1996 Fiscal Year Final Research Report Summary
Direct measurement of excitation energy relaxation processes in small domains by near field microspectroscopy
| Project/Area Number |
07454248
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Physical chemistry
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| Research Institution | Osaka University |
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Principal Investigator |
MASUHARA Hiroshi Osaka University, Department of Applied Physics, Professor, 工学部, 教授 (60029551)
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| Co-Investigator(Kenkyū-buntansha) |
ASAHI Tuyoshi Osaka University, Department of Applied Physics, Assistant Professor, 工学部, 助手 (20243165)
SASAKI Keiji Osaka University, Department of Applied Physics, Assistant Professor, 工学部, 助手 (00183822)
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| Project Period (FY) |
1995 – 1996
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| Keywords | near field optical microscope / fluorescence spectra / picosecond fluorescence dynamics / charge transfer complex / organic molecular crystal / tetracene / anthracene / mesoscopic |
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| Research Abstract |
By combining a scanning near field microscope and a single photon counting technique, we have developed a picosecond time-resolved near field fluorescence microspectroscopy system. Spatial resolution of 100 nm, temporal resolution of 50 ps, and spectral resolution of nm are simultaneously satisfeied, which is the most advanced system in our country and only a few laboratories have comparable systems as far as we know. The system has been applied to the following 3 organic molecular microcrystals. 1.Fluorescence spectra of deposited tetracene microcrystals were examined as a function of the crystal thickness of a few tens nm - submum, and it was found that the thinner is purer with the lower defect concentration. 2.fluorescence inhomogeneity of anthracene-tetrachlorophthalic anhydride charge transfer microcrystals were examined by measuring topography and fluorescence spectrum. Nonfluorescence domains, which are related or not related to topography, were discussed in terms of segregation of electron donor and acceptor molecules, orientation of donor-acceptor column, nonluminescent defect formation, and impurity contamination. 3.Mixed CT microcrystals of anthracene-tetrachlorophthalic anhydride and -pyromelitic anhydride show fiber-like structures whose orientation anisotropy and spatial inhomogeneity were considered with -100 nm resolution.
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Research Products
(2 results)
