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Acoustic Wave Effect on Bound Excitons and Size-quantized Excitons

Research Project

Project/Area Number 10640296
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 InstitutionTOHOKU UNIVERSITY

Principal Investigator

GOTO Takenari  Graduate School of Science, Tohoku University, Professor, 大学院・理学研究科, 教授 (10004342)

Co-Investigator(Kenkyū-buntansha) YAMAMOTO Aishi  Graduate School of Science, Tohoku University, Research Physicist, 大学院・理学研究科, 助手 (10261546)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1999: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1998: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsCdS / acoustic wave / luminescence
Research Abstract

Followings are results we obtained from the present study.
1) When the AC voltage of 8 MHz is applied to the CdS crystal, the decay time of the PL intensity gradually increases from 1.2 nsec and reaches the maximum at 1200 V/cm and then decreases down to 1.05 nsec at 1600 V/cm. The increase of the decay time in the low electric fields is caused by the fact that the overlap of the wave functions between the electron and hole decreases for piezo electric fields induced by the acoustic wave. The decrease in the high electric fields is caused by broadening of the potential well in the impurity center for the bound exciton. Moreover, the growth in the acoustic phonon wing of the IィイD21ィエD2 PL line, the shift of the absorption edge to the low energy side and the disappearance of the AィイD21ィエD2 phonon Raman line have been observed, and these phenomena are explained by the inhomogeneous electric fields generated around the impurity center by the acoustic wave.
2) When an acoustic wave is applied to the ZnSe quantum well, there appears a short decay component in the time response of the PL intensity due to the exciton in the ZnSe quantum well. The PL intensity in the 4 eV light excitation decreases gradually with increasing the acoustic wave intensity and decreases suddenly at a given intensity of the acoustic wave. Such a phenomenon does not occur in the excitation of 3.5 eV light. We interpreted as follows. The free exciton is ionized by the electric field resulting in the decrease in the PL intensity. On the other hand, the free exciton is localized by the acoustic wave and causes the decrease of the free exciton lifetime. As a result, the lifetime of the PL decreases.

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] O.A.Korotchenkov and T.Goto: "Acoustically driven bound exciton lifetimes in CdS crystals"Appl. Phys. Lett.. 72. 1733-1735 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] O.A.Korotchenkov and T.Goto: "Study on bound exciton dynamics in CdS crystals at acoustic driving"Physica B. 253. 203-214 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] O.A.Korotchenkov and T.Goto: "Powder agglomeration patterns at acoustic driving observed by sonoluminescence technique"J. Appl. Phys.. 85. 1153-1158 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] I.Ostrovskii,O.A.Korotchenkov,T.Goto and H.G.Grimmeiss: "Sonoluminescence and acoustically driven optical phenomena in solids and solid-gas interfaces"Phys. Rep.. 311. 1-46 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] A.Korotchenkov,A.Yamamoto,T.Goto,M.-W.Cho and T.Yao: "Acoustic driving effect on radiative decays of excitons in ZnSe/ZnS single quantum wells"Appl. Phys. Lett.. 74. 3179-3181 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] O.A. Korotchenkov and T. Goto: "Acoustically driven bound exciton lifetimes in CdS crystals"Appl. Phys. Lett.. 72(14). 1733-1735 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] O.A. Korotchenkov and T. Goto: "Study on bound exciton dynamics in CdS crystals at acoustic driving"Physica B. 253. 203-214 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] O.A. Korotchenkov and T. Goto: "Powder agglomeration patterns at acoustic driving observed by sonoluminescence technique"J. Appl. Phys.. 85(2). 1153-1158 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] I.V. Ostrovskii, O.A. Korotchnkov, T. Goto and H.G. Grimmeiss: "Sonoluminescence and acoustically driven optical phenomena in solids and solid-gas interface"Phys. Rep.. 311(1). 1-46 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] O.A. Korotchenkov, A. Yamamoto, T. Goto, M.-W. Cho and T. Yao: "Acoustic driving effect on radiative decays of excitons in ZnSe/ZnS single quantum wells"Appl. Phys. Lett.. 74(21). 3179-3181 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] O.A.Korotchenkov and T.Goto: "Acoustically driven bound exciton lifetimes in CdS crystals"Appl. Phys. Lett.. 72・14. 1733-1735 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] O.A.Korotchenkov and T.Goto: "Study on bound exciton dynamics in CdS crystals at acoustic driving"Physica B. 253. 203-214 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] O.A.Korotchenkov and T.Goto: "Powder agglomeration patterns at acoustic driving observed by sonoluminescence technique"J. Appl. Phys.. 85・2. 1153-1158 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] I.V.Ostrovskii,O.A.Korotchenkov,T.Goto and H.G.Grimmeiss: "Sonoluminescence and acoustically driven optical phenomena in solids and solid-gas interfaces"Phys. Rep.. 311・1. 1-46 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] O.A.Korotchenkov,A.Yamamoto,T.Goto,M.-W.Cho and T.Yao: "Acoustic driving effect on radiative decays of excitons in ZnSe/ZnS single quantum wells"Appl. Phys. Lett.. 74・21. 3179-3181 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] O.A.Korotchnkov and T.Goto: "Acoustically driven bound exciton lifetimes in CdS crystals" Applied Physics Letters. 72・14. 1733-1735 (1998)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2020-05-15  

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