Optical studies on nucleation and nanoparticle growth

成核和纳米粒子生长的光学研究

• 批准号: 12640324
• 负责人: MOCHIZUKI Shosuke
• 金额: $ 2.3万
• 依托单位: Nihon University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640324/
• 关键词: nanoparticles; nucleation and nonoparticle growth; energy pooling; radiation trapping; metal clusters; superionic conductor glass; photomemorv materials; polytype clusters; ナノクリスタル; 核生成; 結晶成長; 輻射トラッピング; フォトルミネッセンス; 超微子; アルカリ金属

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 gasThe 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 glassThe 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_3Under 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.

用空间分辨、时间分辨和选择激发光谱方法研究了惰性气体中碱金属和稀土金属团簇Na、K、Rb、Sm、Eu和Yb，超离子导体玻璃中纳米粒子（AgI）_x-（AgPO_3）_，（AgI）_x-<1-x>（Ag_2Mo_4）_<1-x>（M：Mo，W）和稀土氧化物固体中发光团簇Eu_2O_3的成核和纳米粒子生长。(1)在惰性气体中的碱金属和稀土金属团簇的发射光谱中，清楚地观察到了碱金属蒸气区中蒸气物种之间的激发能转移、能量汇集和辐射俘获。(2)超离子导体玻璃中的纳米粒子光致发光和激发光谱表明，随着AgI浓度的增加，超离子导体玻璃中的成核和纳米粒子的生长，并且还提供了关于纳米粒子与玻璃基质之间的电子状态的重要信息。(3)Eu_2O_3发光团簇在室温、真空和氧气气氛下，用连续紫外激光辐照Eu_2O_3薄膜、微晶和粉末压块，发现Eu_2O_3的光致发光（PL）光谱在红色锐线结构和白色宽线结构之间发生可逆的变化。观察到的可逆现象被解释为铕离子的价数变化（Eu^&lt;3+&gt; → Eu^&lt;2+&gt;）和氧空位与Eu^&lt;2+&gt;离子结合的发光团簇的结果。

项目成果

Shosuke MOCHIZUKI: "Stacking faults and excitons in AgI"Physica B. 308-310. 1042-1045 (2001)

Shosuke Mochizuki：“AgI 中的堆垛层错和激子”Physica B. 308-310。

Shosuke MOCHIZUKI: "Reversible photoinduced spectral change in Eu_2O_3 at room temperature"Applied Physics Letters. 79. 3785-3787 (2001)

Shosuke Mochizuki：“室温下Eu_2O_3的可逆光致光谱变化”应用物理快报。

S. Mochizuki: "Stacking faults and excitons in AgI"Physica B. Vol. 308-310. 1042-1045 (2001)

S. Mochizuki：“AgI 中的堆垛层错和激子”Physica B. Vol。

<S. Mochizuki>_____________-, Y. Suzuki, T, Nakanishi and K. Ishi: "Valence-change and defect-induced white luminescence of Eu_2O_3"Physica B. Vol. 308-310. 1046-1049 (2001)

<S。

Shosuke MOCHIZUKI: "Valence-change And defect-induced white luminescence of Eu_2O_3"Physica B. 308-310. 1046-1049 (2001)

Shosuke Mochizuki：“Eu_2O_3 的价态变化和缺陷诱导的白色发光”Physica B. 308-310。