mixing. Th … More is result poses a new problem upon the internal structure of the exciton. 3) Under the magnetic field, those peaks in the excitation spectra shows sharp fine characteristic Zeeman splitting. Fine dichroic Zeeman patterns are also observed in the triplet exciton luminescence spectra. These results were presented at the International Conference on Luminescence in Prague. A graduate course student obtained D.Sc.on the basis of there results. 4) Decay time of triplet exciton luminescence has been observed to be of the order of nanosecond, too short to be explained by using the very small oscillator strength of 10^<-6>. From the detailed analysis, it is found that the triplet excitons easily form exciton molecules. There is a possibility that triplet excitons are transferred into the singlet state by absorbing acoustic phonons which was suggested by the experiment of anti-Stokes excitation spectra. This is the new relaxation process so far not found in the intermediate and strong electron-lattice coupling systems. Together with the dispersion curve of triplet exciton polariton determined by the hyper-Raman experiment by Prof.Froehlich in Dortmund, numerical analysis of relaxation rate seems to become possible. 5) In another polymorph alpha-ZnP_2, two-phonon assisted indirect exciton luminescence is clearly confirmed through the temperature change of luminescence. This result was presented at the international conference of exciton in Germany and also published in JPSJ.
Collaboration is still in progress in ISSP Univ.Tokyo on the temperature change experiment of the luminescence in beta-ZnP_2 , also in Kyoto on the time domain experiments and in Dortmund Univ.on the nonlinear spectroscopy. Less

Report

(4 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • 1994 Annual Research Report
  • Research Products

    (35 results)

All Other

All Publications (35 results)

