| Project/Area Number |
09555275
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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 | 展開研究 |
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| Research Field |
無機工業化学
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| Research Institution | NIIGATA UNIVERSITY |
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Principal Investigator |
SATO Mineo Niigata University, Depart. of Chem. and Chem. Eng., Professor, 工学部, 教授 (30149984)
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| Co-Investigator(Kenkyū-buntansha) |
AOKI Yasumitsu NEMOTO & CO., LTD., 平塚工場・技術開発課, 課長代行
SUGAI Takashi NEMOTO & CO., LTD., R & D Dept No. 1, General Manager, 技術開発本部, 主任研究員
TODA Kenji Niigata University, Depart. of Chem. and Chem. Eng., Associate Professor, 工学部, 助教授 (20293201)
叶 作光 新潟大学, 工学部, 助教授 (60282993)
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| Project Period (FY) |
1997 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥8,600,000 (Direct Cost: ¥8,600,000)
Fiscal Year 1999: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1998: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1997: ¥6,700,000 (Direct Cost: ¥6,700,000)
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| Keywords | Luminescence / Concentration quenching / Low-dimensional structure / Crystal structure / Percolation model / Excitation energy |
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| Research Abstract |
The present study has been aimed to obtain fundamental aspects on the design for luminescent materials with a low-dimensional arrangement of emission center. The quenching of EuィイD13+ィエD1 - emission in the layered perovskite compounds SrREィイD22ィエD2AlィイD22ィエD20ィイD27ィエD2, BaREィイD22ィエD2TiィイD23ィエD20ィイD210ィエD2, RETaィイD23ィエD20ィイD29ィエD2 and RbRETaィイD22ィエD20ィイD27ィエD2 (RE = rare earths) with two dimensional arrangement of rare earth ions was investigated. The highest luminescence intensity was observed in both tantalum compounds, RETaィイD23ィエD20ィイD29ィエD2 and RbRETaィイD22ィエD2OィイD27ィエD2. The concentration quenching found in these compounds can be explained by a percolation model with two-dimensional interactions between the neighboring EuィイD13+ィエD1 sites in the host lattice. It is confirmed that the energy transfer between the EuィイD13+ィエD1 ions takes place through the multipole-multipole interaction among the nearest-neighbor sites in the rare earth sublattice.
We also investigated the luminescence property of pyroxene type compounds, AVOィイD23ィエD2 (A = Cs, Rb, K), with a one-dimensional VOィイD24ィエD2 chain. These compounds show an efficient green leminescence. We have comprehensively discussed the correlation between their crystal structure and high-brightness. One of the reason for the high luminescence intensity found in these compounds is the low-dimensional arrangement of the emission center in the crystal structure.
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