| Project/Area Number |
06805005
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Applied optics/Quantum optical engineering
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| Research Institution | Saitama University |
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Principal Investigator |
KAMATA Norihiko Saitama Univ., Faculty of Engineering, Assoc.Prof., 工学部, 助教授 (50211173)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAGUCHI Katsuhiko Saitama Univ., Faculty of Engineering, Res.Assoc., 工学部, 助手 (30251143)
TAKAHASHI Kohroh Saitama Univ., Cooperative Research center, Assoc.Prof., 地域共同研究センター, 助教授 (10124596)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1995: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1994: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Keywords | Rare-Earth Ions / Fluorescent Glasses / Resonant-Energy Transfer / Phosphor / Concentration Quenching |
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| Research Abstract |
Photoluminescence (PL) spectroscopy of Tb^<3+>-doped fluorescent glasses was carried out under two-wavelength excitation condition, aiming at a change in their emission on spectra. Both experimental and theoretical results were summarized as follows :
1.The lifetime of ^5D_4 level of Tb^<3+>, which should be free from the influence of the resonant-energy transfer at high ionic concentration region, was measured by selective excitation of either ^5D_3 or ^5D_4.
2.Each parameter in the nonlinear rate-equations of the resonant-enerygy transfer was determined self-consistently by using the experimental data.
3.The realization of controlling the emission spectrum by the IR light, which is resonant to the energy difference between ^5D_3 and ^5D_4 (lambda=1.6mum), depends principally on the excitation density of the resonant IR light.
4.When the ^5D_3 (CW) excitation was added to that the ^5D_4 (pulsed), we have observed a change in the time-decay characteristics of the ^5D_3-^7F_5 emission for the first time. The change corresponds to the dynamic interaction between two excitations and is thought to be quite interesting as a point of view of controlling emission spectrum.
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