相关实验视频
Updated: Jul 14, 2026

10:18
Blue-hazard-free Candlelight OLED
Published on: March 19, 2017
光三价在被和修改的二氧化宿主玻璃中的稳定性
Carmen Canevali1, Mariachiara Mattoni, Franca Morazzoni
1Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, INSTM, via Cozzi 53, 20125 Milano, Italy.
Journal of the American Chemical Society
|October 20, 2005
概括
添加的酸和酸玻璃表现出增强的光发光因稳定了Ce3+) 离子. 这种效应归因于与基的相互作用,防止氧化和聚合.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 发光的光度是非常的低.
背景情况:
- 稀土合眼镜对于光学应用至关重要.
- 控制像 (Ce) 这样的稀土离子的氧化状态是优化发光特性的关键.
- 酸,酸和酸玻璃为剂提供不同的宿主矩阵.
研究的目的:
- 研究不同玻璃基质 (玻璃酸盐,酸盐,玻璃酸盐) 对离子的行为和发光的影响.
- 了解离子和玻璃网络结构之间的相互作用.
- 为了将Ce(3+) 氧化状态的稳定与增强的光发光的相关性.
主要方法:
- 玻璃制备的索尔凝方法.
- 高分辨率传输电子显微镜 (HRTEM) 用于结构分析.
- 核磁共振 (NMR) 光谱学 ((31) P, (29) Si, (11) B MAS NMR) 用于探测当地环境.
- 电子磁共振 (EPR) 和紫外线吸收光谱法用于确定氧化状态和电子转换.
主要成果:
- 在基酸盐 (PSG) 和基酸盐 (BPSG) 玻璃中,Ce3+) 离子与酸盐群相互作用,抑制CeO2分离和Ce3+) 到Ce4+) 氧化,达到Ce:Si摩尔比为5 x 10−3.
- 在酸 (BSG) 玻璃中,与单位不协调,即使在低度下,也会导致Ce3+) 氧化,类似于纯玻璃 (SG).
- 与BSG和SG相比,在PSG和BPSG中观察到增强的光发光强度,这归因于同质的分散和稳定的Ce3+) 氧化状态.
结论:
- 酸盐和酸盐玻璃网有效稳定了Ce3+) 离子,促进了均的分散,并防止了氧化.
- 3+) 与酸盐组的相互作用对于增强这些玻璃系统中的光发光度至关重要.
- 由于缺乏特定的离子矩阵相互作用,BSG玻璃在光应用中稳定Ce(3+) 的效率低于PSG和BPSG.
相关概念视频
Noble Gases
The elements in group 18 are noble gases (helium, neon, argon, krypton, xenon, and radon). They earned the name “noble” because they were assumed to be nonreactive since they have filled valence shells. In 1962, Dr. Neil Bartlett at the University of British Columbia proved this assumption to be false.
Stability of Equilibrium Configuration
Understanding the stability of equilibrium configurations is a fundamental part of mechanical engineering. In any system, there are three distinct types of equilibrium: stable, neutral, and unstable.
A stable equilibrium occurs when a system tends to return to its original position when given a small displacement, and the potential energy is at its minimum. An example of a stable equilibrium is when a cantilever beam is fixed at one end and a weight is attached to the other end. If the weight...
A stable equilibrium occurs when a system tends to return to its original position when given a small displacement, and the potential energy is at its minimum. An example of a stable equilibrium is when a cantilever beam is fixed at one end and a weight is attached to the other end. If the weight...
Variables Affecting Phosphorescence and Fluorescence
Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
Photoluminescence: Applications
Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
Lattice Energies of Ionic Crystals
Lattice energy represents the energy released when gaseous cations and anions combine to form an ionic solid, reflecting the strength of electrostatic interactions within the crystal. This process is fundamentally governed by Coulombic attraction between oppositely charged ions, where the potential energy varies inversely with the interionic distance and directly with the product of ionic charges. As ions approach one another, the electrostatic energy becomes increasingly negative, indicating a...
Imperfections in Crystal Structure: Stoichiometric Point Defects
Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...