  • [Publications] 杉崎満: "Intersystem Conversion between Singlet and Triplet Exciton States in β-ZnP_2" Journal of the Physical Society of Japan. 65・1. 23-26 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 杉崎満: "Exciton Relaxation in β-ZnP_2 -Intersystem Conversion between Singlet and Triplet States-" Progress in Crystal Growth and Characterization of Materials. 33. 81-84 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] J.Engbring: "Two-Photon Absorption and Magnetoabsorption of P Excitons in β-ZnP_2" Physica Status Solidi (b). 196・1. 461-472 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 有本収: "Luminescent Lifetimes of Excitons in β-ZnP_2" Rep.Res.Lab.Surface Sci.Okayama Univ.7・6. 253-260 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 中村快三: "Two-Phonon Assisted Indirect Exciton Luminescence in α-ZnP_2" Journal of the Physical Society of Japan. 66・2. 493-498 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 杉崎満: "Magnetic Field Effects on Luminescence and Excitation Spectra in β-ZnP_2" Journal of Luminescence. (in press). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Osamu Arimoto: "Resonant secondary emission and its excitation energy dependence in monoclinic zinc diphosphide" J.Phys.Soc.Jpn.63-11. 4249-4255 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Osamu Arimoto: "Resonant Secondary Emission in beta-ZnP_2" SPIE-Int.Soc.Opt.Eng.2362. 442-448 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Mitsuru Sugisaki: "2s and 3s Exciton Luminescence in beta-ZnP_2" SPIE-Int.Soc.Opt.Eng.2362. 502-507 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Mitsuru Sugisaki: "Emission from the Higher Members of Exciton (n=2,3, and 4) in beta-ZnP_2" J.Phys.Soc.Jpn.65-9. 3506-3513 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Mitsuru Sugisaki: "Intersystem Conversion between Singlet and Triplet Exciton States in beta-ZnP_2" Rep.Res.Lab.Surf.Sci.Okayama Univ.7-5. 207-213 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Kaizo Nakamura: "Two-phonon Assistted Indirect Exciton Luminescence in alpha-ZnP_2" Rep.Res.Lab.Surf.Sci.Okayama Univ.7-5. 215-224 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Mitsuru Sugisaki: "Intersystem Conversion between Singlet and Triplet Exciton States in beta-ZnP_2" J.Phys.Soc.Jpn.65-1. 23-26 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] S.Spitzer: "Investigation of Hyper-Raman Scattering of Biexitons in beta-ZnP_2" Proc.Int.Conf.Phys.Semicond., Berlin. (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Mitsuru Sugisaki: "Exciton Relaxation in beta-ZnP_2 -Intersystem Conversion between Singlet and Triplet States-" Prog.Crystal Growth and Charact.33. 81-84 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Kaizo Nakamura: "Two-phonon Asissted Indirect Exciton Luminescence in alpha-ZnP_2" Proc.Int.Conf.Excitonic Processes in Condensed Matter. 67-70 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] J.Engbring: "Two-Photon Absorption and Magnetoabsorption of P Excitons In beta-ZnP_2" Physica Status Solidi (b). 196. 461-472 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Osamu Arimoto: "Luminescent Lifetimes of Excitons in beta-ZnP2" Rep.Res.Lab.Surf.Sci.Okayama Univ.7-6. 253-260 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Kaizo Nakamura: "Two-Phonon Assisted Indirect Exciton Luminescence in alpha-ZnP_2" J.Phys.Soc.Jpn.66-2. 493-498 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Mitsuru Sugisaki: "Magnetic Field Effects on Luminescence and Excitation Spectra in beta-ZnP_2" J.Luminescence. (in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 杉崎 満: "Intersystem Conversion between Singlet and Triplet Exciton States β-ZnP_2" Journal of the Physical Society of Japan. 65・1. 23-26 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 杉崎 満: "Exciton Relaxation in β-ZnP_2 -Intersystem Conversion between Singlet and Triplet States-" Progress in Crystal Growth and Characterization of Materials. 33. 81-84 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] J.Engbring: "Two-Photon Absorption and Magnetoabsorption of P Excitons in β-ZnP_2" Physica Status Solidi (b). 196・1. 461-472 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 有本 収: "Luminescent Lifetimes of Excitons in β-ZnP_2" Rep.Res.Lab.Suface Sci.Okayama Univ.7・6. 253-260 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 中村快三: "Two-Phonon Assisted Indirect Exciton Luminescence in α-ZnP_2" Journal of the Physical Society of Japan. 66・2. 493-498 (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 杉崎 満: "Magnetic Field Effects on Luminescence and Excitation Spectrain in β-ZnP_2" Journal of Luminescence. (in press). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 有本 収: "Resonant secondary emission in β-ZnP_2" SPIE-Int.Soc.Opt.Eng.2362. 442-448 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 杉崎 満: "2S and 3S exciton luminescence in β-ZnP_2" SPIE-Int.Soc.Opt.Eng.2362. 502-507 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 杉崎 満: "Emission from the Higher Members o Exciton (n=2,3and4) in β-ZnP_2" J.Phys.Soc.Jpn.64. 3506-3513 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 杉崎 満: "Intersystem Conversion between Singlet and Triplet Exciton States in β-ZnP_2" Rep.Res.Lab.Surf.Sci.Okayama Univ.7. 207-213 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 中村快三: "Two-Phonon Assisted Indirect Exciton Lunriouescence in α-ZnP_2" Rep.Res.Lab.Surf.Sci.Okayama Univ.7. 215-224 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 杉崎 満: "Intersystem Coversion between Singlet and Triplet Exciton States in β-ZnP_2" J.Phys.Soc.Jpn.65. 23-26 (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 有本 収: "Resonant Secondary Emission and Its Excitation Energy Dependence in Monoclinic Zinc Diphosphide" J.Phys.Soc.Jpn. 63. 4249-4255 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 有本 収: "Resonant Secondary emission in β-ZnP_2" Proc.Int.Conf.Excitonic Processes in Condensed Matter. (印刷中). (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] 杉崎 満: "2s and 3s exciton luminescence in β-ZnP_2" Proc.Int Conf. Excitonic Processes in Condensed Matter. (印刷中). (1995)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2020-05-15  

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