Excitonic processes aromatic microcrystallites and bulk exciton bandwidths 芳香族超微粒子の励起子過程とバルク結晶の励起子帯幅

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著者

    • 尾枝, 芳隆 オエダ, ヨシタカ

書誌事項

タイトル

Excitonic processes aromatic microcrystallites and bulk exciton bandwidths

タイトル別名

芳香族超微粒子の励起子過程とバルク結晶の励起子帯幅

著者名

尾枝, 芳隆

著者別名

オエダ, ヨシタカ

学位授与大学

甲南大学

取得学位

博士 (理学)

学位授与番号

乙第11号

学位授与年月日

1997-09-26

注記・抄録

博士論文

A novel experimental method, based on the technology to determine the singlet lowest exciton bandwidth in molecular crystals is reported here. In this method the analysis of the excitation spectrum in microcrystallites is used as a key tool to determine the exciton bandwidth. Analyzing the excitation spectra of pyrene microcrystallites at 2K, we have found that the lowest 1Lbsinglet exciton bandwidth increases superlinearly with microcrystallite size toward a maximum value of 330 cm-1, which is interpreted to be the bandwidth of the lowest exciton band(1Lb band) in the bulk crystal.The bandwidth of the bulk crystal thus obtained is discussed in connection with the Davydov splitting of only 15 cm-1. The bandwidths in small microcrystallites are interpreted in terms of the energy separation calculated by the Frenkel exciton theory. Using the bandwidth obtained for bulk pyrene crystal and exciton-phonon coupling constant, the lattice relaxation energy for the 1Lb exciton has been estimated to be 180 cm-1 and the self-trap depth for the V state to be 15cm-1.We have found that the k selection rule for the exciton creation is not applicable in small size pyrene microcrystallites, but it is applicable to microcrystallites larger than 50 A°. Comparing the exciton bandwidth in pyrene and anthracene microcrystallites, it is found that the exciton surface scattering does not occur in pyrene microcrystallites but it occurs strongly in anthracene microcrystallites. The surface scattering layer thickness in anthracene microcrystallites is found to be 30 A°.

平成9年度(1997年度)

目次

  1. ABSTRACT / p1 (0002.jp2)
  2. TABLE OF CONTENTS / p5 (0006.jp2)
  3. 1.INTRODUCTION / p6 (0007.jp2)
  4. 2.FRENKEL EXCITONS IN MICRO CRYSTALLITES / p11 (0012.jp2)
  5. 2-1.Frenkel Excitons / p11 (0012.jp2)
  6. 2-2.Exciton Bandwidth in Bulk Crystals / p14 (0015.jp2)
  7. 2-3.Exciton Bandwidth in Microcrystallites / p14 (0015.jp2)
  8. 3.EXPERIMENTAL / p17 (0018.jp2)
  9. 3-1.Character of Materials / p17 (0018.jp2)
  10. 3-2.Preparation of Specimens / p18 (0019.jp2)
  11. 3-3.Optical System / p19 (0020.jp2)
  12. 4.RESULTS / p21 (0022.jp2)
  13. 4-1.Absorption and Luminescence Spectra in Pyrene Microcrystallites / p21 (0022.jp2)
  14. 4-2.Microcrystallite Size / p26 (0027.jp2)
  15. 4-3.Excitation Spectra / p28 (0029.jp2)
  16. 5.DISCUSSION / p34 (0035.jp2)
  17. 5-1.Exciton Bandwidth and V luminescence State / p34 (0035.jp2)
  18. 5-2.Recovery of the k Selection Rule / p38 (0039.jp2)
  19. 5-3.Surface Scattering Layer / p39 (0040.jp2)
  20. 5-4.Broadening of Spectral Bandwidth due to Surface Scattering Effect / p42 (0043.jp2)
  21. 5-5.Excitonic States in Microcrystallites / p42 (0043.jp2)
  22. 5-6.Size Dependence of Exciton Bandwidth / p47 (0048.jp2)
  23. 6.CONCLUSION / p48 (0049.jp2)
  24. REFERENCES / p48 (0049.jp2)
  25. EXCITON BAND STRUCTURE OF CRYSTALLINE ANTHRACENE / p849 (0055.jp2)
  26. DENSITY OF STATES AND THE EXCITON BAND STRUCTURE IN CRYSTALLINE ANTHRACENE / p41 (0061.jp2)
  27. An Experimental Approach to Determine the Density of States of an Exciton Band from Thermoabsorption Spectra / (0066.jp2)
  28. Dynamical Behavior of Excitons in Crystalline Anthracene and Phenanthrene / (0072.jp2)
  29. Densities of states of the ¹Lb exciton band and luminescence processes in pyrene / p181 (0086.jp2)
  30. Breakdown of the k Selection Rule and the ¹Lb Exciton Bandwidth in Pyrene Microcrystallites / p201 (0090.jp2)
  31. New technique to determine exciton bandwidths of the lowest exciton band in aromatic molecular crystals / p103 (0095.jp2)
  32. EXCITON DENSITIES OF STATES AND EXCITON BANDWIDTHS IN ANTHRACENE AND PYRENE MICROCRYSTALLITES / (0099.jp2)
  33. Size Dependence of Exciton Bandwidth and Exciton Surface Scattering at Microcrystallite Surface Region / p29 (0103.jp2)
  34. Exciton scattering,κ selection rule,exciton bandwidth in pyrene microcrystallites,and lattice relaxation energy for the origin of V luminescence / p421 (0108.jp2)
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各種コード

  • NII論文ID(NAID)
    500000152795
  • NII著者ID(NRID)
    • 8000001086973
  • DOI(NDL)
  • 本文言語コード
    • eng
  • NDL書誌ID
    • 000000317109
  • データ提供元
    • 機関リポジトリ
    • NDL ONLINE
    • NDLデジタルコレクション
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