1999 Fiscal Year Final Research Report Summary
Photo-luminescence properties of nano-structured SiO_2 glasses doped with transition metal and rare earth ions
| Project/Area Number |
10640567
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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 |
機能・物性・材料
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| Research Institution | Seikei University |
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Principal Investigator |
MORITA Makoto Seikei Univ., Dept.Ind.Chem., Prof., 工学部, 教授 (70054351)
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| Co-Investigator(Kenkyū-buntansha) |
DORIS Rau 成蹊大学, 工学部, 嘱託助手
BABA Motoyoshi Univ. Tokyo, ISSP, Res.Associate, 物性研究所, 教務職員 (60159077)
RAU Doris Seikei Univ., Dept.Ind.Chem., Res.Associate
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| Project Period (FY) |
1998 – 1999
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| Keywords | sol-gel glass / transition metal ion / rare earth ion / luminescent properties / nanostructure |
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| Research Abstract |
1) Thin zirconia film doped with semiconductor nanocrystals [xZr0_2 1OO-x CdS : Mn^<2+> and Eu^<3+> (x=20, 50, 80)] were prepared according to the sol gel method and luminescence was measured in the temperature range between 10 and 300 K.In addition time-resolved spectra (TRS) and lifetimes were measured. The observed broad band emission is composed of band-edge emission (CdS), LMCT centers (Zr0_2), deep centers and lattice-bound d-d (Mn^<2+>) or f-f (Eu^<3+>) transitions. The luminescence is characterized by very fast relaxation processes of 1 ns and high thermal activation energy due to the presence of surface-bound deep centers.
2) Sol-gel silica glasses doped with transition metal complexes were prepared by the sol-gel method in order to investigate changes of valences of Cr and V ions in mesoporous matrices. In the glasses, annealed above 500 ℃, a structured broad band is found due to LMCT transitions in [Cr(VI)O_4]^<2-> and [V(V)0_4]^<3-> ions. The spectral shapes, lifetimes and vibronic structures change due to structural changes at higher temperatures.
3) Xerogel and annealed sol-gel silica glasses doped with europium complexes of 15-crown-5 were studied similarly. The ^5D_0->^7F_1 transition gives evidence of the stabilization of the complex in xerogel and glasses annealed below 100 ℃ for 24 hrs. From the splitting of the ^5D_0->^7F_1 transition, crystal field parameters B_0^<(2)>, B_2^<(2)> are derived. Axial symmetry is decreasing with increase of annealing temperatures.
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[Publications] M.Morita, D.Rau, H.Fujii, T.Minami, M.Baba, B.Yoshita, Y.Akiyama, S.Murakami, M.Morita, M.Herren, T.Sakura, D.Rau: "Near-infrared luminescence and spectral anomaly in PLZT ceramics doped with Pr^<3+>, Nd^<3+>, Yb^<3+> and Cr^<5+> ions at low temperatures"J.Lumin. 83-84. 215-219 (1999)
Description
「研究成果報告書概要(欧文)」より
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