2003 Fiscal Year Final Research Report Summary
High Luminosity and Dynamics on High Density electronic Excited States in Nano-Structure Materials
| Project/Area Number |
14540308
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
固体物性Ⅰ(光物性・半導体・誘電体)
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| Research Institution | Osaka City University |
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Principal Investigator |
AKAI Ichiro Osaka City University, Graduate School.of Science, Assoc.Professor, 大学院・理学研究科, 助教授 (20212392)
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| Co-Investigator(Kenkyū-buntansha) |
KANEMOTO Katsuichi Osaka City University, Graduate School.of Science, Res.Assoc., 大学院・理学研究科, 助手 (40336756)
KARASAWA Tsutomu Osaka City University, Graduate School.of Science, Professor, 大学院・理学研究科, 教授 (90106336)
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| Project Period (FY) |
2002 – 2003
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| Keywords | Semiconductor Nanostructure / Exciton / High Intensity Luminescence / Dynamics of Photo-Excited States / High Density Excitation / Electronic Excited States / Photo-Functional Organic Molecules / Condensed Matter Physics |
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| Research Abstract |
(1)High Density Excitons in Semiconductor Quantum Wires
High energy shifts due to repulsive interactions among high density excitons were found out in AlGaAs quantum wires under high density photo-excitation.
(2)High Density Excitons in Naturally Formed Quasi-Two Dimensional Nano-Structures
Temporal and spatial dynamics on recoil luminescence of high-density excitons in layered semiconductors were investigated. Thermal distribution in the exciton band and a variation of the group velocity of the exciton-polaritons depending on the band shape governs the temporal and spatial dynamics of the high density excitons.
(3)High Density Excitons in Semiconductor Microcrystallites Embedded in Matrices
On HgI_2 microcrystallites embedded in porous CAPRON polymers, a co-existence of the bi-exciton and excitonic inelastic luminescence bands was observed under extremely low-density excitation. The low-density threshold of these nonlinear luminescence was realized by a high efficient energy transfer from matrices into microcrystallites.
(4)Photo-Excited States in High Luminous Organic Materials
By a photocalorimetric spectroscopy, nonradiative relaxations in high luminous material Alq_3 were directly studied. It was found that the Alq_3 has a high luminous quantum yield more than 70%.
(5)Photo-Excited States in High Luminous π-Conjugating Polymers
On polythiophene dispersed in inert polymers, morphology dependence of the luminescent states in polythiophene was investigated. It was found that a degree of the lattice relaxation and a nonradiative inter-chain interactions were seriously depending on the morphology.
(6)Photo-Excited States in Light-Harvesting Dendrimers
On dendrimers having π-conjugating peripheries, high efficient light energy conversion was realized. It found that rapid energy transfers occurs and short range interactions play an important role in small dendrimers.
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Research Products
(20 results)
