相关实验视频
Updated: Jan 8, 2026

07:03
Low-energy Cathodoluminescence for OxyNitride Phosphors
Published on: November 15, 2016
11.1K
介质问题:模拟LaPO4:Eu3+纳米粒子的发光光谱和辐射衰变
Daiwen Xiao1, Ka-Leung Wong1, Peter A Tanner1
1Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong S.A.R., P.R. China. klgwong@polyu.edu.hk.
Nanoscale
|December 22, 2025
概括
酸:欧纳米粒子 (LaPO4:Eu3+ NPs) 的光谱特性可以通过在各种介质中分散它们来调整. 它们的光学行为取决于周围的材料.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 发光的光度是非常的低.
背景情况:
- 描述不同环境中的纳米粒子行为需要适当的模型,但实验证据存在矛盾.
- 兰酸:欧 (LaPO4:Eu3+) 纳米粒子被研究其光学特性.
研究的目的:
- 研究不同的环境如何影响LaPO4:Eu3+纳米粒子的光谱特性.
- 为了确定折射率和化学环境对纳米粒子发光的影响.
主要方法:
- 在有机溶剂中分散LaPO4:Eu3+纳米颗粒,压制成玻璃盘,在玻璃中化,并制备玻璃中的 (PiG) 陶.
- 分析发射光谱,衰变寿命,电二极管 (ED) 与磁二极管 (MD) 的强度比.
- 将实验数据与模型参数相匹配,作为周围材料折射率的函数.
主要成果:
- 在酒精中,纳米粒子参数与折射率变化相关.
- 在压缩磁盘中,纳米粒子的光谱特性基本保持不变.
- 在PiG材料中,ED:MD强度比受到周围玻璃的折射率和化学亲和力 (离子共价性) 的影响.
- 在化玻璃中,LaPO4:Eu3+结构被破坏,Eu3+被纳入玻璃框架.
结论:
- 拉波4:欧3+纳米颗粒的光谱特性是多功能和可根据它们的分散介质调节的.
- 折射率和周围矩阵的化学性质都显著影响了纳米粒子发光.
- 了解这些相互作用对于设计具有特定光学功能的材料至关重要.
相关概念视频
Photoluminescence: Fluorescence and Phosphorescence
3.4K
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...
3.4K
Photoluminescence: Applications
965
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...
965
Variables Affecting Phosphorescence and Fluorescence
1.2K
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...
1.2K
Fluorescence and Phosphorescence: Instrumentation
1.4K
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.
1.4K

