形态化对LaAlO3:Pr3+材料的发光和UVC上转效率的影响
N Miniajluk-Gaweł1, A Chudzyńska1,2, B Bondzior1
1Institute of Low Temperature and Structure Research, Polish Academy of Science, Okólna 2, 50-422 Wroclaw, Poland. n.miniajluk@intibs.pl.
Dalton transactions (Cambridge, England : 2003)
|July 23, 2025
概括
晶体LaAlO3:Pr3+与无形形式相比,显示了增强的向上转换效率. 结构上的差异显著影响光学特性,指导先进的光子和光电子设备的设计.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 光子学 是一个光子学.
背景情况:
- 添加了 Praseodymium (Pr3+) 离子的兰酸盐 (LaAlO3) 是光学应用的有希望的材料.
- 了解结构相 (晶相与无形相) 对其发光特性的影响,对于材料设计至关重要.
研究的目的:
- 为了比较研究晶体和无形LaAlO3:Pr3+的光学特性.
- 探索结构转变对可见到紫外线上升转换发光效应的影响.
- 为开发新型光学设备提供见解.
主要方法:
- 通过固态反应合成多晶LaAlO3:Pr3+.
- 使用空气动力浮动和CO2激光加热转化为无形形态.
- 使用X射线衍射 (XRD),扫描电子显微镜 (SEM) 和能量分散式X射线光谱 (EDS) 的结构特征.
- 光谱分析包括辐射,激发和衰变时间测量.
主要成果:
- 在晶体和无形LaAlO3:Pr3+之间观察到明确的发光行为差异.
- 在444nm激发下,在晶相中检测到可见到紫外线的更高的上转换效率.
- XRD,SEM和EDS证实了合成阶段之间的结构差异.
结论:
- 当地的结构环境极大地影响了Pr3+合材料的光子特性.
- 晶体LaAlO3:Pr3+与无形对应物相比,具有优越的向上转换性能.
- 这些发现对于设计用于光子学,光电子和基于紫外线的技术的先进光学设备具有价值.
相关概念视频
Photoluminescence: Fluorescence and Phosphorescence
2.3K
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...
2.3K
Photoluminescence: Applications
482
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...
482
Variables Affecting Phosphorescence and Fluorescence
588
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...
588
Deactivation Processes: Jablonski Diagram
875
Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
875


