| Project/Area Number |
16310094
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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 |
Nanomaterials/Nanobioscience
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| Research Institution | Toyota Central R&D Labs., Inc. |
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Principal Investigator |
INAGAKI Shinji Toyota Central R&D Labs., Inc., Frontier Research Department, Leader, Principal Researcher, フロンティア研究部門 稲垣研究グループ・リーダ, 主席研究員 (30374086)
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| Co-Investigator(Kenkyū-buntansha) |
GOTO Yasutomo Toyota Central R&D Labs., Inc., Frontier Research Department, Leader, Researcher, フロンティア研究部門 稲垣研究グループ, 研究員 (80394790)
OHASHI Masataka Toyota Central R&D Labs., Inc., Frontier Research Department, Leader, Associate Reseacher, フロンティア研究部門 稲垣研究グループ, 副研究員 (10418436)
大谷 修 株式会社豊田中央研究所, フロンティア研究部門, 客員研究員
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| Project Period (FY) |
2004 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥10,700,000 (Direct Cost: ¥10,700,000)
Fiscal Year 2005: ¥5,400,000 (Direct Cost: ¥5,400,000)
Fiscal Year 2004: ¥5,300,000 (Direct Cost: ¥5,300,000)
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| Keywords | Mesoporous material / Organic-inorganic hybrid / Emitted materials / Fluorescence dye / Quantum yield / Organic group / Photosynthesis / メソポーラス物質 |
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| Research Abstract |
We have obtained mainly three results, (1)understanding of fluorescence properties and discovery of unique light harvesting antenna property of mesoporous biphenylylene-silica (BPh-HMM), (2)the synthesis of novel mesoporous organosilicas with optical function, and (3)the construction of an electrical luminescence devices and it's luminescence property, (1)Fluorescence quantum yield of BPh-HMM solid was determined as Φ=0.37-0.56(λ_<ex.>=270,λ_<em.>=370nm) by using an absolute PL Quantum Yield Measurement System (Hamamatsu Photonics). It is higher than the quantum yields of biphenyl (C_6H_5-C_6H_5,Φ=0.07) and biphenyl-disilane precursor [(EtO)_3Si-C_6H_4-C_6H_4-Si(OEt)_3,Φ=0.23]. The high quantum yield for BPh-HMM is generated by the unique arrangement of biphenylylene and silica species, which prevent the fluorescence quenching of biphenylylene species. The excitation energy of biphenylylene was effectively transferred to coumarin dye located in the mesopores. Small addition of coumarin
… More
dye (0.5 mol% -biphenylylene) completely quenched the biphenylylene fluorescence (λ_<em>=270nm) and in turn emitted strongly coumarin fluorescence (λ_<em>=450nm). The fluorescence quantum yield of coumarin/BP-HMM was almost Φ=1(λ_<ex.>=270,λ_<em.>=450nm). The high quantum yield indicates that mesoporous organosilicas are excellent light harvesting antenna function. (2)We have synthesized new mesoporous organosilicas from optically functional terphenyl, naphthalene, anthracene, pyrene, fluorene, and carbazole-bridged disilane precursors [(EtO)_3Si-R-Si(OEt)_3]. They had absorption bands at 270-400 nm and emission bands at 370-520 nm in visible region, which is merit for applications to visible emitted devices and solar energy conversion devices. (3)We made the electrical emitted devices using mesoporous organosilicas including biphenylylene, anthracene, carbazole as emitted layer sandwiched by electrical and hole injection layers. The devices emitted electrically, but efficiency and life time are insufficient for the actual uses. The wavelength of the emission can be tunable by selecting organic groups in the framework and dyes introduced in the mesopores. These results revealed that mesoporous organosilicas showed excellent photoluminescence and light harvesting antenna properties and have highly potential applications to solar energy conversion system. Less
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