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Photodynamics of Organic Thin Film Multilayer Struvtures with Optical Functions

Research Project

Project/Area Number 11450013
Research Category

Grant-in-Aid for Scientific Research (B).

Allocation TypeSingle-year Grants
Section一般
Research Field Applied materials science/Crystal engineering
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

FUJITA Shizuo  Kyoto Univ., Fac. Engineering, Associate Professor, 工学研究科, 助教授 (20135536)

Co-Investigator(Kenkyū-buntansha) KAWAKAMI Yoichi  Kyoto Univ., Fac. Engineering, Associate Professor, 工学研究科, 助教授 (30214604)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥9,200,000 (Direct Cost: ¥9,200,000)
Fiscal Year 2000: ¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 1999: ¥5,400,000 (Direct Cost: ¥5,400,000)
Keywordsorganic materials multilayer structures / HOMO energy / LUMO energy / photodynamics / radiative recombination lifetime / exciton localization / white EL / 光タイナミクス / Alq / TPD / PBD
Research Abstract

This research was carried out aimed at developing a new material structure with novel optical functions, i.e., organic thin film multilayer structures, through critical characterization of their photodynamics. The results are summarized as follows ;
1. Organic materials for electroluminescence (EL) applications were chosen as target for this reserach. Well-defined multilayer structures with aluminumquinoline (Alq3), diamine (TPD), oxadiazole (PBD), and cyclopentadiene (PPCP) were fabricated by molecular beam deposition technique with the controllability of smaller than 20Å, which was proven by x-ray diffraction and non-contact mode atomic force microscopy.
2. Techniques for elucidating energy structures of organic materials were developed by using UPS, excitation PL, and photoabsorption characteristics. The results revealed type-II energy lineup with respect to HOMO and LUMO levels for Alq/TPD and Alq/PPCP and type-I for Alq/PBD.
3. Photodynamics characterization conditions with time-resolved PL were established and with this technique fast (within few ps) energy transfer of photoexcited carriers to Alq followed by effective radiative recombination in type-I structures and separation of electrons and holes in different layers in type-II structures were evidenced.
4. Doping of C60 into electron transport layers enhanced electron mobility and this successfully improved the efficiency of EL devices where electron mobility dominated the total efficiency.
5. Based on the photodynamics revealed in this study, novel structures for EL devices were newly proposed and actually contributed to improvement of efficiency of green EL devices and visibility of white EL devices.

Report

(3 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] S.Fujita,T.Nakazawa,M.Asano 他: "Luminescence dynamics of Alq_3-based multilayer structures in terms of HOMO and LUMO energy discontinuity"Materials Research Society 1999 Fall Meeting Proceedings, (on-line publication http://www.mrs.org). BB3.68 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] S.Fujita,T.Nakazawa,M.Asano 他: "Comparative Study of Photoluminescence Dynamics of Tris(8-Hydroxyquinoline) Aluminum-Based Organic Multilayer Structures with Different Types of Energy Lineups"Japanese Journal of Applied Physics. 39(9A). 5301-5309 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] FUJITA, Shizuo, et al.: "Luminescence dynamics of Alq3-based multilayer structures in terms of HOMO and LUMO energy discontinuity"Materials Research Society 1999 Fall Meeting Proceedings. (on-line publication ; http : //www.mrs.org) BB3.68. (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] FUJITA, Shizuo, et al.: "Comparative Study of Photoluminescence Dynamics of Tris (8-Hydroxyquinoline) Aluminum-Based Organic Multilayer Structures with Different Types of Energy Lineups"Japanese Journal of Applied Physics. Vol.39, No.9A. 5301-5309 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] S.Fujita,T.Nakazawa,M.Asano 他: "Luminescence dynamics of Alq3-based multilayer structures in terms of HOMO and LUMO energy discontinuity"Materials Research Society 1999 Fall Meetings Proceedings,(on-line publication http://www.mrs.org). BB3.68 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] S.Fujita,T.Nakazawa,M.Asano 他: "Comparative Study of Photoluminescence Dynamics of Tris (8-Hydroxyquinoline) Aluminum-Based Organic Multilayer Structures with Different Types of Energy Lineups"Japanese Journal of Applied Physics. 39(9A). 5301-5309 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] S.Fujita,T.Nakazawa,M.Asano 他: "Luminescence dynamics of Alq3-based multilayer structures in terms of HOMO and LUMO energy discontinuity"Materials Research Society Fall Meetings Proceedings. (印刷中).

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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