2001 Fiscal Year Final Research Report Summary
Optical studies on nucleation and nanoparticle growth
| Project/Area Number |
12640324
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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 | Nihon University |
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Principal Investigator |
MOCHIZUKI Shosuke Nihon University, College of Humanities and Sciences, Professor, 文理学部, 教授 (20006159)
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| Project Period (FY) |
2000 – 2001
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| Keywords | nanoparticles / nucleation and nonoparticle growth / energy pooling / radiation trapping / metal clusters / superionic conductor glass / photomemorv materials / polytype clusters |
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| Research Abstract |
By using the space-resolved, time-resolved and selective excitation spectroscopic methods, we have studied the nucleation and nanoparticle growth of various kinds of clusters and nanoparticles ;
(1) alkali metal and rare-earth metal clusters in noble gas : Na, K, Rb, Sm, Eu and Yb,
(2) nanoparticles in superionic conductor glasses : (AgI)_x-(AgPO_3)_<1-x>,(AgI)_x-(Ag_2Mo_4)_<1-x> (M : Mo, W) and
(3) luminescent clusters in rare-earth oxide solid : Eu_2O_3.
The following results are obtained.
(1) alkali metal and rare-earth metal clusters in noble gas
The emission spectra indicating the excitation energy transfer between vapour species, energy pooling and radiation trapping in alkali metal vapour zones are clearly observed.
(2) nanoparticles in superionic conductor glass
The photoluminescence and excitation spectra indicate the nucleation and nanoparticle growth the superionic conductor glasses with increasing AgI concentration, and also give important information on the electronic states between the nanoparticles and glass matrix.
(3) luminescent clusters in Eu_2O_3
Under irradiating a CW UV laser light at room temperature in vacuum and oxygen gas atmosphere, the film, microcrystals and powder compact of Eu_2O_3 exhibit a reversible photoluminescence (PL) spectral change between a red sharp-line structure and a white broad one. The reversible phenomena to be observed are interpreted as the results of both the valence-number change of europium ions (Eu^<3+> → Eu^<2+>) and the luminescent clusters combined oxygen vacancies and Eu^<2+> ions.
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Research Products
(6 results)
