相关实验视频
Updated: Jun 24, 2025

07:03
Low-energy Cathodoluminescence for OxyNitride Phosphors
Published on: November 15, 2016
10.7K
全面评估NIR发射Nd3+激活酸盐玻璃:一个结构-属性关系研究研究
1Department of Biochemistry, Chemistry, and Physics, Georgia Southern University, Statesboro, Georgia 30460, United States.
ACS organic & inorganic Au
|June 10, 2024
概括
这项研究研究了用于光学应用的 (Nd3+) 合酸盐玻璃. 增加3+度会增强玻璃的性能,但由于离子-离子相互作用导致发光火.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 光学材料 光学材料
背景情况:
- (Nd3+) 合酸盐玻璃对于近红外 (NIR) 激光器和太阳光谱转换器至关重要.
- 了解成分,结构和特性之间的关系对于优化这些玻璃材料至关重要.
研究的目的:
- 为了合成和表征含有3+酸盐的酸盐玻璃,其度不同.
- 调查3+结合对玻璃的物理,结构,热,光学和光发光特性的影响.
主要方法:
- 通过化的玻璃合成:50P2O5-(50 - x) BaO-xNd2O3 (x = 04.0 mol %). 玻璃的合成方法是:
- 综合性表征包括密度,X射线衍射 (XRD),拉曼光谱,X射线光电子光谱 (XPS),微分扫描热度计 (DSC),扩散度计,UV对NIR吸收和光发光 (PL) 光谱.
主要成果:
- 增加的Nd2O3度导致了更高的密度,摩尔体积,玻璃过渡温度和软化温度,同时降低了热膨胀系数.
- XRD证实了无形结构;拉曼和XPS表明了玻璃脱聚合和增加了非桥接氧气,含有更高的Nd3+含量.
- Nd3+的吸收量随着度的增加而增加,但NIR发射强度达到1.0mol%的 Nd2O3的峰值,随后由于发光灭而下降.
结论:
- 3+离子作为网络修饰剂,诱导脱聚合,并在酸盐玻璃结构中产生强化作用.
- 对于NIR发射的最佳Nd3+度约为1.0mol%,超过该值,离子-离子相互作用会导致显著的发光灭.
相关概念视频
Variables Affecting Phosphorescence and Fluorescence
497
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...
497
Photoluminescence: Fluorescence and Phosphorescence
2.0K
Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
A pair of electrons in a...
2.0K
Photoluminescence: Applications
387
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...
387
Other Nuclides: 31P, 19F, 15N NMR
376
Many organic, inorganic, and biological molecules contain spin-half nuclei such as nitrogen-15, fluorine-19, and phosphorus-31. As a result, NMR studies of these nuclei have found extensive applications in chemical and biological research.
While fluorine-19 and phosphorous-31 have high natural abundances (100%) and positive gyromagnetic ratios, nitrogen-15 has a low natural abundance and a negative gyromagnetic ratio. However, nitrogen-15 is still preferred over nitrogen-14 (which has a...
While fluorine-19 and phosphorous-31 have high natural abundances (100%) and positive gyromagnetic ratios, nitrogen-15 has a low natural abundance and a negative gyromagnetic ratio. However, nitrogen-15 is still preferred over nitrogen-14 (which has a...
376
Fluorescence and Phosphorescence: Instrumentation
578
Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.
578

